Credential Dumping Activity By Python Based Tool — Sigma Rule

Rule metadata and linked tags

Author: Bhabesh Raj, Jonhnathan Ribeiro. Source status: stable; severity: high. Source dates: 2023-11-27 / 2023-11-29.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 2ab74b2409374cfb9b6c340b099083ffa01805847a6aa9ce8e169e891bf2f62a

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: Credential Dumping Activity By Python Based Tool
id: f8be3e82-46a3-4e4e-ada5-8e538ae8b9c9
related:
    - id: 4b9a8556-99c4-470b-a40c-9c8d02c77ed0
      type: obsolete
    - id: 7186e989-4ed7-4f4e-a656-4674b9e3e48b
      type: obsolete
status: stable
description: Detects LSASS process access for potential credential dumping by a Python-like tool such as LaZagne or Pypykatz.
references:
    - https://twitter.com/bh4b3sh/status/1303674603819081728
    - https://github.com/skelsec/pypykatz
author: Bhabesh Raj, Jonhnathan Ribeiro
date: 2023-11-27
modified: 2023-11-29
tags:
    - attack.credential-access
    - attack.t1003.001
    - attack.s0349
logsource:
    category: process_access
    product: windows
detection:
    selection:
        TargetImage|endswith: '\lsass.exe'
        CallTrace|contains|all:
            - '_ctypes.pyd+'
            - ':\Windows\System32\KERNELBASE.dll+'
            - ':\Windows\SYSTEM32\ntdll.dll+'
        CallTrace|contains:
            - 'python27.dll+'
            - 'python3*.dll+'
        GrantedAccess: '0x1FFFFF'
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://twitter.com/bh4b3sh/status/1303674603819081728
• https://github.com/skelsec/pypykatz