Detectionmediumtest

Suspicious IIS URL GlobalRules Rewrite Via AppCmd

Detects usage of "appcmd" to create new global URL rewrite rules. This behaviour has been observed being used by threat actors to add new rules so they can access their webshells.

Convert In Phoenix Studio

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

Launch

Nasreddine Bencherchali (Nextron Systems)Created Sun Jan 227c8af9b2-dcae-41a2-a9db-b28c288b5f08windows

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_img:
        - Image|endswith: '\appcmd.exe'
        - OriginalFileName: 'appcmd.exe'
    selection_cli:
        CommandLine|contains|all:
            - 'set'
            - 'config'
            - 'section:system.webServer/rewrite/globalRules'
            - 'commit:'
    condition: all of selection_*