FIN6 Hacker Group Inject Skimmers into Thousand of E-commerce Sites to Steal Credit Card Data

FIN6 hacking group active since 2015, PoS systems are their primary targets. The hacking group is financially motivated and employs several attack vectors to steal payment card data.

Researchers observed a new FIN6 hacking group campaign attacking the E-commerce websites hosted on cloud platforms through service provider “Volusion.”

Credit Card Skimmers – FIN6 Hacking Group

The credit card skimming attack also known as Magecart or E-Skimming, attackers use to inject malicious javascript in checkout pages of the E-commerce websites.

Once the customer submits their personal and financial data, the malicious script exfiltrates the data associated to the attacker’s server.

“Based on the Trend Micro report, more than 3,126 online shops were affected by the current wave of the attack. The attackers seemed more experienced they did not simply add their malicious code at the top or end of a script; instead, they carefully integrated the code into the original script to be part of the execution flow of the program.”

They kept the code as simple as possible to stay hidden under big libraries. The code was injected into Volusion’s e-commerce platform client websites.

The malicious scripts were injected into a navigation menu, checkout page and the codes were integrated with jQueryUI to stick with the original process flow.

Attackers loaded the malicious scripts from Google storage services, once the customer enters the personal, Financial details and submitted the form, then the skimmer gets executed.

The skimmer copies all the data such as the victim’s name, address, phone number, email address, and credit card details (the number, cardholder name, expiration month, expiration year, and CVV number). All the data are exfiltrated and sent to the attacker’s server.

“The attackers used the domain “volusion-cdn[.]com” for their exfiltration server, a similar name to Volusion’s legitimate server.” Based on the modus operandi researchers believe the attackers are from Magecart Group 6, also known as the threat actor FIN6.

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