Key Takeaways
Just months after being disrupted during Operation Cronos, the notorious LockBit ransomware group has reemerged — and it hasn’t wasted time. Check Point Research has confirmed that LockBit is back in operation and already extorting new victims.
Throughout September 2025, Check Point Research identified a dozen organizations targeted by the revived operation, with half of them infected by the newly released LockBit 5.0 variant and the rest by LockBit Black. The attacks span Western Europe, the Americas, and Asia, affecting both Windows and Linux systems, a clear sign that LockBit’s infrastructure and affiliate network are once again active.
A Rapid and Confident Comeback
At the beginning of September, LockBit officially announced its return on underground forums, unveiling LockBit 5.0 and calling for new affiliates to join. This latest version, internally codenamed “ChuongDong,” marks a significant evolution of the group’s encryptor family.
The newly observed LockBit 5.0 attacks span a broad range of targets — about 80% on Windows systems, and around 20% on ESXi and Linux environments. The quick reappearance of multiple active victims demonstrates that LockBit’s Ransomware-as-a-Service (RaaS) model has successfully reactivated its affiliate base.
From Disruption to Reorganization
Until its takedown in early 2024, LockBit was the most dominant RaaS operation globally, responsible for 20–30% of all data-leak site victim postings. Following Operation Cronos, several arrests and data seizures disrupted the group’s infrastructure. Competing ransomware programs, such as RansomHub and Qilin, briefly tried to absorb its affiliates.
However, LockBit’s administrator, LockBitSupp, evaded capture and continued to hint at a comeback on dark web forums. In May 2025, he posted defiantly on the RAMP forum: “We always rise up after being hacked.” By August, LockBitSupp reappeared again, claiming the group was “getting back to work,” a statement that quickly proved true.
A Divided Underground
While LockBit regained traction on RAMP, other major forums like XSS continued to ban RaaS advertising. In early September, LockBitSupp attempted to be reinstated on XSS, even prompting a community vote, which ultimately failed.
Implications: A Familiar Threat Returns
LockBit’s reemergence underscores the group’s resilience and sophistication. Despite high-profile law enforcement actions and public setbacks, the group has once again managed to restore its operations, recruit affiliates, and resume extortion.
With its mature RaaS model, cross-platform reach, and proven reputation among cyber criminals, LockBit’s return represents a renewed threat to organizations across all sectors. September’s wave of infections likely marks only the beginning of a larger campaign — and October’s postings may confirm the group’s full operational recovery.
orums as part of our Threat Discovery Process.
Designed to target Windows systems, this ransomware employs advanced encryption techniques and appends a unique file extension to compromised files. Its stealthy evasion tactics and persistence mechanisms make detection and removal challenging. This highlights the need for proactive cybersecurity measures and a robust incident response strategy to safeguard data integrity and minimize breach risks.
Target Technologies: Windows
Target Geography: France, USA.
Target Industry: Government, Manufacturing, Pharma.
Encrypted file extension: .vanhelsing
Observed First: 2025-03-16
Threat actor Communication mode: Tor
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The LockBit ransomware group will soon launch a comeback with the planned release of LockBit 4.0 in February 2025, Cyble
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