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Trojan.DownLoader4.8890

Added to the Dr.Web virus database: 2011-07-10

Virus description added:

Technical Information

Malicious functions:
Creates and executes the following:
  • <Full path to virus>.exe 
Executes the following:
  • <SYSTEM32>\sc.exe delete DefWatch
  • <SYSTEM32>\sc.exe delete Symantec AntiVirus
  • <SYSTEM32>\sc.exe delete a2free
  • <SYSTEM32>\sc.exe delete Vba32Ldr
  • <SYSTEM32>\sc.exe delete InoRT
  • <SYSTEM32>\sc.exe delete SAVSService
  • <SYSTEM32>\sc.exe delete VSSERV
  • <SYSTEM32>\sc.exe delete Sophos Client Firewall
  • <SYSTEM32>\sc.exe delete Sophos AutoUpdate Service
  • <SYSTEM32>\sc.exe delete AntiVirWebService
  • <SYSTEM32>\sc.exe delete ABMainSV
  • <SYSTEM32>\sc.exe delete SOLOSCAN
  • <SYSTEM32>\net1.exe share share=%WINDIR%\system\verona
  • <SYSTEM32>\sc.exe delete
  • <SYSTEM32>\sc.exe delete VACompManService
  • <SYSTEM32>\sc.exe delete ewido security suite guard
  • <SYSTEM32>\sc.exe delete AntiVirService
  • <SYSTEM32>\sc.exe delete PavPrSrv
  • <SYSTEM32>\sc.exe delete ewido security suite control
  • <SYSTEM32>\sc.exe delete F-Secure Gatekeeper Handler Starter
  • <SYSTEM32>\sc.exe delete FSORSPClient
  • <SYSTEM32>\sc.exe delete cmdAgent
  • <SYSTEM32>\sc.exe delete AVP
  • <SYSTEM32>\sc.exe delete FSMA
  • <SYSTEM32>\sc.exe delete wscsvc
  • <SYSTEM32>\sc.exe delete wuauserv
  • <SYSTEM32>\sc.exe delete FSDFWD
  • <SYSTEM32>\sc.exe delete SharedAccess
  • <SYSTEM32>\sc.exe delete avast! Antivirus
  • <SYSTEM32>\sc.exe delete GuardX
  • <SYSTEM32>\sc.exe delete NOD32Krn
  • <SYSTEM32>\sc.exe delete bdss
  • <SYSTEM32>\sc.exe delete DrWebEngine
  • <SYSTEM32>\sc.exe delete vsmon
  • <SYSTEM32>\sc.exe delete avast! Mail Scanner
  • <SYSTEM32>\sc.exe delete aswUpdSv
  • <SYSTEM32>\sc.exe delete acssrv
  • <SYSTEM32>\sc.exe delete avast! Web Scanner
Modifies file system :
Creates the following files:
  • %HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\69I9OPW5\err[1].php
  • %WINDIR%\system\verona\mp9.exe
  • <Full path to virus>.exe
Deletes the following files:
  • <Full path to virus>.exe
Network activity:
Connects to:
  • 'www.gr####ostat.info':80
TCP:
HTTP GET requests:
  • www.gr####ostat.info/v1/err.php?id########
UDP:
  • DNS ASK www.gr####ostat.info
Miscellaneous:
Searches for the following windows:
  • ClassName: 'Shell_TrayWnd' WindowName: ''

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.

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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.

Find out more about Dr.Web for Android

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