网络蠕虫.Win32.Koobface.a在用户访问他/她的MySpace账户时开始传播。这种蠕虫会对朋友的账户发表一系列评论。网络蠕虫.Win32.Koobface.b的目标是Facebook的用户,它能创建垃圾邮件并通过Facebook网站发送给被感染用户的朋友。这种邮件及评论包括如:Paris Hilton Tosses Dwarf On The Street; Examiners Caught Downloading Grades From The Internet; Hello; You must see it!!! LOL. My friend catched you on hidden cam; Is it really celebrity? Funny Moments,以及许多其它类似评论。