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Sigma rules for CVE-2018-5710

15 rules · scoped to cve · back to CVE-2018-5710

Direct rules mention this entity in their title or description. Related rules cover the techniques this entity is known to use.

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Detection rules

15 of 15

direct high

Suspicious DNS Query Indicating Kerberos Coercion via DNS Object SPN Spoofing - Network

Detects DNS queries containing patterns associated with Kerberos coercion attacks via DNS object spoofing. The pattern "1UWhRCAAAAA..BAAAA" is a base64-encoded signature that corresponds to a marshaled CREDENTIAL_TARGET_INFORMATION structure. Attackers can use this technique to coerce authentication from victim systems to attacker-controlled hosts. It is one of the strong indicators of a Kerberos coercion attack, where adversaries manipulate DNS records to spoof Service Principal Names (SPNs) and redirect authentication requests like CVE-2025-33073.

status experimental author Swachchhanda Shrawan Poudel (Nextron Systems) id 5588576c-5898-4fac-bcdd-7475a60e8f43 license Sigma · DRL-1.1

view Sigma YAML

title: Suspicious DNS Query Indicating Kerberos Coercion via DNS Object SPN Spoofing - Network
id: 5588576c-5898-4fac-bcdd-7475a60e8f43
related:
    - id: b07e58cf-cacc-4135-8473-ccb2eba63dd2 # Potential Kerberos Coercion via DNS Object Spoofing
      type: similar
    - id: e7a21b5f-d8c4-4ae5-b8d9-93c5d3f28e1c # Suspicious DNS Query Indicating Kerberos Coercion via DNS Object Spoofing
      type: similar
status: experimental
description: |
    Detects DNS queries containing patterns associated with Kerberos coercion attacks via DNS object spoofing.
    The pattern "1UWhRCAAAAA..BAAAA" is a base64-encoded signature that corresponds to a marshaled CREDENTIAL_TARGET_INFORMATION structure.
    Attackers can use this technique to coerce authentication from victim systems to attacker-controlled hosts.
    It is one of the strong indicators of a Kerberos coercion attack, where adversaries manipulate DNS records
    to spoof Service Principal Names (SPNs) and redirect authentication requests like CVE-2025-33073.
references:
    - https://www.synacktiv.com/publications/ntlm-reflection-is-dead-long-live-ntlm-reflection-an-in-depth-analysis-of-cve-2025
    - https://googleprojectzero.blogspot.com/2021/10/using-kerberos-for-authentication-relay.html
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2025-06-20
tags:
    - attack.collection
    - attack.credential-access
    - attack.persistence
    - attack.privilege-escalation
    - attack.t1557.001
    - attack.t1187
logsource:
    product: zeek
    service: dns
detection:
    selection:
        query|contains|all:
            - 'UWhRCA' # Follows this pattern UWhRCAAAAA..BAAA
            - 'BAAAA'
    condition: selection
falsepositives:
    - Unknown
level: high

direct high

Suspicious Kerberos Ticket Request via PowerShell Script - ScriptBlock

Detects PowerShell scripts that utilize native PowerShell Identity modules to request Kerberos tickets. This behavior is typically seen during a Kerberos or silver ticket attack. A successful execution will output the SPNs for the endpoint in question.

status test author frack113 id a861d835-af37-4930-bcd6-5b178bfb54df license Sigma · DRL-1.1

view Sigma YAML

title: Suspicious Kerberos Ticket Request via PowerShell Script - ScriptBlock
id: a861d835-af37-4930-bcd6-5b178bfb54df
related:
    - id: caa9a802-8bd8-4b9e-a5cd-4d6221670219
      type: similar
status: test
description: |
    Detects PowerShell scripts that utilize native PowerShell Identity modules to request Kerberos tickets.
    This behavior is typically seen during a Kerberos or silver ticket attack. A successful execution will output the SPNs for the endpoint in question.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1558.003/T1558.003.md#atomic-test-4---request-a-single-ticket-via-powershell
    - https://learn.microsoft.com/en-us/dotnet/api/system.identitymodel.tokens.kerberosrequestorsecuritytoken?view=netframework-4.8.1
author: frack113
date: 2021-12-28
modified: 2025-11-18
tags:
    - attack.credential-access
    - attack.t1558.003
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains|all:
            - 'System.IdentityModel.Tokens.KerberosRequestorSecurityToken'
            - '.GetRequest()'
    condition: selection
falsepositives:
    - Unknown
level: high

direct high

Suspicious DNS Query Indicating Kerberos Coercion via DNS Object SPN Spoofing

status experimental author Swachchhanda Shrawan Poudel (Nextron Systems) id e7a21b5f-d8c4-4ae5-b8d9-93c5d3f28e1c license Sigma · DRL-1.1

view Sigma YAML

title: Suspicious DNS Query Indicating Kerberos Coercion via DNS Object SPN Spoofing
id: e7a21b5f-d8c4-4ae5-b8d9-93c5d3f28e1c
related:
    - id: b07e58cf-cacc-4135-8473-ccb2eba63dd2 # Potential Kerberos Coercion via DNS Object Spoofing
      type: similar
    - id: 5588576c-5898-4fac-bcdd-7475a60e8f43 # Suspicious DNS Query Indicating Kerberos Coercion via DNS Object Spoofing - Network
      type: similar
status: experimental
description: |
    Detects DNS queries containing patterns associated with Kerberos coercion attacks via DNS object spoofing.
    The pattern "1UWhRCAAAAA..BAAAA" is a base64-encoded signature that corresponds to a marshaled CREDENTIAL_TARGET_INFORMATION structure.
    Attackers can use this technique to coerce authentication from victim systems to attacker-controlled hosts.
    It is one of the strong indicators of a Kerberos coercion attack, where adversaries manipulate DNS records
    to spoof Service Principal Names (SPNs) and redirect authentication requests like CVE-2025-33073.
references:
    - https://www.synacktiv.com/publications/ntlm-reflection-is-dead-long-live-ntlm-reflection-an-in-depth-analysis-of-cve-2025
    - https://googleprojectzero.blogspot.com/2021/10/using-kerberos-for-authentication-relay.html
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2025-06-20
tags:
    - attack.collection
    - attack.credential-access
    - attack.persistence
    - attack.privilege-escalation
    - attack.t1557.001
    - attack.t1187
logsource:
    product: windows
    category: dns_query
detection:
    selection:
        QueryName|contains|all:
            - 'UWhRCA'
            - 'BAAAA'
    condition: selection
falsepositives:
    - Unknown
level: high

direct high

Attempts of Kerberos Coercion Via DNS SPN Spoofing

Detects the presence of "UWhRC....AAYBAAAA" pattern in command line. The pattern "1UWhRCAAAAA..BAAAA" is a base64-encoded signature that corresponds to a marshaled CREDENTIAL_TARGET_INFORMATION structure. Attackers can use this technique to coerce authentication from victim systems to attacker-controlled hosts. It is one of the strong indicators of a Kerberos coercion attack, where adversaries manipulate DNS records to spoof Service Principal Names (SPNs) and redirect authentication requests like in CVE-2025-33073. If you see this pattern in the command line, it is likely an attempt to add spoofed Service Principal Names (SPNs) to DNS records, or checking for the presence of such records through the `nslookup` command.

status experimental author Swachchhanda Shrawan Poudel (Nextron Systems) id 0ed99dda-6a35-11ef-8c99-0242ac120002 license Sigma · DRL-1.1

view Sigma YAML

title: Attempts of Kerberos Coercion Via DNS SPN Spoofing
id: 0ed99dda-6a35-11ef-8c99-0242ac120002
related:
    - id: b07e58cf-cacc-4135-8473-ccb2eba63dd2
      type: similar
status: experimental
description: |
    Detects the presence of "UWhRC....AAYBAAAA" pattern in command line.
    The pattern "1UWhRCAAAAA..BAAAA" is a base64-encoded signature that corresponds to a marshaled CREDENTIAL_TARGET_INFORMATION structure.
    Attackers can use this technique to coerce authentication from victim systems to attacker-controlled hosts.
    It is one of the strong indicators of a Kerberos coercion attack, where adversaries manipulate DNS records
    to spoof Service Principal Names (SPNs) and redirect authentication requests like in CVE-2025-33073.
    If you see this pattern in the command line, it is likely an attempt to add spoofed Service Principal Names (SPNs) to DNS records,
    or checking for the presence of such records through the `nslookup` command.
references:
    - https://www.synacktiv.com/publications/ntlm-reflection-is-dead-long-live-ntlm-reflection-an-in-depth-analysis-of-cve-2025
    - https://googleprojectzero.blogspot.com/2021/10/using-kerberos-for-authentication-relay.html
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2025-06-20
tags:
    - attack.collection
    - attack.credential-access
    - attack.persistence
    - attack.privilege-escalation
    - attack.t1557.001
    - attack.t1187
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|contains|all:
            - 'UWhRCA'
            - 'BAAAA'
    condition: selection
falsepositives:
    - Unknown
level: high

direct high

Suspicious Kerberos Ticket Request via CLI

Detects suspicious Kerberos ticket requests via command line using System.IdentityModel.Tokens.KerberosRequestorSecurityToken class. Threat actors may use command line interfaces to request Kerberos tickets for service accounts in order to perform offline password cracking attacks commonly known as Kerberoasting or other Kerberos ticket abuse techniques like silver ticket attacks.

status experimental author Swachchhanda Shrawan Poudel (Nextron Systems) id caa9a802-8bd8-4b9e-a5cd-4d6221670219 license Sigma · DRL-1.1

view Sigma YAML

title: Suspicious Kerberos Ticket Request via CLI
id: caa9a802-8bd8-4b9e-a5cd-4d6221670219
related:
    - id: a861d835-af37-4930-bcd6-5b178bfb54df
      type: similar
status: experimental
description: |
    Detects suspicious Kerberos ticket requests via command line using System.IdentityModel.Tokens.KerberosRequestorSecurityToken class.
    Threat actors may use command line interfaces to request Kerberos tickets for service accounts in order to
    perform offline password cracking attacks commonly known as Kerberoasting or other Kerberos ticket abuse
    techniques like silver ticket attacks.
references:
    - https://www.huntress.com/blog/gootloader-threat-detection-woff2-obfuscation
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1558.003/T1558.003.md#atomic-test-4---request-a-single-ticket-via-powershell
    - https://learn.microsoft.com/en-us/dotnet/api/system.identitymodel.tokens.kerberosrequestorsecuritytoken?view=netframework-4.8.1
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2025-11-18
tags:
    - attack.credential-access
    - attack.t1558.003
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith:
              - '\powershell.exe'
              - '\pwsh.exe'
        - OriginalFileName:
              - 'powershell.exe'
              - 'pwsh.dll'
    selection_cli:
        CommandLine|contains|all:
            - 'System.IdentityModel.Tokens.KerberosRequestorSecurityToken'
            - '.GetRequest()'
    condition: all of selection_*
falsepositives:
    - Legitimate command line usage by administrators or security tools.
level: high

direct high

Potential Kerberos Coercion by Spoofing SPNs via DNS Manipulation

Detects modifications to DNS records in Active Directory where the Distinguished Name (DN) contains a base64-encoded blob matching the pattern "1UWhRCAAAAA...BAAAA". This pattern corresponds to a marshaled CREDENTIAL_TARGET_INFORMATION structure, commonly used in Kerberos coercion attacks. Adversaries may exploit this to coerce victim systems into authenticating to attacker-controlled hosts by spoofing SPNs via DNS. It is one of the strong indicators of a Kerberos coercion attack,. where adversaries manipulate DNS records to spoof Service Principal Names (SPNs) and redirect authentication requests like CVE-2025-33073. Please investigate the user account that made the changes, as it is likely a low-privileged account that has been compromised.

status experimental author Swachchhanda Shrawan Poudel (Nextron Systems) id b07e58cf-cacc-4135-8473-ccb2eba63dd2 license Sigma · DRL-1.1

view Sigma YAML

title: Potential Kerberos Coercion by Spoofing SPNs via DNS Manipulation
id: b07e58cf-cacc-4135-8473-ccb2eba63dd2
related:
    - id: e7a21b5f-d8c4-4ae5-b8d9-93c5d3f28e1c # Suspicious DNS Query Indicating Kerberos Coercion via DNS Object Spoofing
      type: similar
    - id: 5588576c-5898-4fac-bcdd-7475a60e8f43 # Suspicious DNS Query Indicating Kerberos Coercion via DNS Object Spoofing - Network
      type: similar
    - id: 0ed99dda-6a35-11ef-8c99-0242ac120002 # Kerberos Coercion Via DNS SPN Spoofing Attempt
      type: similar
status: experimental
description: |
    Detects modifications to DNS records in Active Directory where the Distinguished Name (DN) contains a base64-encoded blob
    matching the pattern "1UWhRCAAAAA...BAAAA". This pattern corresponds to a marshaled CREDENTIAL_TARGET_INFORMATION structure,
    commonly used in Kerberos coercion attacks. Adversaries may exploit this to coerce victim systems into authenticating to
    attacker-controlled hosts by spoofing SPNs via DNS. It is one of the strong indicators of a Kerberos coercion attack,.
    where adversaries manipulate DNS records to spoof Service Principal Names (SPNs) and redirect authentication requests like CVE-2025-33073.
    Please investigate the user account that made the changes, as it is likely a low-privileged account that has been compromised.
references:
    - https://googleprojectzero.blogspot.com/2021/10/using-kerberos-for-authentication-relay.html
    - https://www.synacktiv.com/publications/ntlm-reflection-is-dead-long-live-ntlm-reflection-an-in-depth-analysis-of-cve-2025
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2025-06-20
tags:
    - attack.collection
    - attack.credential-access
    - attack.t1557.003
    - attack.persistence
    - attack.privilege-escalation
logsource:
    product: windows
    service: security
    definition: |
      By default these events are not logged by default for MicrosoftDNS objects in Active Directory.
      To enable detection, configure an AuditRule on the DNS object container with the "CreateChild" permission for the "Everyone" principal.
      This can be accomplished using tools such as Set-AuditRule (see https://github.com/OTRF/Set-AuditRule).
detection:
    selection_directory_service_changes:
        EventID:
            - 5136
            - 5137
        ObjectClass: 'dnsNode'
        ObjectDN|contains|all: # ObjectDN">DC=foo-11UWhRCAAAAAAAAAAAAAAAAAAAAAAAAAAAAwbEAYBAAAA,DC=domain.com,CN=MicrosoftDNS,DC=DomainDnsZones,DC=domain,DC=com</Data>
            - 'UWhRCA'
            - 'BAAAA'
            - 'CN=MicrosoftDNS'
    selection_directory_service_access:
        EventID: 4662
        AdditionalInfo|contains|all: # AdditionalInfo">DC=foo-11UWhRCAAAAAAAAAAAAAAAAAAAAAAAAAAAAwbEAYBAAAA,DC=domain.com,CN=MicrosoftDNS,DC=DomainDnsZones,DC=domain,DC=com</Data>
            - 'UWhRCA'
            - 'BAAAA'
            - 'CN=MicrosoftDNS'
    condition: 1 of selection_*
falsepositives:
    - Unknown
level: high

direct high

PetitPotam Suspicious Kerberos TGT Request

Detect suspicious Kerberos TGT requests. Once an attacer obtains a computer certificate by abusing Active Directory Certificate Services in combination with PetitPotam, the next step would be to leverage the certificate for malicious purposes. One way of doing this is to request a Kerberos Ticket Granting Ticket using a tool like Rubeus. This request will generate a 4768 event with some unusual fields depending on the environment. This analytic will require tuning, we recommend filtering Account_Name to the Domain Controller computer accounts.

status test author Mauricio Velazco, Michael Haag id 6a53d871-682d-40b6-83e0-b7c1a6c4e3a5 license Sigma · DRL-1.1

view Sigma YAML

title: PetitPotam Suspicious Kerberos TGT Request
id: 6a53d871-682d-40b6-83e0-b7c1a6c4e3a5
status: test
description: |
    Detect suspicious Kerberos TGT requests.
    Once an attacer obtains a computer certificate by abusing Active Directory Certificate Services in combination with PetitPotam, the next step would be to leverage the certificate for malicious purposes.
    One way of doing this is to request a Kerberos Ticket Granting Ticket using a tool like Rubeus.
    This request will generate a 4768 event with some unusual fields depending on the environment.
    This analytic will require tuning, we recommend filtering Account_Name to the Domain Controller computer accounts.
references:
    - https://github.com/topotam/PetitPotam
    - https://isc.sans.edu/forums/diary/Active+Directory+Certificate+Services+ADCS+PKI+domain+admin+vulnerability/27668/
    - https://github.com/splunk/security_content/blob/88d689fe8a055d8284337b9fad5d9152b42043db/detections/endpoint/petitpotam_suspicious_kerberos_tgt_request.yml
author: Mauricio Velazco, Michael Haag
date: 2021-09-02
modified: 2022-10-05
tags:
    - attack.credential-access
    - attack.t1187
logsource:
    product: windows
    service: security
    definition: 'The advanced audit policy setting "Account Logon > Kerberos Authentication Service" must be configured for Success/Failure'
detection:
    selection:
        EventID: 4768
        TargetUserName|endswith: '$'
        CertThumbprint|contains: '*'
    filter_local:
        IpAddress: '::1'
    filter_thumbprint:
        CertThumbprint: ''
    condition: selection and not 1 of filter_*
falsepositives:
    - False positives are possible if the environment is using certificates for authentication. We recommend filtering Account_Name to the Domain Controller computer accounts.
level: high

direct high

Kerberos Manipulation

Detects failed Kerberos TGT issue operation. This can be a sign of manipulations of TGT messages by an attacker.

status test author Florian Roth (Nextron Systems) id f7644214-0eb0-4ace-9455-331ec4c09253 license Sigma · DRL-1.1

view Sigma YAML

title: Kerberos Manipulation
id: f7644214-0eb0-4ace-9455-331ec4c09253
status: test
description: Detects failed Kerberos TGT issue operation. This can be a sign of manipulations of TGT messages by an attacker.
references:
    - https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-10/security/threat-protection/auditing/event-4771
author: Florian Roth (Nextron Systems)
date: 2017-02-10
modified: 2024-01-16
tags:
    - attack.credential-access
    - attack.t1212
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID:
            - 675
            - 4768
            - 4769
            - 4771
        Status:
            - '0x9'
            - '0xA'
            - '0xB'
            - '0xF'
            - '0x10'
            - '0x11'
            - '0x13'
            - '0x14'
            - '0x1A'
            - '0x1F'
            - '0x21'
            - '0x22'
            - '0x23'
            - '0x24'
            - '0x26'
            - '0x27'
            - '0x28'
            - '0x29'
            - '0x2C'
            - '0x2D'
            - '0x2E'
            - '0x2F'
            - '0x31'
            - '0x32'
            - '0x3E'
            - '0x3F'
            - '0x40'
            - '0x41'
            - '0x43'
            - '0x44'
    condition: selection
falsepositives:
    - Faulty legacy applications
level: high

direct high

Potential Privilege Escalation via Local Kerberos Relay over LDAP

Detects a suspicious local successful logon event where the Logon Package is Kerberos, the remote address is set to localhost, and the target user SID is the built-in local Administrator account. This may indicate an attempt to leverage a Kerberos relay attack variant that can be used to elevate privilege locally from a domain joined limited user to local System privileges.

status test author Elastic, @SBousseaden id 749c9f5e-b353-4b90-a9c1-05243357ca4b license Sigma · DRL-1.1

view Sigma YAML

title: Potential Privilege Escalation via Local Kerberos Relay over LDAP
id: 749c9f5e-b353-4b90-a9c1-05243357ca4b
status: test
description: |
    Detects a suspicious local successful logon event where the Logon Package is Kerberos, the remote address is set to localhost, and the target user SID is the built-in local Administrator account.
    This may indicate an attempt to leverage a Kerberos relay attack variant that can be used to elevate privilege locally from a domain joined limited user to local System privileges.
references:
    - https://twitter.com/sbousseaden/status/1518976397364056071?s=12&t=qKO5eKHvWhAP19a50FTZ7g
    - https://github.com/elastic/detection-rules/blob/5fe7833312031a4787e07893e27e4ea7a7665745/rules/_deprecated/privilege_escalation_krbrelayup_suspicious_logon.toml#L38
author: Elastic, @SBousseaden
date: 2022-04-27
modified: 2024-08-13
tags:
    - attack.privilege-escalation
    - attack.credential-access
    - attack.t1548
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 4624
        LogonType: 3
        AuthenticationPackageName: 'Kerberos'
        IpAddress: '127.0.0.1'
        TargetUserSid|startswith: 'S-1-5-21-'
        TargetUserSid|endswith: '-500'
    filter_main_ip_null:
        IpPort: '0'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: high

direct medium

Kerberos Network Traffic RC4 Ticket Encryption

Detects kerberos TGS request using RC4 encryption which may be indicative of kerberoasting

status test author sigma id 503fe26e-b5f2-4944-a126-eab405cc06e5 license Sigma · DRL-1.1

view Sigma YAML

title: Kerberos Network Traffic RC4 Ticket Encryption
id: 503fe26e-b5f2-4944-a126-eab405cc06e5
status: test
description: Detects kerberos TGS request using RC4 encryption which may be indicative of kerberoasting
references:
    - https://adsecurity.org/?p=3458
author: sigma
date: 2020-02-12
modified: 2021-11-27
tags:
    - attack.credential-access
    - attack.t1558.003
logsource:
    product: zeek
    service: kerberos
detection:
    selection:
        request_type: 'TGS'
        cipher: 'rc4-hmac'
    computer_acct:
        service|startswith: '$'
    condition: selection and not computer_acct
falsepositives:
    - Normal enterprise SPN requests activity
level: medium

direct medium

Uncommon Outbound Kerberos Connection

Detects uncommon outbound network activity via Kerberos default port indicating possible lateral movement or first stage PrivEsc via delegation.

status test author Ilyas Ochkov, oscd.community id e54979bd-c5f9-4d6c-967b-a04b19ac4c74 license Sigma · DRL-1.1

view Sigma YAML

title: Uncommon Outbound Kerberos Connection
id: e54979bd-c5f9-4d6c-967b-a04b19ac4c74
related:
    - id: eca91c7c-9214-47b9-b4c5-cb1d7e4f2350
      type: similar
status: test
description: |
    Detects uncommon outbound network activity via Kerberos default port indicating possible lateral movement or first stage PrivEsc via delegation.
references:
    - https://github.com/GhostPack/Rubeus
author: Ilyas Ochkov, oscd.community
date: 2019-10-24
modified: 2024-03-15
tags:
    - attack.credential-access
    - attack.t1558
    - attack.lateral-movement
    - attack.t1550.003
logsource:
    category: network_connection
    product: windows
detection:
    selection:
        DestinationPort: 88
        Initiated: 'true'
    filter_main_lsass:
        Image: 'C:\Windows\System32\lsass.exe'
    filter_optional_chrome:
        Image:
            - 'C:\Program Files (x86)\Google\Chrome\Application\chrome.exe'
            - 'C:\Program Files\Google\Chrome\Application\chrome.exe'
    filter_optional_firefox:
        Image:
            - 'C:\Program Files (x86)\Mozilla Firefox\firefox.exe'
            - 'C:\Program Files\Mozilla Firefox\firefox.exe'
    filter_optional_tomcat:
        Image|endswith: '\tomcat\bin\tomcat8.exe'
    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
falsepositives:
    - Web Browsers and third party application might generate similar activity. An initial baseline is required.
level: medium

direct medium

Uncommon Outbound Kerberos Connection - Security

Detects uncommon outbound network activity via Kerberos default port indicating possible lateral movement or first stage PrivEsc via delegation.

status test author Ilyas Ochkov, oscd.community id eca91c7c-9214-47b9-b4c5-cb1d7e4f2350 license Sigma · DRL-1.1

view Sigma YAML

title: Uncommon Outbound Kerberos Connection - Security
id: eca91c7c-9214-47b9-b4c5-cb1d7e4f2350
related:
    - id: e54979bd-c5f9-4d6c-967b-a04b19ac4c74
      type: similar
status: test
description: |
    Detects uncommon outbound network activity via Kerberos default port indicating possible lateral movement or first stage PrivEsc via delegation.
references:
    - https://github.com/GhostPack/Rubeus
author: Ilyas Ochkov, oscd.community
date: 2019-10-24
modified: 2024-03-15
tags:
    - attack.lateral-movement
    - attack.credential-access
    - attack.t1558.003
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 5156
        DestPort: 88
    filter_main_lsass:
        Application|startswith:
            - '\device\harddiskvolume'
            - 'C:'
        Application|endswith: '\Windows\System32\lsass.exe'
    filter_optional_chrome:
        Application|startswith:
            - '\device\harddiskvolume'
            - 'C:'
        Application|endswith:
            - '\Program Files (x86)\Google\Chrome\Application\chrome.exe'
            - '\Program Files\Google\Chrome\Application\chrome.exe'
    filter_optional_firefox:
        Application|startswith:
            - '\device\harddiskvolume'
            - 'C:'
        Application|endswith:
            - '\Program Files (x86)\Mozilla Firefox\firefox.exe'
            - '\Program Files\Mozilla Firefox\firefox.exe'
    filter_optional_tomcat:
        Application|endswith: '\tomcat\bin\tomcat8.exe'
    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
falsepositives:
    - Web Browsers and third party application might generate similar activity. An initial baseline is required.
level: medium

direct medium

Potential AS-REP Roasting via Kerberos TGT Requests

Detects suspicious Kerberos TGT requests with pre-authentication disabled (Pre-Authentication Type = 0) and Ticket Encryption Type (0x17) i.e, RC4-HMAC. This may indicate an AS-REP Roasting attack, where attackers request AS-REP messages for accounts without pre-authentication and attempt to crack the encrypted ticket offline to recover user passwords.

status experimental author ANosir id 3e2f1b2c-4d5e-11ee-be56-0242ac120002 license Sigma · DRL-1.1

view Sigma YAML

title: Potential AS-REP Roasting via Kerberos TGT Requests
id: 3e2f1b2c-4d5e-11ee-be56-0242ac120002
status: experimental
description: |
    Detects suspicious Kerberos TGT requests with pre-authentication disabled (Pre-Authentication Type = 0) and Ticket Encryption Type (0x17) i.e, RC4-HMAC.
    This may indicate an AS-REP Roasting attack, where attackers request AS-REP messages for accounts without pre-authentication and attempt to crack the encrypted ticket offline to recover user passwords.
references:
    - https://medium.com/system-weakness/detecting-as-rep-roasting-attacks-b5b3965f9714
    - https://www.picussecurity.com/resource/blog/as-rep-roasting-attack-explained-mitre-attack-t1558.004
author: ANosir
date: 2025-05-22
modified: 2025-07-04
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 4768
        TicketEncryptionType: '0x17'
        ServiceName: 'krbtgt'
        PreAuthType: 0
    condition: selection
falsepositives:
    - Legacy systems or applications that legitimately use RC4 encryption
    - Misconfigured accounts with pre-authentication disabled
level: medium

direct medium

Suspicious Kerberos RC4 Ticket Encryption

Detects service ticket requests using RC4 encryption type

status test author Florian Roth (Nextron Systems) id 496a0e47-0a33-4dca-b009-9e6ca3591f39 license Sigma · DRL-1.1

view Sigma YAML

title: Suspicious Kerberos RC4 Ticket Encryption
id: 496a0e47-0a33-4dca-b009-9e6ca3591f39
status: test
description: Detects service ticket requests using RC4 encryption type
references:
    - https://adsecurity.org/?p=3458
    - https://www.trimarcsecurity.com/single-post/TrimarcResearch/Detecting-Kerberoasting-Activity
author: Florian Roth (Nextron Systems)
date: 2017-02-06
modified: 2022-06-19
tags:
    - attack.credential-access
    - attack.t1558.003
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 4769
        TicketOptions: '0x40810000'
        TicketEncryptionType: '0x17'
    reduction:
        ServiceName|endswith: '$'
    condition: selection and not reduction
falsepositives:
    - Service accounts used on legacy systems (e.g. NetApp)
    - Windows Domains with DFL 2003 and legacy systems
level: medium

direct low

No Suitable Encryption Key Found For Generating Kerberos Ticket

Detects errors when a target server doesn't have suitable keys for generating kerberos tickets. This issue can occur for example when a service uses a user account or a computer account that is configured for only DES encryption on a computer that is running Windows 7 which has DES encryption for Kerberos authentication disabled.

status test author @SerkinValery id b1e0b3f5-b62e-41be-886a-daffde446ad4 license Sigma · DRL-1.1

view Sigma YAML

title: No Suitable Encryption Key Found For Generating Kerberos Ticket
id: b1e0b3f5-b62e-41be-886a-daffde446ad4
status: test
description: |
    Detects errors when a target server doesn't have suitable keys for generating kerberos tickets.
    This issue can occur for example when a service uses a user account or a computer account that is configured for only DES encryption on a computer that is running Windows 7 which has DES encryption for Kerberos authentication disabled.
references:
    - https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-r2-and-2008/dd348773(v=ws.10)
    - https://learn.microsoft.com/en-us/troubleshoot/windows-server/windows-security/kdc-event-16-27-des-encryption-disabled
author: '@SerkinValery'
date: 2024-03-07
modified: 2025-09-22
tags:
    - attack.credential-access
    - attack.t1558.003
logsource:
    product: windows
    service: system
detection:
    selection:
        Provider_Name:
            - 'Kerberos-Key-Distribution-Center'
            - 'Microsoft-Windows-Kerberos-Key-Distribution-Center'
        EventID:
            - 16 # KDCEVENT_NO_KEY_INTERSECTION_TGS
            - 27 # KDCEVENT_UNSUPPORTED_ETYPE_REQUEST_TGS
    condition: selection
falsepositives:
    - Unknown
level: low

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