Invoke-Obfuscation COMPRESS OBFUSCATION via Service Creation

SigmaHQ Detections@sigmaHQ

•updated Aug 12, 2024•1•0•19

This rule detects the creation of a new Windows service (EventID 4697) where the service's file name contains specific PowerShell commands indicative of Invoke-Obfuscation's COMPRESS OBFUSCATION technique. Specifically, it looks for the presence of 'new-object', 'text.encoding]::ascii', 'readtoend', and either 'system.io.compression.deflatestream' or 'system.io.streamreader'. This combination suggests an attempt to decompress and execute obfuscated PowerShell code.