tsmx.net.br Listed by funksec Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

On January 28, 2025, the Brazilian domain tsmx.net.br appeared on the leak site operated by the funksec ransomware group. The group claims to have exfiltrated internal files in a ransomware attack. The number of people affected remains unknown, and public detail on the precise scope of the incident is limited.

This listing places the organisation among those targeted by double-extortion ransomware operators, who typically steal data before encrypting systems and threaten to publish the material if demands are not met. For anyone whose information may have been held by tsmx.net.br, the claim raises concrete questions about what was taken and how it might be misused.

What happened

According to the available record, tsmx.net.br was listed on the funksec ransomware leak site on or around January 28, 2025. The group claims to have stolen internal data through a ransomware attack that involved exfiltration of internal files. No further technical details—such as the initial access method, the duration of the intrusion, the volume of data taken, or any ransom demand—have been disclosed in the public summary. The number of individuals potentially affected is listed as unknown. At this stage the listing itself constitutes an unverified claim by the threat actor rather than an independently confirmed breach report from the organisation.

Who is funksec?

Funksec is a ransomware group that has operated publicly since late 2024. Like many contemporary ransomware crews, it follows a double-extortion model: operators claim to encrypt systems while simultaneously stealing data, then post victim names on a dedicated leak site to pressure payment. Public reporting on the group notes that it has listed organisations across multiple sectors and geographies, often with relatively short turnaround times between claimed intrusion and public naming. Funksec has also been associated in open-source coverage with the use of readily available or AI-assisted tooling for some of its operations, though such characterisations remain general observations about the actor rather than specifics tied to any single victim. In the present case, the only assertion that can be attributed to funksec is its claim that it stole internal data from tsmx.net.br; no additional statements by the group about this particular organisation have been recorded in the facts.

Who is tsmx.net.br?

tsmx.net.br is a Brazilian internet domain. Public detail about the precise nature of the organisation behind the site is limited; the .net.br country-code top-level domain indicates a Brazilian entity, but the available breach record does not describe its business activities, size, or customer base. Organisations operating under Brazilian commercial domains commonly handle a mix of operational records, customer or user information, internal correspondence, and administrative files. A ransomware incident affecting such an entity is consequential because any internal files taken could contain personal data of employees, clients, or partners, as well as proprietary business material. Without confirmation from the organisation itself, the exact role of tsmx.net.br and the sensitivity of its holdings remain unconfirmed beyond the general profile of similar Brazilian web-based operations.

What was likely exposed

The facts state that internal files were exfiltrated in a ransomware attack, according to the group’s claim. No inventory of specific data types—such as names, contact details, financial records, credentials, or documents—has been published. Organisations of this kind typically store employee records, customer or user databases, contracts, email archives, and system configuration files. Because the exact contents remain unconfirmed, it is not possible to state with certainty what personal or commercial information left the environment. The sole concrete description available is the claim of “internal files.”

Why it matters

For individuals whose data may have been held by tsmx.net.br, the primary risk is secondary misuse of any personal information that was present among the internal files. Even limited records can enable phishing, identity fraud, or targeted social engineering. For the organisation, the incident—if the claim is accurate—creates operational disruption, potential regulatory exposure under Brazilian data-protection rules, and reputational pressure arising from the public listing. Because the number of people affected is unknown and the data types are described only at a high level, the full scale of impact cannot yet be measured. The listing itself, however, already places the organisation under public scrutiny and may prompt further examination by customers, partners, and regulators.

Were you affected?

If you have ever interacted with tsmx.net.br—whether as a customer, employee, partner, or user—consider the following practical steps:

• Monitor financial and email accounts for unexpected activity or phishing attempts that reference the organisation.
• Change passwords associated with any accounts that may have been linked to the site, and enable multi-factor authentication where available.
• Review statements and credit reports for signs of unauthorised use of personal details.
• Treat unsolicited communications that claim to relate to this incident with caution; verify through official channels before responding.

Readers can also run a free exposure scan of their email address to check whether their information has already surfaced in known breach data sets. Public detail on this particular incident remains limited, so continued monitoring of official statements from the organisation is advisable.

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