1 of 4
Danger level 8
Type: Trojans
Common infection symptoms:
  • Slow Computer
  • System crashes
  • Connects to the internet without permission
  • Installs itself without permissions
  • Can't be uninstalled via Control Panel


Backdoor.teamviewer, is a Trojan backdoor malware infection as its name suggests, which can easily put your virtual security at risk. This is a dangerous threat since as a backdoor it is almost invisible and can be used for different purposes by cyber criminals once this infection is installed. Its presence may be an indication that other malware infections are also present on your computer, including other Trojans. Since this backdoor program can be used for criminal activities that may incriminate you as well without your knowledge, you should remove Backdoor.teamviewer immediately. This infection can be very deceiving as it also installs two legitimate applications. However, leaving it on your system could cause major security-related issues. Let us tell you more in details so that you understand what you are up against if this malware has found a way to enter your PC.

Our research shows that this backdoor is actually distributed by another Trojan horse infection called Trojan.MulDrop6.39120. This is indeed a rogue Adobe Flash driver update that is promoted by certain suspicious websites and corrupt third-party ads, such as banners and pop-ups. It is essential that you understand how you may end up clicking on such a fake updater so that you can avoid similar attacks next time. One of the possibilities is that there is an adware program on your computer that displays unsafe third-party ads. While you are browsing the web, you are introduced to an infected banner or pop-up ad that may look like a system notification warning you to update your Flash driver/player because of security reasons, for example. Since you may not even think that it is a malicious advertisement, you click on the Install or OK button and this is how you begin the installation of this backdoor.

The same is true for visiting shady websites that host a number of third-party ads, including gaming, dating, torrent, and shareware sites. Landing on such pages can also hold the danger of getting infected with Backdoor.teamviewer. Similarly, you can be presented with a banner or pop-up ad disguised as a system warning. We suggest that you steer clear of such suspicious websites and clicking on third-party ads as well to be on the safe side. When it comes to Adobe Flash updates or downloading any software or free tools, you should always use official websites as your source. We hope that it is getting clear that why it is important to delete Backdoor.teamviewer right now and run a full-system malware scan to find all other potential threats.

When you take the bait and run the fake Flash installer, you actually install a legitimate version of Adobe Flash and a remote desktop application called TeamViewer, which is used by this backdoor as a shield. You need to know that such an infection can be very serious. There are three main purposes for cyber criminals to infect your computer with backdoor programs. First, they want to infect your computer with other malware threats that this backdoor can download and install. Second, criminals can use your computer as a proxy. This is probably the worst that can happen to you since it would mean that Backdoor.teamviewer can be used to relay web traffic from the Command and Control server to other servers. In other words, your PC may be used to act as a tool to mask the real IP addresses crooks use. This way they can commit all kinds of online frauds and scams without being detected or caught. This simply means that the signs will point in your direction when it comes to the question: “Who committed the crime?” Finally, backdoors may also be used by criminals as a tool to do all kinds of vicious acts on your computer, including modifying, deleting files, and much more.

We have noticed that Backdoor.teamviewer may not be used for the latter option, but most likely for the first two. We hope that you can see how dangerous it can be if your computer has got infected with this severe threat. That is why we believe that you should remove Backdoor.teamviewer as soon as possible. The longer you wait the more chance this malicious program has to cause harm to you and your computer.

The good news is that it is not too complicated to delete Backdoor.teamviewer from your system. Although it has no uninstaller that you could easily use through Control Panel, it is still not rocket science. All you need to do is actually delete the folder it creates. Since this folder may be hidden, first you need to make sure that your File Explorer is set to display hidden files. It is possible that certain versions drop a few files in your %Appdata% directory as well without a folder, such as winmm.dll, so you should also check for suspicious files there. Please follow our instructions below to eliminate this ugly threat. If you are a security-minded user and want to efficiently protect your system from similar malware infections, we recommend that you use a reliable anti-malware program, such as SpyHunter.

Display hidden and system protected files

Windows XP

  1. Open Windows File Explorer.
  2. Open the Tools tab.
  3. Select Folder Options from the menu.
  4. Select the View tab.
  5. In the Advanced Settings list, find Show hidden files and folders and mark it.
  6. Uncheck the box next to Hide protected operating system files (Recommended).
  7. Click Apply.

Windows 7/Vista

  1. Tap the Windows key + E on your keyboard.
  2. Click Organize and select Folder and search options.
  3. Open the View tab.
  4. In the Advanced Settings list, find Show hidden files and folders, and put a tick next to it.
  5. Untick Hide protected operating system files (Recommended).
  6. Click Apply.

Windows 8/8.1/10

  1. Press Win+Q and type in Control Panel. Hit Enter.
  2. Click Appearance and Personalization.
  3. Select Show hidden files and folders under the Folder Options.
  4. In the Advanced list, select the button labeled Show hidden files, folders, and drives.
  5. Remove the check mark from the checkbox labeled Hide protected operating system files (Recommended).
  6. Click Apply.

How to remove Backdoor.teamviewer from Windows

  1. Press Win+E.
  2. Locate and delete %Appdata%\Sin folder.
  3. Check the %Appdata% directory for suspicious files (winmm.dll) and bin them.
  4. Empty your Recycle Bin.
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