Backup Files Deleted

 1title: Backup Files Deleted
 2id: 06125661-3814-4e03-bfa2-1e4411c60ac3
 3status: test
 4description: Detects deletion of files with extensions often used for backup files. Adversaries may delete or remove built-in operating system data and turn off services designed to aid in the recovery of a corrupted system to prevent recovery.
 5references:
 6    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1490/T1490.md#atomic-test-6---windows---delete-backup-files
 7author: frack113
 8date: 2022-01-02
 9modified: 2023-02-15
10tags:
11    - attack.impact
12    - attack.t1490
13logsource:
14    product: windows
15    category: file_delete
16detection:
17    selection:
18        Image|endswith:
19            - '\cmd.exe'
20            - '\powershell.exe'
21            - '\pwsh.exe'
22            - '\wt.exe'
23            - '\rundll32.exe'
24            - '\regsvr32.exe'
25        TargetFilename|endswith:
26            - '.VHD'
27            - '.bac'
28            - '.bak'
29            - '.wbcat'
30            - '.bkf'
31            - '.set'
32            - '.win'
33            - '.dsk'
34    condition: selection
35falsepositives:
36    - Legitime usage
37level: medium