NTkrnlSecureSuite01015DLLNTkrnlSoftware

Hunt Hypothesis

This detection identifies potential kernel-level threats by monitoring for specific DLL loading behaviors associated with the NTkrnlSecureSuite01015 component within the Windows environment. Proactively hunting for this signal in Azure Sentinel allows the SOC team to validate legitimate system updates against anomalous kernel module injections that could indicate early-stage supply chain compromises or stealthy rootkit activity.

YARA Rule

rule NTkrnlSecureSuite01015DLLNTkrnlSoftware
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 00 00 00 00 00 00 00 00 00 00 00 00 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 [8] 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 00 8B 44 24 04 05 [4] 50 E8 01 00 00 00 C3 C3 }

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

Here are 4 specific false positive scenarios for the NTkrnlSecureSuite01015DLLNTkrnlSoftware detection rule, including suggested filters and exclusions:

• Scenario: Microsoft Defender Antivirus Scheduled Scans

  • Context: The Windows Security service (AntimalwareService) initiates a full or quick scan during business hours. This process often loads the ntkrnl.exe kernel module to interact with the Secure Suite DLL for real-time protection checks, triggering the rule even though it is expected behavior.
  • Suggested Filter/Exclusion: Create an exclusion based on the parent process name and user context.
    • Filter: Exclude events where ParentProcessName equals MsMpEng.exe (Microsoft Defender) AND UserName contains \SYSTEM.

• Scenario: System Patch Deployment via WSUS or SCCM

  • Context: During the installation of Windows Updates or third-party patches, the Configuration Manager client (ccmexec.exe) or the Update Orchestrator Service modifies kernel-level security configurations. This activity invokes the ntkrnl interaction with the Secure Suite DLL to verify integrity before applying changes.
  • Suggested Filter/Exclusion: Exclude processes known for patch management running under specific scheduled tasks.
    • Filter: Exclude events where ProcessName is in (ccmexec.exe, Wuauserv.exe) AND CommandLine contains “Install” or “Update”.

• Scenario: Endpoint Detection and Response (EDR) Heartbeat

  • Context: Enterprise EDR agents like CrowdStrike Falcon, Carbon Black, or SentinelOne frequently inject hooks into the kernel to monitor system calls. Their background services periodically communicate with the ntkrnl module via the Secure Suite DLL to report status or update policies, mimicking the signature of a potential