SigmaHQ/rules/windows/builtin/win_susp_psexec.yml

title: Suspicious PsExec Execution
id: c462f537-a1e3-41a6-b5fc-b2c2cef9bf82
description: detects execution of psexec or paexec with renamed service name, this rule helps to filter out the noise if psexec is used for legit purposes or if attacker uses a different psexec client other than sysinternal one
author: Samir Bousseaden
date: 2019/04/03
references:
    - https://blog.menasec.net/2019/02/threat-hunting-3-detecting-psexec.html
tags:
    - attack.lateral_movement
    - attack.t1077           # an old one
    - attack.t1021.002
logsource:
    product: windows
    service: security
    definition: 'The advanced audit policy setting "Object Access > Audit Detailed File Share" must be configured for Success/Failure'
detection:
    selection1:
        EventID: 5145
        ShareName: \\*\IPC$
        RelativeTargetName|endswith:
            - '-stdin'
            - '-stdout'
            - '-stderr'
    selection2:
        EventID: 5145
        ShareName: \\*\IPC$
        RelativeTargetName|startswith: 'PSEXESVC'
    condition: selection1 and not selection2
falsepositives:
    - nothing observed so far
level: high