Cybersecurity, learned like a practitioner.
24 learning paths · 398 modules live · every lesson written by someone who has shipped the control or run the engagement. Free to start.
Active Directory Security · modules
Red-team and blue-team AD. Kerberos, BloodHound, defensive hardening.
Module 22 · DCShadow — Stealth Domain Replication Abuse
Why this module exists. DCShadow is the textbook example of “stealth persistence”. An attacker with sufficient privileges does not need to keep dropping files, scheduling tasks, or modifying registry keys — they push the change into the directory itself via the replication protocol, and the change is now part of the canonical AD state. Defender […]
Module 19 · SID History Abuse & Cross-Forest Trust Attacks
Why this module exists. Forest trusts were Microsoft’s promise that the forest boundary was a hard security boundary. SID Filtering — enabled by default on external trusts since Windows Server 2003 — was the control that made the promise real. But every year, a new variation on SID-History abuse shows it is not as hard […]
Module 11 · Kerberos Delegation Abuse — Unconstrained, Constrained, RBCD
Why this module exists. Kerberos delegation is one of the most-misunderstood AD features and one of the most-abused. Three flavours, all dangerous when misconfigured: Unconstrained (legacy, terrifying), Constrained (better, still bad), and Resource-Based Constrained Delegation (the new one, with its own attack class). Every red team checks all three. Why delegation exists Tiered apps need […]
Module 7 · Hybrid AD & ADFS Attack Surface
Entra Connect crown jewel, ADFS Golden SAML, PHS attacks, on-prem ↔ cloud lateral movement, Tier 0 isolation.
Practitioners who've
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