Change User Account Associated with the FAX Service

calendar Oct 23, 2025 · attack.persistence attack.defense-evasion attack.t1112  ·
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Detect change of the user account associated with the FAX service to avoid the escalation problem.

Sigma rule (View on GitHub)

 1title: Change User Account Associated with the FAX Service
 2id: e3fdf743-f05b-4051-990a-b66919be1743
 3status: test
 4description: Detect change of the user account associated with the FAX service to avoid the escalation problem.
 5references:
 6    - https://twitter.com/dottor_morte/status/1544652325570191361
 7    - https://raw.githubusercontent.com/RiccardoAncarani/talks/master/F-Secure/unorthodox-lateral-movement.pdf
 8author: frack113
 9date: 2022-07-17
10modified: 2022-12-30
11tags:
12    - attack.persistence
13    - attack.defense-evasion
14    - attack.t1112
15logsource:
16    product: windows
17    category: registry_set
18detection:
19    selection:
20        TargetObject: HKLM\System\CurrentControlSet\Services\Fax\ObjectName
21    filter:
22        Details|contains: NetworkService
23    condition: selection and not filter
24falsepositives:
25    - Unknown
26level: high

References

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