Sigma rule: Tamper With Sophos AV Registry Keys

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-75ec47b1cd6f, updated 2023-08-17T00:00:00.000Z.

Rule

Title
Tamper With Sophos AV Registry Keys
Status
test
Level
high
Author
Nasreddine Bencherchali (Nextron Systems)
Date
2022-09-02
Modified
2023-08-17
File
rules/windows/registry/registry_set/registry_set_sophos_av_tamper.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects tamper attempts to sophos av functionality via registry key modification

Log source

product
windows
category
registry_set

Detection

selection:
    TargetObject|contains:
        - '\Sophos Endpoint Defense\TamperProtection\Config\SAVEnabled'
        - '\Sophos Endpoint Defense\TamperProtection\Config\SEDEnabled'
        - '\Sophos\SAVService\TamperProtection\Enabled'
    Details: DWORD (0x00000000)
condition: selection

False positives (as the rule lists them)

  • Some FP may occur when the feature is disabled by the AV itself, you should always investigate if the action was legitimate

Tags

  • attack.defense-impairment
  • attack.t1685

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_sophos_av_tamper.yml

Sources and licences

  • SigmaHQ

    "Tamper With Sophos AV Registry Keys" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/registry/registry_set/registry_set_sophos_av_tamper.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: Tamper With Sophos AV Registry Keys",
entity page, dataset version ref-75ec47b1cd6f, updated 2023-08-17T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/9f4662ac-17ca-43aa-8f12-5d7b989d0101 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 9f4662ac-17ca-43aa-8f12-5d7b989d0101, 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.