Security Incident - step by step through the phases of a security incident

Dealing with a security incident is a long process that goes far beyond the acute crisis phase. The first 24 hours after the discovery of an attack are often characterised by hectic and uncertainty. In this initial phase, it is important to proceed in a structured manner, even if the situation appears chaotic. Companies must initially remain calm in order to avoid rash panic reactions. It is important to analyse the incident and take immediate measures, such as isolating the affected systems to prevent the attack from spreading further.

It is important that the systems are not shut down immediately in order to secure forensic evidence. At this point, external experts should also be called in to professionally investigate the incident. At the same time, crisis communication begins - who needs to be informed and what messages need to be communicated to stakeholders such as customers, employees and partners? The first 24 hours lay the foundation for all further steps and are of enormous importance.

Seven days later...

After seven days, the aim is to understand the severity of the incident and to take further action on a more sound basis. At this stage, forensic investigations should be completed in order to fully understand the course of the attack and know exactly which systems and data have been affected. Legal obligations must now also be taken into account. Data protection authorities, insurance companies and possibly law enforcement agencies must be informed in order to avoid legal consequences.

Communication with stakeholders is further intensified, especially with customers and partners. It is crucial to communicate clearly and transparently what exactly happened and what steps have already been taken to minimise the damage. In the week following the incident, it becomes clear to the company how extensive the damage actually is and how lengthy the recovery process can be. A crisis team must therefore also ensure that all measures are coordinated and prioritised in order to regain full control of the situation as quickly as possible.

One month on...

After one month, the company should already be able to report initial progress. While the acute security measures have been completed and the most important systems have been restored, the focus is now on the long-term stabilisation of the IT infrastructure. In this phase, the security strategy needs to be optimised in order to not only address the acute effects of the attack, but also to establish long-term preventative measures. New security measures such as firewalls, access controls and additional monitoring mechanisms should be implemented.

At this stage, companies should also begin to evaluate the lessons learnt from the incident. What worked, what didn't? This reflection helps to improve future security strategies and close gaps. Communication with stakeholders is also still very important. Transparency about the status of the recovery and the next steps will help to maintain the trust of customers and business partners.

One year on...

One year after the incident, the company is in an ideal position to establish a sustainable culture of security. At this point, there should no longer be any operational restrictions and the IT systems should be stable and secure again. However, even a year later, it is important not to simply tick off the incident, but to continue to utilise the knowledge gained. Looking back on the incident, the entire security strategy can be evaluated and optimised. Regular audits and vulnerability analyses are crucial to ensure that no new points of attack arise.

Employees' awareness of IT security must also be raised further. Sensitisation measures and training should not only be carried out in the event of an acute crisis, but must be carried out regularly in order to strengthen the security culture in the long term. In this phase, IT security should also be firmly integrated into the corporate strategy so that it is no longer treated as an isolated issue, but as an integral part of the entire company.

Conclusion

The period following a security incident shows how important it is to deal with IT security in a well thought-out and continuous manner. Such an incident is not a reason to be ashamed, but a wake-up call to rethink and improve your own security measures. Companies that deal openly with their experiences and learn from them can not only regain the trust of their customers, but also sensitise the entire industry. Dealing with a security incident in a professional and sustainable manner strengthens the company in the long term and helps to make the digital world a safer place.

Were you affected by a cyberattack yourself and would like to share your experiences? Then get in touch with us and become a guest on one of our episodes. Together, we can create more awareness for IT security!

In our podcast series "Security Incident", Michael and Jona talk in detail about the different phases of a security incident - from the initial response to long-term optimisation.