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VMMap Signed Dbghelp.DLL Potential Sideloading

Sigma Rules

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Summary
The detection rule targets potential DLL sideloading exploits involving the signed dbghelp.dll file when loaded by the Sysinternals tool VMMap. DLL sideloading is a technique commonly used by attackers to execute malicious payloads by leveraging legitimate signed DLL files that may be altered or replaced. In this scenario, the rule specifically detects instances where the image loaded contains the path to 'C:\Debuggers\dbghelp.dll', and the image ends with either 'vmmap.exe' or 'vmmap64.exe', indicating usage of the VMMap utility. The condition is met when these specific criteria are satisfied, indicating possible malicious activity. The use of VMMap alongside this DLL can suggest attempts to evade detection mechanisms and escalate privileges by executing code in an unauthorized manner. This rule functions under Windows operating systems and utilizes log source categories related to image load events.
Categories
  • Windows
  • Endpoint
  • Application
Data Sources
  • Image
Created: 2023-09-05