Threats Tagged 't1133'

An exposed attacker server has unveiled FortiBleed, a large-scale credential-compromise campaign targeting internet-facing Fortinet FortiGate firewalls and SSL VPN gateways globally. This operation involved credential harvesting through reuse, brute force, and hash cracking using a distributed GPU infrastructure with approximately 36 rented GPUs via Hashtopolis. The exposed directory contained 319 files revealing scanning tools, cracking infrastructure, credential databases, post-exploitation toolkits, and active VPN configurations. While initially reported as affecting 21,632 domains, analysis of the attacker's own tooling reveals only 918 organizations showed evidence of internal network compromise, with merely 148 confirmed cases where credentials were fully cracked. The operation ultimately aimed to sell initial access to compromised networks, with victims spanning 194 countries, predominantly India, United States, and Taiwan.

MediumCampaignUnited StatesBritish Indian Ocean TerritoryColombia+3#vpn compromise#hash cracking#fortibleed

An FBI investigation identified Denis Nikolayevich Obrezko, a Russian national, as facilitating cyber intrusions conducted by the Russia-aligned threat group Void Blizzard. Between June and July 2024, multiple U.S. companies across various sectors were targeted in a large-scale cyber espionage campaign involving mass email harvesting and unauthorized access. The threat actors utilized stolen session tokens, proxy services, and VPNs to authenticate to victim Office 365 environments and exfiltrate data. Obrezko allegedly obtained critical infrastructure including a virtual private server and domain registration used in these attacks. FBI investigation linked Obrezko through cryptocurrency transactions, email accounts, phone numbers, and IP addresses to domains and infrastructure used in the intrusion campaign. Eleven U.S. companies have confirmed unauthorized access, representing only a fraction of suspected victims nationwide.

MediumCampaignUnited States#void blizzard#cryptocurrency#denis obrezko

On May 15, 2026, Huntress agents detected an intrusion where threat actors compromised a terminal server to stage a massive phishing campaign rather than deploy ransomware. The attacker used legitimate bulk email software (Gammadyne Mailer) with a project file named 'dracii' (Romanian for 'the devils') and six recipient lists containing 8,894,920 email addresses. Operating from Romanian IP addresses, the actor impersonated UK pharmacy chain Boots through a fake customer satisfaction survey designed to harvest personal and payment card data. The phishing kit was hosted on a compromised Bolivian government website (ipelc.gob.bo), which Huntress reported to Bolivia's national CSIRT. The campaign used direct-to-MX delivery to bypass mail relays, with the mailer configured to send from 666 threads simultaneously. Evidence suggests this Romanian operator has been running multiple UK-targeting campaigns since at least July 2025, rotating between retail, tax, and cryptocurrency themes.

Chinese threat actor VerdantBamboo compromised a victim organization and its Managed Services Provider over an 18-month period, deploying malware on network edge devices lacking EDR coverage. The initial breach involved an Egnyte Storage Sync system, where attackers exploited a sudo misconfiguration for privilege escalation and installed BRICKSTORM backdoor and AGENTPSD fallback implant. Investigation revealed the MSP's pfSense firewall was also compromised with a FreeBSD variant of BRICKSTORM. After remediation, VerdantBamboo regained access through stolen firewall credentials, enabling custom VPN access and deploying PLENET backdoor on a Synology NAS. The threat actor leveraged compromised systems as proxies to access Microsoft 365 environments while evading security controls. VerdantBamboo demonstrated operational discipline by targeting appliances without EDR capabilities and using sophisticated malware including PLENET, compiled with .NET Native AOT to hinder analysis.