Threat Description

SillyDownloader

Details

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

Summary


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.



Removal


Automatic action

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

More

Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.

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



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: https://support.microsoft.com/?kbid=870669





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


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