Nathan And Nathan Listed by killsec Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

Ransomware groups continue to dominate the modern threat landscape, routinely combining encryption with data theft and public leak-site pressure to coerce payments from organisations of every size. Against that backdrop, the appearance of Nathan And Nathan on a killsec leak site on 9 September 2025 is a reminder that even lesser-known entities can become targets. Public reporting states only that the group claims to have exfiltrated internal files; the number of people affected remains unknown and further technical detail has not been released. For anyone whose personal or professional information may have been held by the organisation, the listing itself is enough to warrant attention.

Because the claim originates solely from the threat actor’s site and has not been independently confirmed in the available record, the precise scope and success of the intrusion stay unconfirmed. What is clear is that such listings form part of a well-established double-extortion pattern that has become routine in 2024–2025.

Inside the incident

According to the sole public report, Nathan And Nathan was listed on the killsec ransomware leak site on 9 September 2025. The group asserts that it stole internal files during a ransomware attack. No further timeline has been disclosed: the date of initial access, the duration of any dwell time, the encryption status of systems, or whether a ransom demand was issued all remain unreported. The number of people whose data may have been involved is listed as unknown. No sample files, volume figures, or screenshots beyond the listing itself have been made public in the available record. In short, the incident is known only through the actor’s claim of exfiltration of internal files; everything else is undisclosed.

Who is killsec?

Killsec is a ransomware operation that has been active in the public eye for several years, typically employing a double-extortion model. After gaining access—often through phishing, exposed remote services or unpatched vulnerabilities—the group encrypts systems and simultaneously exfiltrates data, then threatens to publish the stolen material on its leak site if payment is not received. Like many contemporary ransomware crews, killsec maintains a dark-web portal where it posts victim names, sometimes accompanied by file trees or sample documents, to increase pressure. Prior public activity has included listings of small-to-medium enterprises across multiple sectors, though the group does not always follow through with full data dumps. In this case the listing of Nathan And Nathan constitutes a claim by the group; it should not be treated as independently verified fact until additional evidence appears.

About Nathan And Nathan

Public detail on Nathan And Nathan itself is limited. The organisation appears in open sources simply as a named entity that maintains internal business files. Organisations of this general type commonly hold employee records, client correspondence, financial documents, contracts and operational data. A breach involving such material can therefore affect both the organisation’s own staff and any external parties whose information is stored in those systems. Because the exact nature of Nathan And Nathan’s work and client base has not been elaborated in the breach reporting, the full range of potential exposure cannot be mapped from the public record alone. What is certain is that any compromise of internal files carries operational and reputational consequences for the entity and privacy consequences for the individuals whose data those files contain.

What data was at risk

The only data type named in the available facts is “internal files exfiltrated in ransomware attack.” No inventory of specific document categories, no count of records, and no confirmation of whether personal identifiers, financial details or credentials were included have been released. Organisations that maintain internal files typically store a mixture of employee personal data, client or partner information, proprietary business documents and system credentials. In the absence of a confirmed data inventory, it is not possible to state which of these categories—if any—were actually taken. Readers should therefore treat the precise contents as unconfirmed while recognising that the actor’s claim of internal-file theft is the sole public assertion on record.

The real-world impact

For individuals whose information may have been among the internal files, the practical risks include targeted phishing, identity-related fraud and unwanted contact if contact details or other personal data were present. Because the volume and exact nature of the data remain unknown, the scale of that risk cannot be quantified. For Nathan And Nathan the consequences are operational and reputational: restoration of systems, potential regulatory notification duties, and the need to communicate with staff or clients whose data may have been involved. Even when a ransom is not paid and full publication does not occur, the mere listing can erode trust and divert resources toward incident response and monitoring. In the broader landscape, each such claim reinforces the economic incentive that keeps ransomware groups active.

What to do if you're exposed

If you have any past or present relationship with Nathan And Nathan—employee, contractor, client or supplier—treat the claim seriously until more information emerges. Begin by changing passwords for any accounts that may have shared credentials with the organisation, enabling multi-factor authentication wherever possible, and monitoring financial and credit statements for unusual activity. Be alert to phishing messages that reference the organisation or claim to offer breach-related assistance. Preserve any official communications you receive from Nathan And Nathan itself. Finally, you can run a free exposure scan of your email address to check whether your information has already appeared in known breach data sets; doing so provides an immediate, concrete step toward understanding your personal exposure footprint.

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