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Discovered: April 18, 2002
Updated: February 13, 2007 11:39:56 AM
Also Known As: Exploit-Mime.gen [McAfee], Exploit/iFrame [Panda]
Type: Worm
Systems Affected: Windows
CVE References: CVE-2001-0154

IFrame.Exploit is a detection for threats that exploits a known Internet Explorer vulnerability. This vulnerability allows an individual to send you email that has an attachment containing malicious code; the author of the threat can enable the attachment to automatically run when you receive it.

Information and a patch for this exploit can be found at: http://www.microsoft.com/technet/security/bulletin/MS01-020.asp .

According to Microsoft:

  • This vulnerability affects Microsoft Internet Explorer 5.01 and Internet Explorer 5.5.
  • This vulnerability does not affect Internet Explorer 5.01 Service Pack 2.
  • This vulnerability does not affect Internet Explorer 6.0 if you run Windows NT 4.0, Windows 2000, or Windows XP.
  • If you ran Windows 95/98/Me and upgraded to Internet Explorer 6.0, select either the Full Install or Typical Install option when you install 6.0. If you choose Minimal Install or Custom Install, the files containing the vulnerability may not be upgraded.

Antivirus Protection Dates

  • Initial Rapid Release version April 19, 2002
  • Latest Rapid Release version July 26, 2019 revision 021
  • Initial Daily Certified version April 19, 2002
  • Latest Daily Certified version July 27, 2019 revision 002
  • Initial Weekly Certified release date April 24, 2002

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Technical Description

IFrame.Exploit is an exploit contained within a body of HTML and is typically used in email. The exploit allows malicious code to be executed by reading or previewing files containing this code. This exploit deceives the HTML viewer into executing viral code that the viewer thinks is an Audio or a Video component of the body of HTML.

Information and a patch for this exploit can be found at: http://www.microsoft.com/technet/security/bulletin/MS01-020.asp .


Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.


Download and install the patch from: http://www.microsoft.com/technet/security/bulletin/MS01-020.asp .

Writeup By: Douglas Knowles