"While traditional ClickFix campaigns direct victims to the Windows Run dialog, TerminalFix campaigns apply the same technique but direct users to Windows Terminal or PowerShell instead, increasing the likelihood that complex, multi-line scripts execute successfully," Microsoft security researchers Sagar Patil, Suriyaraj Natarajan, and Parasharan Raghavan said in an analysis published this week.

The campaign, targeting organizations across multiple sectors, leverages compromised websites as a starting point to serve fake Cloudflare CAPTCHA verifications that prompt unsuspecting site visitors to copy and execute a malicious PowerShell command.

The attack chain, per the Windows maker, is a sophisticated multi-stage process that leverages DLL sideloading, steganographic payload extraction, extensive Active Directory reconnaissance, and a bespoke custom reverse-tunnel implant that grants the attacker persistent, network-level proxy access through the infected machine. More here