Kasseika ransomware group
Kasseika is one of the extortion operations we watch continuously. This page covers what is known about the group and the current state of its leak site.
Who they are
Kasseika is a ransomware variant first publicly reported in January 2024, identified as a new evolution of the BlackMatter/LockBit ransomware codebase. The malware appends the .kasseika extension to encrypted files and uses a double-extortion model, combining file encryption with threats to publish stolen data on a Tor-based leak site. Early analysis revealed that Kasseika shares several traits with LockBit 3.0, including encryption routines, obfuscation methods, and ransom note structure, but with modified branding and negotiation portals. Initial access vectors have not been widely confirmed, though patterns from related ransomware suggest the use of compromised credentials, RDP exploitation, and vulnerabilities in public-facing services. Victims have been observed in North America, Europe, and Asia, spanning industries like manufacturing, logistics, and professional services.
Current status
Kasseika's leak site is not answering. Sites go dark for infrastructure trouble, a deliberate quiet period, or a takedown, and a good number return weeks later under the same name, so the entry stays on the list either way.
Which organisations this group has named, and when, is part of the SINON platform rather than this page. Create an account to search it, or to be told automatically if a name you care about turns up.
Sectors targeted
This group does not state an industry on its site, so we have nothing reliable to report. Most crews are opportunistic rather than sector-specific in any case — they hit what they can reach.
Watching for your name
If Kasseika posts your company, a supplier or a subsidiary, you want to hear it from us rather than from a journalist. SINON checks these sites continuously and alerts on the names you give it.
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