huntrule

Windows Defender windefend Event 1119 flags RedSun TieringEngineService.exe EICAR test file

Alerts on WinDefend 1119 remediation failures involving TieringEngineService.exe marked with EICAR content or triggered by RedSun.exe.

FreeReviewedSigma · Critical · v5
Product
windows
Service
windefend
Author
Swachchhanda Shrawan Poudel (Nextron Systems) (SigmaHQ), DRL 1.1
Published
2026-04-17
Updated
2026-07-31
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 flags Windows Defender real-time protection events (EventID 1119) where remediation fails for TieringEngineService.exe staged in a temporary RS-{GUID} directory with an EICAR test filename indicator, or when RedSun.exe is present. Attackers may use this kind of staging and scanning-race behavior to interfere with or bypass security controls and pivot into execution. The detection relies on windefend telemetry capturing EventID 1119 along with the file path, ThreatName ending in EICAR_Test_File, and/or process name ending in RedSun.exe.

Reporting behind it

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Malicious StyleSmuggler (CVE-2026-75650) Post-Exploitation Implant Process (via process_creation)
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Windows Defender windefend Event 1119 flags RedSun TieringEngineService.exe EICAR test file
Pivot detection · T1036.005 · 9 related

Changelog

v5
  1. v5
    Candidate ingested via manual entry.2026-07-31
  2. v4
    Candidate ingested via manual entry.2026-07-31
  3. v3
    Candidate ingested via manual entry.2026-07-31
  4. v2
    Candidate ingested via manual entry.2026-07-31
  5. v1
    No changelog recorded for this version.2026-07-30

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