Attackers Using Obfuscation Tools to Deliver Multi-Stage Malware via Invoice Phishing
Apr 09, 2024
Malware / Cryptojacking
Cybersecurity researchers have discovered an intricate multi-stage attack that leverages invoice-themed phishing decoys to deliver a wide range of malware such as Venom RAT , Remcos RAT, XWorm, NanoCore RAT, and a stealer that targets crypto wallets. The email messages come with Scalable Vector Graphics (SVG) file attachments that, when clicked, activate the infection sequence, Fortinet FortiGuard Labs said in a technical report. The modus operandi is notable for the use of the BatCloak malware obfuscation engine and ScrubCrypt to deliver the malware in the form of obfuscated batch scripts. BatCloak , offered for sale to other threat actors since late 2022, has its foundations in another tool called Jlaive. Its primary function is to load a next-stage payload in a manner that circumvents traditional detection mechanisms. ScrubCrypt, a crypter that was first documented by Fortinet in March 2023 in connection with a cryptojacking campaign orchestra...