ExeShieldProtectorV36wwwexeshieldcom

Hunt Hypothesis

This hypothesis targets the presence of executables packed or protected by ExeShield, a commercial software protection tool often leveraged by adversaries to obscure malicious code and evade static analysis. Proactively hunting for this indicator in Azure Sentinel allows the SOC to identify potential low-severity threats or benign applications that may be hiding suspicious payloads within protected binaries across the environment.

YARA Rule

rule ExeShieldProtectorV36wwwexeshieldcom
{
      meta:
		author="malware-lu"
strings:
		$a0 = { B8 [3] 00 50 64 FF 35 00 00 00 00 64 89 25 00 00 00 00 33 C0 89 08 50 45 43 6F 6D 70 61 63 74 32 00 CE 1E 42 AF F8 D6 CC }

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

• Scenario: A developer or DevOps engineer manually downloads the ExeShield protector tool (v3.6) from the vendor website (www.exeshield.com) to protect a custom .NET assembly or C++ binary before deployment. The YARA rule matches the specific version string or header signature of the downloaded executable.
  • Filter/Exclusion: Exclude files located in specific development directories (e.g., C:\Users\<User>\Projects\, C:\Builds\) or exclude processes spawned by known IDEs (e.g., devenv.exe, code.exe) if the file is opened for inspection rather than executed as a standalone service.
• Scenario: A legacy application installer or a specific vendor’s update utility (e.g., a proprietary ERP or CAD software updater) bundles the ExeShield protector as part of its installation payload to protect its core components. The protector binary is extracted to a temporary folder (%TEMP% or %LOCALAPPDATA%\Temp) and executed briefly during the installation process.
  • Filter/Exclusion: Exclude files with paths containing \Temp\ or \Temporary\ that are spawned by known parent installers (e.g., msiexec.exe, setup.exe, install.exe) and have a short runtime duration (< 60 seconds).
• Scenario: A scheduled maintenance job or a custom PowerShell script used by the IT team to re-protect or verify the integrity of protected executables in a shared network drive or application server. The ExeShield tool is invoked via command line to scan or re-apply protection headers.
  • Filter/Exclusion: Exclude processes where the parent process is powershell.exe or cmd.exe and the command line arguments contain keywords like verify, scan, or protect, or exclude files located in specific administrative tool