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36 lines
1.2 KiB
YAML
36 lines
1.2 KiB
YAML
title: 'Binary Padding'
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id: c52a914f-3d8b-4b2a-bb75-b3991e75f8ba
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status: experimental
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description: '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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# For this rule to work execve auditing / file system auditing with "execute access" to specific binaries must be configured
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# Example config (place it at the bottom of audit.rules)
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# -a always,exit -F arch=b32 -S execve -k execve
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# -a always,exit -F arch=b64 -S execve -k execve
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author: 'Igor Fits, oscd.community'
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date: 2020/10/13
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references:
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- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1027.001/T1027.001.md
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logsource:
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product: linux
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service: auditd
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detection:
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selection1:
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type: 'EXECVE'
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keywords|contains|all:
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- 'truncate'
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- '-s'
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selection2:
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type: 'EXECVE'
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keywords|contains|all:
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- 'dd'
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- 'if='
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filter:
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keywords|contains: 'of='
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condition: selection1 or (selection2 and not filter)
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falsepositives:
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- 'Legitimate script work'
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level: high
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tags:
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- attack.defense_evasion
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- attack.t1027.001
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