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Added to the Dr.Web virus database: 2012-09-14

Virus description added:

A two-component Trojan whose main purpose is to perform web injections. It consists of a dropper and a malicious library.

The Trojan creates the %MYDOCUMENTS%\IntMayak folder and saves the decrypted DLL into %MYDOCUMENTS%\IntMayak\0103.tmp. Then it creates %MYDOCUMENTS%\IntMayak\T01emp01.reg.

After that, the Trojan runs a search for the explorer.exe process and injects a malicious code into it. The code copies 0103.tmp to %SYSTEM32% with a name generated based on the serial number of the first partition of the hard disk.

Then the Trojan runs regedit.exe injecting the REG file, which was created earlier, into it. Using this file, the library is registered in the following branch: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows] "AppInit_DLLs" = "%SYSTEM32%\%name%.dll".

Then the dropper deletes temporary files and the IntMayak folder. Moreover, to conceal the way of penetrating the system, the malicious program deletes cookies and clears Internet Explorer cache.

The malicious library is compatible with Internet Explorer, Opera, Firefox, and Chrome.

While operating, Trojan.Mayachok.17727 saves an encrypted configuration file to a hard drive. The file contains command and control server addresses, a script that the malware injects into webpages browsed by the user, and other parameters.

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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Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.

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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