Kraken
Since Feb 9, 2025, Kraken has listed 25 organizations on its leak site.
Listings per month
- Total listings
- 25
- First listing
- Feb 9, 2025
- Latest listing
- Nov 13, 2025
- MITRE ATT&CK techniques
- 0
Kraken is a Russian-speaking ransomware group that emerged in February 2025, believed to have links to the HelloKitty operation, employing a RaaS model notable for a benchmarking step that measures victim machine speed to optimize encryption, and in September 2025 launched an underground criminal forum called "The Last Haven Board."
It posted no listings in the last 12 months.
Most targeted country: United States, with 8 listings (32% of the total).
Most targeted sector: Technology, with 9 listings (36% of the total).
Targeted countries
Showing 10 of 25 results
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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