A multicomponent Trojan that acts as a bot and serves the purpose of sending out spam messages. It is distributed using a dropper. Once the dropper is launched, it extracts a malicious driver and a dynamic library (DLL) from its body. The driver is planted with the %rnd%.sys name (where %rnd% is a name containing from 5 to 15 random characters) into the %SYSTEM%\drivers\ directory and is registered as the “Boot Bus Extender” service. The library, in turn, is injected into the svchost.exe and explorer.exe running processes. If the attempt to load the malicious driver fails, the dropper copies itself to the %TEMP% folder and modifies the system registry to ensure its autorun on system startup.
Once the system becomes infected, BackDoor.BlackEnergy.36 connects to a command and control center and receives from it an XML file. Based on the contents of this file, the Trojan downloads additional modules.
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.
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.
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.
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;