huntrule

Windows Registry: Disabling Antivirus Filter Driver on Dev Drive via FltmgrDevDriveAllowAntivirusFilter

Detects registry changes disabling antivirus minifilter inspection on a Dev Drive by setting the allow setting to 0x0.

FreeReviewedSigma · High · v1
Product
windows
Category
registry_set
Author
@kostastsale, Nasreddine Bencherchali (Nextron Systems) (SigmaHQ), DRL 1.1
Published
2023-11-05
Updated
2026-07-30
AnalysisDetection

ATT&CK techniques

  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Execution

  5. Persistence

  6. Priv Esc

  7. Defense Evasion

  8. Cred Access

  9. Discovery

  10. Lateral Movement

  11. Collection

  12. C2

  13. Exfiltration

  14. Impact

What it detects

This rule flags a registry write that sets the Dev Drive antivirus filter allow setting to DWORD 0x00000000 under the FilterManager FltmgrDevDriveAllowAntivirusFilter path. Disabling this capability can impair security monitoring by preventing antivirus minifilters from inspecting a Dev Drive. It relies on Windows registry set telemetry capturing the TargetObject and the Details value being written.

Reporting behind it

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Suspicious In-Memory PowerShell Execution from Web Server via Automation Assembly (via image_load)
Malicious EDR Evasion Driver Load from AnyDesk Directory via k.sys (via image_load)
Malicious Zemana Vulnerable Driver Load for EDR Termination (via image_load)
Windows Registry: Disabling Antivirus Filter Driver on Dev Drive via FltmgrDevDriveAllowAntivirusFilter
Pivot detection · T1685 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.