The Internet threat alert status is currently normal. At present, no major epidemics or other serious incidents have been recorded by Kaspersky Lab’s monitoring service. Internet threat level: 1


Published Mar 06 2012 16:01 GMT

Technical Details
Removal instructions

Technical Details

This exploit program uses vulnerability in Microsoft Windows Help and Support Center to execute itself on the user's computer. It is an HTML page containing Java Script. It is 15 374 bytes in size.


Once the document is opened in the user's browser, the malware decrypts the obfuscated code and launches malicious scripts. Every 5 seconds the malware attempts to redirect the user to a resource, which, in relation to the malicious document, is located at the following link:

where X is the location of the original exploit file on the malicious user's server. It will then execute the malicious script in a hidden frame to exploit vulnerability in MS Windows Help and Support Center. The malicious program exploits a vulnerability that arises due to the incorrect handling of URL escape sequences in the function MPC::HexToNum in the Microsoft Windows Help and Support Center applications (helpctr.exe) (MS10-042, CVE-2010-1885). After exploiting the vulnerability, the malicious user can run commands sent to the special protocol "hcp://". The Microsoft products MS Internet Explorer 8 and Windows Media Player 9 are vulnerable. The malware uses the ActiveX object "MSXML.XMLHTTP" to download the file located at the following URL:
and saves it under the name:
%Documents and Settings%\%Current User%\update.exe
Using the command line, the malicious program launches the downloaded file and terminates the Microsoft Windows Help and Support Center process:
At the time of writing, these links were inactive.

Removal instructions

If your computer does not have antivirus protection and has been infected by this malicious program, follow the instructions below to delete it:

  1. Delete the original exploit file (its location will depend on how the program originally penetrated the infected computer).
  2. Delete the following file:
    %Documents and Settings%\%Current User%\update.exe
  3. Install these updates: http://www.microsoft.com/technet/security/Bulletin/MS10-042.mspx
  4. Empty the Temporary Internet Files directory, which contains infected files (see How to delete infected files from Temporary Internet Files folder?):
  5. Perform a full scan of the computer using Kaspersky Anti-Virus with up-to-date antivirus databases (download a trial version).

[MD5: 9498d09c1f23d10bae4cf89c6812b078]
[SHA1: b41528f2aa297dacdc1c7ee1321d8a2a9de932ed]

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Exploits are programs that contain data or executable code which take advantage of one or more vulnerabilities in software running on a local or remote computer for clearly malicious purposes.

Often, malicious users employ an exploit to penetrate a victim computer in order to subsequently install malicious code (for example, to infect all visitors to a compromised website with a malicious program). Additionally, exploits are commonly used by Net-Worms in order to hack a victim computer without any action being required from the user.

Nuker programs are notable among exploits; such programs send specially crafted requests to local or remote computers, causing the system to crash.

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