Private exe Protector V30 V30X SetiSoft Team 20090215

Hunt Hypothesis

This hypothesis targets the presence of the Private EXE Protector V30, a legacy software protection tool that adversaries may use to obfuscate malicious executables or hide the true entry point of a payload. Proactively hunting for this specific signature in Azure Sentinel allows the SOC to identify potentially obfuscated binaries that standard static analysis might miss, ensuring that low-severity but high-impact obfuscation techniques are not overlooked in the environment.

YARA Rule

rule Private_exe_Protector_V30_V30X_SetiSoft_Team_20090215: PEiD
{
    strings:
        $a = { 00 2E ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 00 00 ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 00 00 E0 2E ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 00 00 ?? ?? ?? ?? ?? ?? 00 00 ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 00 00 00 E0 2E 72 73 72 63 00 00 00 00 ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 00 00 ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 40 00 00 40 }
    condition:
        $a 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 specific false positive scenarios for the YARA rule targeting Private exe Protector V30/V30X (SetiSoft Team 20090215), along with suggested filters:

• Legacy Internal Tooling with Embedded Protectors: Many older internal Windows applications (e.g., custom inventory scanners, legacy POS terminals, or niche engineering CAD plugins) developed between 2005–2012 often used SetiSoft’s Private Protector to obfuscate proprietary logic or protect license keys. These executables are frequently deployed via Group Policy Objects (GPO) to specific user groups or departmental servers.
  • Filter/Exclusion: Exclude files located in specific legacy application directories (e.g., C:\Program Files\LegacyInventory\, C:\Apps\InternalTools\) or exclude hashes of known stable internal tools that have been verified as benign by the application owners.
• Scheduled Maintenance Jobs for Third-Party Middleware: Some third-party middleware or database maintenance utilities (e.g., specific versions of older SAP connectors, legacy ETL scripts, or proprietary backup agents) may bundle their helper executables using this protector to prevent reverse engineering. These are often triggered by Windows Task Scheduler or cron-like jobs on application servers.
  • Filter/Exclusion: Exclude processes or files where the parent process is a known service executable (e.g., svchost.exe running a specific service, or a known application service like sqlagent.exe or backupsvc.exe) and the file path resides in the vendor’s standard installation directory (e.g., C:\Program Files\VendorName\Bin\).
• Older Game Launchers or DRM Components: While less common in enterprise, some older desktop applications, educational software, or even specific game launchers (e.g., older versions of Steam, Battle.net, or niche simulation software) used this