Researchers at Proofpoint have uncovered a sophisticated tool commonly used by malicious actors to build weaponized documents for phishing campaigns.

Dubbed LCG Kit, the service has helped small crime groups create docs capable of spreading a variety of remote access trojans and information stealers, such as Loki Bot, FormBook, Agent Tesla, Remcos, AZORult, REvcode RAT and Quasar RAT.

Discovered in March of this year, LCG Kit is unique, Proofpoint explains in a Dec. 13 blog post, because its code "is highly obfuscated using polymorphic shellcode and a Linear Congruential Generator (LCG) – an algorithm to generate a sequence of pseudorandom numbers – to encrypt the final stage of the code, including the payload locations."

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