Skip to main content
Darkfield

Ransomware victim disclosure

← All victims

CPI Books

Claimed by Medusa · listed 1 year ago

2.500 employees
Records
16m
Age
since listed · data leaked

Status timeline

  1. ListedMar 9, 2025
  2. Data leakeddate unknown

At a glance

Group
Medusa
Status
Data leaked
Country
United Kingdom
Sector
Manufacturing
Listed on leak site
Mar 9, 2025
Records
2.500 employees

About the victim

AI dossier — public-source company profile

CPI Books is the UK's leading book printing service provider, producing books and journals across multiple channels including trade publishing, STM (scientific/technical/medical), tax, law, bibles, catalogues, and self-publishing. The company operates from its corporate office in Beccles, Norfolk.

Industry
Book Printing & Publishing Services
Address
Copland Way, Beccles, Norfolk, NR34 7TL, United Kingdom
Employees
2500

Attack summary

Severity: high — Confirmed exfiltration of significant data volume (183+ GB) from a major UK publishing/printing firm with 2,500 employees. Likely includes customer, financial, and operational data across multiple publishing sectors.

Medusa group claims to have exfiltrated 183.20 GB of data from CPI Books. The specific nature of the data and whether encryption was also deployed is not detailed in the post.

high

Data the group says was taken

AI dossier — extracted from the leak post
  • Business records
  • Publishing contracts
  • Customer data
  • Financial records

What the group claims

CPI Books is the UK’s book printing service provider. CPI produces books and journals across multiple channels including; Trade, STMA, Tax, Law, Bibles, Catalogues, as well as Self-Publishing. Cpi Uk corporate office is located in Copland Way, Beccles, Norfolk, NR34 7TL, United Kingdom and has 2,500 employees. The total amount of data leakage is 183.20

Sources

Source

Indexed 1 year ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

Is this your supplier? Your competitor? You?

Pro plans monitor your domain, corporate emails, and crypto wallets across every new ransomware leak-site post, breach dump and Telegram callout — alerts within 5 minutes.

Disclosure context

About Medusa

Medusa, also known as MedusaLocker, is a financially motivated ransomware group that emerged in November 2022 and has since compromised 568 known victims across multiple countries. The group's origin and specific affiliations remain unclear from publicly available intelligence, though their operational patterns suggest they function as an independent ransomware operation rather than a documented Ransomware-as-a-Service model. Medusa primarily targets organizations in the United States, United Kingdom, Canada, Italy, and Australia, with a focus on business services, healthcare, manufacturing, and technology sectors, employing typical ransomware tactics including data encryption and likely exfiltration for double extortion purposes, though specific technical methodologies and initial access vectors have not been extensively documented in public threat intelligence reports. While the group has maintained a relatively high victim count since its emergence, detailed information about specific notable campaigns, high-profile victims, or major ransom demands has not been widely reported by major cybersecurity firms or law enforcement agencies. As of current intelligence assessments, Medusa appears to remain active in the threat landscape, continuing to target organizations across their established geographic and sectoral preferences. The group has been linked to 635 public disclosures across our corpus. First observed on a leak site on November 15, 2022; most recent post May 5, 2026. The operation is currently active.

Also tracked as: MedusaLocker, MEDUSA LOCKER.

Timeline of this disclosure

  • March 9, 2025CPI Books listed by Medusaon the group's public leak site
Records
2.500 employees

Other recent disclosures by Medusa

Medusa has been linked to 635 public victims on Darkfield. A sample of the most recent:

See the full Medusa dossier →

Sector and geography

This disclosure adds to ransomware activity in the Manufacturing sector, which has 3,681 disclosures indexed across all operators we track. Geographically, CPI Books is reported in United Kingdom, a country with 1,217 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Medusa means CPI Books 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, NCSC (United Kingdom), as required for your jurisdiction.
  • Monitor for the data appearing on Medusa'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.