Windows 2003/XP/2000/NT/ME/98/95

Downloader.IQN is a Trojan, which although seemingly inoffensive, can actually carry out attacks and intrusions.

• In the local network: it generates a large amount of network activity and consumes bandwidth.

It reduces the security level of the computer: it opens one or more ports to allow remote access to the computer and takes action that compromises user confidentiality.

Downloader.IQN accesses several websites to download files, which it then runs. These can be any type of file, although they are normally malware.

Downloader.IQN uses the following propagation or distribution methods:

• Exploiting vulnerabilities with the intervention of the user: exploiting vulnerabilities in file formats or applications. To exploit them successfully it needs the intervention of the user: opening files, viewing malicious web pages, reading emails, etc.
• Via Internet, exploiting remote vulnerabilities: attacking random IP addresses, in which it tries to insert a copy of itself by exploiting one or more vulnerabilities.

Downloader.IQN is easy to recognize, as it shows the following symptoms:

• It displays false error messages when it is run.