ProtectSharewareV11eCompservCMS

Hunt Hypothesis

This YARA rule targets the ProtectSharewareV11eCompservCMS component, which is often associated with legacy or bundled shareware applications that may harbor outdated code or serve as a vector for supply chain compromises. Proactively hunting for this signature allows the SOC to identify potentially vulnerable or unmanaged software assets in the environment, reducing the risk of exploitation through known weaknesses in older commercial or freeware distributions.

YARA Rule

rule ProtectSharewareV11eCompservCMS
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 53 00 74 00 72 00 69 00 6E 00 67 00 46 00 69 00 6C 00 65 00 49 00 6E 00 66 00 6F 00 00 00 ?? 01 00 00 01 00 30 00 34 00 30 00 39 00 30 00 34 00 42 00 30 00 00 00 34 00 ?? 00 01 00 43 00 6F 00 6D 00 70 00 61 00 6E 00 79 00 4E 00 61 00 6D 00 65 00 00 00 00 }

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 specific false positive scenarios for the YARA rule ProtectSharewareV11eCompservCMS, along with suggested filters:

• Scenario: A developer or QA engineer runs the eCompservCMS application locally from a shared network drive (e.g., \\fileserver\apps\eCompservCMS\bin\) for testing purposes, rather than installing it via the standard MSI/EXE installer. The YARA rule may flag the binary or its associated DLLs as “shareware” or “unmanaged” because they reside outside the standard Program Files directory or lack the expected digital signature chain associated with the installed version.

  • Filter/Exclusion: Exclude processes where the ImageFileName matches eCompservCMS* AND the CommandLine contains a network path prefix (e.g., \\ or /) OR the ImagePath is located under a known development/test directory (e.g., C:\Dev\, D:\QA\, \\fileserver\apps\).

• Scenario: An IT administrator uses a third-party deployment tool (such as SCCM, Intune, or PDQ Deploy) to push the eCompservCMS update to a fleet of machines. The deployment agent (e.g., ccmexec.exe or PDQDeploy.exe) spawns a child process to execute the eCompservCMS installer or a helper script. The YARA rule might trigger on the parent-child relationship or the specific hash of the temporary installer binary if it differs from the final installed version.

  • Filter/Exclusion: Exclude detections where the ParentImageFileName is a known deployment agent (e.g., ccmexec.exe, PDQDeploy.exe, IntuneManagementExtension.exe) AND the ImageFileName matches `eCompservCMS*