Fog ransomware group
Fog 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, which we last saw change 1y ago.
Who they are
Fog is a sophisticated ransomware strain first observed in April–May 2024, initially targeting U.S. educational institutions before expanding into sectors such as government, business services, finance, and manufacturing. The group conducts fast, double-extortion attacks: they exploit compromised VPN credentials or known vulnerabilities, deploy encryption (notably using extensions like .fog, .FLOCKED), and exfiltrate data prior to encryption to maximize victim pressure. Fog is associated with other prolific actors—such as Akira and Conti—through shared tooling, infrastructure timelines, and even cryptocurrency wallets.
Current status
Fog'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.
The last change we recorded on it was 1y ago (5 Jun 2025 15:11 UTC).
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 Fog 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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