Virus:Worm/Agent.184320
Date discovered:10/10/2006
Type:Worm
In the wild:No
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Low to medium
Static file:Yes
File size:298.528 Bytes
MD5 checksum:8a1b5f56799b7bcc1751055e93c933a8
VDF version:6.36.01.54
IVDF version:6.36.01.57 - Monday, November 20, 2006

 General Method of propagation:
   • Email


Aliases:
   •  Kaspersky: Virus.Win32.VB.bp
   •  TrendMicro: WORM_VB.BOE
   •  Sophos: W32/Rungbu-B


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


Side effects:
   • Drops a file
   • Drops a malicious file
   • Registry modification


Right after execution it runs a windows application which will display the following window:


 Files It copies itself to the following locations:
   • C:\lsass.exe
   • %SYSDIR%\dllhost.com
   • %WINDIR%\setup\dllhost.com
   • %HOME%\My Documents\Rated R Pictures.com
   • %WINDIR%\lsass.exe.exe
   • %WINDIR%\AutoRun.ini
   • %WINDIR%\MsWord.exe
   • %PROGRAM FILES%\philconst.exe
   • %WINDIR%\Downloaded Program Files\philconst.exe
   • %deleted file%.scr



It creates the following directory:
   • %HOME%\My Documents\Rated R Pictures



It deletes files that contain one of the following substring:
   • .doc
   • .rtf



The following files are created:

– Non malicious files:
   • %malware executiondirectory%\%executed file%.doc
   • %WINDIR%\OUTSETTN.REG

– %PROGRAM FILES%\microsoft frontpage\outlook.vbs Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: HEUR/Worm.Outlook.VBS

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

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\
   Run
   • @="%SYSDIR%\dllhost.com"

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   • @="\lsass.exe"
   • "WinRun"="%WINDIR%\AutoRun.ini"



The following registry keys are added:

– HKCR\datfile\shell\open\command
   • @="\"%WINDIR%\setup\dllhost.com\" %1"

– KEY_CLASSES_ROOT\artfile\shell\open\command
   • @="\"%WINDIR%\setup\dllhost.com\" %1"

– HKCR\piffile\shell\open\command
   • @="\"%WINDIR%\setup\dllhost.com\" %1"

– HKCR\AVIFile\shell\open\command
   • @="\"%WINDIR%\setup\dllhost.com\" %1"

– HKCR\exefile
   • "NeverShowExt"=""

– HKCR\scrfile
   • @="Microsoft Word Document"
   • "NeverShowExt"=""

– HKCR\batfile
   • "NeverShowExt"=""

– HKCR\comfile
   • @="File Folder"

– HKCR\comfile\DefaultIcon
   • @=%SystemRoot%\System32\shell32.dll,3

– HKLM\SOFTWARE\Microsoft\Shared Tools\MSConfig\MSCrusher
   • "command"="shutdown -s -f -t 0"
   • "hkey"="HKCR"
   • "inimapping"="0"
   • "item"="Shutdowm"
   • "key"="batfile\\shell\\edit\\command"

– HKLM\SOFTWARE\Microsoft\Windows\System\DarkAngel
   • "Expiration-Bug"="3011"

– HKCR\batfile\shell\edit\command
   • @="shutdown -s -f -t 0"

– HKCR\inifile\shell\open\command
   • @="%1" %*"

– HKLM\SYSTEM\CurrentControlSet\Control\TimeZoneInformation
   • "ActiveTimeBias"=dword:ffffff88



The following registry keys are changed:

Various Explorer settings:
– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer
   Old value:
   • "NoFolderOptions"=dword:00000000
   • "NoRun"=dword:00000000
   New value:
   • "NoFolderOptions"=dword:00000001
   • "NoRun"=dword:00000001

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\HideFileExt
   New value:
   • "CheckedValue"=dword:00000001

Disable Regedit and Task Manager:
– HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System
   Old value:
   • "DisableRegistryTools"=dword:00000000
   New value:
   • "DisableRegistryTools"=dword:00000001

 Email From:
The sender address is the user's Outlook account.


To:
– Email addresses gathered from WAB (Windows Address Book)


Subject:
The following:
   • Read my letter for you



Body:
The body of the email is the following:
   • this was created from the deep inside my heart.


Attachment:

The attachment is a copy of the malware itself.

 Process termination List of processes that are terminated:
   • explorer.exe; avgctrl.exe; avgamsvr.exe; avgserv.exe; avginet.exe;
      avgupsvc.exe; avgemc.exe; avgnt.exe; avgregcl.exe; avgserv9.exe;
      avgw.exe; alogserv.exe; avsynmgr.exe; Mpfsheild.exe; MpfAgent.exe;
      mpf.exe; MpfConsole.exe; mcagent.exe; mcappins.exe; McDash.exe;
      mcdetect.exe; mcinfo.exe; mcmnhdlr.exe; mcshield.exe; mctskshd.exe;
      mcupdate.exe; mcvsescn.exe; mcvsshld.exe; mcvsftsn.exe; mcvsrte.exe;
      vstskmgr.exe; vsmain.exe; vshwin32.exe; pccpfw.exe; pccclient.exe;
      pcclient.exe; pccguide.exe; pccnt.exe; pccntmon.exe; pccntupd.exe;
      PcCtlCom.exe; pcscan.exe; avpm.exe; avpcc.exe; kav.exe; kavmm.exe;
      kavsvc.exe; AVENGINE.EXE; nisserv.exe; NISUM.exe; Navapsvc.exe;
      NMain.exe; Navapw32.exe; VetMsg.exe; VetTray.exe; Vet32.exe;
      VetNT.exe; vsmon.exe; zlclient.exe; zapro.exe; zonealarm.exe;
      APVXDWIN.EXE; AVLITE.EXE; AVLTMAIN.EXE; AVTASK.EXE; LUPGCONF.EXE;
      PAVSRV51.EXE; PavPrSrv.exe


 File details Programming language:
 The malware program was written in Visual Basic.


Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Bogdan Iliuta on Wednesday, November 8, 2006
Description updated by Bogdan Iliuta on Wednesday, November 22, 2006

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