How to block a specific external command on Windows?

[ORLOVA]

Hello folks,

I would like to know, How to block a specific external command on Windows?

[Dam Ponting]

Internet Protocol security (IPSec) filtering rules can be used to help protect Windows 2000-based, Windows XP-based, and Windows Server 2003-based computers from network-based attacks from threats such as viruses and worms. This article describes how to filter a particular protocol and port combination for both inbound and outbound network traffic. It includes steps to whether there are any IPSec policies currently assigned to a Windows 2000-based, Windows XP-based, or Windows Server 2003-based computer, steps to create and assign a new IPSec policy, and steps to unassign and delete an IPSec policy.

[lishmalinyjames]

1) Make a backup copy of "useful.exe", (say named "useful-original.exe") before altering it.
2) Make sure you use the same number of characters as the length of the original "nasty" string you are replacing.