Sigma rule: File and Directory Discovery - Linux

Rule

Title

File and Directory Discovery - Linux

Status

test

Level

informational

Author

Daniil Yugoslavskiy, oscd.community, CheraghiMilad

Date

2020-10-19

Modified

2024-12-01

File

rules/linux/process_creation/proc_creation_lnx_file_and_directory_discovery.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

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

Log source

product

linux

category

process_creation

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_*

False positives (as the rule lists them)

• Legitimate activities

Tags

• attack.discovery
• attack.t1083

MITRE ATT&CK ids this rule names

• T1083

References

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1083/T1083.md

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/linux/process_creation/proc_creation_lnx_file_and_directory_discovery.yml