Insomnia
Since Feb 7, 2026, Insomnia has listed 54 organizations on its leak site.
Listings per month
- Total listings
- 54
- First listing
- Feb 7, 2026
- Latest listing
- Oct 5, 2026
- MITRE ATT&CK techniques
- 0
Insomnia is a data-theft and extortion group that emerged in October 2025, targeting primarily US-based healthcare organizations — stealing patient files and threatening public exposure rather than encrypting files — and avoiding former Soviet states, consistent with Russian-speaking cybercrime norms.
It posted 54 listings in the last 12 months; the busiest month was February 2026 (25 listings).
Most targeted country: United States, with 51 listings (94% of the total).
Most targeted sector: Healthcare, with 22 listings (41% of the total).
Targeted countries
Showing 10 of 54 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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