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T1055.005sub-technique of T1055 Process Injection

Thread Local Storage

Windowsnothing on this site yetT1055.005 on attack.mitre.org

Adversaries may inject malicious code into processes via thread local storage (TLS) callbacks in order to evade process-based defenses as well as possibly elevate privileges. TLS callback injection is a method of executing arbitrary code in the address space of a separate live process.

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

Detection Strategy for TLS Callback Injection via PE Memory Modification and Hollowing

  • Detects thread local storage (TLS) callback injection by monitoring memory modifications to PE headers and TLS directory structures during or after process hollowing events, followed by anomalous thread behavior prior to main entry point execution.

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.