Yimp.b

Yimp.b is an Internet worm, which spreads through instant messages sent using the AIM or Yahoo! Messenger application. The victim receives a message containing a link to a malicious file. Once he or she clicks on a link and executes a file, the worm immediately installs itself to the computer and runs a spreading routine. Yimp.b sends bogus instant messages to all the user's contacts. Then it runs a payload. It drops and installs an adware spyware and unsolicited software. Yimp.b automatically runs on every Windows startup.