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Added to the Dr.Web virus database: 2016-05-06

Virus description added:


  • aeed844d2e7e27b8d2994c087c4148286aae3434 (NSIS, a bogus FlashPlayer)
  • d911554891f18d58f32c7e68a026e212206d2226 (NSIS, a dropper)

A dropper that is spread under the guise of the Adobe Flash Player update and is designed to covertly install BackDoor.TeamViewer.49 on the computer.

The installation script unpacks flashplayer21_xa_install.exe (a legitimate installer of Adobe Flash Player) and flashplayer_install.exe (the dropper of BackDoor.TeamViewer.49) and saves them on the disc. Then it runs them every 3 seconds and removes the original flashplayer_install.exe file.

The dropper represents a file in the Nullsoft Scriptable Install System (NSIS) format that contains a password-protected 7z archive. Before the dropper is launched, it checks the system for the presence of the following running processes: AvastUI.exe, avastui.exe, sin\5s.exe, 5s.exe, and \Pin\5s.lnk. If it fails to detect one of them, the dropper terminates its operation displaying the error message that looks as follows: "Error! Can't initialize plug-ins directory. Please try again later".

The archive contains the following files that are then unpacked to the %APPDATA%\Sin\ directory:

News about the Trojan

Curing recommendations

  1. If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space.
  2. If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.
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After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

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  1. If the mobile device is operating normally, download and install Dr.Web for Android. Run a full system scan and follow recommendations to neutralize the detected threats.
  2. If the mobile device has been locked by Android.Locker ransomware (the message on the screen tells you that you have broken some law or demands a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
    • Load your smartphone or tablet in the safe mode (depending on the operating system version and specifications of the particular mobile device involved, this procedure can be performed in various ways; seek clarification from the user guide that was shipped with the device, or contact its manufacturer);
    • Once you have activated safe mode, install the Dr.Web for Android onto the infected handheld and run a full scan of the system; follow the steps recommended for neutralizing the threats that have been detected;
    • Switch off your device and turn it on as normal.

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