3. Code Injection Techniques

As mentioned earlier, the objective of a code injection technique is to inject code into the remote process memory and execute the injected code within the context of a remote process. The injected code could be a module such as an executable, DLL, or even shellcode. Code injection techniques provide many benefits for attackers; once the code is injected into the remote process, an adversary can do the following things:

• Force the remote process to execute the injected code to perform malicious actions (such as downloading additional files or stealing keystrokes).
• Inject a malicious module (such as a DLL) and redirect the API call made by the remote process to a malicious function in the injected module. The malicious function can then intercept the input parameters of the API call, and also filter the output parameters. For example, Internet Explorer uses HttpSendRequest() to send a request containing an optional POST payload to the web server, and it uses InternetReadFile...