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MediumElastic detection rulesElastic

Potential PowerShell Obfuscation via String Reordering

Detects PowerShell scripts that uses format placeholders like "{0}{1}" with the -f operator or ::Format to reorder strings at runtime. Attackers use format-based reconstruction to hide commands or payload strings and…

Description

Detects PowerShell scripts that uses format placeholders like "{0}{1}" with the -f operator or ::Format to reorder strings at runtime. Attackers use format-based reconstruction to hide commands or payload strings and evade static analysis and AMSI.

Detection logic

Its licence does not clear it for publishing here

Sunturai publishes a detection's own text where the licence it arrived under has been reviewed and permits it, and Elastic License 2.0 has not. The query as its source wrote it, its canonical form and the hash that pins this revision are in the workspace record.

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Detection requirements

Platform
ContainersESXiIaaSIdentity ProviderLinuxmacOSNetwork DevicesOffice SuiteSaaSWindows

The rule states no platform. This is derived from the 3 ATT&CK techniques it maps to.

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