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Virus:TR/Krotten.W.1
Date discovered:02/02/2006
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low
Static file:Yes
File size:54.565 Bytes
MD5 checksum:fb5c2265f8aec5ef7282ffd1e26bb1b3
VDF version:6.33.00.187
Engine version:54.565

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan.Win32.Krotten.ao


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Registry modification


Right after execution the following information is displayed:


 Registry The following registry keys are added in order to run the processes after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • AVPCC = %WINDIR%\Cursors\avp.exe
   • svchost = %WINDIR%\Web\rundll32.exe



The following registry keys including all values and subkeys are removed:
   • [HKCR\regfile\shell\open\command]
   • [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\MyComputer\NameSpace\DelegateFolders\{59031a47-3f72-44a7-89c5-5595fe6b30ee}]



The following registry keys are changed:

Various Explorer settings:
– [HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   New value:
   • NoViewOnDrive = dword:00000001
   • NoActiveDesktop = dword:00000001
   • NoDesktop = dword:00000001
   • NoSMMyDocs = dword:00000001
   • NoStartMenuMyMusic = dword:00000001
   • NoSMMyPictures = dword:00000001
   • NoCommonGroups = dword:00000001
   • NoStartMenuSubFolders = dword:00000001
   • NoStartMenuMFUprogramsList = dword:00000001
   • NoStartMenuPinnedList = dword:00000001

– [HKLM\Software\Microsoft\Windows\CurrentVersion\Explorer]
   New value:
   • NoViewContextMenu = dword:00000001

– [HKLM\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • Start_ShowRun = dword:00000000

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • Start_ShowRun = dword:00000000

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   New value:
   • NoManageMyComputerVerb = dword:00000001
   • NoNetHood = dword:00000001
   • NoPrinters = dword:00000001
   • NoPrinterTabs = dword:00000001
   • NoSMHelp = dword:00000001
   • NoThemesTab = dword:00000001
   • NoToolbarCustomize = dword:00000001
   • NoUserNameInStartMenu = dword:00000001
   • NoSaveSettings = dword:00000001
   • NoClose = dword:00000001
   • NoLogOff = dword:00000001
   • NoRecentDocsMenu = dword:00000001
   • NoFavoritesMenu = dword:00000001
   • NoFind = dword:00000001
   • NoRun = dword:00000001
   • NoDrives = dword:00000014
   • NoControlPanel = dword:00000001
   • NoViewOnDrive = dword:00000001
   • NoActiveDesktop = dword:00000001
   • NoDesktop = dword:00000001
   • NoSMMyDocs = dword:00000001
   • NoStartMenuMyMusic = dword:00000001
   • NoSMMyPictures = dword:00000001
   • NoCommonGroups = dword:00000001
   • NoStartMenuSubFolders = dword:00000001
   • NoStartMenuMFUprogramsList = dword:00000001
   • NoStartMenuPinnedList = dword:00000001

– [HKCU\Control Panel\Desktop]
   New value:
   • MenuShowDelay = 9999
   • WallpaperOriginY = 187
   • WallpaperOriginX = 210

Disable Regedit and Task Manager:
– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System]
   New value:
   • DisableRegistryTools = dword:00000001
   • NoDispCPL = dword:00000001
   • DisableTaskMgr = dword:00000001

– [HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System]
   New value:
   • DisableRegistryTools = dword:00000001
   • NoDispCPL = dword:00000001
   • DisableTaskMgr = dword:00000001

Internet Explorer's start page:
– [HKCU\Software\Microsoft\Internet Explorer\Main]
   Old value:
   • Start Page = %user defined settings%
   New value:
   • Start Page = http://poetry.rot**********

– [HKEY_LOCAL_NACHINE\Software\Microsoft\Internet Explorer\Main]
   Old value:
   • Start Page = %user defined settings%
   New value:
   • Start Page = http://poetry.rot**********

– [HKCU\Software\Microsoft\Internet Explorer\Main]
   New value:
   • NoManageMyComputerVerb = dword:00000001
   • NoNetHood = dword:00000001
   • NoPrinters = dword:00000001
   • NoPrinterTabs = dword:00000001
   • NoSMHelp = dword:00000001
   • NoThemesTab = dword:00000001
   • NoToolbarCustomize = dword:00000001
   • NoUserNameInStartMenu = dword:00000001
   • NoSaveSettings = dword:00000001
   • NoClose = dword:00000001
   • NoLogOff = dword:00000001
   • NoRecentDocsMenu = dword:00000001
   • NoFavoritesMenu = dword:00000001
   • NoFind = dword:00000001
   • NoRun = dword:00000001
   • NoDrives = dword:00000014
   • NoControlPanel = dword:00000001
   • Window title = :::::::::::::::::: ß ÏÅÒÓØÈÍÍÀß ÁËßÄÜ Ñ ÃÍÈËÎÉ ÆÎÏÎÉ ::::::::::::::::::

– [HKLM\Software\Microsoft\Internet Explorer\Main]
   New value:
   • NoManageMyComputerVerb = dword:00000001
   • NoNetHood = dword:00000001
   • NoPrinters = dword:00000001
   • NoPrinterTabs = dword:00000001
   • NoSMHelp = dword:00000001
   • NoThemesTab = dword:00000001
   • NoToolbarCustomize = dword:00000001
   • NoUserNameInStartMenu = dword:00000001
   • NoSaveSettings = dword:00000001
   • NoClose = dword:00000001
   • NoLogOff = dword:00000001
   • NoRecentDocsMenu = dword:00000001
   • NoFavoritesMenu = dword:00000001
   • NoFind = dword:00000001
   • NoRun = dword:00000001
   • NoDrives = dword:00000014
   • NoControlPanel = dword:00000001
   • Window title = :::::::::::::::::: ß ÏÅÒÓØÈÍÍÀß ÁËßÄÜ Ñ ÃÍÈËÎÉ ÆÎÏÎÉ ::::::::::::::::::

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\NonEnum]
   New value:
   • {20D04FE0-3AEA-1069-A2D8-08002B30309D} = dword:00000001

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Uninstall]
   New value:
   • NoAddRemovePrograms = dword:00000001

 File details Programming language:
The malware program was written in MS Visual C++.

Description inserted by Andrei Gherman on Wednesday, March 8, 2006
Description updated by Andrei Gherman on Wednesday, March 8, 2006

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