Threat Actor Profile
Low
Cybercriminal
Description
According to PCrisk, Rook is ransomware (an updated variant of Babuk) that prevents victims from accessing/opening files by encrypting them. It also modifies filenames and creates a text file/ransom note (HowToRestoreYourFiles.txt). Rook renames files by appending the .Rook extension. For example, it renames 1.jpg to 1.jpg.Rook, 2.jpg to 2.jpg.Rook.
Confidence Score
Tags
ransomware
ransomware.live
First Seen
Unknown
Last Updated
Unknown
Active Status
ActiveCreated
April 29, 2026
Indicators of Compromise
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IOC KQL for Sentinel
STIX Data
{'added_date': None,
'client': '2003264@sit.singaporetech.edu.sg',
'description': 'According to PCrisk, Rook is ransomware (an updated variant '
'of Babuk) that prevents victims from accessing/opening files '
'by encrypting them. It also modifies filenames and creates a '
'text file/ransom note (HowToRestoreYourFiles.txt). Rook '
'renames files by appending the .Rook extension. For example, '
'it renames 1.jpg to 1.jpg.Rook, 2.jpg to 2.jpg.Rook.',
'firstseen': '2021-12-07T07:01:24.544098+00:00',
'group': 'rook',
'has_negotiations': False,
'has_ransomnote': True,
'lastseen': '2022-01-08T10:19:00.640637+00:00',
'locations': [{'available': False,
'fqdn': 'gamol6n6p2p4c3ad7gxmx3ur7wwdwlywebo2azv3vv5qlmjmole2zbyd.onion',
'slug': 'http://gamol6n6p2p4c3ad7gxmx3ur7wwdwlywebo2azv3vv5qlmjmole2zbyd.onion',
'title': 'We Are Rook!!!',
'type': 'DLS'}],
'negotiation_count': 0,
'ransomnotes_count': 1,
'tiaras_metadata': {'has_negotiations': False,
'has_ransomnote': True,
'locations': [{'available': False,
'fqdn': 'gamol6n6p2p4c3ad7gxmx3ur7wwdwlywebo2azv3vv5qlmjmole2zbyd.onion',
'slug': 'http://gamol6n6p2p4c3ad7gxmx3ur7wwdwlywebo2azv3vv5qlmjmole2zbyd.onion',
'title': 'We Are Rook!!!',
'type': 'DLS'}],
'negotiation_count': 0,
'ransomnotes_count': 1,
'ransomware_live_group': 'rook',
'tools': {},
'url': 'https://www.ransomware.live/group/rook',
'victims': 9,
'vulnerabilities': []},
'tiaras_source': 'ransomware.live',
'tools': {},
'ttps': [],
'url': 'https://www.ransomware.live/group/rook',
'victims': 9,
'vulnerabilities': []}