Trojan:W32/DNSChanger.ARNF, Trojan:W32/DNSChanger.ARNF, Worm.Win32.AutoRun.udt, TR/Crypt.XPACK.Gen (Avira), Trojan:​Win32/Alureon.gen!J (Microsoft)


A trojan, or trojan horse, is a seemingly legitimate program which secretly performs other, usually malicious, functions. The program is often started by the user, and it does not usually replicate.


Automatic action

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

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Technical Details

This malicious software is dropped onto the system by Trojan-Dropper:W32/Agent.FLN. It is used to change the DNS settings on a system so that information such as passwords and credit card details can be retrieved.


During installation, this malware creates the following files:

  • c:\autorun.inf - contains the autostart routine for c:\resycled\
  • c:\resycled\ - detected as Trojan:W32/DNSChanger.ARNF

It also creates this directory:

  • c:\resycled


Once installed, this malware attempts to connect to a website via HTTP POST:


It is capable of changing the DNS settings in the machine to:


Registry Modifications

Sets these values:

  • HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Windows\ControlActiveService = Spooler
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\msqpdxvxmsqpdxrun = dword:00000047msqpdxpff =msqpdxaff =msqpdxinfo =msqpdxid = "rfx ||fcegeea "msqpdxsrv = dword:6802f719
  • HKEY_CLASSES_ROOT\msqpdxvxmsqpdxrun = dword:00000047msqpdxpff =msqpdxaff =msqpdxinfo =msqpdxid = "rfx ||fcegeea "msqpdxsrv = dword:6802f719

Creates these keys:

  • HKEY_LOCAL_MACHINE\Software\Classes\msqpdxvx
  • HKEY_CLASSES_ROOT\msqpdxvx

Date Created: -

Date Last Modified: -