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Winrar Execution in Non-Standard Folder

Sigma Rules

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Summary
This detection rule identifies potential misuse of the WinRAR application when executed from a non-standard directory. Typically, WinRAR is installed in predefined directories such as 'C:\Program Files (x86)\WinRAR\' or 'C:\Program Files\WinRAR\'. Executions from other folders can indicate suspicious activity, such as malware using WinRAR to extract compressed files in atypical locations. The rule utilizes process creation logs to monitor the execution of WinRAR by filtering for instances where the image name ends with 'rar.exe' or 'winrar.exe' while excluding those that originate from the standard installation paths or from temporary folders. False positives may arise from legitimate software distributions that bundle WinRAR. The rule is critical for detecting potential file extraction operations that could be associated with adversarial activities.
Categories
  • Endpoint
  • Windows
Data Sources
  • Process
Created: 2021-11-17