Information security audit: what it is, what types exist and how it works

What an information security audit is in plain words

An information security (infosec) audit is an independent check of how well your data, systems and processes are protected. Essentially it is an inspection for your IT infrastructure: specialists look at where an attacker could get in, what data would leak in case of a breach, whether your protection meets legal requirements — and deliver a report listing the problems and the priorities for fixing them.

Important: an audit does not “fix” — it finds and prioritizes. It is a map of vulnerabilities on which the defense is then built. Without such a map a company either spends money protecting against the wrong threats, or learns about the holes only after a leak.

Why a business needs an infosec audit

• Real risks. A customer database leak, business downtime from ransomware, a breach of online payments — all of it costs more than the check that would have prevented it.
• Legal requirements. If you work with personal data you must comply with 152-FZ. In several industries FSTEC, Central Bank and Roskomnadzor requirements are added. An audit shows where you don’t comply before an inspection with a fine does.
• Partner trust. Large customers and B2B clients increasingly require proof of security before starting work.
• After an incident. If a breach or failure already happened, an audit shows how it occurred and how to prevent a repeat.

Types of information security audit

“Infosec audit” covers several different kinds of work — it’s important not to confuse them:

By who performs it

• Internal — by your own staff. Cheap, but the eye is “blurred” and there is no independence.
• External — an independent team. Looks without bias, sees what has become invisible from the inside.

By objective

• Expert (comprehensive) audit — an assessment of the whole protection system: infrastructure, processes, access, staff. Answers “how protected are we in general”.
• Compliance audit — checking compliance with a specific standard or law (152-FZ, FSTEC requirements, ISO 27001). Answers “will we pass the inspection”.
• Penetration testing (pentest) — a practical simulation of an attack. Answers “can we actually be hacked, and how”.
• Web application and website audit — focused on online services, where attacks most often happen. A related topic — our web application security checklist.

An infosec audit and a pentest — what’s the difference

They are often confused, but they are different things. An audit is a broad inspection: we review documents, settings, processes, access, assessing the system as a whole. A pentest is a practical trial by combat: the team tries to actually break into the system using the same methods as an attacker, and confirms each vulnerability with a demonstration.

An analogy: an audit is an engineer inspecting a building against blueprints and codes; a pentest is a specially hired person trying to break into it. The maximum effect comes from the combination: a comprehensive audit finds weak spots across the whole system, and a pentest confirms the critical ones in practice.

How an audit works: the stages

1. Preparation and agreement. We define the scope (what we check), the goals, sign an NDA. We set the rules so the check doesn’t affect production services.
2. Information gathering. Inventory of systems, networks, access, data. What exists at all and what needs protecting.
3. Analysis. Checking configurations, access rights, updates, password policies, encryption, backups. Searching for vulnerabilities with automated scanners and by hand.
4. Practical check (if a pentest is included): attempts to exploit found vulnerabilities within the agreed scope.
5. Report and recommendations. A list of problems with a criticality rating and a prioritized remediation plan.

What you get in the end

The main result of an audit is a report, not just “everything is bad/good”. A good report contains:

• a list of found vulnerabilities with a risk level (critical / high / medium / low);
• for each — what it is, what it threatens and how to fix it;
• a prioritized plan: what to fix first (maximum risk at minimum cost);
• a compliance assessment (152-FZ etc.), if it was a compliance audit;
• an executive summary — no technical jargon, in the language of risk and money.

How often to do it

A one-off audit is a photograph of a specific moment. Infrastructure changes, new threats appear, so the baseline recommendation is once a year, plus after significant changes: launching a new service, a migration, a major update — and especially after any incident. Between audits, protection is maintained with monitoring and regular support.

How to choose a contractor

• Work under contract and NDA — data about your defenses must not leak to third parties.
• A clear report — not a “scanner dump”, but an analysis with priorities and recommendations.
• Practice, not just a “paper” audit — it matters that they find real holes, not only compare documents against a checklist.
• Help with remediation — it’s good when the contractor can not only find problems but also help close them.

Conclusion

An information security audit is an independent map of your vulnerabilities: where they can get in, what would leak and whether you comply with 152-FZ. The types differ (expert, compliance, pentest) — the choice depends on the goal: understand the overall level of protection, pass an inspection or test the system in combat. It’s best to start with a comprehensive audit and confirm the critical findings with a pentest. We’ll perform an information security audit and penetration testing under contract with a clear report — leave a request.