J
RansomwareAbout the group
J is an emerging ransomware group that launched its leak site in May 2025, claiming over 41 victims by late 2025 including FAI Aviation Group (Germany), operating primarily as a leak-site-centric extortion identity with limited public technical analysis.
Exploited vulnerabilities
No CVEs attributed to this group in public sources (MITRE ATT&CK). Absence of attribution does not mean absence of activity.
Impact and victims
The group J has 2 known ransomware victims. See the most affected sectors and countries and recent victims.
2known victims
2in Brazil
2sectors hit
Most attacked sectors
Education1
Technology1
Most affected countries
🇧🇷 Brasil2
Recent victims
brdigital.net.br
uva.edu.br
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