DD File Overwrite

 1title: DD File Overwrite
 2id: 2953194b-e33c-4859-b9e8-05948c167447
 3status: test
 4description: Detects potential overwriting and deletion of a file using DD.
 5references:
 6    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1485/T1485.md#atomic-test-2---macoslinux---overwrite-file-with-dd
 7author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research), MSTIC
 8date: 2021/10/15
 9modified: 2022/07/07
10tags:
11    - attack.impact
12    - attack.t1485
13logsource:
14    product: linux
15    category: process_creation
16detection:
17    selection1:
18        Image:
19            - '/bin/dd'
20            - '/usr/bin/dd'
21    selection2:
22        CommandLine|contains: 'of='
23    selection3:
24        CommandLine|contains:
25            - 'if=/dev/zero'
26            - 'if=/dev/null'
27    condition: all of selection*
28falsepositives:
29    - Any user deleting files that way.
30level: low