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rootkit removal


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#1 kumi1

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Posted 26 October 2010 - 12:47 PM

my windows xp computer is infected with a file that norton finds (only in safe mode) and identifies as "backdoor.tidserv.l!inf" -- norton says it has to be a manual fix. what i have done so far:
1. followed norton's instructions, turned off windows xp system restore, ran norton -- it found nothing when not in safe mode
2. ran again in safe mode and it found the file again
3. followed the path to the infected file: c:\Windows\system32\drivers\serial.sys, and deleted it (per some advice on the web -- i'm not using the serial port anyway)
but the issue is still there -- can't send/receive mail via outlook (error message: Task ... reported error (0x80040900) : 'The server name you entered cannot be found on the network (it might be down temporarily). Verify that you are online and that the server name is correct.' can't run spybot, can't update java (removed per earlier advice), and websites either don't appear or redirect.
Any advice on removing this?

Edited by hamluis, 26 October 2010 - 01:01 PM.
Moved from XP forum to Am I Infected ~Hamluis.


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#2 quietman7

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Posted 26 October 2010 - 01:48 PM

IMPORTANT NOTE: Backdoor.Tidserv!inf is a detection for system files infected by Backdoor.Tidserv

TDSS, TDL3/TDL4 is the third and fourth generation of TDSS which uses rootkit technology to hide itself on a system by infecting system files/drivers like atapi.sys which is a common target because it loads early during the boot process and is difficult to detect. Newer varinats, however, can target a number of other legitimate drivers in the Windows drivers folder. Common symptoms/signs of this infection include:
  • Google search results redirected as TDL3 modifies DNS query results.
  • Infected (patched/forged) files in the Windows drivers folder.
  • Slowness of the computer and poor performance.
  • Multiple instances of IEXPLORE.exe in Task Manager.
  • Internet Explorer opens on its own.
  • BSODs as described in this article.
For more specific analysis and explanation of the infection, please refer to: TDL3: The Rootkit of All Evil?

Rootkits, backdoor Trojans, Botnets, and IRCBots are very dangerous because they compromise system integrity by making changes that allow it to be used by the attacker for malicious purposes. Rootkits are used by backdoor Trojans to conceal its presence (hide from view) in order to prevent detection of an attacker's software and make removal more difficult. Many rootkits can hook into the Windows 32-bit kernel, and patch several APIs to hide new registry keys and files they install. They can disable your anti-virus and security tools to prevent detection and removal. Remote attackers use backdoors as a means of accessing and taking control of a computer that bypasses security mechanisms. This type of exploit allows them to steal sensitive information like passwords, personal and financial data which is then sent back to the hacker.

Many experts in the security community believe that once infected with this type of malware, the best course of action is to wipe the drive clean, reformat and reinstall the OS. Please read:

Whenever a system has been compromised by a backdoor payload, it is impossible to know if or how much the backdoor has been used to affect your system...There are only a few ways to return a compromised system to a confident security configuration. These include:
• Reimaging the system
• Restoring the entire system using a full system backup from before the backdoor infection
• Reformatting and reinstalling the system

Backdoors and What They Mean to You

This is what Jesper M. Johansson at Microsoft TechNet has to say: Help: I Got Hacked. Now What Do I Do?.

The only way to clean a compromised system is to flatten and rebuild. That’s right. If you have a system that has been completely compromised, the only thing you can do is to flatten the system (reformat the system disk) and rebuild it from scratch (reinstall Windows and your applications).


Should you decide not to follow that advice, we will do our best to help clean the computer of any infections but we cannot guarantee it to be trustworthy or that the removal will be successful. If you wish to proceed, please do the following.

Please follow these instructions: How to remove Google Redirects or the TDSS, TDL3, Alureon rootkit using TDSSKiller
  • Double-click on TDSSKiller.exe to run the tool for known TDSS variants.
    Vista/Windows 7 users right-click and select Run As Administrator.
  • When the program opens, click the Start Scan button.
  • If malicious objects are found, they will show in the Scan results - Select action for found objects and offer three options.
  • Ensure Cure is selected, then click Continue > Reboot now to finish the cleaning process. <- Important!!
    Note: If 'Suspicious' objects are detected, you will be given the option to Skip or Quarantine. Skip will be the default selection.
  • A log file named TDSSKiller_version_date_time_log.txt will be created and saved to the root directory (usually Local Disk C:).
  • Copy and paste the contents of that file in your next reply.
-- For any files detected as 'Suspicious' (except those identified as Forged to be cured after reboot) get a second opinion by submitting to Jotti's virusscan or VirusTotal. In the "File to upload & scan" box, browse to the location of the suspicious file and submit (upload) it for scanning/analysis.

Step 9 recommends that you scan your computer using MalwareBytes to remove any traces that may still be present. If you performed that step, please post the complete results of your scan for review.
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