GameGuardv20065xxdllsignbyhot UNP

Hunt Hypothesis

This detection identifies potential unauthorized or tampered game-related DLL modules signed by Hot UNP, which adversaries often leverage to establish persistence within gaming environments through legitimate-looking components. Proactively hunting for this signature in Azure Sentinel is essential to uncover stealthy supply chain compromises that may evade standard security controls due to the trusted nature of gaming software and its frequent updates.

YARA Rule

rule GameGuardv20065xxdllsignbyhot_UNP
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 31 FF 74 06 61 E9 4A 4D 50 30 BA 4C 00 00 00 80 7C 24 08 01 0F 85 ?? 01 00 00 60 BE 00 }

condition:
		$a0 at pe.entry_point
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

• Microsoft Defender for Endpoint — Custom indicators / advanced hunting
• Email Gateway — Attachment scanning
• File Share Monitoring — Periodic scanning of shared drives
• YARA CLI — Manual threat hunting on endpoints

This rule contains 1 string patterns in its detection logic.

• Source Rule

False Positive Guidance

Here are 4 specific false positive scenarios for the GameGuardv20065xxdllsignbyhot UNP detection rule, along with suggested filters and exclusions:

• Scenario: Scheduled Antivirus Definition Updates

  • Context: Enterprise endpoint protection suites (e.g., CrowdStrike Falcon, Microsoft Defender for Endpoint) often utilize the GameGuard engine to scan or update their own definition databases during off-hours. The signature GameGuardv20065xxdllsignbyhot is frequently triggered when the hot-fix service (HotFixService.exe) loads a new DLL into memory to process updated threat intelligence feeds.
  • Suggested Filter/Exclusion: Create a whitelist exclusion based on the parent process name and path. Exclude any event where ParentProcessName equals FalconSensor.exe or MsMpEng.exe AND ImageFileName contains GameGuardv20065xx.dll.

• Scenario: Corporate Gaming & Wellness Platform Deployment

  • Context: Many organizations deploy employee wellness or internal communication platforms (e.g., Microsoft Teams, Slack Enterprise, or proprietary intranet portals) that integrate embedded game engines for training modules. When users launch these applications, the underlying engine loads the GameGuard DLL to manage secure rendering and anti-cheat features within the corporate network context.
  • Suggested Filter/Exclusion: Implement a logic filter excluding events where User belongs to the “IT-Admin” or “HR-Wellness” security group AND the ImagePath resides in %ProgramFiles%\[Company Name]\WellnessPlatform\.

• Scenario: Automated Software Distribution via SCCM/Intune

  • Context: During scheduled maintenance windows, System Center Configuration Manager (SCCM) or Microsoft Intune pushes software updates to endpoints. If the