Detectionmediumtest

Invoke-Obfuscation COMPRESS OBFUSCATION

Detects Obfuscated Powershell via COMPRESS OBFUSCATION

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Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

Launch

Timur Zinniatullin, oscd.communityCreated Sun Oct 18Updated Thu Dec 297eedcc9d-9fdb-4d94-9c54-474e8affc0c7windows

Log Source

WindowsProcess Creation

ProductWindows← raw: windows

CategoryProcess Creation← raw: process_creation

Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.

Detection Logic

detection:
    selection:
        CommandLine|contains|all:
            - 'new-object'
            - 'text.encoding]::ascii'
        CommandLine|contains:
            - 'system.io.compression.deflatestream'
            - 'system.io.streamreader'
            - 'readtoend('
    condition: selection