VB.AS

Classification

Malware

Trojan

W32

Email-Worm.Win32.VB.as, Worm.Gasop.B, W32.Berlity@mm, Email-Worm:W32/VB.as, Worm/VB.AS.11, W32/Gasop@MM

Summary

VB.AS, a variant of VB, is a Trojan. VB.AS collects email addresses and is used by spammers to send emails from infected computers. VB.AS modifies registry keys and shows fake error messages.

Removal

Automatic action

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

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Technical Details

Upon execution, VB.AS, detected as Email-Worm.Win32.VB.as, displays a fake message: "File Error: [number]".

It then creates copies of itself in the following folders as:

  • %Temp% - (usually C:\Documents and Settings\[user]\Local Settings\Temp\ )
    • Horror.vbe
    • LSASS.exe
    • Service.exe
    • SVCHOST.exe
    • Winword.exe
  • %SystemDrive% - (usually C:\ )
    • COMAND.com
    • Spiderman.exe

It also creates the following registry entries to automatically launch when Windows starts:

  • [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run] AVPScaner "C:\Documents and Settings\[user]\Local Settings\Temp\"
  • [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] HostNet Service "C:\Documents and Settings\[user]\Local Settings\Temp\"

Additional registry entry:

  • [HKEY_CURRENT_USER\Software\Microsoft\Symantecs\Ver] Ver " 50"

It also searches for possible email addresses from all htm files found on the harddrive. All gathered data will be saved in the registry as follows:

  • [HKEY_CURRENT_USER\SOFTWARE\Microsoft\Records\FileList] List of htm files scanned for email addresses
  • [HKEY_CURRENT_USER\SOFTWARE\Microsoft\Records\AdressList] List of email addresses gathered
  • [HKEY_CURRENT_USER\SOFTWARE\Microsoft\Records\Names] List of gathered names from the email addresses (ex. 'myname@' from myname@domain.com)
  • [HKEY_CURRENT_USER\SOFTWARE\Microsoft\Records\Servers] List of gathered domain name the email addresses (ex. 'domain.com from myname@domain.com)
  • [HKEY_CURRENT_USER\SOFTWARE\Microsoft\Records\AdressAlList] List of all possible combination of email addresses based from the gathered names and domains
  • [HKEY_CURRENT_USER\SOFTWARE\Microsoft\Records\Activar] Indicates that the malware is active
  • [HKEY_CURRENT_USER\SOFTWARE\Microsoft\Records\Scaneado] Indicates that the malware has performed scan

Notes:

  • %Temp% - usually C:\Documents and Settings\[user]\Local Settings\Temp\
  • %SystemDrive% - usually C:\
  • [user] - is the current user

Date Created: 2006-10-04 08:15:33.0

Date Last Modified: 2006-10-04 16:06:56.0