lnx_auditd_omigod_scx_runasprovider_executescript.yml

title: OMIGOD SCX RunAsProvider ExecuteScript
id: 865c10a6-9541-4d11-9f45-9a3484e23b0a 
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.
status: experimental
date: 2021/09/18
modified: 2021/11/11
author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)
tags:
    - attack.privilege_escalation
    - attack.initial_access
    - attack.execution
    - attack.t1068
    - attack.t1190
    - attack.t1203
references:
    - https://www.wiz.io/blog/omigod-critical-vulnerabilities-in-omi-azure
    - https://censys.io/blog/understanding-the-impact-of-omigod-cve-2021-38647/
    - https://github.com/Azure/Azure-Sentinel/pull/3071/files
logsource:
    product: linux
    service: auditd
detection:
    selection:
        type: 'SYSCALL'
        syscall: 'execve'
        uid: '0'
        cwd: '/var/opt/microsoft/scx/tmp'
        cmdline|contains: /etc/opt/microsoft/scx/conf/tmpdir/scx
        comm: 'sh'
    condition: selection
falsepositives:
    - Legitimate use of SCX RunAsProvider ExecuteScript.
level: high