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.
Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.
More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.
You may also refer to the Knowledge Base on the F-Secure Community site for more information.
Instant Messenger trojans are usually standalone programs that are sent by hackers to their potential victims in e-mails 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 e-mail 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.