PUA - Crassus Execution — Sigma Rule

Rule metadata and linked tags

Author: pH-T (Nextron Systems). Source status: test; severity: high. Source dates: 2023-04-17 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 9889b0add3a578b0279775c3ad5a8d2c98aec961f2d1b7c0bba1bcb0389dd6be

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: PUA - Crassus Execution
id: 2c32b543-1058-4808-91c6-5b31b8bed6c5
status: test
description: Detects Crassus, a Windows privilege escalation discovery tool, based on PE metadata characteristics.
references:
    - https://github.com/vu-ls/Crassus
author: pH-T (Nextron Systems)
date: 2023-04-17
tags:
    - attack.discovery
    - attack.reconnaissance
    - attack.t1590.001
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        - Image|endswith: '\Crassus.exe'
        - OriginalFileName: 'Crassus.exe'
        - Description|contains: 'Crassus'
    condition: selection
falsepositives:
    - Unlikely
level: high

Original YAML and metadata in JSON

False positives

• Unlikely

Source references

• https://github.com/vu-ls/Crassus