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T1055.004sub-technique of T1055 Process Injection

Asynchronous Procedure Call

Windowsnothing on this site yetT1055.004 on attack.mitre.org

Adversaries may inject malicious code into processes via the asynchronous procedure call (APC) queue in order to evade process-based defenses as well as possibly elevate privileges. APC injection is a method of executing arbitrary code in the address space of a separate live process. APC injection is commonly performed by attaching malicious code to the APC Queue of a process's thread.

MITRE ATT&CK 19.2, retrieved 2026-09-12

If this is happening now

1

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 Asynchronous Procedure Call (APC) Injection via Remote Thread Queuing

  • Detects malicious injection behavior involving memory allocation, remote thread queuing via APC (e.g., QueueUserAPC), and altered thread context within another live process to execute unauthorized code under legitimate context.

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

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.