downloader.JQD is a Trojan, which although seemingly inoffensive, can actually carry out attacks and intrusions.
It reduces the security level of the computer:
it changes the security settings of Internet Explorer, decreasing its security level.
downloader.JQD accesses several websites to download files, which it then runs. These can be any type of file, although they are normally malware.
downloader.JQD does not spread automatically using its own means. It needs an attacking user's intervention in order to reach the affected computer. The means of transmission used include, among others, floppy disks, CD-ROMs, email messages with attached files, Internet downloads, FTP, IRC channels, peer-to-peer (P2P) file sharing networks, etc.