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

Downloader.NHT 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 changes the security settings of Internet Explorer, decreasing its security level.

It uses several methods in order to avoid detection by antivirus companies:

• It terminates its own execution if it detects that it is being executed in a virtual machine environment, such as VMWare or VirtualPC.

Downloader.NHT 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.