BEDFORD, Mass.-The security firm RSA is warning that international cyber-crooks are working together and planning a major malware attack to steal money from online accounts of consumers at 30 or more major U.S. banks as part of a large-scale orchestrated crimewave campaign.

Several major banks were targeted last week in attacks, although it's unknown if those attacks are related to the RSA forecast.

"The blitzkrieg-like series of Trojan attacks is set to be carried out by approximately 100 botmasters. RSA believes this is the making of the most substantial organized banking-Trojan operation seen to date," said Mor Ahuvia, cybercrime communications specialist for RSA in a statement on its website.

RSA also cautioned that cyber-criminals are noted for changing tactics or not following through with specific plans, but it added there was an unusual amount of chatter online about the effort.

RSA is recommending institutions review authentification procedures for online wire transfers and telephone transfers.

Specifically, RSA said its research and analysis suggest the cyber-thieves will unleash a little known "Gozi Prinimalka" Trojan program that will infiltrate computers belonging to thousands of U.S. banking customers and use the hijacked machines to initiate fraudulent wire transfers from their accounts.

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