Bidon ransomware group
Bidon 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
BIDON is a variant of the Monti ransomware family, first observed around mid‑2023. It employs a double‑extortion strategy—encrypting victims’ files and simultaneously threatening to leak stolen data if the ransom isn’t paid. Notably, it appends the .PUUUK extension to encrypted files and drops a readme.txt ransom note outlining the extortion demands. The note offers a free decryption of two files as proof of capability and emphasizes that only authorized company personnel (e.g., top management) should engage. BIDON specifically targets corporate and enterprise organizations, not home users, and warns victims not to involve law enforcement or third-party recovery firms. It represents a shift toward more aggressive extortion tactics within the Monti lineage.
Current status
Bidon'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 Bidon 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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