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VBS.Igidak

(Generic component, VBS.Small.P, Worm:Win32/RJump.J, System error, VBS/Aurun.A, VBS/Small.A, Parser error, Virus.Win32.Small.k, VBS/Small.K, Trojan.VBS.Autorun.I, Small.2.Z, BAT_AUTORUN.A, Generic Script, VBS.Small.Q, VBS_AUTORUN.A, VBS/Small.E, Virus.VBS.Small.a, VBS/Small.R, BAT/Small.K, Trojan.BAT.Autorun.A, VBS/Generic)

Virus description added:

Virus type: Worm, written in Visual Basic Script

Affected OS: Win95/98/Me/2000/XP

Filesize: 1 368

Packed by: -

Technical description

  • When launched it creates the folowing files in the Windows system directory:

    AUTORUN.FCB
    Autorun.ico
    Autorun.~ex
    autorun.txt
    autorun.inf_被屏蔽木马
    autorun.inf
    autorun.reg
    Autorun.ini
    autorun.bat
    autorun.vbs
    autorun.wsh
    autorun.bin
    autorun.srm
    Autorun.exe

  • autorun.inf_?????, autorun.inf, autorun.bat, autorun.vbs are the files that impose the actual threat. The files have been added to Dr.Web virus database as VBS.Igidak

  • File autorun.reg modifies some of Windows registry keys,:it disables disaply of hidden files in Windows Explorer and adds the worm to autorun list so it is launched on Windows start-up.

    • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    "Userinit"="userinit.exe,autorun.bat"

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    "ShowSuperHidden"=dword:00000000

  • The worm copies itself to all drives (including external and network drives) available on an infected machine.

    • System recovery information

    1. Download a free curing Dr.Web CureIt! utility from an uninfected machine.
    2..Disconnect the infected computer(s) from Local area network or from the Internet.
    3. Enable display hidden and system files in any file manager.
    4. Use Dr.Web CureIt! to scan all drives. Use "Cure" option for all detected objects. Be sure to scan all external drives for VBS.Igidak Apply "Cure" option to all detected objects.
    5. Add the following keys to the registry to restore it.

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    "Userinit"="userinit.exe"

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    "ShowSuperHidden"=dword:00000001

    In you need to check the following registry kes for server versions of Windows::

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\SuperHidden
    "ValueName"="ShowSuperHidden"

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer
    \Advanced\Folder\SuperHidden\Policy\DontShowSuperHidden
    @=""

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer
    "ShowSuperHidden"=dword:00000001

    HKEY_USERS\S-1-5-21-1718174493-3167834097-4179402766-1003\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    "ShowSuperHidden"=dword:00000001

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{41a44c3f-ccb0-11db-a16f-00112f178ee0}\Shell\open\Command
    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{39f78d75-f271-11db-835a-00112f178ee0}\Shell\open\Command

    6. Delete the following files manually:

    AUTORUN.FCB
    Autorun.ico
    Autorun.~ex
    autorun.txt
    autorun.reg
    Autorun.ini
    autorun.wsh
    autorun.bin
    autorun.srm
    Autorun.exe

    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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    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.

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