Researchers Detail PureCrypter Loader Cyber Criminals Using to Distribute Malware

Cybersecurity researchers have detailed the workings of a fully-featured malware loader dubbed PureCrypter that’s being purchased by cyber criminals to deliver remote access trojans (RATs) and information stealers.

“The loader is a .NET executable obfuscated with SmartAssembly and makes use of compression, encryption, and obfuscation to evade antivirus software products,” Zscaler’s Romain Dumont said in a new report.


Some of the malware families distributed using PureCrypter include Agent TeslaArkeiAsyncRATAZORultDarkCrystal RAT (DCRat), LokiBotNanoCoreRedLine StealerRemcosSnake Keylogger, and Warzone RAT.

PureCrypter Malware Loader

Sold for a price of $59 by its developer named “PureCoder” for a one-month plan (and $249 for a one-off lifetime purchase) since at least March 2021, PureCrypter is advertised as the “only crypter in the market that uses offline and online delivery technique.”

Crypters act as the first layer of defense against reverse engineering and are typically used to pack the malicious payload. PureCrypter also features what it says is an advanced mechanism to inject the embedded malware into native processes and a variety of configurable options to achieve persistence on startup and turn on additional options to fly under the radar.

Also offered is a Microsoft Office macro builder and a downloader, 

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