high severity February 19, 2024 · 3 min read Unverified claim — what this is

ki.se Listed by Trisec Ransomware Group

If you are a customer of ki.se, here’s what is being claimed, and what it would mean for you.

ki.se was listed on the trisec ransomware leak site. The group claims to have stolen internal data.
— from Trisec’s own leak-site posting. This is the group’s claim, quoted verbatim; it is not GalaxyWarden’s reporting and has not been independently verified.

On February 19, 2024, the Swedish medical university Karolinska Institutet (ki.se) appeared on the leak site operated by the trisec ransomware group. The listing states that the attackers exfiltrated internal files during a ransomware incident and are now publishing samples as part of their extortion campaign. Anyone whose personal, medical, or employment records are held by the institution may be affected even though the exact number of impacted individuals has not been disclosed.

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Reported Details from the Listing

The trisec leak site entry for ki.se claims the group successfully stole internal data and is prepared to release it unless their demands are met. The disclosure does not quantify the volume of records taken, list specific data types beyond “internal files,” or provide a firm publication deadline. Public mirrors of the leak site, including ransomware.live, state the listing went live on 19 February 2024. No separate breach notification from Karolinska Institutet had surfaced at the time the listing appeared.

Why This Matters for You and Your Family

Karolinska Institutet is one of Europe’s largest medical research universities and runs major hospitals in the Stockholm region. Its systems therefore hold highly sensitive information: patient medical histories, research participant data, employee payroll and HR files, and student records. When such material is stolen, the exposure extends far beyond the institution itself. If you, your partner, or your children have ever received treatment, participated in a clinical trial, worked, or studied there, your private details could now sit in an attacker’s archive. The trisec listing makes clear that the data has already left Karolinska’s control.

Doxxing and Identity-Chain Risks

Ransomware operators rarely stop at posting generic “internal files.” Once initial samples appear, subsequent leaks often include spreadsheets that link names, dates of birth, national identification numbers, email addresses, and phone numbers. These records become the foundation for doxxing chains: an attacker who obtains your medical file can cross-reference it with gaming usernames, social-media handles, or family addresses found in other breaches. The result is a single, persistent profile that can be used for identity theft, targeted phishing, or extortion against you or your relatives. Credential leaks of this nature also cascade into account takeovers on gaming platforms, where children’s accounts are frequently secured with the same email or password reused at work or school.

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What the free scan actually returns

Sample resultyou@email.comIllustrative — not a real person

Found on people-search siteswe remove these

These listings are live, public, and legal to remove — and removing them is what we do.

value redacted in this sampleage, relatives, address historySpokeo

value redacted in this samplephone, household, property recordsBeenVerified

value redacted in this sample580 companies checked

Found in breach recordsverifiedreported — unverified

Each record is labeled: confirmed breach data, or an attacker’s claim no one has verified.

verifiedvalue redacted in this samplepassword + phone · 2024telecom breach

unverifiedvalue redacted in this sampleclaimed in ransomware listing · 2026leak-site claim

Leaked data cannot be deleted from the internet — anyone claiming otherwise is lying. Broker listings can be removed. We do the second, and show you exactly what to fix from the first.

Report details & sourcing

Attributed to Trisec · 3 incidents tracked →

Severity High the filing does not enumerate what was exposed

Disclosed February 19, 2024

Last reviewed August 8, 2026

Affected Unconfirmed

By GalaxyWarden Threat Research · Editorial & sourcing standards

Unverified claim — what this report is

This page documents a public listing on a ransomware/extortion group’s leak site, tracked via public threat-intelligence sources. A listing is the attacker’s claim. GalaxyWarden aggregates and reports such claims; we have not independently verified that a breach occurred, what data (if any) was taken, or the accuracy of anything the group asserts, and the named organisation has not necessarily confirmed the incident. Sections above describe what the listing shows and the group’s documented history — not verified findings about the named organisation. If you represent this organisation and believe anything here is inaccurate, tell us and we’ll review it promptly.

Editorial & sourcing policy

GalaxyWarden is a breach-monitoring service and news aggregator. We do not exfiltrate, host, purchase, or redistribute stolen data. Breach information is compiled from publicly accessible sources and threat-intelligence platforms, and is reported as claims attributed to their source. We promptly correct or remove material shown to be inaccurate — see our content & takedown policy or write to support@galaxywarden.com.

Threat-actor tracker

Trisec — 3 incidents tracked

Every breach we've attributed to Trisec, in one running log. See who else they've hit →

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