Cyber Self‑Defense Under Active Intrusion: A Lawful, Ethical, and Operational Framework for Defensive Deception, Containment, Attribution, and Recovery

Modern cyber intrusions no longer resemble isolated exploits or simple perimeter breaches. Adversaries increasingly operate with valid credentials, cloud‑level permissions, and administrative pathways that allow them to blend into legitimate activity. In this environment, defenders must act during the intrusion itself — not only before or after it. This paper introduces the Bounded Cyber Self‑Defense Model, a lawful and ethically grounded framework for responding to active intrusion inside systems the defender owns or is authorized to protect. The model synthesizes guidance from incident response doctrine, cyber‑resilience engineering, digital evidence practice, and defensive deception research. It reframes cyber self‑defense as a bounded window of authorized action, triggered by confirmed unauthorized activity and closed once the intruder is contained or exits. Within this window, defenders may harden, monitor, isolate, deceive, deny exfiltration, preserve evidence, coordinate with providers, and restore operations — but must not retaliate, hack back, or pursue attackers outside their authority. The paper contributes: a seven‑layer operational structure (govern, prevent, detect, contain, attribute, recover, improve) a legal and ethical perimeter principle defining the limits of authorized defensive action a taxonomy of defensive deception controls and governance guardrails an evidence‑centered attribution model suitable for legal and regulatory review recovery and resilience criteria that determine whether self‑defense actions are credible and auditable The framework is vendor‑neutral and tool‑neutral. It is designed for organizations seeking to modernize incident response, reduce adversary dwell time, improve evidence quality, and maintain lawful authority during high‑pressure intrusion events. It is also intended for researchers, policymakers, and practitioners evaluating the boundaries between active defense, cyber self‑defense, and prohibited counter‑intrusion. This work is part of the BlackLattice Research series on sovereign, attested, and compliance‑bounded cybersecurity and AI architectures.