Sigma rules for CVE-2021-34473
200 rules · scoped to cve · back to CVE-2021-34473
Direct rules mention this entity in their title or description. Related rules cover the techniques this entity is known to use.
title: Application URI Configuration Changes
id: 0055ad1f-be85-4798-83cf-a6da17c993b3
status: test
description: |
Detects when a configuration change is made to an applications URI.
URIs for domain names that no longer exist (dangling URIs), not using HTTPS, wildcards at the end of the domain, URIs that are no unique to that app, or URIs that point to domains you do not control should be investigated.
references:
- https://learn.microsoft.com/en-us/entra/architecture/security-operations-applications#application-configuration-changes
author: Mark Morowczynski '@markmorow', Bailey Bercik '@baileybercik'
date: 2022-06-02
tags:
- attack.initial-access
- attack.stealth
- attack.t1528
- attack.t1078.004
- attack.persistence
- attack.credential-access
- attack.privilege-escalation
logsource:
product: azure
service: auditlogs
detection:
selection:
properties.message: Update Application Sucess- Property Name AppAddress
condition: selection
falsepositives:
- When and administrator is making legitimate URI configuration changes to an application. This should be a planned event.
level: high
title: PIM Approvals And Deny Elevation
id: 039a7469-0296-4450-84c0-f6966b16dc6d
status: test
description: Detects when a PIM elevation is approved or denied. Outside of normal operations should be investigated.
references:
- https://learn.microsoft.com/en-us/entra/architecture/security-operations-privileged-identity-management#azure-ad-roles-assignment
author: Mark Morowczynski '@markmorow', Yochana Henderson, '@Yochana-H'
date: 2022-08-09
tags:
- attack.persistence
- attack.initial-access
- attack.privilege-escalation
- attack.stealth
- attack.t1078.004
logsource:
product: azure
service: auditlogs
detection:
selection:
properties.message: Request Approved/Denied
condition: selection
falsepositives:
- Actual admin using PIM.
level: high
title: Delegated Permissions Granted For All Users
id: a6355fbe-f36f-45d8-8efc-ab42465cbc52
status: test
description: Detects when highly privileged delegated permissions are granted on behalf of all users
references:
- https://learn.microsoft.com/en-us/entra/architecture/security-operations-applications#application-granted-highly-privileged-permissions
author: Bailey Bercik '@baileybercik', Mark Morowczynski '@markmorow'
date: 2022-07-28
tags:
- attack.credential-access
- attack.t1528
logsource:
product: azure
service: auditlogs
detection:
selection:
properties.message: Add delegated permission grant
condition: selection
falsepositives:
- When the permission is legitimately needed for the app
level: high
title: App Granted Microsoft Permissions
id: c1d147ae-a951-48e5-8b41-dcd0170c7213
status: test
description: Detects when an application is granted delegated or app role permissions for Microsoft Graph, Exchange, Sharepoint, or Azure AD
references:
- https://learn.microsoft.com/en-us/entra/architecture/security-operations-applications#application-granted-highly-privileged-permissions
author: Bailey Bercik '@baileybercik', Mark Morowczynski '@markmorow'
date: 2022-07-10
tags:
- attack.credential-access
- attack.t1528
logsource:
product: azure
service: auditlogs
detection:
selection:
properties.message:
- Add delegated permission grant
- Add app role assignment to service principal
condition: selection
falsepositives:
- When the permission is legitimately needed for the app
level: high
title: Bulk Deletion Changes To Privileged Account Permissions
id: 102e11e3-2db5-4c9e-bc26-357d42585d21
status: test
description: Detects when a user is removed from a privileged role. Bulk changes should be investigated.
references:
- https://learn.microsoft.com/en-us/entra/architecture/security-operations-privileged-identity-management#azure-ad-roles-assignment
author: Mark Morowczynski '@markmorow', Yochana Henderson, '@Yochana-H'
date: 2022-08-05
tags:
- attack.privilege-escalation
- attack.persistence
- attack.t1098
logsource:
product: azure
service: auditlogs
detection:
selection:
properties.message:
- Remove eligible member (permanent)
- Remove eligible member (eligible)
condition: selection
falsepositives:
- Legtimate administrator actions of removing members from a role
level: high
title: Temporary Access Pass Added To An Account
id: fa84aaf5-8142-43cd-9ec2-78cfebf878ce
status: test
description: Detects when a temporary access pass (TAP) is added to an account. TAPs added to priv accounts should be investigated
references:
- https://learn.microsoft.com/en-us/entra/architecture/security-operations-privileged-accounts#changes-to-privileged-accounts
author: Mark Morowczynski '@markmorow', Yochana Henderson, '@Yochana-H'
date: 2022-08-10
tags:
- attack.privilege-escalation
- attack.initial-access
- attack.persistence
- attack.stealth
- attack.t1078.004
logsource:
product: azure
service: auditlogs
detection:
selection:
properties.message: Admin registered security info
Status: Admin registered temporary access pass method for user
condition: selection
falsepositives:
- Administrator adding a legitimate temporary access pass
level: high
title: Changes to Device Registration Policy
id: 9494bff8-959f-4440-bbce-fb87a208d517
status: test
description: Monitor and alert for changes to the device registration policy.
references:
- https://learn.microsoft.com/en-us/entra/architecture/security-operations-devices#device-registrations-and-joins-outside-policy
author: Michael Epping, '@mepples21'
date: 2022-06-28
tags:
- attack.privilege-escalation
- attack.defense-impairment
- attack.t1484
logsource:
product: azure
service: auditlogs
detection:
selection:
Category: 'Policy'
ActivityDisplayName: 'Set device registration policies'
condition: selection
falsepositives:
- Unknown
level: high
title: User Added To Privilege Role
id: 49a268a4-72f4-4e38-8a7b-885be690c5b5
status: test
description: Detects when a user is added to a privileged role.
references:
- https://learn.microsoft.com/en-us/entra/architecture/security-operations-privileged-identity-management#azure-ad-roles-assignment
author: Mark Morowczynski '@markmorow', Yochana Henderson, '@Yochana-H'
date: 2022-08-06
tags:
- attack.persistence
- attack.initial-access
- attack.privilege-escalation
- attack.stealth
- attack.t1078.004
logsource:
product: azure
service: auditlogs
detection:
selection:
properties.message:
- Add eligible member (permanent)
- Add eligible member (eligible)
condition: selection
falsepositives:
- Legtimate administrator actions of adding members from a role
level: high
title: PIM Alert Setting Changes To Disabled
id: aeaef14c-e5bf-4690-a9c8-835caad458bd
status: test
description: Detects when PIM alerts are set to disabled.
references:
- https://learn.microsoft.com/en-us/entra/architecture/security-operations-privileged-identity-management#azure-ad-roles-assignment
author: Mark Morowczynski '@markmorow', Yochana Henderson, '@Yochana-H'
date: 2022-08-09
tags:
- attack.initial-access
- attack.persistence
- attack.privilege-escalation
- attack.stealth
- attack.t1078
logsource:
product: azure
service: auditlogs
detection:
selection:
properties.message: Disable PIM Alert
condition: selection
falsepositives:
- Administrator disabling PIM alerts as an active choice.
level: high
title: Added Credentials to Existing Application
id: cbb67ecc-fb70-4467-9350-c910bdf7c628
status: test
description: Detects when a new credential is added to an existing application. Any additional credentials added outside of expected processes could be a malicious actor using those credentials.
references:
- https://learn.microsoft.com/en-us/entra/architecture/security-operations-applications#application-credentials
author: Mark Morowczynski '@markmorow', Bailey Bercik '@baileybercik'
date: 2022-05-26
modified: 2025-07-18
tags:
- attack.privilege-escalation
- attack.t1098.001
- attack.persistence
logsource:
product: azure
service: auditlogs
detection:
selection:
properties.message:
- Update application – Certificates and secrets management
- Update Service principal/Update Application
condition: selection
falsepositives:
- When credentials are added/removed as part of the normal working hours/workflows
level: high
title: Azure Subscription Permission Elevation Via AuditLogs
id: ca9bf243-465e-494a-9e54-bf9fc239057d
status: test
description: |
Detects when a user has been elevated to manage all Azure Subscriptions.
This change should be investigated immediately if it isn't planned.
This setting could allow an attacker access to Azure subscriptions in your environment.
references:
- https://learn.microsoft.com/en-us/entra/architecture/security-operations-privileged-accounts#assignment-and-elevation
author: Austin Songer @austinsonger
date: 2021-11-26
modified: 2022-12-25
tags:
- attack.privilege-escalation
- attack.persistence
- attack.initial-access
- attack.stealth
- attack.t1078
logsource:
product: azure
service: auditlogs
detection:
selection:
Category: 'Administrative'
OperationName: 'Assigns the caller to user access admin'
condition: selection
falsepositives:
- If this was approved by System Administrator.
level: high
title: Users Added to Global or Device Admin Roles
id: 11c767ae-500b-423b-bae3-b234450736ed
status: test
description: Monitor and alert for users added to device admin roles.
references:
- https://learn.microsoft.com/en-us/entra/architecture/security-operations-devices#device-administrator-roles
author: Michael Epping, '@mepples21'
date: 2022-06-28
tags:
- attack.persistence
- attack.initial-access
- attack.privilege-escalation
- attack.stealth
- attack.t1078.004
logsource:
product: azure
service: auditlogs
detection:
selection:
Category: RoleManagement
OperationName|contains|all:
- 'Add'
- 'member to role'
TargetResources|contains:
- '7698a772-787b-4ac8-901f-60d6b08affd2'
- '62e90394-69f5-4237-9190-012177145e10'
condition: selection
falsepositives:
- Unknown
level: high
title: Application AppID Uri Configuration Changes
id: 1b45b0d1-773f-4f23-aedc-814b759563b1
status: test
description: Detects when a configuration change is made to an applications AppID URI.
references:
- https://learn.microsoft.com/en-us/entra/architecture/security-operations-applications#appid-uri-added-modified-or-removed
author: Mark Morowczynski '@markmorow', Bailey Bercik '@baileybercik'
date: 2022-06-02
tags:
- attack.initial-access
- attack.persistence
- attack.credential-access
- attack.privilege-escalation
- attack.stealth
- attack.t1552
- attack.t1078.004
logsource:
product: azure
service: auditlogs
detection:
selection:
properties.message:
- Update Application
- Update Service principal
condition: selection
falsepositives:
- When and administrator is making legitimate AppID URI configuration changes to an application. This should be a planned event.
level: high
title: Account Created And Deleted Within A Close Time Frame
id: 6f583da0-3a90-4566-a4ed-83c09fe18bbf
status: test
description: Detects when an account was created and deleted in a short period of time.
references:
- https://learn.microsoft.com/en-us/entra/architecture/security-operations-user-accounts#short-lived-accounts
author: Mark Morowczynski '@markmorow', MikeDuddington, '@dudders1', Tim Shelton
date: 2022-08-11
modified: 2022-08-18
tags:
- attack.privilege-escalation
- attack.persistence
- attack.initial-access
- attack.stealth
- attack.t1078
logsource:
product: azure
service: auditlogs
detection:
selection:
properties.message:
- Add user
- Delete user
Status: Success
condition: selection
falsepositives:
- Legit administrative action
level: high
title: Changes To PIM Settings
id: db6c06c4-bf3b-421c-aa88-15672b88c743
status: test
description: Detects when changes are made to PIM roles
references:
- https://learn.microsoft.com/en-us/entra/architecture/security-operations-privileged-identity-management#azure-ad-roles-assignment
author: Mark Morowczynski '@markmorow', Yochana Henderson, '@Yochana-H'
date: 2022-08-09
tags:
- attack.initial-access
- attack.privilege-escalation
- attack.persistence
- attack.stealth
- attack.t1078.004
logsource:
product: azure
service: auditlogs
detection:
selection:
properties.message: Update role setting in PIM
condition: selection
falsepositives:
- Legit administrative PIM setting configuration changes
level: high
title: Windows LAPS Credential Dump From Entra ID
id: a4b25073-8947-489c-a8dd-93b41c23f26d
status: test
description: Detects when an account dumps the LAPS password from Entra ID.
references:
- https://twitter.com/NathanMcNulty/status/1785051227568632263
- https://www.cloudcoffee.ch/microsoft-365/configure-windows-laps-in-microsoft-intune/
- https://techcommunity.microsoft.com/t5/microsoft-entra-blog/introducing-windows-local-administrator-password-solution-with/ba-p/1942487
author: andrewdanis
date: 2024-06-26
tags:
- attack.privilege-escalation
- attack.persistence
- attack.t1098.005
logsource:
product: azure
service: auditlogs
detection:
selection:
category: 'Device'
activityType|contains: 'Recover device local administrator password'
additionalDetails.additionalInfo|contains: 'Successfully recovered local credential by device id'
condition: selection
falsepositives:
- Approved activity performed by an Administrator.
level: high
title: Azure Subscription Permission Elevation Via ActivityLogs
id: 09438caa-07b1-4870-8405-1dbafe3dad95
status: test
description: |
Detects when a user has been elevated to manage all Azure Subscriptions.
This change should be investigated immediately if it isn't planned.
This setting could allow an attacker access to Azure subscriptions in your environment.
references:
- https://learn.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations#microsoftauthorization
author: Austin Songer @austinsonger
date: 2021-11-26
modified: 2022-08-23
tags:
- attack.privilege-escalation
- attack.persistence
- attack.initial-access
- attack.stealth
- attack.t1078.004
logsource:
product: azure
service: activitylogs
detection:
selection:
operationName: MICROSOFT.AUTHORIZATION/ELEVATEACCESS/ACTION
condition: selection
falsepositives:
- If this was approved by System Administrator.
level: high
title: Disabling Multi Factor Authentication
id: 60de9b57-dc4d-48b9-a6a0-b39e0469f876
status: test
description: Detects disabling of Multi Factor Authentication.
references:
- https://research.splunk.com/cloud/c783dd98-c703-4252-9e8a-f19d9f5c949e/
author: Splunk Threat Research Team (original rule), Harjot Singh @cyb3rjy0t (sigma rule)
date: 2023-09-18
tags:
- attack.persistence
- attack.credential-access
- attack.defense-impairment
- attack.t1556.006
logsource:
service: audit
product: m365
detection:
selection:
Operation|contains: 'Disable Strong Authentication.'
condition: selection
falsepositives:
- Unlikely
level: high
title: Azure Login Bypassing Conditional Access Policies
id: 13f2d3f5-6497-44a7-bf5f-dc13ffafe5dc
status: experimental
description: |
Detects a successful login to the Microsoft Intune Company Portal which could allow bypassing Conditional Access Policies and InTune device trust using a tool like TokenSmith.
author: Josh Nickels, Marius Rothenbücher
references:
- https://labs.jumpsec.com/tokensmith-bypassing-intune-compliant-device-conditional-access/
- https://github.com/JumpsecLabs/TokenSmith
date: 2025-01-08
tags:
- attack.privilege-escalation
- attack.persistence
- attack.initial-access
- attack.stealth
- attack.t1078
logsource:
service: audit
product: m365
detection:
selection:
Operation: 'UserLoggedIn'
ApplicationId: '9ba1a5c7-f17a-4de9-a1f1-6178c8d51223'
ResultStatus: 'Success'
RequestType: 'Cmsi:Cmsi'
filter_main_bjectid:
ObjectId: '0000000a-0000-0000-c000-000000000000' # Microsoft Intune seen when mobile devices are enrolled
condition: selection and not 1 of filter_main_*
falsepositives:
- Unknown
level: high
title: Antivirus Web Shell Detection
id: fdf135a2-9241-4f96-a114-bb404948f736
status: test
description: |
Detects a highly relevant Antivirus alert that reports a web shell.
It's highly recommended to tune this rule to the specific strings used by your anti virus solution by downloading a big WebShell repository from e.g. github and checking the matches.
This event must not be ignored just because the AV has blocked the malware but investigate, how it came there in the first place.
references:
- https://www.nextron-systems.com/?s=antivirus
- https://github.com/tennc/webshell
- https://www.virustotal.com/gui/file/bd1d52289203866645e556e2766a21d2275877fbafa056a76fe0cf884b7f8819/detection
- https://www.virustotal.com/gui/file/308487ed28a3d9abc1fec7ebc812d4b5c07ab025037535421f64c60d3887a3e8/detection
- https://www.virustotal.com/gui/file/7d3cb8a8ff28f82b07f382789247329ad2d7782a72dde9867941f13266310c80/detection
- https://www.virustotal.com/gui/file/e841675a4b82250c75273ebf0861245f80c6a1c3d5803c2d995d9d3b18d5c4b5/detection
- https://www.virustotal.com/gui/file/a80042c61a0372eaa0c2c1e831adf0d13ef09feaf71d1d20b216156269045801/detection
- https://www.virustotal.com/gui/file/b219f7d3c26f8bad7e175934cd5eda4ddb5e3983503e94ff07d39c0666821b7e/detection
- https://www.virustotal.com/gui/file/b8702acf32fd651af9f809ed42d15135f842788cd98d81a8e1b154ee2a2b76a2/detection
- https://www.virustotal.com/gui/file/13ae8bfbc02254b389ab052aba5e1ba169b16a399d9bc4cb7414c4a73cd7dc78/detection
author: Florian Roth (Nextron Systems), Arnim Rupp
date: 2018-09-09
modified: 2024-11-02
tags:
- attack.persistence
- attack.t1505.003
logsource:
category: antivirus
detection:
selection:
- Signature|startswith:
- 'ASP.'
- 'IIS/BackDoor'
- 'JAVA/Backdoor'
- 'JSP.'
- 'Perl.'
- 'PHP.'
- 'Troj/ASP'
- 'Troj/JSP'
- 'Troj/PHP'
- 'VBS/Uxor' # looking for 'VBS/' would also find downloader's and droppers meant for desktops
- Signature|contains:
- 'ASP_' # looking for 'VBS_' would also find downloader's and droppers meant for desktops
- 'ASP:'
- 'ASP.Agent'
- 'ASP/'
# - 'ASP/Agent'
- 'Aspdoor'
- 'ASPXSpy'
- 'Backdoor.ASP'
- 'Backdoor.Java'
- 'Backdoor.JSP'
- 'Backdoor.PHP'
- 'Backdoor.VBS'
- 'Backdoor/ASP'
- 'Backdoor/Java'
- 'Backdoor/JSP'
- 'Backdoor/PHP'
- 'Backdoor/VBS'
- 'C99shell'
- 'Chopper'
- 'filebrowser'
- 'JSP_'
- 'JSP:'
- 'JSP.Agent'
- 'JSP/'
# - 'JSP/Agent'
- 'Perl:'
- 'Perl/'
- 'PHP_'
- 'PHP:'
- 'PHP.Agent'
- 'PHP/'
# - 'PHP/Agent'
- 'PHPShell'
- 'PShlSpy'
- 'SinoChoper'
- 'Trojan.ASP'
- 'Trojan.JSP'
- 'Trojan.PHP'
- 'Trojan.VBS'
- 'VBS.Agent'
- 'VBS/Agent'
- 'Webshell'
condition: selection
falsepositives:
- Unlikely
level: high
title: Antivirus Relevant File Paths Alerts
id: c9a88268-0047-4824-ba6e-4d81ce0b907c
status: test
description: |
Detects an Antivirus alert in a highly relevant file path or with a relevant file name.
This event must not be ignored just because the AV has blocked the malware but investigate, how it came there in the first place.
references:
- https://www.nextron-systems.com/?s=antivirus
author: Florian Roth (Nextron Systems), Arnim Rupp
date: 2018-09-09
modified: 2024-11-02
tags:
- attack.resource-development
- attack.t1588
logsource:
category: antivirus
detection:
selection_path:
Filename|contains:
- ':\PerfLogs\'
- ':\Temp\'
- ':\Users\Default\'
- ':\Users\Public\'
- ':\Windows\'
- '/www/'
# - '\Client\'
- '\inetpub\'
- '\tsclient\'
- 'apache'
- 'nginx'
- 'tomcat'
- 'weblogic'
selection_ext:
Filename|endswith:
- '.asax'
- '.ashx'
- '.asmx'
- '.asp'
- '.aspx'
- '.bat'
- '.cfm'
- '.cgi'
- '.chm'
- '.cmd'
- '.dat'
- '.ear'
- '.gif'
- '.hta'
- '.jpeg'
- '.jpg'
- '.jsp'
- '.jspx'
- '.lnk'
- '.msc'
- '.php'
- '.pl'
- '.png'
- '.ps1'
- '.psm1'
- '.py'
- '.pyc'
- '.rb'
- '.scf'
- '.sct'
- '.sh'
- '.svg'
- '.txt'
- '.vbe'
- '.vbs'
- '.war'
- '.wll'
- '.wsf'
- '.wsh'
- '.xll'
- '.xml'
condition: 1 of selection_*
falsepositives:
- Unlikely
level: high
title: Antivirus Hacktool Detection
id: fa0c05b6-8ad3-468d-8231-c1cbccb64fba
status: stable
description: |
Detects a highly relevant Antivirus alert that reports a hack tool or other attack tool.
This event must not be ignored just because the AV has blocked the malware but investigate, how it came there in the first place.
references:
- https://www.nextron-systems.com/2021/08/16/antivirus-event-analysis-cheat-sheet-v1-8-2/
- https://www.nextron-systems.com/?s=antivirus
author: Florian Roth (Nextron Systems), Arnim Rupp
date: 2021-08-16
modified: 2024-11-02
tags:
- attack.execution
- attack.t1204
logsource:
category: antivirus
detection:
selection:
- Signature|startswith:
- 'ATK/' # Sophos
- 'Exploit.Script.CVE'
- 'HKTL'
- 'HTOOL'
- 'PWS.'
- 'PWSX'
- 'SecurityTool'
# - 'FRP.'
- Signature|contains:
- 'Adfind'
- 'Brutel'
- 'BruteR'
- 'Cobalt'
- 'COBEACON'
- 'Cometer'
- 'DumpCreds'
- 'FastReverseProxy'
- 'Hacktool'
- 'Havoc'
- 'Impacket'
- 'Keylogger'
- 'Koadic'
- 'Mimikatz'
- 'Nighthawk'
- 'PentestPowerShell'
- 'Potato'
- 'PowerSploit'
- 'PowerSSH'
- 'PshlSpy'
- 'PSWTool'
- 'PWCrack'
- 'PWDump'
- 'Rozena'
- 'Rusthound'
- 'Sbelt'
- 'Seatbelt'
- 'SecurityTool'
- 'SharpDump'
- 'SharpHound'
- 'Shellcode'
- 'Sliver'
- 'Snaffler'
- 'SOAPHound'
- 'Splinter'
- 'Swrort'
- 'TurtleLoader'
condition: selection
falsepositives:
- Unlikely
level: high
title: Communication To LocaltoNet Tunneling Service Initiated - Linux
id: c4568f5d-131f-4e78-83d4-45b2da0ec4f1
status: test
description: |
Detects an executable initiating a network connection to "LocaltoNet" tunneling sub-domains.
LocaltoNet is a reverse proxy that enables localhost services to be exposed to the Internet.
Attackers have been seen to use this service for command-and-control activities to bypass MFA and perimeter controls.
references:
- https://localtonet.com/documents/supported-tunnels
- https://cloud.google.com/blog/topics/threat-intelligence/unc3944-targets-saas-applications
author: Andreas Braathen (mnemonic.io)
date: 2024-06-17
tags:
- attack.command-and-control
- attack.t1572
- attack.t1090
- attack.t1102
logsource:
category: network_connection
product: linux
detection:
selection:
DestinationHostname|endswith:
- '.localto.net'
- '.localtonet.com'
Initiated: 'true'
condition: selection
falsepositives:
- Legitimate use of the LocaltoNet service.
level: high
title: Potentially Suspicious Malware Callback Communication - Linux
id: dbfc7c98-04ab-4ab7-aa94-c74d22aa7376
related:
- id: 4b89abaa-99fe-4232-afdd-8f9aa4d20382
type: derived
status: test
description: |
Detects programs that connect to known malware callback ports based on threat intelligence reports.
references:
- https://www.mandiant.com/resources/blog/triton-actor-ttp-profile-custom-attack-tools-detections
- https://www.mandiant.com/resources/blog/ukraine-and-sandworm-team
- https://www.elastic.co/guide/en/security/current/potential-non-standard-port-ssh-connection.html
- https://thehackernews.com/2024/01/systembc-malwares-c2-server-analysis.html
- https://www.cybereason.com/blog/sliver-c2-leveraged-by-many-threat-actors
author: hasselj
date: 2024-05-10
tags:
- attack.persistence
- attack.command-and-control
- attack.t1571
logsource:
category: network_connection
product: linux
detection:
selection:
Initiated: 'true'
DestinationPort:
- 888
- 999
- 2200
- 2222
- 4000
- 4444
- 6789
- 8531
- 50501
- 51820
filter_main_local_ranges:
DestinationIp|cidr:
- '127.0.0.0/8'
- '10.0.0.0/8'
- '172.16.0.0/12'
- '192.168.0.0/16'
- '169.254.0.0/16'
- '::1/128' # IPv6 loopback
- 'fe80::/10' # IPv6 link-local addresses
- 'fc00::/7' # IPv6 private addresses
condition: selection and not 1 of filter_main_*
falsepositives:
- Unknown
level: high
title: Communication To Ngrok Tunneling Service - Linux
id: 19bf6fdb-7721-4f3d-867f-53467f6a5db6
status: test
description: Detects an executable accessing an ngrok tunneling endpoint, which could be a sign of forbidden exfiltration of data exfiltration by malicious actors
references:
- https://twitter.com/hakluke/status/1587733971814977537/photo/1
- https://ngrok.com/docs/secure-tunnels/tunnels/ssh-reverse-tunnel-agent
author: Florian Roth (Nextron Systems)
date: 2022-11-03
tags:
- attack.exfiltration
- attack.command-and-control
- attack.t1567
- attack.t1568.002
- attack.t1572
- attack.t1090
- attack.t1102
- attack.s0508
logsource:
product: linux
category: network_connection
detection:
selection:
DestinationHostname|contains:
- 'tunnel.us.ngrok.com'
- 'tunnel.eu.ngrok.com'
- 'tunnel.ap.ngrok.com'
- 'tunnel.au.ngrok.com'
- 'tunnel.sa.ngrok.com'
- 'tunnel.jp.ngrok.com'
- 'tunnel.in.ngrok.com'
condition: selection
falsepositives:
- Legitimate use of ngrok
level: high
title: Shell Execution GCC - Linux
id: 9b5de532-a757-4d70-946c-1f3e44f48b4d
status: test
description: |
Detects the use of the "gcc" utility to execute a shell. Such behavior may be associated with privilege escalation, unauthorized command execution, or to break out from restricted environments.
references:
- https://gtfobins.github.io/gtfobins/gcc/#shell
- https://gtfobins.github.io/gtfobins/c89/#shell
- https://gtfobins.github.io/gtfobins/c99/#shell
- https://www.elastic.co/guide/en/security/current/linux-restricted-shell-breakout-via-linux-binary-s.html
author: Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.)
date: 2024-09-02
tags:
- attack.discovery
- attack.t1083
logsource:
category: process_creation
product: linux
detection:
selection_img:
Image|endswith:
- '/c89'
- '/c99'
- '/gcc'
CommandLine|contains: '-wrapper'
selection_cli:
CommandLine|contains:
- '/bin/bash,-s'
- '/bin/dash,-s'
- '/bin/fish,-s'
- '/bin/sh,-s'
- '/bin/zsh,-s'
condition: all of selection_*
falsepositives:
- Unknown
level: high
title: Shell Execution via Rsync - Linux
id: e2326866-609f-4015-aea9-7ec634e8aa04
status: experimental
description: |
Detects the use of the "rsync" utility to execute a shell. Such behavior may be associated with privilege escalation, unauthorized command execution, or to break out from restricted environments.
references:
- https://gtfobins.github.io/gtfobins/rsync/#shell
author: Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.), Florian Roth
date: 2024-09-02
modified: 2025-01-18
tags:
- attack.execution
- attack.t1059
logsource:
category: process_creation
product: linux
detection:
selection_img:
Image|endswith:
- '/rsync'
- '/rsyncd'
CommandLine|contains: ' -e '
selection_cli:
CommandLine|contains:
- '/ash '
- '/bash '
- '/dash '
- '/csh '
- '/sh '
- '/zsh '
- '/tcsh '
- '/ksh '
- "'ash "
- "'bash "
- "'dash "
- "'csh "
- "'sh "
- "'zsh "
- "'tcsh "
- "'ksh "
condition: all of selection_*
falsepositives:
- Legitimate cases in which "rsync" is used to execute a shell
level: high
title: Shell Execution via Git - Linux
id: 47b3bbd4-1bf7-48cc-84ab-995362aaa75a
status: test
description: |
Detects the use of the "git" utility to execute a shell. Such behavior may be associated with privilege escalation, unauthorized command execution, or to break out from restricted environments.
references:
- https://gtfobins.github.io/gtfobins/git/#shell
author: Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.)
date: 2024-09-02
tags:
- attack.execution
- attack.t1059
logsource:
category: process_creation
product: linux
detection:
selection:
ParentImage|endswith: '/git'
ParentCommandLine|contains|all:
- ' -p '
- 'help'
CommandLine|contains:
- 'bash 0<&1'
- 'dash 0<&1'
- 'sh 0<&1'
condition: selection
falsepositives:
- Unknown
level: high
title: Suspicious Invocation of Shell via Rsync
id: 297241f3-8108-4b3a-8c15-2dda9f844594
status: experimental
description: |
Detects the execution of a shell as sub process of "rsync" without the expected command line flag "-e" being used, which could be an indication of exploitation as described in CVE-2024-12084. This behavior is commonly associated with attempts to execute arbitrary commands or escalate privileges, potentially leading to unauthorized access or further exploitation.
references:
- https://sysdig.com/blog/detecting-and-mitigating-cve-2024-12084-rsync-remote-code-execution/
- https://gist.github.com/Neo23x0/a20436375a1e26524931dd8ea1a3af10
author: Florian Roth
date: 2025-01-18
tags:
- attack.execution
- attack.t1059
- attack.t1203
logsource:
category: process_creation
product: linux
detection:
selection:
ParentImage|endswith:
- '/rsync'
- '/rsyncd'
Image|endswith:
- '/ash'
- '/bash'
- '/csh'
- '/dash'
- '/ksh'
- '/sh'
- '/tcsh'
- '/zsh'
filter_main_expected:
CommandLine|contains: ' -e '
condition: selection and not 1 of filter_main_*
falsepositives:
- Unknown
level: high
title: ESXi Admin Permission Assigned To Account Via ESXCLI
id: 9691f58d-92c1-4416-8bf3-2edd753ec9cf
status: test
description: Detects execution of the "esxcli" command with the "system" and "permission" flags in order to assign admin permissions to an account.
references:
- https://developer.broadcom.com/xapis/esxcli-command-reference/7.0.0/namespace/esxcli_system.html
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-09-04
tags:
- attack.persistence
- attack.execution
- attack.privilege-escalation
- attack.t1059.012
- attack.t1098
logsource:
category: process_creation
product: linux
detection:
selection:
Image|endswith: '/esxcli'
CommandLine|contains: 'system'
CommandLine|contains|all:
- ' permission '
- ' set'
- 'Admin'
condition: selection
falsepositives:
- Legitimate administration activities
level: high
title: Capsh Shell Invocation - Linux
id: db1ac3be-f606-4e3a-89e0-9607cbe6b98a
status: test
description: |
Detects the use of the "capsh" utility to invoke a shell.
references:
- https://gtfobins.github.io/gtfobins/capsh/#shell
- https://www.elastic.co/guide/en/security/current/linux-restricted-shell-breakout-via-linux-binary-s.html
author: Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.)
date: 2024-09-02
tags:
- attack.execution
- attack.t1059
logsource:
category: process_creation
product: linux
detection:
selection:
Image|endswith: '/capsh'
CommandLine|endswith: ' --'
condition: selection
falsepositives:
- Unknown
level: high
title: Inline Python Execution - Spawn Shell Via OS System Library
id: 2d2f44ff-4611-4778-a8fc-323a0e9850cc
status: test
description: |
Detects execution of inline Python code via the "-c" in order to call the "system" function from the "os" library, and spawn a shell.
references:
- https://gtfobins.github.io/gtfobins/python/#shell
author: Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.)
date: 2024-09-02
tags:
- attack.execution
- attack.t1059
logsource:
category: process_creation
product: linux
detection:
selection_img:
- Image|endswith:
- '/python'
- '/python2'
- '/python3'
- Image|contains:
- '/python2.' # python image is always of the form ../python3.10; ../python is just a symlink
- '/python3.'
selection_cli:
CommandLine|contains|all:
- ' -c '
- 'os.system('
CommandLine|contains:
- '/bin/bash'
- '/bin/dash'
- '/bin/fish'
- '/bin/sh'
- '/bin/zsh'
condition: all of selection_*
falsepositives:
- Unknown
level: high
title: Potential Netcat Reverse Shell Execution
id: 7f734ed0-4f47-46c0-837f-6ee62505abd9
status: test
description: Detects execution of netcat with the "-e" flag followed by common shells. This could be a sign of a potential reverse shell setup.
references:
- https://pentestmonkey.net/cheat-sheet/shells/reverse-shell-cheat-sheet
- https://www.revshells.com/
- https://www.hackingtutorials.org/networking/hacking-netcat-part-2-bind-reverse-shells/
- https://www.infosecademy.com/netcat-reverse-shells/
- https://man7.org/linux/man-pages/man1/ncat.1.html
author: '@d4ns4n_, Nasreddine Bencherchali (Nextron Systems)'
date: 2023-04-07
tags:
- attack.execution
- attack.t1059
logsource:
category: process_creation
product: linux
detection:
selection_nc:
Image|endswith:
- '/nc'
- '/ncat'
selection_flags:
CommandLine|contains:
- ' -c '
- ' -e '
selection_shell:
CommandLine|contains:
- ' ash'
- ' bash'
- ' bsh'
- ' csh'
- ' ksh'
- ' pdksh'
- ' sh'
- ' tcsh'
- '/bin/ash'
- '/bin/bash'
- '/bin/bsh'
- '/bin/csh'
- '/bin/ksh'
- '/bin/pdksh'
- '/bin/sh'
- '/bin/tcsh'
- '/bin/zsh'
- '$IFSash'
- '$IFSbash'
- '$IFSbsh'
- '$IFScsh'
- '$IFSksh'
- '$IFSpdksh'
- '$IFSsh'
- '$IFStcsh'
- '$IFSzsh'
condition: all of selection_*
falsepositives:
- Unlikely
level: high
title: Shell Execution via Find - Linux
id: 6adfbf8f-52be-4444-9bac-81b539624146
status: test
description: |
Detects the use of the find command to execute a shell. Such behavior may be associated with privilege escalation, unauthorized command execution, or exploitation attempt.
references:
- https://gtfobins.github.io/gtfobins/find/#shell
- https://www.elastic.co/guide/en/security/current/linux-restricted-shell-breakout-via-linux-binary-s.html
author: Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.)
date: 2024-09-02
tags:
- attack.discovery
- attack.t1083
logsource:
category: process_creation
product: linux
detection:
selection_img:
Image|endswith: '/find'
CommandLine|contains|all:
- ' . '
- '-exec'
selection_cli:
CommandLine|contains:
- '/bin/bash'
- '/bin/dash'
- '/bin/fish'
- '/bin/sh'
- '/bin/zsh'
condition: all of selection_*
falsepositives:
- Unknown
level: high
title: History File Deletion
id: 1182f3b3-e716-4efa-99ab-d2685d04360f
status: test
description: Detects events in which a history file gets deleted, e.g. the ~/bash_history to remove traces of malicious activity
references:
- https://github.com/sleventyeleven/linuxprivchecker/
- https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1552.003/T1552.003.md
author: Florian Roth (Nextron Systems)
date: 2022-06-20
modified: 2022-09-15
tags:
- attack.impact
- attack.t1565.001
logsource:
category: process_creation
product: linux
detection:
selection:
Image|endswith:
- '/rm'
- '/unlink'
- '/shred'
selection_history:
- CommandLine|contains:
- '/.bash_history'
- '/.zsh_history'
- CommandLine|endswith:
- '_history'
- '.history'
- 'zhistory'
condition: all of selection*
falsepositives:
- Legitimate administration activities
level: high
title: Copy Passwd Or Shadow From TMP Path
id: fa4aaed5-4fe0-498d-bbc0-08e3346387ba
status: test
description: Detects when the file "passwd" or "shadow" is copied from tmp path
references:
- https://blogs.blackberry.com/
- https://twitter.com/Joseliyo_Jstnk/status/1620131033474822144
author: Joseliyo Sanchez, @Joseliyo_Jstnk
date: 2023-01-31
tags:
- attack.credential-access
- attack.t1552.001
logsource:
product: linux
category: process_creation
detection:
selection_img:
Image|endswith: '/cp'
selection_path:
CommandLine|contains: '/tmp/'
selection_file:
CommandLine|contains:
- 'passwd'
- 'shadow'
condition: all of selection_*
falsepositives:
- Unknown
level: high
title: Potential GobRAT File Discovery Via Grep
id: e34cfa0c-0a50-4210-9cb3-5632d08eb041
status: test
description: Detects the use of grep to discover specific files created by the GobRAT malware
references:
- https://blogs.jpcert.or.jp/en/2023/05/gobrat.html
- https://www.virustotal.com/gui/file/60bcd645450e4c846238cf0e7226dc40c84c96eba99f6b2cffcd0ab4a391c8b3/detection
- https://www.virustotal.com/gui/file/3e44c807a25a56f4068b5b8186eee5002eed6f26d665a8b791c472ad154585d1/detection
author: Joseliyo Sanchez, @Joseliyo_Jstnk
date: 2023-06-02
tags:
- attack.discovery
- attack.t1082
logsource:
category: process_creation
product: linux
detection:
selection:
Image|endswith: '/grep'
CommandLine|contains:
- 'apached'
- 'frpc'
- 'sshd.sh'
- 'zone.arm'
condition: selection
falsepositives:
- Unknown
level: high
title: Triple Cross eBPF Rootkit Install Commands
id: 22236d75-d5a0-4287-bf06-c93b1770860f
status: test
description: Detects default install commands of the Triple Cross eBPF rootkit based on the "deployer.sh" script
references:
- https://github.com/h3xduck/TripleCross/blob/1f1c3e0958af8ad9f6ebe10ab442e75de33e91de/apps/deployer.sh
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-07-05
tags:
- attack.stealth
- attack.t1014
logsource:
category: process_creation
product: linux
detection:
selection:
Image|endswith: '/sudo'
CommandLine|contains|all:
- ' tc '
- ' enp0s3 '
CommandLine|contains:
- ' qdisc '
- ' filter '
condition: selection
falsepositives:
- Unlikely
level: high
title: OMIGOD SCX RunAsProvider ExecuteShellCommand
id: 21541900-27a9-4454-9c4c-3f0a4240344a
status: test
description: |
Rule to detect the use of the SCX RunAsProvider Invoke_ExecuteShellCommand to execute any UNIX/Linux command using the /bin/sh shell.
SCXcore, started as the Microsoft Operations Manager UNIX/Linux Agent, is now used in a host of products including
Microsoft Operations Manager, Microsoft Azure, and Microsoft Operations Management Suite.
references:
- https://www.wiz.io/blog/omigod-critical-vulnerabilities-in-omi-azure
- https://github.com/Azure/Azure-Sentinel/pull/3059
author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research), MSTIC
date: 2021-10-15
modified: 2022-10-05
tags:
- attack.privilege-escalation
- attack.initial-access
- attack.execution
- attack.t1068
- attack.t1190
- attack.t1203
logsource:
product: linux
category: process_creation
detection:
selection:
User: root
LogonId: 0
CurrentDirectory: '/var/opt/microsoft/scx/tmp'
CommandLine|contains: '/bin/sh'
condition: selection
falsepositives:
- Legitimate use of SCX RunAsProvider Invoke_ExecuteShellCommand.
level: high
title: Suspicious Download and Execute Pattern via Curl/Wget
id: a2d9e2f3-0f43-4c7a-bcd9-9acfc0d723aa
status: experimental
description: |
Detects suspicious use of command-line tools such as curl or wget to download remote
content - particularly scripts - into temporary directories (e.g., /dev/shm, /tmp), followed by
immediate execution, indicating potential malicious activity. This pattern is commonly used
by malicious scripts, stagers, or downloaders in fileless or multi-stage Linux attacks.
references:
- https://gtfobins.github.io/gtfobins/wget/
- https://gtfobins.github.io/gtfobins/curl/
author: Aayush Gupta
date: 2025-06-17
tags:
- attack.execution
- attack.t1059.004
- attack.t1203
logsource:
category: process_creation
product: linux
detection:
selection_downloader:
CommandLine|contains:
- '/curl'
- '/wget'
selection_tmp:
CommandLine|contains:
- '/tmp/'
- '/dev/shm/'
selection_executor:
CommandLine|contains: 'sh -c'
condition: all of selection_*
falsepositives:
- System update scripts using temporary files
- Installer scripts or automated provisioning tools
level: high
title: Shell Execution via Flock - Linux
id: 4b09c71e-4269-4111-9cdd-107d8867f0cc
status: test
description: |
Detects the use of the "flock" command to execute a shell. Such behavior may be associated with privilege escalation, unauthorized command execution, or to break out from restricted environments.
references:
- https://gtfobins.github.io/gtfobins/flock/#shell
- https://www.elastic.co/guide/en/security/current/linux-restricted-shell-breakout-via-linux-binary-s.html
author: Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.)
date: 2024-09-02
tags:
- attack.discovery
- attack.t1083
logsource:
category: process_creation
product: linux
detection:
selection_img:
Image|endswith: '/flock'
CommandLine|contains: ' -u '
selection_cli:
CommandLine|contains:
- '/bin/bash'
- '/bin/dash'
- '/bin/fish'
- '/bin/sh'
- '/bin/zsh'
condition: all of selection_*
falsepositives:
- Unknown
level: high
title: Suspicious Invocation of Shell via AWK - Linux
id: 8c1a5675-cb85-452f-a298-b01b22a51856
status: test
description: |
Detects the execution of "awk" or it's sibling commands, to invoke a shell using the system() function.
This behavior is commonly associated with attempts to execute arbitrary commands or escalate privileges, potentially leading to unauthorized access or further exploitation.
references:
- https://gtfobins.github.io/gtfobins/awk/#shell
- https://gtfobins.github.io/gtfobins/gawk/#shell
- https://gtfobins.github.io/gtfobins/nawk/#shell
- https://gtfobins.github.io/gtfobins/mawk/#shell
author: Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.)
date: 2024-09-02
tags:
- attack.execution
- attack.t1059
logsource:
category: process_creation
product: linux
detection:
selection_img:
Image|endswith:
- '/awk'
- '/gawk'
- '/mawk'
- '/nawk'
CommandLine|contains: 'BEGIN {system'
selection_cli:
CommandLine|contains:
- '/bin/bash'
- '/bin/dash'
- '/bin/fish'
- '/bin/sh'
- '/bin/zsh'
condition: all of selection_*
falsepositives:
- Unknown
level: high
title: Python One-Liners with Base64 Decoding - Linux
id: 55e862a8-dd9c-4651-807a-f21fcad56716
related:
- id: 50a0aa3d-ab16-4594-a8aa-5145a6e6792b
type: similar
status: experimental
description: |
Detects the use of Python's base64 decoding functions in command line executions on Linux systems.
Malicious scripts often use python one-liners to decode and execute base64-encoded payloads, which is a common technique for obfuscation and evasion.
references:
- https://docs.python.org/3/library/base64.html
- https://www.virustotal.com/gui/file/bc43e925d7b4b74319f6e74e836a96f1997ba404e14ac566cf12a21e9da463db/behavior
- https://cloud.google.com/blog/topics/threat-intelligence/cybercriminals-weaponize-fake-ai-websites
author: Hugh Ryan (HueCodes), Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2026-03-09
tags:
- attack.execution
- attack.stealth
- attack.t1059.006
- attack.t1027.010
logsource:
category: process_creation
product: linux
detection:
selection_img:
Image|contains: '/python'
selection_cli:
CommandLine|contains|all:
- 'import'
- 'base64'
- ' -c'
CommandLine|contains:
- '.decode'
- 'b16decode'
- 'b32decode'
- 'b32hexdecode'
- 'b64decode'
- 'b85decode'
- 'z85decode'
condition: all of selection_*
falsepositives:
- Legitimate use of Python for decoding data, which is uncommon in typical enterprise environments but possible in development or data analysis contexts.
level: high
title: Linux Recon Indicators
id: 0cf7a157-8879-41a2-8f55-388dd23746b7
status: test
description: Detects events with patterns found in commands used for reconnaissance on linux systems
references:
- https://github.com/sleventyeleven/linuxprivchecker/blob/0d701080bbf92efd464e97d71a70f97c6f2cd658/linuxprivchecker.py
author: Florian Roth (Nextron Systems)
date: 2022-06-20
tags:
- attack.reconnaissance
- attack.t1592.004
- attack.credential-access
- attack.t1552.001
logsource:
category: process_creation
product: linux
detection:
selection:
CommandLine|contains:
- ' -name .htpasswd'
- ' -perm -4000 '
condition: selection
falsepositives:
- Legitimate administration activities
level: high
title: Script Interpreter Spawning Credential Scanner - Linux
id: f0025a69-e1b7-4dda-a53c-db21fa2d4071
related:
- id: 0f60b28c-64dd-4e2c-9a63-5334d3e3a6e6
type: similar
status: experimental
description: |
Detects a script interpreter process (like node.js or bun) spawning a known credential scanning tool (e.g., trufflehog, gitleaks).
This behavior is indicative of an attempt to find and steal secrets, as seen in the "Shai-Hulud: The Second Coming" campaign.
references:
- https://github.com/asyncapi/cli/blob/2efa4dff59bc3d3cecdf897ccf178f99b115d63d/bun_environment.js
- https://www.stepsecurity.io/blog/sha1-hulud-the-second-coming-zapier-ens-domains-and-other-prominent-npm-packages-compromised
- https://www.endorlabs.com/learn/shai-hulud-2-malware-campaign-targets-github-and-cloud-credentials-using-bun-runtime
- https://semgrep.dev/blog/2025/digging-for-secrets-sha1-hulud-the-second-coming-of-the-npm-worm/
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2025-11-25
tags:
- attack.credential-access
- attack.t1552
- attack.execution
- attack.collection
- attack.t1005
- attack.t1059.004
logsource:
category: process_creation
product: linux
detection:
selection_parent:
ParentImage|endswith:
# Add more script interpreters as needed
- '/node'
- '/bun'
selection_child:
- Image|endswith:
- '/trufflehog'
- '/gitleaks'
- CommandLine|contains:
- 'trufflehog'
- 'gitleaks'
condition: all of selection_*
falsepositives:
- Legitimate pre-commit hooks or CI/CD pipeline jobs that use a script to run a credential scanner as part of a security check.
level: high
title: Shell Execution via Nice - Linux
id: 093d68c7-762a-42f4-9f46-95e79142571a
status: test
description: |
Detects the use of the "nice" utility to execute a shell. Such behavior may be associated with privilege escalation, unauthorized command execution, or to break out from restricted environments.
references:
- https://gtfobins.github.io/gtfobins/nice/#shell
- https://www.elastic.co/guide/en/security/current/linux-restricted-shell-breakout-via-linux-binary-s.html
author: Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.)
date: 2024-09-02
tags:
- attack.discovery
- attack.t1083
logsource:
category: process_creation
product: linux
detection:
selection:
Image|endswith: '/nice'
CommandLine|endswith:
- '/bin/bash'
- '/bin/dash'
- '/bin/fish'
- '/bin/sh'
- '/bin/zsh'
condition: selection
falsepositives:
- Unknown
level: high
title: Suspicious Java Children Processes
id: d292e0af-9a18-420c-9525-ec0ac3936892
status: test
description: Detects java process spawning suspicious children
references:
- https://www.tecmint.com/different-types-of-linux-shells/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-06-03
tags:
- attack.execution
- attack.t1059
logsource:
category: process_creation
product: linux
detection:
selection:
ParentImage|endswith: '/java'
CommandLine|contains:
- '/bin/sh'
- 'bash'
- 'dash'
- 'ksh'
- 'zsh'
- 'csh'
- 'fish'
- 'curl'
- 'wget'
- 'python'
condition: selection
falsepositives:
- Unknown
level: high
title: Vim GTFOBin Abuse - Linux
id: 7ab8f73a-fcff-428b-84aa-6a5ff7877dea
status: test
description: |
Detects the use of "vim" and it's siblings commands to execute a shell or proxy commands.
Such behavior may be associated with privilege escalation, unauthorized command execution, or to break out from restricted environments.
references:
- https://gtfobins.github.io/gtfobins/vim/
- https://gtfobins.github.io/gtfobins/rvim/
- https://gtfobins.github.io/gtfobins/vimdiff/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-12-28
modified: 2024-09-02
tags:
- attack.discovery
- attack.t1083
logsource:
category: process_creation
product: linux
detection:
selection_img:
Image|endswith:
- '/rvim'
- '/vim'
- '/vimdiff'
CommandLine|contains:
- ' --cmd'
- ' -c '
selection_cli:
CommandLine|contains:
- ':!/'
- ':lua '
- ':py '
- '/bin/bash'
- '/bin/dash'
- '/bin/fish'
- '/bin/sh'
- '/bin/zsh'
condition: all of selection_*
falsepositives:
- Unknown
level: high
title: Shell Invocation Via Ssh - Linux
id: 8737b7f6-8df3-4bb7-b1da-06019b99b687
status: test
description: |
Detects the use of the "ssh" utility to execute a shell. Such behavior may be associated with privilege escalation, unauthorized command execution, or to break out from restricted environments.
references:
- https://gtfobins.github.io/gtfobins/ssh/
- https://www.elastic.co/guide/en/security/current/linux-restricted-shell-breakout-via-linux-binary-s.html
author: Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.)
date: 2024-08-29
tags:
- attack.execution
- attack.t1059
logsource:
category: process_creation
product: linux
detection:
selection_img:
Image|endswith: '/ssh'
CommandLine|contains:
- 'ProxyCommand=;'
- 'permitlocalcommand=yes'
- 'localhost'
selection_cli:
CommandLine|contains:
- '/bin/bash'
- '/bin/dash'
- '/bin/fish'
- '/bin/sh'
- '/bin/zsh'
- 'sh 0<&2 1>&2'
- 'sh 1>&2 0<&2'
condition: all of selection_*
falsepositives:
- Unknown
level: high
title: OMIGOD SCX RunAsProvider ExecuteScript
id: 6eea1bf6-f8d2-488a-a742-e6ef6c1b67db
status: test
description: |
Rule to detect the use of the SCX RunAsProvider ExecuteScript to execute any UNIX/Linux script using the /bin/sh shell.
Script being executed gets created as a temp file in /tmp folder with a scx* prefix.
Then it is invoked from the following directory /etc/opt/microsoft/scx/conf/tmpdir/.
The file in that directory has the same prefix scx*. SCXcore, started as the Microsoft Operations Manager UNIX/Linux Agent, is now used in a host of products including
Microsoft Operations Manager, Microsoft Azure, and Microsoft Operations Management Suite.
references:
- https://www.wiz.io/blog/omigod-critical-vulnerabilities-in-omi-azure
- https://github.com/Azure/Azure-Sentinel/pull/3059
author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research), MSTIC
date: 2021-10-15
modified: 2022-10-05
tags:
- attack.privilege-escalation
- attack.initial-access
- attack.execution
- attack.t1068
- attack.t1190
- attack.t1203
logsource:
product: linux
category: process_creation
detection:
selection:
User: root
LogonId: 0
CurrentDirectory: '/var/opt/microsoft/scx/tmp'
CommandLine|contains: '/etc/opt/microsoft/scx/conf/tmpdir/scx'
condition: selection
falsepositives:
- Legitimate use of SCX RunAsProvider ExecuteScript.
level: high