1. Skip to navigation
  2. Skip to content
  3. Skip to secondary-content

Where You Are

  1. Labs
  2. Threats
  3. Virus and threat descriptions
  4. Trojan:W32/DNSChanger

Trojan:W32/DNSChanger

Name : Trojan:W32/DNSChanger
Category:Malware
Type:Trojan
Platform:W32

Summary

Trojan:W32/DNSChanger will change the infected system's Domain Name Server (DNS) settings in order to divert traffic to unsolicited, and potentially illegal sites.

Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.

Additional Details

The trojan is usually a small file (about 1.5 kilobytes) that is designed to change the 'NameServer' Registry key value to a custom IP address. This IP address is usually encrypted in the body of a trojan.

As a result of this change, a victim's computer will contact the newly assigned DNS server to resolve names of different webservers.


Variant: Trojan.Win32.DNSChanger.al

Lately we got a few samples of this trojan that were named 'PayPal-2.5.200-MSWin32-x86-2005.exe'. This trojan was programmed to change the DNS server name of a victim's computer to 193.227.227.218 address.

The Registry key that is affected by this trojan is:

  •  [HKLM\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Interfaces]
      "NameServer"

Other registry modifications made involve creating these keys:

  •  HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{random}
    DhcpNameServer = 85.255.xx.xxx,85.255.xxx.xxx
  • HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{random}
    NameServer = 85.255.xxx.133,85.255.xxx.xxx
  • HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\
    DhcpNameServer = 85.255.xxx.xxx,85.255.xxx.xxx
  • HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\
    NameServer = 85.255.xxx.xxx,85.255.xxx.xxx