huntrule

Windows reg.exe Used to Modify Security Service Start Parameters

Flags reg.exe registry changes that target Start parameters for common security and Windows Defender-related services.

FreeReviewedSigma · High · v1
Product
windows
Category
process_creation
Author
Florian Roth (Nextron Systems), John Lambert (idea), elhoim (SigmaHQ), DRL 1.1
Published
2021-07-14
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 identifies process executions where reg.exe is run with arguments consistent with adding registry configuration to alter the Start value for multiple security-related Windows services. Disabling or changing service start types can impair host defenses by preventing security components from starting. The detection relies on Windows process creation telemetry, specifically command-line contents matching reg.exe usage patterns and targeted service name substrings.

Reporting behind it

Related detections9 linkedT1685 — drag to rearrange
Suspicious Windows Defender Exclusion of User Profile via PowerShell (via process_creation)
Malicious Vulnerable Driver Service Creation for BYOVD (via process_creation)
Malicious Microsoft Defender Disabled via Registry DisableAntiSpyware (via process_creation)
Suspicious Termination of Defender Tray Process via Taskkill
Malicious Windows Defender Disablement via MpCmdRun RemoveDefinitions
Malicious Unsigned VIB Installation on ESXi Host via esxcli (via process_creation)
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 reg.exe Used to Modify Security Service Start Parameters
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.