Instant Messenger Trojan (generic description).
An Instant Messenger Trojan is usually a standalone program that affects a certain Instant Messenger (IM) client. There are a few widely used instant messenger networks - ICQ, MSN, Yahoo!, AOL and a few others. All these networks have specific clients that are available to all subscribers. Some instant messenger clients, for example Trillian, can connect to multiple IM networks.
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Instant Messenger trojans are usually standalone programs that are sent by hackers to their potential victims in emails or instant messages. IM trojans are most frequently used to steal user's IM account information. When such trojan is run, it tries to locate an IM client's user information and to send it to a hacker via email or using the existing IM client. That way a hacker gets all data he needs to connect to an IM network using victim's credentials.
Most famous IM trojans: Ypager, Ikmet, Spy, ICQSteal.