VBS_GROUCH.A

It checks if it has already infected the Microsoft Word global template, Normal.dot by checking for the existence of a registry key.

Infected document files are detected by Trend Micro as WM_GROUCH.A.

It propagates via email by sending a copy of itself to addresses found in the Microsoft Outlook address book.

It then deletes each message as they are sent.

It keeps a list of all email address that it has sent in a certain registry key.

It deletes all files in the %Windows% folder if the current date is May 9 and displays a message box.

This worm arrives as attachment to mass-mailed email messages. It arrives via removable drives.

It gathers target email addresses from cached email, address books, and mailboxes.

Arrival Details

This worm arrives as attachment to mass-mailed email messages.

It arrives via removable drives.

It may arrive via network shares.

Installation

This worm drops the following files:

• %System%\WinGrc32.dll - detected as WM_GROUCH.A

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

It drops the following copies of itself into the affected system:

• %System%\MSGrc32.vbs
• %System%\SiteLinks.vbs
• %System%\Readme.vbs
• %System%\Mp3Sites.vbs
• %System%\{random characters}.vbs
• %Startup%\{random characters}.vbs

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
MSGrc32 = Wscript.exe %System%\MSGrc32.vbs %1

Other System Modifications

This worm adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Zed/[rRlf]\
Grouch\1.0
RndCopy = {file name of copy in %Startup% folder}

HKEY_CURRENT_USER\Software\Zed/[rRlf]\
Grouch\1.0\NormalTemplate
(Default) = {day of infection}

HKEY_CURRENT_USER\Software\Microsoft\
Office\{Application Version}\Word\
Security
Level = 1

HKEY_CURRENT_USER\Software\Zed/[rRlf]\
Grouch\1.0
(Default) = VBS/Grouch by Zed/[rRlf]

HKEY_CURRENT_USER\Software\Microsoft\
Office\{Application Version}\Word\
Security
AccessVBOM = 1

It adds the following registry keys as part of its installation routine:

HKEY_CURRENT_USER\Software\Zed/[rRlf]

HKEY_CURRENT_USER\Software\Zed/[rRlf]\
Grouch

HKEY_CURRENT_USER\Software\Zed/[rRlf]\
Grouch\1.0

HKEY_CURRENT_USER\Software\Zed/[rRlf]\
Grouch\1.0\NormalTemplate

HKEY_CURRENT_USER\Software\Zed/[rRlf]\
Grouch\1.0\Outlook

HKEY_CURRENT_USER\Software\Zed/[rRlf]\
Grouch\1.0\Outlook\
RecordContacts

Propagation

This worm drops copies of itself into the following folders used in peer-to-peer (P2P) networks:

• %Program files%\Kazaa\My Shared Folder
• C:\Kazaa\My Shared Folder
• C:\My Downloads
• %Program files%\KaZaA Lite\My Shared Folder
• %Program files%\Bearshare\Shared
• %Program files%\Edonkey2000
• %Program files%\Morpheus\My Shared Folder
• %Program files%\Grokster\My Grokster
• %Program files%\ICQ\Shared Files

It drops the following copy of itself in all physical and removable drives:

• [drive]:\Saved Document (day of execution}.vbs

It gathers target email addresses from cached email, address books, and mailboxes.

Other Details

This worm does the following:

• Microsoft Office Word Infection
  Checks if it has already infected the Microsoft Word global template,Normal.dot by checking for the existence of the following registry key:
  HKEY_CURRENT_USER\Software\Zed/[rRlf]\Grouch\1.0\NormalTemplate
  (Default) = {day of infection}
  Infected document files are detected by Trend Micro as WM_GROUCH.A.
• Uses the following file names for its copies in the said P2P folders:
  
  • 1000 Porn Sites.vbs
  • Hacking made easy.vbs
  • How to make a virus.vbs
  • Hot Links.vbs
  • How to make a bomb.vbs
• Email Propagation
  Propagates via email by sending a copy of itself to addresses found in the Microsoft Outlook address book. It sends email with the following details:
  
  Subject: Check this out
  Message body: Check out these web links, I know you like these sites! ;)
  Attachment: SiteLinks.vbs
  
  Subject: The File
  Message body: Hello, Here is that file that everyone was asking me for. Don't let anyone else see it, please, because it contains some pretty naughty stuff ;)
  Attachment: SiteLinks.vbs
  
  Subject: Readme File
  Message body: Hello, I am running a bit late. Just read the Readme file for more information.
  Attachment: Readme.vbs
  
  Note that on the system date, May 9, it sends email with the following specific format:
  
  Subject: Fwd: Free Music!
  Message body: Hello! Go to these sites that I'm sending to you now. You can get basically any music file or Music video file that you want! Enjoy!
  Attachment: Mp3Sites.vbs
  
  It then deletes each message as they are sent.
• Keeps a list of all email address that it has sent to in the following registry key:
  HKEY_CURRENT_USER\Software\Zed/[rRlf]\Grouch\
  1.0\Outlook\RecordContacts\
• Deletes all files in the %Windows% folder if the current date is May 9 and displays the following message box: