Attackers have launched massive attacks in Europe from a network of at least 10,000 hacked websites, several security companies have warned.
Analysts reported the opening salvos of a large-scale attack based on the multi-exploit hacker kit called "Mpack” as early as Friday. Attackers taint compromised websites with code that redirects visitors to a server hosting the Mpack kit - a professional, Russian-made collection of exploits that comes complete with a management console to detail which exploits are working, and against what countries' domains.
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More info:
TrendMicro - Italian Job
Mpack it up
Symantecc - Mpack packed full of badness
Slashdot - The Italian Job
Update:
An Italian blog reports that all of the servers compromised are IIS 6.0/Windows 2003 servers.