Computers in more than 50 countries are infected with a new version of Pushdo, a spamming botnet that has been around since 2007 and survived several attempts to shut it down.
Researchers are hoping to get a better insight on botnets after taking down part of Pushdo, one of the top five networks of hacked computers responsible for most of the world's spam.
A botnet responsible for a significant amount of spam has been crippled but may reconstitute itself in a matter of weeks, according to vendor M86 Security.
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