T1055.001sub-technique of T1055 Process Injection

Dynamic-link Library Injection

Windowsnothing on this site yetT1055.001 on attack.mitre.org

Adversaries may inject dynamic-link libraries (DLLs) into processes in order to evade process-based defenses as well as possibly elevate privileges. DLL injection is a method of executing arbitrary code in the address space of a separate live process. DLL injection is commonly performed by writing the path to a DLL in the virtual address space of the target process before loading the DLL by invoking a new thread.
MITRE ATT&CK 19.2, retrieved 2026-09-12

If this is happening now

Checklists and playbooks to open while the alert is still live.

Playbook for this stage

Cloud account compromise

Impossible travel, an unrecognised inbox rule, or a reported invoice-fraud attempt.

how MITRE says to see it

Behavioral Detection of DLL Injection via Windows API

Detects DLL injection through correlation of memory allocation and writing to remote process memory (e.g., VirtualAllocEx, WriteProcessMemory), followed by remote thread creation (e.g., CreateRemoteThread) that loads a suspicious or unsigned DLL using LoadLibrary or reflective loading.

what reduces it

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.

the rest of T1055

T1055.002 Portable Executable Injection · not covered yet
T1055.003 Thread Execution Hijacking · not covered yet
T1055.004 Asynchronous Procedure Call · not covered yet
T1055.005 Thread Local Storage · not covered yet
T1055.008 Ptrace System Calls · not covered yet
T1055.009 Proc Memory · not covered yet
T1055.011 Extra Window Memory Injection · not covered yet
T1055.012 Process Hollowing · not covered yet
T1055.013 Process Doppelgänging · not covered yet
T1055.014 VDSO Hijacking · not covered yet
T1055.015 ListPlanting · not covered yet

The description, detection analytics and mitigations are reproduced from MITRE ATT&CK, version 19.2, under its terms of use. The checklists, hunts, labs and everything else linked here are this site’s.