Reuters reported that Microsoft Corp and the FBI, aided by authorities in more than 80 countries, launched a major assault on one of the world’s biggest cyber crime rings, believed to have stolen more than $500 million from bank accounts over the past 18 months.

Microsoft said its Digital Crimes Unit on Wednesday successfully took down at least 1,000 of an estimated 1,400 malicious computer networks known as the Citadel Botnets.

Citadel infected as many as 5 million PCs around the world and, according to Microsoft, was used to steal from dozens of financial institutions, including: American Express, Bank of America, Citigroup, Credit Suisse, eBay’s PayPal, HSBC, JPMorgan Chase, Royal Bank of Canada and Wells Fargo.

Scary when you think how much and probably how easy digital crime is to undertake.