notariusze.waw.pl Listed by killsec Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

Ransomware groups continue to target professional service providers that hold concentrated stores of personal and legal records, turning routine office systems into leverage for extortion. In this landscape, listings on criminal leak sites have become a common way for attackers to pressure victims and advertise their claims. On 4 August 2024, the ransomware group killsec publicly listed notariusze.waw.pl, asserting it had breached the organisation and exfiltrated internal files.

Public detail remains limited. The number of people affected is unknown, and independent confirmation of the intrusion has not been published. What is known comes from the group’s own claim: that it took internal files and demanded 10 000 EUR to “wipe the databreach.” For clients and counterparties of a Warsaw notarial practice, even an unverified claim of this kind raises concrete questions about the security of documents that often contain identity, property and financial information.

Inside the incident

According to the listing attributed to killsec, the group breached notariusze.waw.pl and exfiltrated internal files in a ransomware attack. The reported summary states: “We have breached notariusze.waw.pl. For us to wipe the databreach, we ask for a ransom of 10000 EUR.” The listing was reported on 4 August 2024. No further technical detail—such as the initial access method, the duration of access, the volume of data taken, or whether encryption was also deployed—has been disclosed in the available record. The number of individuals whose information may have been involved is listed as unknown. Because the only public source is the threat actor’s own claim, the incident should be treated as an unverified assertion until corroborated by the organisation or independent investigators.

Who is killsec?

Killsec is a ransomware operation that has appeared on public leak sites in recent years. Like many such groups, it typically claims to have stolen data and then threatens to publish or sell it unless a ransom is paid. The group’s public postings often include short statements of the demand and, in some cases, samples or file lists intended to prove access. Its tactics align with the broader double-extortion model: data theft is used as leverage even if systems are not fully encrypted. Prior activity attributed to killsec has involved a range of organisations, though specifics of those campaigns are outside the scope of this record. In the present case, the group’s listing of notariusze.waw.pl and the stated 10 000 EUR demand constitute its claim; they do not, by themselves, establish that the breach occurred or that the ransom was paid or refused.

About notariusze.waw.pl

Notariusze.waw.pl is associated with notarial services in Warsaw, Poland. Notaries in Poland are public officers who authenticate legal acts, including property transfers, wills, powers of attorney, company formations and other instruments that carry legal force. Their offices routinely handle identity documents, personal data of clients and witnesses, financial details, property records and correspondence with courts and registries. Because these materials are often unique or difficult to re-create, a compromise of a notarial practice can affect not only the firm’s own operations but also the legal certainty of transactions that depend on the integrity of its records. A claim that internal files from such an office have been taken therefore carries weight beyond a typical commercial data incident.

What data was at risk

The available facts state only that “internal files” were exfiltrated in a ransomware attack. No inventory of file types, no count of records, and no confirmation of specific personal-data categories have been published. Organisations of this kind typically hold client identification documents, drafts and final versions of notarial acts, contact details, banking or payment references linked to transactions, and internal administrative records. Whether any of those categories were among the files claimed by killsec remains unconfirmed. Readers should treat the precise contents of the alleged exfiltration as undisclosed.

Why it matters

If the claim is accurate, individuals whose documents passed through the practice could face risks of identity misuse, targeted fraud, or unauthorised disclosure of private legal and financial affairs. Property and inheritance matters, in particular, can be sensitive; knowledge of pending transactions or family arrangements can be exploited. For the organisation itself, an unresolved claim of data theft can undermine client confidence, trigger regulatory scrutiny under data-protection rules, and create lasting operational costs even if systems are restored. Because the scale of any exposure is unknown, the practical impact on any single person cannot be quantified from public information alone. The incident nevertheless illustrates how professional custodians of legal records remain attractive targets for groups seeking leverage through sensitive data.

What to do if you're exposed

Anyone who has used notarial services connected with notariusze.waw.pl should monitor bank and credit accounts for unusual activity, be alert to phishing or social-engineering attempts that reference legal or property matters, and consider placing fraud alerts with relevant credit or identity-protection services where available. If you hold original documents or copies of acts prepared by the practice, retain them securely and note any unexpected requests for re-authentication. Free exposure-scan tools that check whether an email address appears in known breach datasets can provide an additional, limited check; they do not prove or disprove involvement in this specific incident, but they can surface other exposures that warrant attention. Official confirmation or guidance from the organisation, if issued, should take precedence over third-party claims.

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