1. Symantec/
  2. Security Response/
  3. Backdoor.Tidserv.M


Risk Level 1: Very Low

January 14, 2011
August 15, 2012 10:34:30 AM
Infection Length:
123 kilobytes
Systems Affected:
Windows 2000, Windows 7, Windows NT, Windows Server 2003, Windows Server 2008, Windows Vista, Windows XP
When the Trojan executes, it copies itself to the following locations:
  • %Temp%\1.tmp
  • %Temp%\2.tmp

It then infects the compromised computer's Master Boot Record (MBR).

When the compromised computer is restarted, the infected MBR (detected as Boot.Tidserv.B) patches the BIOS disk functions which in turn patch the Windows kernel to load a malicious driver stored in the threat's encrypted file system located at the end of disk.

The Trojan then opens a back door on the compromised computer. The back door includes functionality to download additional components based on instructions received from the following URLs:
  • [https://]lkaturl71.com
  • [https://]69b69b6b96b.com
  • [https://]ikaturi11.com
  • [https://]countri1l.com
  • [https://]1il1il1il.com
  • [http://]gnarenyawr.com
  • [http://]rinderwayr.com
  • [http://]jukdoout0.com
  • [http://]swltcho0.com
  • [http://]ranmjyuke.com

Next, the Trojan installs a rootkit that performs the following actions:
  • Hide the Trojan's files in the last sectors of the drive
  • Hide the injected MBR and serve a clean MBR upon request
  • Hide the Trojan's driver in the kernel
  • Inject a malicious .dll file into the user mode processes

The Trojan then monitors keywords sent to the following sites:
  • google.com
  • yahoo.com
  • bing.com
  • live.com
  • msn.com
  • altavista.com
  • ask.com
  • exalead.com
  • excite.com
  • dogpile.com
  • metacrawler.com
  • webcrawler.com
  • alltheweb.com
  • lycos.com
  • gigablast.com
  • cuil.com
  • aol.com
  • entireweb.com
  • search.com
  • mamma.com
  • mytalkingbuddy.com
  • about.com
  • myspace.com
  • answers.com
  • conduit.com
  • alexa.com
  • alltheinternet.com
  • blinkx.com
  • macromedia.com
  • adobe.com
  • amazon.com
  • facebook.com
  • youtube.com
  • wikipedia.org
  • wikimedia.org
  • twitter.com
  • aolcdn.com
  • othersonline.com
  • everesttech.net
  • adrevolver.com
  • tribalfusion.com
  • adbureau.net
  • abmr.net
  • gstatic.com
  • virtualearth.net
  • atdmt.com
  • ivwbox.com
  • powerset.net
  • yimg.com
  • 2mdn.net
  • doubleclick.net
  • iwon.com
  • scorecardresearch.com
  • ytimg.com
  • infospace.com
  • edgesuite.net
  • superpages.com
  • lygo.com
  • compete.com
  • firmserve.com
  • worthathousandwords.com
  • yieldmanager.com
  • wazizu.com
  • meedea.com
  • atwola.com
  • doubleverify.com
  • tacoda.net
  • truveo.com
  • openx.org
  • adcertising.com
  • twimg.com
  • picsearch.com
  • oneriot.com
  • .com.com
  • flickr.com
  • searchvideo.com
  • .tqn.com
  • myspacecdn.com
  • fimservecdn.com
  • alexametrics.com

It also injects a code snippet, which appears to be part of a pay-per-click scheme.


Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.
Writeup By: Karthik Selvaraj
Summary| Technical Details| Removal

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