Amv International Development Listed by thegentlemen Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

People connected to Amv International Development — employees, partners, or others whose details sit in company systems — now face the practical question of whether internal files taken in a ransomware attack could expose them to fraud, unwanted contact, or further targeting. Public reporting so far leaves the scale and exact contents unclear, yet the listing itself is enough to warrant careful attention.

On 9 September 2025 the ransomware group known as thegentlemen claimed to have listed Amv International Development after an attack that involved the exfiltration of internal files. The number of people affected remains unknown, and independent confirmation of the claim has not been published.

Inside the incident

According to the available record, Amv International Development was listed by thegentlemen ransomware group on 9 September 2025. The group asserts that internal files were exfiltrated during a ransomware attack. No further technical details — such as the initial access method, the precise date of intrusion, the volume of data taken, or any ransom demand — have been disclosed in the public summary. The number of individuals whose information may be involved is listed as unknown. The listing itself constitutes a claim by the group rather than a verified confirmation by the company or independent investigators.

Who is thegentlemen?

thegentlemen is a ransomware operation that has appeared in public reporting in recent years. Like many contemporary groups, it is known for double-extortion tactics: encrypting systems while also stealing data and threatening to publish it on a dedicated leak site if payment is not made. The group typically posts victim names and sample claims on its site to increase pressure. Prior activity attributed to thegentlemen has involved organisations across multiple sectors and countries, though each listing must be treated as an unverified assertion until corroborated. In this case the group claims Amv International Development as a victim; no additional statements by the group about this specific organisation beyond the listing itself are recorded in the facts.

Who is Amv International Development?

Amv International Development SA operates in the civil-engineering construction industry. Public business directories place its headquarters in Bucaramanga, Santander, Colombia, and estimate its workforce at between 250 and 499 people with annual revenue in the range of 10 million to 25 million. The company maintains a website at www.amvsa.com. Organisations of this type routinely handle project plans, contracts, supplier and client records, employee information, financial documents, and operational data necessary for large construction and engineering work. A breach of such an entity can therefore affect not only staff but also business partners, subcontractors, and clients whose details are stored in internal systems. Because the company sits in a sector that often deals with infrastructure and public or private development projects, the potential reach of any compromised material extends beyond a single office.

The information in question

The public record states only that internal files were exfiltrated in a ransomware attack. No specific categories — such as personal identifiers, financial records, or project documents — have been named. Organisations in civil engineering and construction typically hold employee personnel files, payroll data, client and supplier contact lists, contracts, technical drawings, and internal correspondence. Whether any of those categories were among the files taken remains unconfirmed. The exact contents of the claimed exfiltration are therefore undisclosed, and no verified inventory has been released.

What's at stake

For individuals whose data may have been among the internal files, the practical risks include identity misuse, targeted phishing that references real company details, and possible financial fraud if banking or identification information was present. Even limited internal documents can give criminals enough context to craft convincing social-engineering attempts. For Amv International Development itself the consequences can include operational disruption, regulatory scrutiny under applicable data-protection rules, contractual liabilities to clients and partners, and reputational damage that may affect future bids or partnerships. Because the number of people affected is unknown and the precise data types remain unconfirmed, the full extent of these risks cannot yet be quantified. The listing by a ransomware group does, however, place the organisation and anyone connected to it under heightened scrutiny until more information emerges.

What to do if you're exposed

If you have a past or present connection to Amv International Development — as an employee, contractor, client, or supplier — treat the claim seriously while recognising that details remain limited. Practical first steps include:

• Monitor bank and credit accounts for unexpected activity and consider placing fraud alerts with credit bureaus where available.
• Be cautious of emails, calls, or messages that reference the company or its projects; verify any request through known official channels before responding.
• Change passwords on work-related and personal accounts that may have been reused, and enable multi-factor authentication wherever possible.
• Review any documents or credentials you previously shared with the organisation and note whether they contained sensitive personal information.
• Keep records of any suspicious contact that appears to exploit knowledge of the company.

Readers can also run a free exposure scan of their email address to check whether that address has already appeared in known breach data sets. Such a check does not confirm involvement in this specific incident, but it can indicate whether further protective measures are warranted. Stay alert for any official statements from Amv International Development or relevant authorities as more verified information becomes available.

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