Emerging Threathightest
BlueSky Ransomware Artefacts
Detect access to files and shares with names and extensions used by BlueSky ransomware which could indicate a current or previous encryption attempt.
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Launch
Emerging Threat
Active Threat
Developed to detect an active or emerging threat. Prioritize investigation of any alerts and correlate with threat intelligence.
Log Source
Windowssecurity
ProductWindows← raw: windows
Servicesecurity← raw: security
Detection Logic
Detection Logic4 selectors
detection:
selection_access_eid:
EventID:
- 4663
- 4656
selection_access_data:
- ObjectName|endswith: '.bluesky'
- ObjectName|contains: 'DECRYPT FILES BLUESKY'
selection_share_eid:
EventID: 5145
selection_share_data:
- RelativeTargetName|endswith: '.bluesky'
- RelativeTargetName|contains: 'DECRYPT FILES BLUESKY'
condition: all of selection_access_* or all of selection_share_*False Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
MITRE ATT&CK
Rule Metadata
Rule ID
eee8311f-a752-44f0-bf2f-6b007db16300
Status
test
Level
high
Type
Emerging Threat
Created
Tue May 23
Author
Path
rules-emerging-threats/2022/Malware/BlueSky-Ransomware/win_security_malware_bluesky_ransomware_files_indicators.yml
Raw Tags
attack.impactattack.t1486detection.emerging-threats