Sigma rule: Binary Padding - Linux

Rule

Title

Binary Padding - Linux

Status

test

Level

high

Author

Igor Fits, oscd.community

Date

2020-10-13

Modified

2023-05-03

File

rules/linux/auditd/execve/lnx_auditd_binary_padding.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Adversaries may use binary padding to add junk data and change the on-disk representation of malware.
This rule detect using dd and truncate to add a junk data to file.

Log source

product

linux

service

auditd

Detection

selection_execve:
    type: 'EXECVE'
keywords_truncate:
    '|all':
        - 'truncate'
        - '-s'
keywords_dd:
    '|all':
        - 'dd'
        - 'if='
keywords_filter:
    - 'of='
condition: selection_execve and (keywords_truncate or (keywords_dd and not keywords_filter))

False positives (as the rule lists them)

• Unknown

Tags

• attack.stealth
• attack.t1027.001

MITRE ATT&CK ids this rule names

• T1027.001

References

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1027.001/T1027.001.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/auditd/execve/lnx_auditd_binary_padding.yml