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Potential Commandline Obfuscation Using Escape Characters

Sigma Rules

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Summary
This detection rule targets potential command line obfuscation techniques employed by attackers to evade detection on Windows systems. It specifically looks for the presence of known escape characters in the command line arguments used during process creation. Attackers often obfuscate the command line input by using escape characters to disguise malicious URLs or commands, such as replacing 'http' with 'h^t^t^p' or 'h"t"t"p'. By detecting these patterns, the rule aims to flag potentially suspicious activities that may indicate a defense evasion tactic. The rule operates under medium severity, indicating that while it does not immediately signify a confirmed compromise, it warrants further investigation. The detection mechanism is implemented using the 'process_creation' category, which forms part of the broader detection framework within the Windows environment. This adds a layer of specificity useful for responding to particular threats that rely on common obfuscation techniques. Documentation and community references related to the identification of such obfuscation strategies are provided to further enhance understanding and response capabilities.
Categories
  • Windows
  • Endpoint
  • Application
Data Sources
  • Process
Created: 2018-12-11