In brief: Modern attack techniques enable compromise from phishing email to system takeover in approximately five minutes, with multi-factor authentication bypassed through session hijacking.
Barracuda Networks has demonstrated in an attack simulation how adversaries require only five minutes from a phishing email to complete system compromise. The attack combines AI-generated emails, authentication bypasses, and downstream code injection.
The simulation by Barracuda security researchers demonstrates the typical flow of a modern attack chain. A victim receives a phishing email created with generative AI, opens it, and enters their credentials on a spoofed Microsoft login interface. Although multi-factor authentication is enabled, the attackers simultaneously intercept session information and authentication cookies—effectively bypassing MFA protection.
After account takeover, attackers gain access to the victim’s email, SharePoint, and OneDrive. They establish inbox rules to obscure their activities and approve OAuth applications that ensure persistent access—independent of whether the original session is terminated later. In parallel, ClickFix fraud is deployed: the victim is prompted to execute an alleged verification code, through which a malicious script is silently activated on the endpoint.
After five minutes, the attackers have already established permanent access and can subsequently escalate privileges, exfiltrate data, or deploy additional malware. Jesus Cordero-Guzman, Director Solution Architects AppSec, NetSec & XDR EMEA in the Office of the CTO at Barracuda, explicitly warns against relying solely on multi-factor authentication—modern attacks deliberately target browser sessions and tokens.
The required defense is based on multiple layers: phishing-resistant authentication mechanisms such as security keys, modern email protection systems with real-time analysis, email authentication standards such as DMARC, and continuous employee awareness training. Security teams must monitor unusual login patterns, new inbox rules, scheduled tasks, and suspicious device access. Rapid isolation of compromised accounts is critical to limiting propagation speed.
Source: www.it-daily.net · Published 30 June 2026
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