A group of cybercriminals have combined two powerful malware programs to create a new online banking Trojan that has already stolen millions of dollars from customers of 24 U.S. and Canadian banks.

The new threat has been dubbed GozNym by researchers from IBM X-Force because it combines the stealthy Nymaim malware and the Gozi banking Trojan.

The new computer Trojan targets 22 websites that belong to banks, credit unions and e-commerce platforms based in the U.S., and two that belong to financial institutions from Canada. Business banking services appear to be a top target for GozNym’s creators, according to the IBM researchers.

Nymaim is what researchers call a dropper. Its purpose is to download and run other malware programs on infected computers. It is usually distributed through Web-based exploits launched from compromised websites.

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