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The Prilex PoS malware evolved out of a simple memory scraper into very advanced and complex malware, dealing directly with the PIN pad hardware protocol instead of using higher level APIs, doing real-time patching in target software, hooking operating system libraries, messing with replies, communications and ports, and switching from a replay-based attack to generate cryptograms for its GHOST transactions even from credit cards protected with CHIP and PIN technology.

Since then, we have been tracking the threat actor’s every move, witnessing the damages and great financial losses they brought upon the payments industry.

They quickly adopted the malware-as-a-service model and expanded their reach abroad, creating a toolset that included backdoors, uploaders and stealers in a modular fashion. These are criminals with extensive knowledge of the payment market, and EFT software and protocols. But the criminals’ greed had no limits: they wanted more, and so they achieved it.Īctive since 2014, in 2016, the group decided to give up ATM malware and focus all of their attacks on PoS systems, targeting the core of the payment industry. The group was behind one of the largest attacks on ATMs in the country, infecting and jackpotting more than 1,000 machines, while also cloning in excess of 28,000 credit cards that were used in these ATMs before the big heist.

Prilex is a Brazilian threat actor that has evolved out of ATM-focused malware into modular point-of-sale malware.

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