Bert
Since Apr 6, 2025, Bert has listed 7 organizations on its leak site.
Listings per month
- Total listings
- 7
- First listing
- Apr 6, 2025
- Latest listing
- Jun 10, 2025
- MITRE ATT&CK techniques
- 0
BERT is a newly emerged ransomware group first identified in mid-2025, targeting Windows and Linux platforms across healthcare, technology, and event services sectors in Asia, Europe, and the US, with ransomware derived from a Linux variant of REvil using AES encryption and multi-threaded file locking.
It posted no listings in the last 12 months.
Most targeted country: United States, with 2 listings (29% of the total).
Most targeted sector: Technology, with 3 listings (43% of the total).
Targeted countries
Showing 7 of 7 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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