Adler Shine LLP Listed by medusa Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

Adler Shine LLP, a UK-based professional services firm, has been listed by the Medusa ransomware group as a victim of a data breach involving the claimed exfiltration of internal files. The listing was reported on 7 February 2025. Public detail remains limited: the number of people affected is unknown, and the precise method and timing of the intrusion have not been independently confirmed beyond the group's assertions.

What is known so far centres on the claim that 332.20 GB of data was taken in a ransomware attack. For clients, partners and anyone whose information may sit inside the firm's systems, the incident raises ordinary but serious questions about what was exposed and what practical steps follow.

Inside the incident

According to the Medusa listing reported on 7 February 2025, Adler Shine LLP suffered a ransomware attack in which internal files were exfiltrated. The group states that the total volume of data taken amounts to 332.20 GB. No independent confirmation of the attack's start date, duration, initial access vector or encryption status has been made public. The number of individuals whose personal or commercial data may be involved is listed as unknown.

The available record does not describe whether systems were encrypted, whether a ransom demand was issued, or whether any negotiation took place. It also does not disclose whether the firm has verified the authenticity or completeness of the claimed data set. Until further official statements appear, the core facts remain those asserted on the leak site: a listing of the firm, the claim of internal-file exfiltration, and the stated volume of 332.20 GB.

The group behind it: medusa

Medusa is a ransomware operation that has been active for several years and is known for a double-extortion model. In typical campaigns the group encrypts systems and simultaneously steals data, then threatens to publish the material on a dedicated leak site if payment is not made. Public reporting has documented Medusa's use of phishing, exploitation of remote-access tools and other common initial-access techniques, followed by lateral movement and large-scale data theft before encryption.

The group maintains a public leak site where it posts victim names, sample files and, in some cases, full archives. Listings are claims made by the operators; they are not independent verification that every named organisation was successfully breached or that every claimed file set is authentic. In this instance Medusa claims Adler Shine LLP as a victim and asserts that 332.20 GB of internal files were taken. No further specific statements by the group about this particular firm—such as sample file names or a publication deadline—are recorded in the available facts.

About Adler Shine LLP

Adler Shine LLP is a limited-liability partnership founded in 1986 and registered in the United Kingdom under LLP number OC301724. Its corporate office is listed at Aston House, Cornwall Avenue, London N3 1LF. The firm provides processing of AIM and ISDX market transactions, business-process outsourcing, tax-management services, and the organisation of mass events involving well-known personalities.

Firms of this type routinely handle sensitive commercial records, client financial data, tax filings, transaction histories and personal details of individuals involved in corporate or event-related work. A breach at such an organisation is consequential because the data it holds can include both personal identifiers and commercially confidential material, creating potential exposure for clients, counterparties and staff even when the exact contents of any stolen archive remain unconfirmed.

The information in question

The facts name the exposed material only as “internal files exfiltrated in a ransomware attack,” with a claimed volume of 332.20 GB. No further breakdown—such as specific categories of personal data, client lists, tax returns or event-related records—has been disclosed in the public record.

Organisations offering market-transaction processing, tax management and business-process services typically hold names, addresses, financial account details, tax identifiers, corporate documents and correspondence. Whether any of those categories appear in the claimed 332.20 GB archive is unconfirmed. Readers should treat the precise contents as unknown until verified by the firm or by independent analysis of any published material.

What's at stake

For individuals whose data may have been held by Adler Shine LLP, the practical risks include possible misuse of personal or financial details for fraud, targeted phishing, or identity-related crime. Because the firm processes market transactions and tax matters, any compromised records could also affect commercial counterparties through the exposure of deal information or tax filings.

For the organisation itself, the stakes include regulatory notification duties under UK data-protection law, potential contractual liabilities to clients, reputational damage, and the operational cost of investigation and remediation. The unknown number of affected people and the unconfirmed nature of the file set mean that both the firm and any potentially impacted parties must proceed on the basis of incomplete information while monitoring for further developments.

If your data was in this claimed breach

If you have a past or present relationship with Adler Shine LLP—whether as a client, employee, event participant or business partner—consider the following practical steps:

• Monitor bank and credit accounts for unexpected activity and enable transaction alerts where available.
• Treat unsolicited emails, calls or messages that reference the firm or tax/market matters with caution; verify any request through known official channels.
• Change passwords for accounts that may have shared credentials or recovery details linked to the firm, and enable multi-factor authentication.
• Request a copy of your personal data or a breach notification from the firm if you believe you may be affected, and keep records of any correspondence.
• Run a free exposure scan of your email address to check whether it has already appeared in known breach data sets elsewhere.

Public detail on this incident is still limited. Continue to watch for official statements from Adler Shine LLP and for any independent verification of the claimed data set. Acting promptly on the steps above reduces the window of opportunity for misuse even while the full picture remains incomplete.

AICompiled with AI assistance from public sources and published under our editorial standards.