Armadillo430aSiliconRealmsToolworks

Hunt Hypothesis

This detection identifies the execution of the specific tool signature “Armadillo430aSiliconRealmsToolworks,” which may indicate an adversary leveraging custom or legitimate software for reconnaissance and lateral movement within the environment. Proactively hunting for this behavior in Azure Sentinel is essential to distinguish between routine administrative activity and potential early-stage threat actor operations that could otherwise remain undetected due to their low-severity classification.

YARA Rule

rule Armadillo430aSiliconRealmsToolworks
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 44 64 65 44 61 74 61 20 69 6E 69 74 69 61 6C 69 7A 65 64 20 28 41 4E 53 49 29 2C 20 61 70 70 20 73 74 72 69 6E 67 73 20 61 72 65 20 27 25 73 27 20 61 6E 64 20 27 25 73 27 00 00 00 44 64 65 44 61 74 61 20 69 6E 69 74 69 61 6C 69 7A 65 64 20 28 55 4E 49 43 }

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 Rule: Armadillo430aSiliconRealmsToolworks

• Scenario 1: Deployment of Silicon Realms’ Patch Management Suite

  • Context: The IT Operations team schedules a nightly deployment of the “Silicon Realms Update Manager” (version 4.2) to push security patches across the workstation fleet. This tool utilizes the Armadillo430a engine for signature verification, which matches the YARA rule’s core logic.
  • Suggested Filter/Exclusion: Exclude processes originating from the C:\Program Files\Silicon Realms\UpdateManager directory where the process name is SRUpdateService.exe and the parent process is TaskScheduler.exe.

• Scenario 2: Execution of Automated Compliance Auditing Scripts

  • Context: The Security Governance group runs a weekly compliance audit using “Armadillo430a Audit Tool” to scan file integrity on critical financial servers. The tool generates temporary log files and signature hashes that trigger the detection logic during its active scanning phase.
  • Suggested Filter/Exclusion: Create an exclusion for any process running under the user context DOMAIN\svc-compliance-audit where the command line contains parameters related to --mode=integrity-scan or --target=financial-repo.

• Scenario 3: Installation of Third-Party Endpoint Protection Agent

  • Context: During a major infrastructure upgrade, the System Administration team installs the “Silicon Realms Endpoint Guardian” agent on new virtual machines. The installer (Setup.exe) invokes the Armadillo430a component to validate the installation package before writing registry keys.
  • Suggested Filter/Exclusion: Exclude events where the process image path contains C:\Windows\Installer and the file hash matches the