Threat Hunting: When You Can’t Sit Back and Wait
Do you ever sit at your desk and wonder when the next attack on your network will occur? Maybe you have an automated system that sends you alerts, but you get so many false positives, you feel like you’re starting to drown in the irrelevant data. Meanwhile, threat actors are continuously improving their techniques and approaches.
While threat detection tools and incident response are both critical, sometimes security professionals need to take a more proactive approach. Threat hunting is essentially threat detection that is driven by a human analyst. This is somewhat different than it being driven by an automated system, no matter how powerful the system is.
“Security Operations Centers (SOCs) today are faced with an onslaught of false positive alerts and actual attacks often lay undetected for months before being discovered. Threat hunting is a critical new function for any modern SOC to proactively look in the blind spots of current tools and sensors and surface hidden, advanced threats,” says Ely Kahn, co-founder of Sqrrl and former Director of Cybersecurity at the White House.
Tools Are An Important Part Of The Strategy
Traditional systems for finding threats are typically based upon signatures, which means they can only detect things that are known. Newer systems actually monitor behavior and do a better job of identifying unknown attacks on your endpoints. Monitoring behaviors allows you to identify when an endpoint has been compromised. Machine learning can be used to identify traffic patterns of a hacked device as it reports back to a command-and-control system.
You can’t rely on monitoring and the alerts alone to know that your network is safe. Threat hunting helps you identify attackers that have been operating unseen within your network. At the same time, threat hunting can be used to augment your automated threat detection and improve the quality of detections by reducing false positives.
Without having someone actively hunting for threats on your network, you must wait for automated systems to alert you when an attack occurs. However, what happens when an attacker finds a way around your automated system and through gaps in your security?
Instead of sitting around waiting, threat hunters are constantly looking for new ways to identify attackers. A threat hunter can work to not only identify these threats, but to automate known threat detection in the future. This will help reduce the number of items that threat hunters will need to monitor going forward.
“While machine learning is incredibly powerful it’s not something that solves the attack detection problem. It’s something which narrows your focus and attracts the attention of a human analyst to take a look,” says Ian Barker with betanews.
Tips To Improve Your Threat Hunting
Make the most of your data: Automated systems can collect a plethora of data within a short period of time. Embracing data analytics can help you create datasets that will make your hunting more productive. Since some attacks involve weeks or even months of data, you will need a system like Apache Hadoop that can be used to collect and analyze the data.
Machine learning: With machine learning, you have the ability to increase your hunting potential and help you find the anomalies within your dataset.
Have a strategy in place (before you get hacked): An underlying theme in most of the sessions at April’s InfoSec World was to have a strategy in place before you get hacked. The last thing you want to do is to stand in front of the Board of Directors and tell them that the company has suffered a data breach. Create a strategy before this occurs. Use a framework like kill chain mapping to give you a way of making sure that each hunting expedition is efficient.
Let The Hunt Begin
Security researchers need to continue to challenge themselves in their organization to proactively hunt threats instead of waiting to react after a breach has occurred. Using a blended approach with threat hunting delivers better results than just depending on a single method or tool.