Potential Ransomware Activity Using LegalNotice Message

 1title: Potential Ransomware Activity Using LegalNotice Message
 2id: 8b9606c9-28be-4a38-b146-0e313cc232c1
 3status: test
 4description: Detect changes to the "LegalNoticeCaption" or "LegalNoticeText" registry values where the message set contains keywords often used in ransomware ransom messages
 5references:
 6    - https://github.com/redcanaryco/atomic-red-team/blob/5c1e6f1b4fafd01c8d1ece85f510160fc1275fbf/atomics/T1491.001/T1491.001.md
 7author: frack113
 8date: 2022-12-11
 9modified: 2023-08-17
10tags:
11    - attack.impact
12    - attack.t1491.001
13logsource:
14    product: windows
15    category: registry_set
16detection:
17    selection:
18        TargetObject|contains:
19            - '\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\LegalNoticeCaption'
20            - '\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\LegalNoticeText'
21        Details|contains:
22            - 'encrypted'
23            - 'Unlock-Password'
24            - 'paying'
25    condition: selection
26falsepositives:
27    - Unknown
28level: high
29simulation:
30    - type: atomic-red-team
31      name: Configure LegalNoticeCaption and LegalNoticeText registry keys to display ransom message
32      technique: T1491.001
33      atomic_guid: ffcbfaab-c9ff-470b-928c-f086b326089b
34regression_tests_path: regression_data/rules/windows/registry/registry_set/registry_set_legalnotice_susp_message/info.yml