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Published Aug 27, 2009 | Updated Sep 15, 2017


Detected by Microsoft Defender Antivirus

Aliases: Trojan.Win32.Agent.cubq (Kaspersky) W32/DNSChanger.EOHQ (Norman) (McAfee) Trj/Alureon.BD (Panda) Backdoor.Tidserv (Symantec)


Trojan:Win32/Alureon.gen!U is a generic detection for a component of Win32/Alureon - a family of data-stealing trojans. These trojans allow an attacker to intercept incoming and outgoing Internet traffic in order to gather confidential information such as user names, passwords, and credit card data. The Win32/Alureon trojan may also allow an attacker to transmit malicious data to the infected computer. The trojan may modify DNS settings on the host computer to enable the attacker to perform these tasks. Therefore it may be necessary to reconfigure DNS settings after the trojan is removed from the computer.
The Win32/Alureon trojan may enable an attacker to transmit malicious data to the infected computer. Recovering from this situation may require measures beyond removing the trojan itself from the computer. Use the Microsoft Malicious Software Removal Tool, Microsoft Security Essentials, or another up-to-date scanning and removal tool to detect and remove this threat and other unwanted software from your computer. For more information on Microsoft security products, see
Restoring Corrupted Files
In some instances, Alureon may modify certain driver files such that they become corrupted and unusable. These corrupted files that will NOT be restored by detecting and removing this threat. In order to restore functionality to the computer, the corrupted file must be restored from backup. Users are advised to boot into a recovery environment and manually replace the file with a clean copy.
Restoring DNS Settings
The Domain Name System (DNS) is used (among other things) to map domain names to IP addresses - that is, to map human-readable domain names to machine-readable IP addresses. When a user attempts to visit a particular URL, a browser will use DNS servers to find the correct IP address of the requested domain. When a user is directed to a malicious server that is not part of the authoritative Domain Name System, an attacker can provide incorrect IP addresses at their choice to map to particular domain names, thus directing the user to possibly bogus or malicious sites without the affected user's knowledge.
Win32/Alureon may modify DNS settings on the host computer, thus the following steps may be required after the Win32/Alureon removal is complete:
  • If the computer has a network interface that does not receive a configuration using DHCP, reset the DNS configuration if necessary. For information on configuring TCP/IP to use DNS in Windows XP, see
  • If a dial-up connection is sometimes used from the computer, reconfigure the dial-up settings in the rasphone.pbk file as necessary, as Win32/Alureon may set the fields "IpDnsAddress" and "IpDns2Address" in the rasphone.pbk file to the attacker's address. The Microsoft scanner code that automatically removes Win32/Alureon backs up the infected dial-up configuration file to:
    %ALLUSERSPROFILE%\Application Data\Microsoft\Network\Connections\Pbk\rasphone.pbk.bak
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