Threat Description

Exploit: ​JS/Agent.IHL


Category: Malware
Type: Exploit
Platform: JS
Aliases: Exploit:​JS/Agent.IHL


Exploit:JS/Agent.IHL is JavaScript, usually found on malicious or compromised websites.

It is used to silently install malicious software onto the website visitor's system.


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


Exploit:JS/Agent.IHL is JavaScript code that exploits a vulnerability found in versions of Microsoft Internet Explorer.

This exploit targets Internet Explorer 7 in and works on the Windows XP and Windows Server 2003 operating systems.

Note: It appears that this exploit may also work on Vista SP0 and SP1.

The exploit can be recognized as shown in the picture below:

If the exploit successfully executes, it will download a malicious file from the following URL address:


We detect the downloaded file as Trojan:W32/Agent.IHN.


Please see the following report for additional information on the vulnerability used:

Note: To be clear, scripts used by this particular exploit target IE7 while the vulnerability itself affects all versions of IE.

Network Connections

Attempts to connect with HTTP to:



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