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

Ruins.GF 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.

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

It uses stealth techniques to avoid being detected by the user:

• It deletes the original file from which it was run once it is installed on the computer.

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

• Its code is encrypted and it is only decrypted when it is going to run. Because of this, its code is not legible through a memory dump.

Ruins.GF 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.