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Potential Defense Evasion Activity Via Emoji Usage In CommandLine - 3

Sigma Rules

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Summary
This detection rule focuses on identifying unusual behaviors associated with command line activity in a Windows environment, specifically targeting the presence of emoji characters within the command line arguments. The use of emojis in command line execution may indicate attempts by malicious actors to evade traditional security measures, as these characters could be employed to obfuscate malicious commands or scripts. The detection mechanism uses a selection process to flag any command lines that include a vast range of emoji characters specified in the `CommandLine|contains` filter. Given that emojis are not typically used in legitimate command operations, their occurrence can be a strong indicator of potentially harmful or unauthorized activity. The rule is still in the testing phase, highlighting the need for ongoing evaluation to balance sensitivity and accuracy in threat detection.
Categories
  • Windows
  • Endpoint
Data Sources
  • Command
Created: 2022-12-05