Media attention has been given to several commercial IIS websites being remotely hacked recently. Exploit-MhtRedir.gen was used to redirect the user's web browser to the location
http://217.107.218.147 containing an infected web page that caused un solicited files to be downloaded and executed.
For further details about vulnerable IIS servers and IE clients, see
http://www.microsoft.com/security/in...load_ject.mspx
The exploit results in a CHM (Microsoft Compiled Help) file being written to the local system allowing for additional exploit code to then execute the downloaded file.
The end result is the execution of arbitrary code at the permission level of the current user.