Ransomware Group
J
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.
Known victims41
Threat level
MEDIUM
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Known infrastructure
The following Tor hidden services have been associated with this group:
Posts | J BlogJ
These sites are malicious. Open them only from an isolated environment.
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