In some respects, it can be argued that, the less IT ‘stuff’ an organization has, the fewer resources are going to be needed to run it all. However, with PCI compliance there are still always 12 Requirements and 650 sub-requirements in the PCI DSS to cover, regardless of whether you are a trillion dollar multinational or a local theatre company.

The principles of good security remain the same for both ends of the scale – you can only identify security threats if you know what business-as-usual, regular running looks like.

Establishing this baseline understanding will take time – 8 to 24 weeks in fact, because you are going to need a sufficiently wide perspective of what ‘regular’ looks like – and so we strongly advocate a baby-steps approach to PCI for all organizations, but especially those with smaller IT teams.

There is a strong argument that doing the basics well first.

Then expanding the scope of security measures is much more likely to succeed and be effective than trying to do everything at once and in a hurry.

Even if this means PCI Compliance will take months to implement.

This is a better strategy than implementing an unsupportable and too-broad a range of measures.

Better to work at a pace that you can cope with than to go too fast and go into overload.

This is the five step program recommendation, although it actually has merit for any size of organization.

PCI Compliance in 10 Minutes per Day

1. Classify your ‘in scope of PCI’ estate

You first need to understand where cardholder data resides.

When we talk about cardholder data ‘residing’ this is deliberately different to the more usual term of cardholder data ‘storage’. Card data passing through a PC, even it is encrypt and immediately transfer elsewhere for processing or storage, has still been ‘stored’ on that PC. You also need to include devices that share the same network as card data storing devices.
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Now classify your device groups.

For the example of Center Theatre Group, they have six core servers that process bookings.

They also have around 25 PCs being use for Box Office functions.

There are then around 125 other PCs being use for Admin and general business tasks.

So we would define ‘PCI Server’, ‘Box Office PC’ and ‘General PC’ classes.

Firewall devices are also a key class, but other network devices can be group together and left to a later phase.

Remember – this isn’t cutting corners and sweeping dirt under the carpet. But a pragmatic approach to doing the most important basics well first, or in other words, taking the long view on PCI Compliance.

2. Make a Big Assumption

We now apply an assumption to these Device Groups – that is, that devices within each class are so similar in terms of their make-up and behavior, that monitoring one or two sample devices from any class will provide an accurate representation of all other devices in the same class.

We all know what can happen when you assume anything but this is assumption is a good one. This is all about taking baby steps to compliance and as we have declared up front that we have a strategy that is practical for our organization and available resources this works well.

The idea is that we get a good idea of what normal operation looks like, but in a controlled and manageable manner.

We won’t get flood with file integrity changes or overwhelme with event log data

But we will see a representative range of behavior patterns to understand what we are going to be dealing with.

Given the device groups outlined, I would target one or two servers.

Say a web server and a general application server.

One or two Box Office PCs and one or two general PCs.

3. Watch

You’ll begin to see file changes and events being generate by your monitor devices and about ten minutes later you’ll be wondering what they all are.

Some are self explanatory, some not so.

Sooner or later, the imperative of tight Change Control becomes apparent. If changes are being make at random.

how can you begin to associate change alerts from your FIM system with intended ‘good’ changes and consequently.

to detect genuinely unexpected changes which could be malicious?

Much easier if you can know in advance when changes are likely to happen – say.

schedule the third Thursday in any month for patching. If you then see changes detected on a Monday these are exceptional by default.

OK, there will always be a need for emergency fixes and changes but getting in control of the notification.

Documentation of Changes really starts to make sense when you begin to get serious about security.

Similarly from a log analysis standpoint.

Once you begin capturing logs in line with PCI DSS Requirement 10 you quickly see a load of activity that you never knew was happening before.

Is it normal, should you be worrie by events that don’t immediately make sense? There is no alternative but to get intimate with your logs and begin understanding what regular activity looks like.

Otherwise you will never be able to detect the irregular and potentially harmful.

4. PCI Implement

Now you are in control of what ‘regular operation’ looks like, you can begin expanding the scope of your File Integrity and Logging measures to cover all devices.Logically, although there will be a much higher volume of events being gathered from systems.

These will be within the bounds of ‘known, expected’ events.

Similarly, now that your Change Management processes has been mature.

File integrity changes and other configuration changes will only be detecte during schedule.

Planned maintenance periods.

Ideally your FIM system will be integrated with your Change Management process so that events can be category as Plan Changes and reconcile with RFC (Request for Change) details.

NNT is a leading provider of PCI DSS and general Security and Compliance solutions. As both a File Integrity Monitoring Software Manufacturer and Security Services Provider, we are firmly focused on helping organisations protect their sensitive data against security threats and network breaches in the most efficient and cost effective manner.

NNT solutions are straightforward to use and offer exceptional value for money.
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Making it easy and affordable for organisations of any size to achieve and retain compliance at all times. Each product has the guidelines of the PCI DSS at its core.

Which can then be tailore to suit any internal best practice or external compliance initiative.