Detectionhightest
Potential Ransomware Activity Using LegalNotice Message
Detect changes to the "LegalNoticeCaption" or "LegalNoticeText" registry values where the message set contains keywords often used in ransomware ransom messages
Convert In Phoenix Studio
Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.
Launch
Log Source
WindowsRegistry Set
ProductWindows← raw: windows
CategoryRegistry Set← raw: registry_set
Detection Logic
Detection Logic1 selector
detection:
selection:
TargetObject|contains:
- '\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\LegalNoticeCaption'
- '\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\LegalNoticeText'
Details|contains:
- 'encrypted'
- 'Unlock-Password'
- 'paying'
condition: selectionFalse Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
References
MITRE ATT&CK
Tactics
Sub-techniques
Rule Metadata
Rule ID
8b9606c9-28be-4a38-b146-0e313cc232c1
Status
test
Level
high
Type
Detection
Created
Sun Dec 11
Modified
Thu Aug 17
Author
Path
rules/windows/registry/registry_set/registry_set_legalnotice_susp_message.yml
Raw Tags
attack.impactattack.t1491.001