Change User Account Associated with the FAX Service — Sigma Rule

Rule metadata and linked tags

Author: frack113. Source status: test; severity: high. Source dates: 2022-07-17 / 2022-12-30.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: d8427404bc1328d1162fca41fdb59e2e4f3e623977732af3b35503a8429047fb

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: Change User Account Associated with the FAX Service
id: e3fdf743-f05b-4051-990a-b66919be1743
status: test
description: Detect change of the user account associated with the FAX service to avoid the escalation problem.
references:
    - https://twitter.com/dottor_morte/status/1544652325570191361
    - https://raw.githubusercontent.com/RiccardoAncarani/talks/master/F-Secure/unorthodox-lateral-movement.pdf
author: frack113
date: 2022-07-17
modified: 2022-12-30
tags:
    - attack.persistence
    - attack.defense-impairment
    - attack.t1112
logsource:
    product: windows
    category: registry_set
detection:
    selection:
        TargetObject: HKLM\System\CurrentControlSet\Services\Fax\ObjectName
    filter:
        Details|contains: NetworkService
    condition: selection and not filter
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://twitter.com/dottor_morte/status/1544652325570191361
• https://raw.githubusercontent.com/RiccardoAncarani/talks/master/F-Secure/unorthodox-lateral-movement.pdf