The Rook ransomware group is a relatively minor threat actor that emerged in late 2021, operating with apparent financial motivations through ransomware deployment and extortion activities. The group's origin and affiliations remain largely undocumented in public threat intelligence reporting, with limited information available about their operational structure or potential connections to other cybercriminal organizations. Based on available data, Rook has demonstrated a focused targeting approach primarily against entities within the United States, though specific details about their initial access vectors, technical capabilities, and operational methodologies have not been extensively documented by major security firms or government agencies. The group's relatively small victim count of nine documented cases suggests either limited operational capacity, a selective targeting approach, or potentially short operational windows between campaigns. Given the limited public documentation from established threat intelligence sources like CISA, FBI, or major security vendors, Rook appears to represent a lower-tier ransomware operation with restricted scope and impact compared to more prominent ransomware families, and their current operational status remains unclear due to insufficient public reporting on their recent activities. The group has been linked to 9 public disclosures across our corpus. First observed on a leak site on December 7, 2021; most recent post January 8, 2022. The operation is currently inactive.
Sector and geography
Geographically, KMG Prestige, Inc. is reported in United States, a country with 11,033 ransomware disclosures in our corpus.
If your organisation is affected
A listing by Rook means KMG Prestige, Inc. appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.
- Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
- Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
- Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
- Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
- Monitor for the data appearing on Rook's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.
How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.
