M365 Incident Response: Study Guide

How this course is designed to be used

This is a text-based course. Every section is written to be read, worked through, and referred back to during real engagements. There are no videos. You control the pace. You can re-read a section while running the queries alongside, jump back to a specific KQL example during a live investigation, or work through the guided walkthrough a second time with different evidence. The format is deliberate: text scales to your speed and works as a field reference after you've completed the course.

The course is sequential. Each phase assumes the knowledge from the one before it. The preparation modules (1 through 3) establish the capability and environment knowledge that the investigation modules (4 through 6) depend on. The playbooks in Module 7 apply the investigation and containment skills from Phases 1 and 2 to specific threat types. The simulations in Module 11 pull everything together. Working through the modules in order gives you the strongest foundation.

That said, individual sections are designed to function as standalone references after you've completed the course. Need the KQL query for identifying inbox rules created from an anomalous IP? It's in Module 5. Need the containment sequence for OAuth consent remediation? Module 6. Need the GDPR Article 33 notification timeline? Module 8. The course teaches the first time through and serves as a field reference afterward.

What prior knowledge helps

The course targets practitioners with approximately two years of experience in security operations, IT administration, or a related technical role.

What you should be comfortable with. Navigating the M365 admin center. Basic Entra ID concepts: users, groups, and how authentication works at a general level. Exposure to either Defender XDR or Sentinel: you've seen the alert queue, you've looked at an incident, you understand that KQL is the query language even if you haven't written complex queries.

What the course teaches from scratch. Incident response methodology. You don't need prior IR experience. Module 1 covers IR frameworks, and every subsequent module builds the IR skills progressively. KQL is introduced in Module 4 as an investigation tool, with every query explained: what it does, why you run it at that point in the investigation, and what the output means. If you've used SQL, Power Query, or any structured query language, KQL will feel familiar. If you haven't, the course teaches it in context. Forensic analysis of M365 evidence sources is taught from first principles in Module 5. You don't need to know what MailItemsAccessed is or how the Unified Audit Log works before starting.

Licensing and access. The course explains what each M365 license tier provides. If you're working in an E3 environment, you'll understand exactly which evidence sources are unavailable (MailItemsAccessed is the most significant gap) and what workarounds exist. You don't need E5 to learn from the course, but you should know what license your organization runs. The practical exercises work against any M365 tenant with audit logging enabled.

How the exercises work

Throughout the course, you'll encounter PowerShell commands, KQL queries, Graph API calls, and tool configurations. These are the actual commands and queries you run during an investigation, not simplified examples. Every code block is copy-paste-ready against a real M365 tenant.

Each command includes context before you run it (what you're looking for and why), the command or query itself, and interpretation after the output (what the results mean in the context of the investigation, what to look for, and what the next step is based on what you find).

The guided walkthroughs at the end of most modules are end-to-end practical exercises. You work through a complete investigation or response process from trigger to conclusion. These are not recaps. They're self-contained exercises where you apply everything the module taught in sequence, making decisions at each stage based on what the evidence shows you.

Study approaches by background

How you work through the course depends on what you already know.

SOC analysts moving into IR. You understand alert triage and the M365 security stack. Your gap is investigation depth, containment methodology, and the legal and communication dimensions of response. Modules 5 (forensics), 6 (containment), and 8 (legal/compliance) are your highest-value modules. Modules 1 through 4 will reinforce what you know and add the IR framing around it. Don't skip Module 3 (preparation). The logging and Conditional Access configuration it teaches directly determines what evidence and containment actions are available when you need them.

IT administrators building IR skills. You understand the M365 platform deeply but haven't done security investigation work. The entire course is relevant. Module 1 establishes the IR mindset. Module 3 maps directly to the configuration work you already do, but frames it through the lens of what an incident responder needs. Modules 4 and 5 teach you to read the audit logs your environment has been generating. Take your time with the KQL introduction in Module 4 and the evidence architecture in Module 5.

Security consultants building an M365 IR practice. You need the technical depth and the client-facing skills. Modules 4 through 7 give you the investigation and response capability. Module 8 gives you the legal, compliance, and communication framework that clients expect from an IR engagement. Module 11's capstone produces a deliverable you can adapt for client work.

Experienced IR practitioners adding cloud skills. You know IR methodology but your experience is endpoint-focused. The biggest adjustment is that cloud evidence is ephemeral, distributed across multiple log sources, and queryable through APIs rather than forensic tools. Module 1 reframes IR for cloud. Modules 5 and 6 are your core learning. You can move quickly through methodology sections and focus on the evidence sources, forensic techniques, and containment actions that are completely different from endpoint IR.

Pace and time commitment

The course is estimated at 36 to 40 hours of study time, including reading, running exercises, and completing guided walkthroughs. Module 5 (Forensics and Evidence Collection) is the largest. Modules like Module 8 (Legal and Compliance) and Module 10 (Post-Incident Improvement) are lighter. Plan for uneven pacing.

There is no time limit. Work at whatever pace suits your schedule.

Section 0.3 covers incident response in the cloud: how cloud environments change the IR discipline, and what cloud gives you that traditional environments don't.