Antivirus vendor Sophos is warning of a new variant of the Dumaru worm. Like previous variants, Dumaru.E disguises itself as a security patch from Microsoft. The Swen worm, which likewise masquerades as a patch from Microsoft, also continues circulating (though numbers appear to be dropping). Unlike the Dumaru worms that have one composed message, Swen often sends itself as a fake "bounced" message as well.