ISO File Write to Suspicious Folder (RedCanary Threat Detection Report)

 1title: ISO File Write to Suspicious Folder (RedCanary Threat Detection Report)
 2id: bedf5cac-6332-4463-98ab-818f9e31234c
 3status: experimental
 4description: Detects files written to user downloads folder or appdata folder, associated with Mark-of-the-Web Bypass. Part of the RedCanary 2023 Threat Detection Report.
 5references:
 6    - https://redcanary.com/threat-detection-report/techniques/mark-of-the-web-bypass/
 7author: RedCanary, Sigma formatting by Micah Babinski
 8date: 2023/05/10
 9tags:
10    - attack.defense_evasion
11    - attack.t1553.005
12logsource:
13    category: file_event
14    product: windows
15detection:
16    selection_iso:
17        TargetFilename|endswith: '.iso'
18    selection_user_downloads:
19        TargetFilename|contains|all:
20            - 'Users'
21            - 'Downloads'
22    selection_appdata:
23        TargetFilename|contains: 'appdata'
24    condition: selection_iso and (selection_user_downloads or selection_appdata)
25falsepositives:
26    - Unknown
27level: low```