This malicious parasite is a script trojan , which usually infects the system via various Internet resources (such as peer-to-peer networks) or e-mail messages from unknown senders. Once that had happened, this pest tries to infect MS Outlook and send several e-mail letters to the specified address with the help of this program . Although this technique doesn't carry any special danger, it's still recommended to get rid of this trojan as soon as possible.
VBS.Challenge