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Ransomware · Threat Group Dossier Active · currently disclosing victims

Medusa

Medusa is a ransomware operation with 518 publicly named victims. Public victim-naming auctions, ESXi-capable encryptor, PsExec/Mimikatz.

518
Named victims
6
In 2026
50
Countries hit
14 Feb 2026
Last disclosure

fingerprintDossier

Active since
June 2021
Origin / attribution
Unclear, Russian-speaking affiliates
Known aliases
MedusaLocker (unrelated), Medusa Blog
Common initial access
Initial-access brokers, Fortinet and Citrix n-days, phishing
TTPs & tradecraft
Public victim-naming auctions, ESXi-capable encryptor, PsExec/Mimikatz.
Notes
CISA AA25-071A published in 2025 with detection hunts.

publicTop countries hit

United States256
United Kingdom37
Canada36
Italy14
Australia13
Brazil11
France9
India8

factoryTop sectors targeted

Business Services62
Not Found59
Healthcare43
Manufacturing35
Technology32
Government17
Agriculture and Food Production16
Education16

historyRecent named victims

Balloons Everywhere
US · Consumer Services · 14 Feb 2026
South Hays Fire Department
US · Public Sector · 14 Feb 2026
Comune di Battipaglia
IT · Public Sector · 14 Feb 2026
Grandview Family Medicine
US · Healthcare · 14 Feb 2026
MESA Products
US · Manufacturing · 14 Feb 2026
Resource Corporation of America
US · Not Found · 04 Jan 2026
JBS
US · Healthcare · 28 Dec 2025
Thunder Bay Counselling
CA · Public Sector · 19 Dec 2025
Sampoerna Agro
ID · Agriculture and Food Production · 19 Dec 2025
Shamrock Technologies
US · Technology · 19 Dec 2025
Callipo Group
IT · Agriculture and Food Production · 19 Dec 2025
Universidade Municipal de São Caetano
BR · Education · 30 Nov 2025
WR Comercial
BR · Not Found · 30 Nov 2025
Concord Academy
US · Education · 30 Nov 2025
General Distributing
Transportation/Logistics · 21 Nov 2025

Sourced from open leak-site monitoring · Generated 20 Apr 2026