Trojan.Encoder.7931

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'Explorer.exe HelpMe.exe'

Creates or modifies the following files:

%ALLUSERSPROFILE%\Start Menu\Programs\Startup\desktop.ini.exe
%HOMEPATH%\Start Menu\Programs\Startup\Soft.lnk

Malicious functions:

To complicate detection of its presence in the operating system,

forces the system hide from view:

hidden files

Executes the following:

'<SYSTEM32>\HelpMe.exe'

Searches for windows to

detect analytical utilities:

ClassName: '' WindowName: 'Process Monitor - Sysinternals: www.sysinternals.com'
ClassName: 'PROCMON_WINDOW_CLASS' WindowName: ''
ClassName: '' WindowName: 'Registry Monitor - Sysinternals: www.sysinternals.com'
ClassName: 'RegmonClass' WindowName: ''
ClassName: '' WindowName: 'File Monitor - Sysinternals: www.sysinternals.com'
ClassName: 'GBDYLLO' WindowName: ''
ClassName: 'OLLYDBG' WindowName: ''
ClassName: 'FilemonClass' WindowName: ''
ClassName: 'pediy06' WindowName: ''

Modifies file system:

Creates the following files:

%ALLUSERSPROFILE%\Start Menu\Programs\Games\Spider Solitaire.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Games\Solitaire.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\MSN.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Windows Movie Maker.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Windows Messenger.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Games\Pinball.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Games\Internet Hearts.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Games\Internet Checkers.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Games\Internet Reversi.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Games\Minesweeper.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Games\Internet Spades.lnk.exe
C:\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Media Player\CurrentDatabase_59R.wmdb.exe
C:\Documents and Settings\Default User\Cookies\index.dat.exe
C:\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows Media\9.0\WMSDKNS.DTD.exe
C:\Documents and Settings\Default User\Local Settings\desktop.ini.exe
C:\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows Media\9.0\WMSDKNS.XML.exe
C:\Documents and Settings\Default User\Application Data\Microsoft\Internet Explorer\brndlog.txt.exe
%ALLUSERSPROFILE%\Start Menu\Windows Catalog.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Set Program Access and Defaults.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Windows Update.lnk.exe
C:\Documents and Settings\Default User\Application Data\Microsoft\Internet Explorer\brndlog.bak.exe
C:\Documents and Settings\Default User\Application Data\desktop.ini.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Administrative Tools\Component Services.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\WordPad.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Administrative Tools\Computer Management.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Administrative Tools\desktop.ini.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Administrative Tools\Data Sources (ODBC).lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\System Tools\System Restore.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\System Tools\Files and Settings Transfer Wizard.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\System Tools\Disk Defragmenter.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\System Tools\Scheduled Tasks.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\System Tools\System Information.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\System Tools\Security Center.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Games\desktop.ini.exe
%ALLUSERSPROFILE%\Start Menu\Programs\desktop.ini.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Games\Freecell.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Games\Internet Backgammon.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Games\Hearts.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Administrative Tools\Services.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Administrative Tools\Local Security Policy.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Administrative Tools\Event Viewer.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Administrative Tools\Microsoft .NET Framework 1.1 Configuration.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Administrative Tools\Performance.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Administrative Tools\Microsoft .NET Framework 1.1 Wizards.lnk.exe
C:\Documents and Settings\Default User\Local Settings\History\desktop.ini.exe
C:\Documents and Settings\Default User\Start Menu\Programs\Accessories\Windows Explorer.lnk.exe
C:\Documents and Settings\Default User\Start Menu\Programs\Accessories\Tour Windows XP.lnk.exe
C:\Documents and Settings\Default User\Start Menu\Programs\desktop.ini.exe
C:\Documents and Settings\Default User\Start Menu\Programs\Startup\desktop.ini.exe
C:\Documents and Settings\Default User\Start Menu\Programs\Remote Assistance.lnk.exe
C:\Documents and Settings\Default User\Start Menu\Programs\Accessories\Synchronize.lnk.exe
C:\Documents and Settings\Default User\Start Menu\Programs\Accessories\Entertainment\desktop.ini.exe
C:\Documents and Settings\Default User\Start Menu\Programs\Accessories\desktop.ini.exe
C:\Documents and Settings\Default User\Start Menu\Programs\Accessories\Entertainment\Windows Media Player.lnk.exe
C:\Documents and Settings\Default User\Start Menu\Programs\Accessories\Program Compatibility Wizard.lnk.exe
C:\Documents and Settings\Default User\Start Menu\Programs\Accessories\Notepad.lnk.exe
C:\Documents and Settings\Default User\Templates\quattro.wb2.exe
C:\Documents and Settings\Default User\Templates\presenta.shw.exe
C:\Documents and Settings\Default User\Templates\sndrec.wav.exe
C:\Documents and Settings\Default User\Templates\wordpfct.wpg.exe
C:\Documents and Settings\Default User\Templates\wordpfct.wpd.exe
C:\Documents and Settings\Default User\Templates\powerpnt.ppt.exe
C:\Documents and Settings\Default User\Templates\amipro.sam.exe
C:\Documents and Settings\Default User\Start Menu\Programs\Windows Media Player.lnk.exe
C:\Documents and Settings\Default User\Templates\excel.xls.exe
C:\Documents and Settings\Default User\Templates\lotus.wk4.exe
C:\Documents and Settings\Default User\Templates\excel4.xls.exe
C:\Documents and Settings\Default User\Local Settings\<INETFILES>\Content.IE5\U98D4X8H\desktop.ini.exe
C:\Documents and Settings\Default User\Local Settings\<INETFILES>\Content.IE5\KHMHGZ4F\desktop.ini.exe
C:\Documents and Settings\Default User\Local Settings\<INETFILES>\Content.IE5\YPORKZYZ\desktop.ini.exe
C:\Documents and Settings\Default User\NTUSER.DAT.exe
C:\Documents and Settings\Default User\Local Settings\<INETFILES>\desktop.ini.exe
C:\Documents and Settings\Default User\Local Settings\<INETFILES>\Content.IE5\index.dat.exe
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\_filelst.cfg
C:\Documents and Settings\Default User\Local Settings\History\History.IE5\desktop.ini.exe
C:\Documents and Settings\Default User\Local Settings\History\History.IE5\index.dat.exe
C:\Documents and Settings\Default User\Local Settings\<INETFILES>\Content.IE5\desktop.ini.exe
C:\Documents and Settings\Default User\Local Settings\<INETFILES>\Content.IE5\2VAZY7AN\desktop.ini.exe
C:\Documents and Settings\Default User\Start Menu\Programs\Accessories\Accessibility\Narrator.lnk.exe
C:\Documents and Settings\Default User\Start Menu\Programs\Accessories\Accessibility\Magnifier.lnk.exe
C:\Documents and Settings\Default User\Start Menu\Programs\Accessories\Accessibility\On-Screen Keyboard.lnk.exe
C:\Documents and Settings\Default User\Start Menu\Programs\Accessories\Command Prompt.lnk.exe
C:\Documents and Settings\Default User\Start Menu\Programs\Accessories\Accessibility\Utility Manager.lnk.exe
C:\Documents and Settings\Default User\Start Menu\Programs\Accessories\Accessibility\desktop.ini.exe
C:\Documents and Settings\Default User\SendTo\Desktop (create shortcut).DeskLink.exe
C:\Documents and Settings\Default User\SendTo\Compressed (zipped) Folder.ZFSendToTarget.exe
C:\Documents and Settings\Default User\SendTo\desktop.ini.exe
C:\Documents and Settings\Default User\Start Menu\desktop.ini.exe
C:\Documents and Settings\Default User\SendTo\Mail Recipient.MAPIMail.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\guitar.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\frog.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\horses.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\lift-off.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\kick.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\fish.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\dirt bike.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\chess.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\dog.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\duck.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\drip.bmp.exe
%ALLUSERSPROFILE%\Documents\desktop.ini.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\%USERNAME%.bmp.exe
%ALLUSERSPROFILE%\Documents\My Music\Desktop.ini.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Music\desktop.ini.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Music\Beethoven's Symphony No. 9 (Scherzo).wma.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\guest.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\pink flower.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\palm tree.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\red flower.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\snowflake.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\skater.bmp.exe
C:\DbgLog.log.exe
C:\CONFIG.SYS.exe
%ALLUSERSPROFILE%\Application Data\desktop.ini.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\Dr Watson\drwtsn32.log.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\RSA\S-1-5-18\d42cc0c3858a58db2db37658219e6400_23ef5514-3059-436f-a4a7-4cefaab20eb1.exe
C:\boot.ini.exe
C:\AutoRun.exe
<SYSTEM32>\HelpMe.exe
C:\AUTORUN.INF
C:\AUTORUN.INF.exe
C:\AUTOEXEC.BAT.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\beach.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\ball.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\butterfly.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\cat.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\car.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\astronaut.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\Media Player\UserMigratedStore_59R.bin.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\Media Player\DefaultStore_59R.bin.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\Network\Connections\Pbk\rasphone.pbk.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\airplane.bmp.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\Network\Connections\Pbk\sharedaccess.ini.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Music\New Stories (Highway Blues).wma.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Communications\HyperTerminal.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Communications\desktop.ini.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Communications\Network Connections.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Communications\New Connection Wizard.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Communications\Network Setup Wizard.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Calculator.lnk.exe
%ALLUSERSPROFILE%\DRM\drmv2.sst.exe
%ALLUSERSPROFILE%\DRM\drmv2.lic.exe
%ALLUSERSPROFILE%\Start Menu\desktop.ini.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Accessibility\desktop.ini.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Accessibility\Accessibility Wizard.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\System Tools\Backup.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Paint.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\System Tools\Character Map.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\System Tools\Disk Cleanup.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\System Tools\desktop.ini.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Entertainment\Volume Control.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Communications\Wireless Network Setup Wizard.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Communications\Remote Desktop Connection.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\desktop.ini.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Entertainment\Sound Recorder.lnk.exe
%ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Entertainment\desktop.ini.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\0338E140\Plylst2.wpl.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\0338E140\Plylst15.wpl.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\0338E140\Plylst3.wpl.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\0338E140\Plylst5.wpl.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\0338E140\Plylst4.wpl.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\0338E140\Plylst14.wpl.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\0338E140\Plylst10.wpl.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\0338E140\Plylst1.wpl.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\0338E140\Plylst11.wpl.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\0338E140\Plylst13.wpl.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\0338E140\Plylst12.wpl.exe
%ALLUSERSPROFILE%\Documents\My Pictures\Sample Pictures\Sunset.jpg.exe
%ALLUSERSPROFILE%\Documents\My Pictures\Sample Pictures\desktop.ini.exe
%ALLUSERSPROFILE%\Documents\My Pictures\Sample Pictures\Water lilies.jpg.exe
%ALLUSERSPROFILE%\Documents\My Videos\Desktop.ini.exe
%ALLUSERSPROFILE%\Documents\My Pictures\Sample Pictures\Winter.jpg.exe
%ALLUSERSPROFILE%\Documents\My Pictures\Sample Pictures\Blue hills.jpg.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\0338E140\Plylst7.wpl.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\0338E140\Plylst6.wpl.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\0338E140\Plylst8.wpl.exe
%ALLUSERSPROFILE%\Documents\My Pictures\Desktop.ini.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\0338E140\Plylst9.wpl.exe

Sets the 'hidden' attribute to the following files:

C:\AUTORUN.INF
C:\AutoRun.exe

Deletes the following files:

C:\AUTORUN.INF

Changes user data files extensions (Trojan.Encoder).

Miscellaneous:

Searches for the following windows:

ClassName: 'Shell_TrayWnd' WindowName: ''
ClassName: '18467-41' WindowName: ''

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