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Sigma rules for CVE-2021-40809

2 rules · scoped to cve · back to CVE-2021-40809

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

2 of 2

direct medium

JAMF MDM Potential Suspicious Child Process

Detects potential suspicious child processes of "jamf". Could be a sign of potential abuse of Jamf as a C2 server as seen by Typhon MythicAgent.

status test author Nasreddine Bencherchali (Nextron Systems) id 2316929c-01aa-438c-970f-099145ab1ee6 license Sigma · DRL-1.1

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title: JAMF MDM Potential Suspicious Child Process
id: 2316929c-01aa-438c-970f-099145ab1ee6
status: test
description: Detects potential suspicious child processes of "jamf". Could be a sign of potential abuse of Jamf as a C2 server as seen by Typhon MythicAgent.
references:
    - https://github.com/MythicAgents/typhon/
    - https://www.zoocoup.org/casper/jamf_cheatsheet.pdf
    - https://docs.jamf.com/10.30.0/jamf-pro/administrator-guide/Components_Installed_on_Managed_Computers.html
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-08-22
tags:
    - attack.execution
logsource:
    category: process_creation
    product: macos
detection:
    selection:
        ParentImage|endswith: '/jamf'
        Image|endswith:
            # Note: Add additional binaries/commands that are uncommon during your typical admin usage of Jamf
            - '/bash'
            - '/sh'
    condition: selection
falsepositives:
    - Legitimate execution of custom scripts or commands by Jamf administrators. Apply additional filters accordingly
level: medium

direct low

JAMF MDM Execution

Detects execution of the "jamf" binary to create user accounts and run commands. For example, the binary can be abused by attackers on the system in order to bypass security controls or remove application control polices.

status test author Jay Pandit id be2e3a5c-9cc7-4d02-842a-68e9cb26ec49 license Sigma · DRL-1.1

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title: JAMF MDM Execution
id: be2e3a5c-9cc7-4d02-842a-68e9cb26ec49
status: test
description: |
    Detects execution of the "jamf" binary to create user accounts and run commands. For example, the binary can be abused by attackers on the system in order to bypass security controls or remove application control polices.
references:
    - https://github.com/MythicAgents/typhon/
    - https://www.zoocoup.org/casper/jamf_cheatsheet.pdf
    - https://docs.jamf.com/10.30.0/jamf-pro/administrator-guide/Components_Installed_on_Managed_Computers.html
author: Jay Pandit
date: 2023-08-22
tags:
    - attack.execution
logsource:
    category: process_creation
    product: macos
detection:
    selection:
        Image|endswith: '/jamf'
        CommandLine|contains:
            # Note: add or remove commands according to your policy
            - 'createAccount'
            - 'manage'
            - 'removeFramework'
            - 'removeMdmProfile'
            - 'resetPassword'
            - 'setComputerName'
    condition: selection
falsepositives:
    - Legitimate use of the JAMF CLI tool by IT support and administrators
level: low

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