DNSChanger.AFB is a Trojan, which although seemingly inoffensive, can actually carry out attacks and intrusions.
DNSChanger.AFB prevents access from programs to websites of several companies related with security tools (antivirus programs, firewalls, etc.).
DNSChanger.AFB 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.
It uses stealth techniques to avoid being detected by the user:
- It uses techniques included in its code to hide itself while it is active.
- It terminates processes corresponding to several security tools, such as antivirus programs and firewalls, to prevent detection.
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.
DNSChanger.AFB 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.