|T1055.001||Dynamic-link Library Injection|
|T1055.002||Portable Executable Injection|
|T1055.003||Thread Execution Hijacking|
|T1055.004||Asynchronous Procedure Call|
|T1055.005||Thread Local Storage|
|T1055.008||Ptrace System Calls|
|T1055.011||Extra Window Memory Injection|
Adversaries may inject code into processes in order to evade process-based defenses as well as possibly elevate privileges. Process injection is a method of executing arbitrary code in the address space of a separate live process. Running code in the context of another process may allow access to the process's memory, system/network resources, and possibly elevated privileges. Execution via process injection may also evade detection from security products since the execution is masked under a legitimate process.
There are many different ways to inject code into a process, many of which abuse legitimate functionalities. These implementations exist for every major OS but are typically platform specific.
More sophisticated samples may perform multiple process injections to segment modules and further evade detection, utilizing named pipes or other inter-process communication (IPC) mechanisms as a communication channel.
|M1040||Behavior Prevention on Endpoint||
Some endpoint security solutions can be configured to block some types of process injection based on common sequences of behavior that occur during the injection process. For example, on Windows 10, Attack Surface Reduction (ASR) rules may prevent Office applications from code injection. 
|M1026||Privileged Account Management||
Utilize Yama (ex: /proc/sys/kernel/yama/ptrace_scope) to mitigate ptrace based process injection by restricting the use of ptrace to privileged users only. Other mitigation controls involve the deployment of security kernel modules that provide advanced access control and process restrictions such as SELinux, grsecurity, and AppArmor.
|ID||Data Source||Data Component||Detects|
Monitor for contextual data about a file, which may include information such as name, the content (ex: signature, headers, or data/media), user/ower, permissions, etc.
Monitor for changes made to files that may inject code into processes in order to evade process-based defenses as well as possibly elevate privileges.
Monitor DLL/PE file events, specifically creation of these binary files as well as the loading of DLLs into processes. Look for DLLs that are not recognized or not normally loaded into a process.
|DS0009||Process||OS API Execution||
Monitoring Windows API calls indicative of the various types of code injection may generate a significant amount of data and may not be directly useful for defense unless collected under specific circumstances for known bad sequences of calls, since benign use of API functions may be common and difficult to distinguish from malicious behavior. Windows API calls such as
Monitor for processes being viewed that may inject code into processes in order to evade process-based defenses as well as possibly elevate privileges.
Monitor for process memory inconsistencies, such as checking memory ranges against a known copy of the legitimate module.
Monitor for changes made to processes that may inject code into processes in order to evade process-based defenses as well as possibly elevate privileges.