Detectioninformationaltest

File and Directory Discovery - Linux

Detects usage of system utilities such as "find", "tree", "findmnt", etc, to discover files, directories and network shares.

Convert In Phoenix Studio

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

Launch

Daniil Yugoslavskiy, oscd.community, CheraghiMiladCreated Mon Oct 19Updated Sun Dec 01d3feb4ee-ff1d-4d3d-bd10-5b28a238cc72linux

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_file_with_asterisk:
        Image|endswith: '/file'
        CommandLine|re: '(.){200,}' # execution of the 'file */* *>> /tmp/output.txt' will produce huge commandline
    selection_recursive_ls:
        Image|endswith: '/ls'
        CommandLine|contains: '-R'
    selection_find_execution:
        Image|endswith: '/find'
    selection_tree_execution:
        Image|endswith: '/tree'
    selection_findmnt_execution:
        Image|endswith: '/findmnt'
    selection_locate_execution:
        Image|endswith: '/mlocate'
    condition: 1 of selection_*