The Russians have attacked again. No, they are not coming ashore, they are infiltrating credit card databases. Los Angeles-based Creditcards.com is the latest victim. According to published reports, more than 55,000 valid credit card account numbers were stolen from the Internet company’s database three months ago. The hackers, believed to be from Russia, then tried to extort money from Creditcards.com, threatening to post the credit card accounts numbers on the Internet unless a fee was paid. Since Creditcards.com refused to give in to the extortion attempt, the accounts numbers were posted briefly online. The FBI is on the case. This is the fourth major attack on credit card databases maintained by Internet companies in less than a year. Other major attacks included CD Universe, Western Union, SalesGate, and RealNames.