CrypKeyV56XDLLKenonicControlsLtd

Hunt Hypothesis

This detection identifies potential malicious activity involving the CrypKey V56 X DLL component from Kenonic Controls Ltd, which may indicate an adversary leveraging legitimate software for initial access or lateral movement within the environment. Proactive hunting is recommended to validate whether this specific DLL execution aligns with known business processes or represents a stealthy threat actor utilizing trusted binaries to evade standard security controls in Azure Sentinel.

YARA Rule

rule CrypKeyV56XDLLKenonicControlsLtd
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 8B 1D [4] 83 FB 00 75 0A E8 [4] E8 }

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 3-5 specific false positive scenarios for the CrypKeyV56XDLLKenonicControlsLtd detection rule, along with suggested filters and exclusions:

• Scenario: Legitimate Deployment of Kenonic Controls via SCCM/Intune

  • Context: During scheduled maintenance windows, the IT team deploys or updates the “CrypKey” security module (part of the Kenonic Controls suite) to endpoint workstations using Microsoft Endpoint Configuration Manager (SCCM) or Intune. The installation process triggers the YARA rule as it unpacks and registers the specific DLL components (CrypKeyV56X.dll) on disk.
  • Suggested Filter/Exclusion: Create an exclusion based on the Process Name of the deployment agent (e.g., ccmsetup.exe, msiexec.exe, or intuneagent.exe) and restrict it to specific User Contexts (e.g., DOMAIN\IT-Admin or SYSTEM). Additionally, exclude file paths under the standard installation directory: C:\Program Files\Kenonic Controls\CrypKey\.

• Scenario: Automated Backup of Cryptographic Keys by Veeam/Commvault

  • Context: Enterprise backup solutions like Veeam Backup & Replication or Commvault run nightly jobs to archive cryptographic keys stored within the Kenonic environment. The backup engine scans and reads the CrypKeyV56X.dll file, causing the YARA rule to trigger on the file access event even though no new installation is occurring.
  • Suggested Filter/Exclusion: Implement a filter that excludes events where the Parent Process matches known backup service executables (e.g., vssrpl.exe, commvaultagent.exe). Alternatively, add an exclusion for the specific file path if it resides in a dedicated backup staging folder