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Trojan.Spambot.11349

Added to the Dr.Web virus database: 2012-04-11

Virus description added:

A two-component Trojan consisting of a downloader written in Delphi and a dynamic-link library with the payload. The Trojan verifies that the process name contains "vcnost.e". If the process is not launched from "vcnhost.e", the malware kills all processes containing svcnost in their names.

The Trojan replicates itself to %APPDATA%\x%RND31%\svcnost.exe, where %RND31% indicates a string containing 31 random characters. Then it registers the path to svcnost.exe in the HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Init branch. After that, the malware renames %APPDATA%\x%RND31% into %APPDATA%\x%RND31%2.

The Trojan launches its copy. If it is run with administrator privileges, the Trojan modifies the system registry to bypass protection of Windows Firewall and rewrites the hosts file to block access to websites of anti-virus software developers. Moreover, the downloader loads the library with the payload into the RAM granting it control.

The Trojan reads a value from the HKCU\SOFTWARE\Microsoft\Internet Explorer\LowRegistry\SavedLegacySettingsML branch and, if an error occurs, adds 9 random digits to the value as the bot's identifier.

The library responsible for interaction with SSL is saved to %APPDATA%\desktop.ini.

The ZLIB library is saved to %APPDATA%\ntuser.dat.

The Trojan contains a code to retrieve account details for MS Outlook, The Bat!, and Windows autofill service.

Trojan.Spambot.11349 sends repetitive requests to random IP addresses chosen based on a special algorithm from the list of resources stored in the Trojan's body. After that, the Trojan establishes a connection to one of three command and control servers whose addresses are encrypted and stored in the library. Then the malicious program awaits the reply containing a configuration file.

By sending email messages containing random characters from the infected computer, the Trojan checks whether it is possible to send out spam. If the check is successful, the malicious program receives from a remote server necessary data to conduct spam mailings.

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.

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