Psexec Execution — Sigma Rule

Rule metadata and linked tags

Author: omkar72. Source status: test; severity: medium. Source dates: 2020-10-30 / 2023-02-28.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 93321d8710f0ba6b66c32e7f72598e2037d2c4e51ad56f206d6621e94c53635c

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Psexec Execution
id: 730fc21b-eaff-474b-ad23-90fd265d4988
status: test
description: Detects user accept agreement execution in psexec commandline
references:
    - https://www.fireeye.com/blog/threat-research/2020/10/kegtap-and-singlemalt-with-a-ransomware-chaser.html
author: omkar72
date: 2020-10-30
modified: 2023-02-28
tags:
    - attack.execution
    - attack.lateral-movement
    - attack.t1569
    - attack.t1021
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        - Image|endswith: '\psexec.exe'
        - OriginalFileName: 'psexec.c'
    condition: selection
falsepositives:
    - Administrative scripts.
level: medium

Original YAML and metadata in JSON

False positives

• Administrative scripts.

Source references

• https://www.fireeye.com/blog/threat-research/2020/10/kegtap-and-singlemalt-with-a-ransomware-chaser.html