Threat Description

Virus: ​W32/Redlof


Category: Malware
Type: Virus
Platform: W32, VBS
Aliases: Virus:​W32/Redlof, VBS/Redlof.A@m, VBS/Redolf


A malicious program that secretly integrates itself into program or data files. It spreads by integrating itself into more files each time the host program is run.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.

Technical Details

Redlof (also detected as VBS/Redlof.A@m) is a polymorphic virus that embeds itself without any attachment to every e-mail sent from the infected system. It executes when an infected email message is viewed.Redlof executes directly from an infected message by using a security vulnerbility in Internet Exlorer known as Microsoft VM ActiveX Control Vulnerability. More information about the vulnerability and a fix is available from Microsoft:


When the virus executes, it infects a file "web\Folders.htt" at the Windows installation directory which causes that the virus activates when any directory is opened using the Active Desktop's web folder feature.The virus also infects files with extensions:

  • "htm"
  • "html"
  • "asp"
  • "php"
  • "jsp"
  • "htt"
  • "vbs"

Redlof drops the following infected files:

  • \Program Files\Common Files\Microsoft Shared\Stationery\blank.html
  • \Windows\System\Kernel32.dll
  • \Windows\web\kjwall.gif
  • \Windows\system32\desktop.ini

"blank.html" is used to replace the default stationaries for both Outlook and Outlook Express via registry causing that the every message sent from an infected system will carry the virus.The "Kernel32.dll" is also set to registry so that it will be executed on the system restart.


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