2020-02-20 22:00:16 +00:00
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title: Overwriting the File with Dev Zero or Null
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2019-12-19 22:56:36 +00:00
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id: 37222991-11e9-4b6d-8bdf-60fbe48f753e
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2020-02-20 22:00:16 +00:00
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date: 2019/10/23
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2019-10-23 18:22:33 +00:00
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description: Detects overwriting (effectively wiping/deleting) the file
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author: Jakob Weinzettl, oscd.community
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tags:
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- attack.impact
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- attack.t1485
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logsource:
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product: linux
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2019-11-29 08:32:05 +00:00
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service: auditd
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2019-10-23 18:22:33 +00:00
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detection:
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2019-11-29 08:32:05 +00:00
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selection:
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type: 'EXECVE'
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2019-12-02 01:54:48 +00:00
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a0|contains: 'dd'
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a1|contains:
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2019-11-29 08:32:05 +00:00
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- 'if=/dev/null'
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- 'if=/dev/zero'
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condition: selection
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2019-10-23 18:22:33 +00:00
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falsepositives:
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2020-01-19 21:34:16 +00:00
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- Appending null bytes to files
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- Legitimate overwrite of files
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2019-10-23 18:22:33 +00:00
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level: low
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references:
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- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1485/T1485.yaml
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