![]() ![]() Let’s look at the hosts with the most outbound network traffic. They try to transfer as much data as they can, without setting a limit to their data transfer. Here we might assume that the attacker is not trying to hide. One host is sending out much more data from the enterprise than the others. A machine inside is being used to send out all of our widget designs. Our intellectual property is leaving the building in large chunks. *There are exceptions of course, such as exfiltrating the data physically Blatant Exfiltration If you want to read up more on this you can look through the ATT&CK matrix Data Exfiltrationĭata exfiltration is a fancy way of saying data theft_._ At one point, the data has to flow from within your network to the hands of the attacker*. Of course, this is a simplified version of a more complex chain of events. “Prevention is ideal, but detection is a must” - Dr. If we are able to detect and stop the attacker at any of these stages, then we can consider that as a win! To move laterally, the attacker needs to coordinate with their foothold ( Command and Control).To exfiltrate data, the attacker needs to reach the data ( lateral movement). ![]() To get the data, the attacker needs to exfiltrate the data.*Except for attacks such as ransomware attacks How do attackers get from an initial foothold to your data? Exploitation is only the first step of the attack, and the end goal is typically* data theft. Modern approaches to cybersecurity do not stop in just trying to prevent exploitation. What are we trying to find?Īll of the questions in this challenge are related to post-exploitation activities, which makes up the latter half of the cyber kill chain. So deep knowledge of network protocols is not needed for these challenges. This challenge provides some sample aggregated data on flows, and uses answers from the anomalous events to construct the flag.ĭata here is synthetic and does not model typical network protocols and behaviour. You often use network flow data to uncover anomalous security events. You are a network security administrator for the medium sized business XYZcorp. All implementation of the solutions can be found this kernel. I’d recommend you try out the challenges first here. This is both a walkthrough of the solution of Wildcard 400 challenge in the recent 2019 Trend Micro CTF, and some notes on network security monitoring. ![]()
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