Detectionhightest

Binary Padding - Linux

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.

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Igor Fits, oscd.communityCreated Tue Oct 13Updated Wed May 03c52a914f-3d8b-4b2a-bb75-b3991e75f8balinux

Log Source

Linuxauditd

ProductLinux← raw: linux

Serviceauditd← raw: auditd

Detection Logic

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))