The size and volume of spam botnets are down over the last
year, and much of this can be attributed to the effectiveness of IP-based blacklists. However,
this defense method is no panacea as scammers have found new methods like reputation
hijacking to circumvent these roadblocks, and bots continue to extend their
reach by piggybacking on existing worms and viruses.

A federal magistrate judge has recommended that Microsoft be given
ownership of 276 internet addresses used to control “Waledac,” a massive
botnet that the software company has been working to bring down. Read the full article. [The Register]

Since April, a son-of-Kraken botnet has infected an estimated 318,058
machines – about half as big as the original Kraken was at its height
in the middle of 2008, according to Paul Royal, a research scientist at
the Georgia Tech Information Security Center. Read the full article. [The Register]

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