Windows 2003/XP/2000/NT

Dialer.JVK is a dialer type malware. Dialers usually try to establish phone connections with high rate numbers, significantly increasing the phone bill of the affected user.

Dialer.JVK affects computers that use a modem to connect to the Internet, as the virus modifies the Dial-up network access settings. It changes the telephone number provided by the ISP (Internet Service Provider), which is a local-rate number, to a high-rate number.

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

• It modifies system permissions in order to hide itself.

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

• It prevents scanning tools from running, such as Windows Registry Editor, FileMonitor, etc.
• It terminates its own execution if it detects that a memory dump program is running, such as Procdump.
• It terminates its own execution if it detects that a debugging program is active.

Dialer.JVK 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.