Sigma rule: Change the Fax Dll

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-1f03a5d94dc4, updated 2022-12-30T00:00:00.000Z.

Rule

Title
Change the Fax Dll
Status
test
Level
high
Author
frack113
Date
2022-07-17
Modified
2022-12-30
File
rules/windows/registry/registry_set/registry_set_fax_dll_persistance.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detect possible persistence using Fax DLL load when service restart

Log source

product
windows
category
registry_set

Detection

selection:
    TargetObject|contains|all:
        - '\Software\Microsoft\Fax\Device Providers\'
        - '\ImageName'
filter:
    Details: '%systemroot%\system32\fxst30.dll' # Windows 10
condition: selection and not filter

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.persistence
  • attack.defense-impairment
  • attack.t1112

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/registry/registry_set/registry_set_fax_dll_persistance.yml

Sources and licences

  • SigmaHQ

    "Change the Fax Dll" by frack113 (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/registry/registry_set/registry_set_fax_dll_persistance.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Change the Fax Dll",
entity page, dataset version ref-1f03a5d94dc4, updated 2022-12-30T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/9e3357ba-09d4-4fbd-a7c5-ad6386314513 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 9e3357ba-09d4-4fbd-a7c5-ad6386314513, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.