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Inside FortiBleed: Reverse Engineering the CyberStrike Harvester Behind a Global FortiGate Credential Factory

released on 2026-06-24 @ 03:38:21 AM
FortiBleed is a large-scale credential compromise campaign targeting internet-facing Fortinet FortiGate firewalls and SSL VPN gateways globally. The operation employs a sophisticated credential pipeline utilizing credential stuffing, password spraying, configuration harvesting, offline cracking, and post-authentication capture processing. Reverse engineering of the CyberStrike Harvester v1.5 binary revealed a comprehensive workflow converting FortiGate access into multi-protocol credential extraction, hash cracking via Hashcat/Hashtopolis GPU clusters, VPN-bound Active Directory and SMB access, and file-share exfiltration. The campaign affected devices across 194 countries and uses a seven-VM Kali lab infrastructure with automated tooling including FortiGate Sniffer panels, Telegram-orchestrated cracking bots, and Python/Impacket-based lateral movement tools. One documented exfiltration operation collected 121.43 GB from internal file shares. The operation appears to function as initial-access brokerage wi...