Abyss
Since Mar 21, 2023, Abyss has listed 91 organizations on its leak site.
Listings per month
- Total listings
- 91
- First listing
- Mar 21, 2023
- Latest listing
- Aug 26, 2026
- MITRE ATT&CK techniques
- 0
Abyss (also known as Abyss Locker) is a ransomware operation first identified in March 2023, derived from the Babuk source code, that targets Windows and Linux/VMware ESXi systems using double-extortion tactics across healthcare, manufacturing, finance, and technology sectors — predominantly in North America.
It posted 7 listings in the last 12 months; the busiest month was June 2026 (2 listings).
Most targeted country: United States, with 43 listings (47% of the total).
Most targeted sector: Professional Services, with 22 listings (24% of the total).
Targeted countries
Showing 10 of 91 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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