is a detection for system files infected by Backdoor.TidservTDSS
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
, 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:
Backdoors and What They Mean to You
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
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
-- 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
- 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.
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.