Threat Description

Exploit:​JS/Agent.IHL

Details

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

Summary



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.



Removal



Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



Technical Details



Exploit

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:

  • http://www.steoo.com/[...]/win.exe

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

Vulnerability

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:

  • http://www.steoo.com/[...]/win.exe





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