Establish and Maintain an Audit Log Management Process

Every security investigation starts with the same question: what actually happened? In a lot of organizations, the honest answer is some version of “we’re not entirely sure.” Not because the evidence never existed, but because no one decided in advance what to record, how long to keep it, or who was responsible for it. Control 8.1 is about making that decision on purpose, before the day you need the answer.

An audit log is simply a record of what happened on a system: who signed in, what an administrator changed, when a security tool raised an alarm. The logs themselves aren’t the hard part. Deciding what’s worth recording, and building a process that keeps those records useful over time, is where most organizations fall short. This safeguard is the plan, not the plumbing.

What this control actually says (in plain English)

Here’s the translation: write down what your systems should record, how long you’ll keep it, and who owns it, then revisit that plan on a regular schedule.

Now the official version. Control 8.1 says you should establish and maintain a documented audit log management process that defines your organization’s logging requirements, and review it at least annually or whenever something significant changes.

That word documented matters. The goal isn’t to log everything and hope. It’s to make a deliberate decision about what you need to be able to reconstruct later, and to hold yourself to it.

Why business leaders should care

Logs are the difference between “we think we contained it” and “we know we contained it.” When something goes wrong, the questions come quickly and they are not technical questions. Who had access? What did they touch? When did this start, and is it still happening? An organization that decided in advance what to record can answer those questions in hours. An organization that didn’t often spends weeks guessing, and frequently has to assume the worst simply because it can’t prove otherwise.

This is also where earlier controls in the series pay off. Logging only tells you who did something if identities are trustworthy in the first place, which is why shared and default accounts are such a problem. When I wrote about them in Manage Default Accounts on Enterprise Assets and Software, the core issue was attribution, and audit logging is where attribution either holds up or falls apart. The same is true for how systems are administered, the point behind Securely Managing Network Gear. A log that says “an admin made a change” is far less useful than one that says exactly which person did.

What “good” looks like

You don’t need an expensive platform to satisfy 8.1. You need a clear, written decision and an owner. Here’s the practical path.

• Decide what to record. At a minimum, capture authentication events (successful and failed sign-ins), administrative and privileged actions, and alerts from your security tools. Focus on the events you’d actually want during an investigation.
• Set a retention period. Decide how far back you would realistically need to look, and write that number down. This drives everything downstream, including storage.
• Name an owner. Assign one person or role responsible for the logging standard and for confirming it is actually being followed.
• Write it down and review it. Keep the process in your documentation platform with a last-reviewed date, and revisit it at least once a year or after any major change to your environment.

The audit and defensibility angle

This control is quietly one of the most important for standing behind your security posture. Auditors, regulators, and cyber-insurance underwriters increasingly expect to see a defined logging process, not just the existence of some logs somewhere. Being able to hand over a written standard that says what you capture, how long you keep it, and who maintains it turns a vague claim into demonstrable diligence. It also makes every future incident cheaper, faster, and less uncertain to work through.

Audit logging is easy to put off because nothing bad happens when you ignore it, right up until the moment you need it and it isn’t there. Establishing the process now is a small, unglamorous decision that pays for itself the first time you have to answer the question every investigation begins with. Decide what to remember before you need to remember it, and the record will be waiting when it matters.