Threat Description



Category: Malware
Type: Trojan
Platform: JS, VBS
Aliases: SillyDownloader, JS/SillyDownloader, VBS/SillyDownloader


SillyDownloader is a family of simple script trojan downloaders written with JavaScript or Visual Basic Script languages. These downloader use various vulnerabilities in Internet Explorer to download and execute other malware.


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

This family of downloaders use XMLHTTP control to download and ADODB.Stream control to write malware on the vulnearble machine, often combined with some other vulnerabilty that allows the downloader to escape from the Internet Explorer internet zone.

Typically SillyDownloader replaces the Windows Media Player in order to make sure that the downloaded component gets executed.

The downloaded component usually contains an another trojan or a backdoor.

Further information about ADODB control is available from Microsoft at:

Description Details: Sami Rautiainen, July 13th, 2005;


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