Junior Hacker Used Tailscale and OpenSSH to Keep Access After His C2 Went Offline
A French-speaking attacker broke into a small French automotive business, planted a keylogger, and stole banking and email credentials. Ordinary stuff, until one move near the end. Before his command-and-control server went dark, he installed OpenSSH and Tailscale on a victim's machine, building a way back in that did not run through the C2 at all. When the Havoc server went offline the next day, his access did not. Eighteen days later, the C2 came back, his agents reconnected on their own, and he carried on. Cato NetworksĀ captured the whole operation command by command, 339 of them over 33 days, after the operator left his SSH keys and a step-by-step playbook in an open storage bucket. The write-up, published Tuesday by Cato CTRL researcher Vitaly Simonovich, is a rare view of an intrusion from the operator's keyboard rather than the forensic leftovers. Researchers' lesson is blunt: pulling a C2 server offline is not remediation if the attacker has already built a...
ī Jun 17, 2026