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A recently discovered malware builder called Quantum Builder is being used to deliver the Agent Tesla remote access trojan (RAT).

“This campaign features enhancements and a shift toward LNK (Windows shortcut) files when compared to similar attacks in the past,” Zscaler ThreatLabz researchers Niraj Shivtarkar and Avinash Kumar said in a Tuesday write-up.

Sold on the dark web for €189 a month, Quantum Builder is a customizable tool for generating malicious shortcut files as well as HTA, ISO, and PowerShell payloads to deliver next-stage malware on the targeted machines, in this case Agent Tesla.

The multi-stage attack chain starts with a spear-phishing email containing a GZIP archive attachment that includes a shortcut designed to execute PowerShell code responsible for launching a remote HTML application (HTA) using MSHTA.

images from Hacker News