Defend what you create

Other Resources


My library

+ Add to library

Contact us
24/7 Tech support | Rules regarding submitting

Send a message

Your tickets



Added to the Dr.Web virus database: 2012-07-29

Virus description added:

A multicomponent rootkit Trojan that, among other distribution methods, exploits the CVE-2012-4681 vulnerability in Java. The dropper is equipped with anti-debugging features.

Once it penetrates a computer, the dropper saves the Trojan's core module with the %s-%u.exe name mask to %TEMP%. For example, the module can be saved under the 5aAAA-9.exe name, at the beginning of which is a random string of characters (from 4 to 8) followed by the Trojan's ID (%u) that is also used in search queries generated by the malware.

If the Trojan has sufficient privileges, it infects the %systemroot%\system32\drivers\fastfat.sys driver to conceal the presence of the core module in the system. To acquire elevated privileges, the malware exploits OS vulnerabilities. The Trojan disables UAC in both 32-bit and 64-bit versions of Windows. It can also change Firefox and Internet Explorer settings. For the latter, the Trojan installs an additional search plug-in (search.xml) in the \searchplugins\ folder modifying the settings of the default search engine using prefs.js. As a result, all search queries sent from the infected system look as follows:{search query}, where %d stands for the Trojan's unique identifier.

The malicious program modifies %systemroot% \system32\drivers\etc\hosts as follows:


The core module serves the purpose of intercepting traffic on the compromised computer.

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.
Download Dr.Web

Download by serial number

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.

Download Dr.Web

Download by serial number

  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

The Russian developer of Dr.Web anti-viruses
Doctor Web has been developing anti-virus software since 1992
Dr.Web is trusted by users around the world in 200+ countries
The company has delivered an anti-virus as a service since 2007
24/7 tech support

Dr.Web © Doctor Web
2003 — 2021

Doctor Web is the Russian developer of Dr.Web anti-virus software. Dr.Web anti-virus software has been developed since 1992.

2-12А, 3rd street Yamskogo polya, Moscow, Russia, 125124