This step can be skipped if a suitable DLL name is already available in the target process. Allocate some memory in the target process, and the name of the DLL to be injected is written to it.This can be done by spawning the process or by keying off something created by that process that is known to exist – for instance, a window with a predictable title, or by obtaining a list of running processes and scanning for the target executable's filename. Process manipulation functions such as CreateRemoteThread or code injection techniques such as AtomBombing, can be used to inject a DLL into a program after it has started.
DLL must be signed by a valid certificate. That is the right way to use legal DLL injection on current version of Windows - Windows 10. DLLs listed under the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\AppCertDLLs are loaded into every process that calls the Win32 API functions CreateProcess, CreateProcessAsUser, CreateProcessWithLogonW, CreateProcessWithTokenW and WinExec.Starting with Windows 8, the entire AppInit_DLL functionality is disabled when Secure Boot is enabled, regardless of code signing or registry settings. Beginning with Windows 7, the AppInit_DLL infrastructure supports code signing. Beginning with Windows Vista, AppInit_DLLs are disabled by default. DLLs listed in the registry entry HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows\AppInit_DLLs are loaded into every process that loads User32.dll during the initial call of that DLL.There are multiple ways on Microsoft Windows to force a process to load and execute code in a DLL that the authors did not intend: A program used to inject arbitrary code into arbitrary processes is called a DLL injector. For example, the injected code could hook system function calls, or read the contents of password textboxes, which cannot be done the usual way.
DLL injection is often used by external programs to influence the behavior of another program in a way its authors did not anticipate or intend.
In computer programming, DLL injection is a technique used for running code within the address space of another process by forcing it to load a dynamic-link library.
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