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Inactive · #224 by victimsRansomware group

Rook

As of Oct 19, 2026, Rook has listed 9 confirmed victims on its leak site since Jul 11, 2025, 0.0% of all victims tracked by Brandefense.

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.

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Confirmed Victims
9
Rank By Victims
#224
Last Leak-Site Post
Jul 11, 2025
Top Country
Unknown
Top Sector
Unknown

Victims Posted Per Month.

Rook confirmed victims per month
MonthConfirmed victims
July 20259
August 20250
September 20250
October 20250
November 20250
December 20250
January 20260
February 20260
March 20260
April 20260
May 20260
June 20260
July 20260
August 20260
September 20260
October 2026 (month in progress)0
Updated continuously · figures as of Oct 19, 2026

Latest Rook Victims.

Search all 9 →
Latest confirmed leak-site victims claimed by Rook
VictimCountryIndustryData claimedPosted
Abdi ibrahimUnknownUnknownNot stated
Rosendahl Design GroupUnknownUnknownNot stated
Rossell TechsysUnknownUnknownNot stated
EvalueserveUnknownUnknownNot stated
DENSOUnknownUnknownNot stated
Data breach summaryUnknownUnknownNot stated

How They Operate.

Rook's threat actor profile lists 1 malware and tools, with its targets and related actors.

TTPs, CVEs and malware →

History.


  1. First seen in Brandefense data

  2. Busiest month on record: 9 confirmed victims

  3. First confirmed victim listed on its leak site

  4. Most recent leak-site post

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Figures as of Oct 19, 2026. Confirmed leak-site claims collected by Brandefense technologies and validated by Brandefense analysts.

Listed on a leak site means a ransomware group has claimed the company; it is not a confirmed breach. To request a correction or removal, contact Brandefense.