Threats Tagged 'session token theft'

Huntress researchers discovered Knight Office, a phishing kit utilizing Adversary-in-the-Middle techniques to steal Microsoft 365 session tokens. The attack chain begins with DocuSign-themed phishing emails containing redirects through Monday.com and compromised Joomla websites. Victims are directed to credential capture pages where session tokens are harvested and fed into the Knight Office console. These stolen tokens enable attackers to bypass multi-factor authentication entirely by using already-authenticated sessions. In one incident, attackers registered rogue devices in Microsoft Entra ID and bound Windows Hello for Business credentials for persistence. Analysis revealed nine phishing attacks linked to this kit over two weeks, with hundreds of related emails reported since April. The console, hosted at IP 104.37.188.94, manages at least 25 phishing domains using .vu top-level domains.

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.

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