Potential Credential Dumping Via LSASS SilentProcessExit Technique — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: critical. Source dates: 2021-02-26 / 2022-12-19.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: ccab5daebb26fc807f402b9bc263da75d4efded70ce934512ee75e5fd8d3c02d

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: Potential Credential Dumping Via LSASS SilentProcessExit Technique
id: 55e29995-75e7-451a-bef0-6225e2f13597
related:
    - id: 36803969-5421-41ec-b92f-8500f79c23b0
      type: similar
status: test
description: Detects changes to the Registry in which a monitor program gets registered to dump the memory of the lsass.exe process
references:
    - https://www.deepinstinct.com/2021/02/16/lsass-memory-dumps-are-stealthier-than-ever-before-part-2/
    - https://oddvar.moe/2018/04/10/persistence-using-globalflags-in-image-file-execution-options-hidden-from-autoruns-exe/
author: Florian Roth (Nextron Systems)
date: 2021-02-26
modified: 2022-12-19
tags:
    - attack.credential-access
    - attack.t1003.001
logsource:
    category: registry_event
    product: windows
detection:
    selection:
        TargetObject|contains: 'Microsoft\Windows NT\CurrentVersion\SilentProcessExit\lsass.exe'
    condition: selection
falsepositives:
    - Unlikely
level: critical

Original YAML and metadata in JSON

False positives

• Unlikely

Source references

• https://www.deepinstinct.com/2021/02/16/lsass-memory-dumps-are-stealthier-than-ever-before-part-2/
• https://oddvar.moe/2018/04/10/persistence-using-globalflags-in-image-file-execution-options-hidden-from-autoruns-exe/