Detectionhightest

Inline Python Execution - Spawn Shell Via OS System Library

Detects execution of inline Python code via the "-c" in order to call the "system" function from the "os" library, and spawn a shell.

Convert In Phoenix Studio

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

Launch

Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.)Created Mon Sep 022d2f44ff-4611-4778-a8fc-323a0e9850cclinux

Log Source

LinuxProcess Creation

ProductLinux← raw: linux

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:
              - '/python'
              - '/python2'
              - '/python3'
        - Image|contains:
              - '/python2.'  # python image is always of the form ../python3.10; ../python is just a symlink
              - '/python3.'
    selection_cli:
        CommandLine|contains|all:
            - ' -c '
            - 'os.system('
        CommandLine|contains:
            - '/bin/bash'
            - '/bin/dash'
            - '/bin/fish'
            - '/bin/sh'
            - '/bin/zsh'
    condition: all of selection_*