Suspicious PsExec Execution

 1title: Suspicious PsExec Execution
 2id: c462f537-a1e3-41a6-b5fc-b2c2cef9bf82
 3status: test
 4description: 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
 5references:
 6    - https://blog.menasec.net/2019/02/threat-hunting-3-detecting-psexec.html
 7author: Samir Bousseaden
 8date: 2019/04/03
 9modified: 2022/08/11
10tags:
11    - attack.lateral_movement
12    - attack.t1021.002
13logsource:
14    product: windows
15    service: security
16    definition: 'The advanced audit policy setting "Object Access > Audit Detailed File Share" must be configured for Success/Failure'
17detection:
18    selection1:
19        EventID: 5145
20        ShareName: '\\\\\*\\IPC$' # looking for the string \\*\IPC$
21        RelativeTargetName|endswith:
22            - '-stdin'
23            - '-stdout'
24            - '-stderr'
25    filter:
26        RelativeTargetName|startswith: 'PSEXESVC'
27    condition: selection1 and not filter
28falsepositives:
29    - Unknown
30level: high