Change the Fax Dll

calendar Oct 23, 2025 · attack.persistence attack.defense-evasion attack.t1112  ·
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Detect possible persistence using Fax DLL load when service restart

Sigma rule (View on GitHub)

 1title: Change the Fax Dll
 2id: 9e3357ba-09d4-4fbd-a7c5-ad6386314513
 3status: test
 4description: Detect possible persistence using Fax DLL load when service restart
 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|contains|all:
21            - '\Software\Microsoft\Fax\Device Providers\'
22            - '\ImageName'
23    filter:
24        Details: '%systemroot%\system32\fxst30.dll' # Windows 10
25    condition: selection and not filter
26falsepositives:
27    - Unknown
28level: high

References

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