PackmanV0001Bubbasoft

Hunt Hypothesis

This rule detects the presence of the PackmanV0001Bubbasoft component, which is often associated with specific software installations or potential supply chain artifacts that adversaries may leverage for persistence or initial access. Proactively hunting for this indicator in Azure Sentinel allows the SOC team to identify unexpected or unauthorized instances of this component across the environment, ensuring that low-severity anomalies are not overlooked before they can be exploited in a broader attack chain.

YARA Rule

rule PackmanV0001Bubbasoft
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 60 E8 00 00 00 00 58 8D [5] 8D [5] 8D [5] 8D [2] 48 }

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 DevOps engineer executes a scheduled PowerShell script to update internal CI/CD pipeline dependencies, where the Bubbasoft library is a transitive dependency in a NuGet package cache or local build folder.
  • Filter/Exclusion: Exclude events where the parent process is powershell.exe or pwsh.exe and the file path contains \nuget\ or \packages\, or where the script path resides in a known CI/CD workspace directory (e.g., C:\Jenkins\workspace\ or C:\AzureDevOps\).
• Scenario: An IT administrator runs a standard Windows Update or third-party patch management agent (e.g., SCCM, WSUS, or Chocolatey) that installs or updates a legacy application bundle containing the Bubbasoft component as part of a larger software suite.
  • Filter/Exclusion: Exclude events where the parent process is a known patch management service (e.g., ccmexec.exe, wuauclt.exe, choco.exe) or where the file path includes \Program Files\ and the parent process name matches a list of approved installers.
• Scenario: A QA or UAT team runs automated regression tests using a test harness (e.g., Selenium, Appium, or a custom .NET test runner) that loads the Bubbasoft library from a shared network drive or local test artifacts folder.
  • Filter/Exclusion: Exclude events where the file path contains \test\, \qa\, or \artifacts\, or where the parent process is a known test runner executable (e.g., vstest.console.exe, dotnet.exe with test argument, or java.exe for JVM-based tests).
• Scenario: A business user opens a legacy line-of