Dialer.ATR 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.ATR 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.
Dialer.ATR prevents access from programs to websites of several companies related with security tools (antivirus programs, firewalls, etc.).
Dialer.ATR redirects attempts to access web pages of certain banks to spoofed pages, with the aim of logging information entered by the user in these pages.
Dialer.ATR redirects attempts to access several web pages to a specific IP address.
Dialer.ATR 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.