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Windows UAC Bypass via IDiagnosticProfileUAC Triggered from DllHost.exe

Flags elevated process creation where DllHost.exe launches using the specific IDiagnosticProfileUAC /Processid value.

FreeReviewedSigma · High · v1
Product
windows
Category
process_creation
Author
Nasreddine Bencherchali (Nextron Systems) (SigmaHQ), DRL 1.1
Published
2022-07-03
Updated
2026-07-30
AnalysisDetection

ATT&CK techniques

Priv Esc → Defense Evasion

  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 matches process creation events where DllHost.exe is the parent process running with a command line containing the specific /Processid argument and where the child process integrity level is High, System, or one of the listed High/System SIDs. UAC bypass attempts often rely on trusted system components to launch operations with elevated privileges, making this parent-child and integrity combination important for identifying escalation behavior. The detection relies on Windows process creation telemetry, including parent image, parent command line, and the integrity level or corresponding integrity SIDs reported for the created process.

Reporting behind it

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Malicious UAC Bypass via explorer.exe NOUACCHECK Argument
Suspicious UAC Bypass via ms-settings Shell Command Hijack (via registry_set)
Windows UAC Bypass via IDiagnosticProfileUAC Triggered from DllHost.exe
Pivot detection · T1548.002 · 9 related

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