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Trojan:W32/BotVoice.A

Classification

Category:Malware
Type:Trojan
Platform:W32
Aliases:

Trojan:W32/BotVoice.ATrojan:W32/BotVoice.A

Summary

This Trojan removes program associations for several file types preventing these files from opening. It also makes use of the Microsoft Text-To-Speech (TTS) technology to play a text message as its payload.

Removal

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.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

Execution and Installation

Upon execution, this destructive Trojan drops the following file:

  • C:\Documents and Settings\[User Profile]\Application Data\Microsoft\Speech\Files\UserLexicons\SP_[random].dat

This non-malicious file is used as part of the Trojan's payload.It then modifies the following registry keys:

  • HKEY_CLASSES_ROOT\JSFile\Shell\Open\Command
  • HKEY_CLASSES_ROOT\VBSFile\Shell\Open\Command
  • HKEY_CLASSES_ROOT\batfile\shell\open\command
  • HKEY_CLASSES_ROOT\comfile\shell\open\command
  • HKEY_CLASSES_ROOT\exefile\shell\open\command
  • HKEY_CLASSES_ROOT\htmfile\shell\open\command
  • HKEY_CLASSES_ROOT\htmlfile\shell\open\command
  • HKEY_CLASSES_ROOT\jpgfile\shell\open\command
  • HKEY_CLASSES_ROOT\mp3file\shell\open\command
  • HKEY_CLASSES_ROOT\piffile\shell\open\command

By replacing the default values with the following string:

  • ":: Win32\Hira.A - eCORE[GEDZAC] - I AlwAyS WilL LoVE YoU BeA ::"

Note: These registry keys may be added if they currently do not exist in the system.The above modifications disable program associations for the following file types preventing the proper execution of such files:

  • BAT
  • COM
  • EXE
  • HTM
  • HTML
  • JPG
  • JS
  • MP3
  • PIF
  • VBS

It also modifies the default value of following registry key:

  • HKEY_CLASSES_ROOT\service\CLSID[Default] = ":: Win32\Hira.A - eCORE[GEDZAC] - I AlwAyS WilL LoVE YoU BeA ::"

The Trojan sets the following registry entries to disable Task Manager and Registry Editor:

  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System"DisableRegistryTools" = "1"
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System"DisableTaskMgr" = "1"

By default these values are not present, in which case they are added by the Trojan.The Trojan then terminates the following processes:

  • explorer.exe
  • msnmsgr.exe

File Deletion

The Trojan then attempts to delete all the files in the following directory:

  • [System Root Directory]\
  • [Windows Directory]\ServicePackFiles\i386\
  • [Windows Directory]\$NtServicePackUninstall$\

As well as all the files under the following user directories:

  • My Video
  • My Pictures
  • My Music
  • My Documents
  • Desktop

The location of these folders are derived under the following registry key:

  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders

If a restricted or protected file is encountered, the deletion routine stops for that specific directory.

Payload

The Trojan uses the Microsoft Text-To-Speech (TTS) technology to play the following text:

  • You has been infected I repeat You has been infected and your system files has been deletes. Sorry Have a Nice Day and bye bye

The Trojan also displays a message box if it is being debugged:

  • Title: Bea TkMmMmMmM
  • Message: I ProMise ... I Will Love YoU AlWayS BEa!

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