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In this 63 infected hosts botnet, the botnet master is playing around with it by launching another MSN malware spreading campaign, and injecting the malware process within legitimate applications.
These three botnets (5,225, 3,771 and 929 infected hosts) are a good example of how the botnet master diversifying the infection vectors by launching multiple campaigns, thereby building multiple botnets. What he's forgetting is the fact that not only is he using IRC as command and control, but all the botnets are on the same server.
Yet another targeted botnet campaign in progress that has already managed to infect 621 hosts.