NTkrnlSecureSuiteNTkrnlteam

Hunt Hypothesis

This detection identifies potential kernel-level security suite anomalies or unauthorized modifications within the Windows NT kernel environment that may indicate stealthy adversary activity. A proactive hunt is essential in Azure Sentinel to validate these low-severity signals against known benign patterns and uncover sophisticated threats that evade standard signature-based defenses by operating deep within the OS kernel.

YARA Rule

rule NTkrnlSecureSuiteNTkrnlteam
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 34 10 00 00 28 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 41 10 00 00 50 10 00 00 00 00 00 00 4B 65 72 6E 65 6C 33 32 2E 64 6C 6C 00 00 00 4C 6F 61 64 4C 69 62 72 61 72 79 41 00 00 00 47 65 74 50 72 6F 63 41 64 64 72 65 73 73 }

condition:
		$a0
}

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

False Positive Scenarios for NTkrnlSecureSuiteNTkrnlteam

• Scenario 1: Microsoft Defender for Endpoint Real-Time Protection Updates

  • Context: The rule may trigger when the Microsoft Defender Antivirus service (AntimalwareService) performs a scheduled definition update or scans the system drive. This process often loads kernel-mode components that match the signature of NTkrnlSecureSuite.
  • Suggested Filter/Exclusion: Add an exclusion for the executable path C:\Program Files\Microsoft Defender Antivirus\bin\MsMpEng.exe and its child processes, specifically filtering events where the parent process is MsMpEng.exe.

• Scenario 2: System Center Configuration Manager (SCCM) Application Deployment

  • Context: During a scheduled application deployment or patching cycle via SCCM (ccmexec.exe), the system may load kernel extensions to manage driver updates or security policies. This activity often mimics the behavior of the NTkrnlSecureSuite team components.
  • Suggested Filter/Exclusion: Create an exclusion based on the parent process name ccmexec.exe and the command line containing keywords like “AppDeployment” or “SoftwareUpdate”, excluding events occurring during maintenance windows (e.g., 02:00–04:00).

• Scenario 3: Third-Party Endpoint Detection and Response (EDR) Agent Initialization

  • Context: Legitimate EDR agents such as CrowdStrike Falcon (FalconSensorService.exe) or SentinelOne (S1Agent.exe) frequently inject kernel drivers upon system boot or service restart. These injections can be misidentified as the NTkrnlSecureSuite activity by the YARA rule.
  • Suggested Filter/Exclusion: Implement a whitelist for known EDR executables (e.g