Kairos · Threat actors

Kairos is a data extortion group active since late 2024 that focuses solely on data theft with no encryption, primarily targeting small-to-mid-sized organizations in healthcare, manufacturing, and business services in the US, purchasing initial access from brokers and demanding Bitcoin payments.

It posted 49 listings in the last 12 months; the busiest month was December 2025 (10 listings).

Most targeted country: United States, with 60 listings (57% of the total).

Most targeted sector: Professional Services, with 19 listings (18% of the total).

Targeted countries

Targeted sectors

VictimLe Centre National de l'Expertise Hospitalière (CNEH)CountryFranceSectorHealthcareListedSep 30, 2026

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Published reports on this actor:

https://www.cyjax.com/resources/blog/an-elephant-in-kairos-data-leak-site-emerges-for-new-extortion-group/

Source: MISP Galaxy, Malpedia.

What does a ransomware group do?

Ransomware groups break into corporate networks, move data out and encrypt systems. If the ransom is not paid, they list the organization on a leak site and threaten to publish the data.

What should you do if your organization is listed on a leak site?

Record the listing and any published sample files; do not visit the leak site from the corporate network.
Isolate affected systems and preserve logs without deleting them.
Determine which data left the organization; if personal data is involved, review notification obligations with your legal team.
Make any decision about the ransom demand together with legal, management and incident response.
Do not bring systems back online before the attacker’s entry point is closed.

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