By: Tom Skoog, Cybersecurity & Data Management Practice Leader
This is our fourth article in a five-part series on the importance of incident response planning as part of your cybersecurity program. The purpose of an Incident Response Plan is to proactively plan the actions you will take if you are faced with a serious cybersecurity event, while you are not responding to a stressful situation.
The first article discussed the preparation phase of the plan and last month we explored containment and eradication. As stated previously, The National Institute of Standards and Technology (NIST) has developed a framework that all incident response plans should consider, including:
Ransomware Incident Response Plan – Recovery
Today we are focusing on the next phase of the response plan which is Recovery. This is when you restore the affected systems and return to normal day-to-day operations after an incident such as a ransomware infection/attack.
Often, this involves restoring not only the operating system but the business applications and associated data for that device (workstation/server). This is dependent on whether the gaps in the systems have been patched and how your organization will ensure these systems are not breached again.
Importance of Backups
The strength of your backups is a critical element to the effectiveness of the recovery phase. Often, organizations realize their backups have been infected as well as their primary system. This results in essentially reloading the ransomware or malware and starting all over in your recovery.
3-2-1 Backup Strategy
Organizations should be implementing the 3-2-1 backup strategy which means having three copies of each backup (one primary and two copies). Copies should be stored on two (2) different types of media (e.g., backup device, disk, removable hard drive, cloud, etc.). Finally, one copy should be maintained off-site and be immutable (cannot be changed) and segregated from the production network (either logically or physically – often referred to as “air-gapped”).
To ensure the ability to restore your backups, you should be restoring backups at least semi-annually (but ideally more frequently), to ensure your systems and data can in fact, be restored.
The next article will discuss the fifth and final phase of an incident response plan, Post Incident Activity: Lessons Learned.
If you would like to discuss incident response planning in more detail, reach out to Tom Skoog, Cybersecurity and Data Management Practice Leader at email@example.com.