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Attack: Process 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.

MITRE

Tactic

technique

Test : Remote Process Injection with Go using CreateRemoteThread WinAPI

OS

Description:

Leverages the Windows CreateRemoteThread function from Kernel32.dll to execute shellocde in a remote process.

This application leverages functions from the golang.org/x/sys/windows package, where feasible, like the windows.OpenProcess().

Steps taken with this technique

  1. Get a handle to the target process
  2. Allocate memory for the shellcode with VirtualAllocEx setting the page permissions to Read/Write
  3. Use the WriteProcessMemory to copy the shellcode to the allocated memory space in the remote process
  4. Change the memory page permissions to Execute/Read with VirtualProtectEx
  5. Execute the entrypoint of the shellcode in the remote process with CreateRemoteThread
  6. Close the handle to the remote process

Executor

powershell

Sigma Rule

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