Advance Tapes International Listed by medusa Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

Ransomware groups continue to target manufacturers and mid-sized industrial firms, often listing them on leak sites after claiming to have stolen data and encrypted systems. These incidents form part of a broader pattern in which attackers seek leverage by threatening public disclosure of internal material, regardless of whether the victim is a household name.

On 21 March 2025, Advance Tapes International, a UK manufacturer of specialist pressure-sensitive adhesive tapes, was listed by the Medusa ransomware group. The group claims to have exfiltrated 128.70 GB of internal files. The number of people affected remains unknown, and public detail beyond the listing and claimed volume is limited. The incident matters because any organisation holding operational, commercial or personnel records can expose individuals and partners to follow-on risks once data leaves its control.

Breaking down the breach

Public reporting states that Advance Tapes International was listed by the Medusa ransomware group on 21 March 2025. According to the listing, the attackers exfiltrated internal files in a ransomware attack and claim the total volume of data taken is 128.70 GB. No further technical detail about the intrusion method, the date of initial access, or the precise timeline of encryption has been disclosed in the available record. The number of individuals whose information may be involved is listed as unknown. The organisation’s corporate office is given as Westmoreland Avenue, Thurmaston, LE4 8PH, England. Beyond the claimed data volume and the characterisation of the material as internal files, no additional confirmed indicators have been released.

Inside medusa

Medusa is a ransomware operation that has been active for several years and is known for double-extortion tactics: encrypting systems while also stealing data and threatening to publish it on a dedicated leak site if a ransom is not paid. The group typically posts victim names, claimed data volumes and sample files to pressure organisations into negotiation. Its listings are claims made by the attackers themselves and are not independently verified unless confirmed by the victim or by subsequent investigation. Medusa has previously targeted a range of sectors, including manufacturing, professional services and public-sector entities, often focusing on organisations large enough to hold valuable operational data yet not always equipped with the most extensive defensive resources. In this case the group claims to have taken 128.70 GB of material from Advance Tapes International; that figure and the assertion of successful exfiltration remain the group’s statements rather than independently corroborated facts.

About Advance Tapes International

Advance Tapes International is a UK-based manufacturer founded in 1964. It produces specialist pressure-sensitive adhesive tapes used across industrial, technical and commercial applications. Companies of this type typically maintain records relating to production processes, supply-chain partners, customer contracts, employee information and internal operational documentation. A breach involving such an organisation is consequential because manufacturing firms often sit at the intersection of proprietary technical data, commercial relationships and personal information of staff and contacts. Disruption or exposure can affect day-to-day operations, contractual obligations and the privacy of individuals whose details appear in internal systems.

The information in question

The available facts describe the exposed material only as “internal files exfiltrated in a ransomware attack,” with a claimed volume of 128.70 GB. No specific categories—such as customer lists, employee records, financial documents or technical drawings—have been publicly named. Organisations in the specialist manufacturing sector commonly hold personnel files, supplier and customer contact details, order histories, quality and compliance records, and proprietary process information. Whether any of those categories were among the files claimed by Medusa has not been confirmed. The exact contents therefore remain unconfirmed, and any assessment of what was taken rests solely on the group’s listing.

The real-world impact

For individuals whose data may have been present, the primary risks are secondary misuse of personal or contact information, potential phishing that leverages knowledge of the company, and the possibility that sensitive commercial details could be used against partners or employees. Because the number of people affected is unknown and the precise data types are undisclosed, the scale of personal exposure cannot be quantified from public sources. For the organisation itself, the incident carries operational, reputational and potential regulatory consequences: recovery from ransomware can interrupt production, contractual relationships may be strained by uncertainty over data security, and any personal data involved could trigger notification duties under applicable privacy law. These outcomes depend on what was actually taken and how the company responds—details that remain limited in the public record.

If your data was in this claimed breach

If you have a past or present connection to Advance Tapes International—as an employee, contractor, supplier or customer—treat the possibility of exposure seriously even though the exact contents are unconfirmed. Monitor financial and email accounts for unusual activity, be cautious of unsolicited messages that reference the company or claim to have inside knowledge, and consider changing passwords used for any related services. You can also run a free exposure scan of your email address to check whether your information has already appeared in known breach data sets. Keep records of any suspicious contact and report confirmed identity or financial misuse to the relevant authorities and institutions.

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