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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

DialogArg

Threat LevelHigh threatDamageSevereDistributionNot widespread
Common name:DialogArg
Technical name:Exploit/DialogArg
Threat level:Medium
Alias:JS/Scob.A, VBS/Psyme, Exploit-MhtRedir, JS/Exploit-DialogArg.b trojan, Trojan.JS.Scob.a, Download.Ject, JS.Toofer, Win32.Toofer
Type:Hacking Tool
Effects:  

It represents a set of Trojans that contain a malicious JavaScript code, with instructions for downloading an executable file from an specific IP address.

Affected platforms:

Windows XP/2000/NT

First detected on:June 24, 2004
Detection updated on:June 24, 2004
StatisticsNo

Brief Description 

    

DialogArg represents a set of Trojans that contain a malicious JavaScript code, with instructions for downloading an executable file from an specific IP address.

This code is added to HTML, CSS or GIF files, among others, downloaded from a website hosted by an IIS (Internet Information Services) v5.0 server that is not properly updated with the corresponding security patches. However, for image files, as those with a GIF extension, the malicious code added will not be executable.

When customers of the browser Internet Explorer visit a website hosted by an affected server, they will receive the requested site with a footnote, which contains the malicious code. If Internet Explorer is not properly updated, the malicious code will be executed without users noticing.

The Trojans containing the JavaScript code download the backdoor Webber.P to the computer when users visit a modified website. This backdoor is downloaded from a server located in Russia.

It is very important to highlight that the modified websites appear to be clean in the web server: it is when the request is made that the server sends the webpage with the malicious code inserted as a footnote.

If you are an IIS v5.0 server administrator, it is highly recommendable that you download the security patch available at Microsoft webpage. Click here to download the patch.

In addition, if you are an Internet Explorer customer, apply the corresponding cumulative security patch. Click here to download the patch.

Visible Symptoms 

    

If your web server uses IIS (Internet Informacion Services) v5.0, check if the configuration settings have been modified so that all the websites hosted include a footnote.