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A series of new versions of the Bagle virus hit PCs last week, several of which attempted to install Trojans on infected machines.
The viruses were seeded through a massive spamming effort that experts say was facilitated by the many PCs infected by previous variants of Bagle and are being used as spam proxies.
The Trojans installed by the new variants try to halt anti-virus and other security software and connect to remote Web servers to look for other malicious code to download.
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