Ransomware Network Traffic Analysis for Pre-Encryption Alert

International audienceCyber Security researchers are in an ongoing battle against ransomware attacks. Some exploits begin with social engineering methods to install payloads on victims' computers , followed by a communication with command and control servers for data exchange. To scale down these attacks, scientists should shed light on the danger of those rising intrusions to prevent permanent data loss. To join this arm race against malware, we propose in this paper an analysis of various ransomware families based on the collected system and network logs from a computer. We delve into malicious network traffic generated by these samples to perform a packet level detection. Our goal is to reconstruct ransomware's full activity to check if its network communication is distinguishable from benign traffic. Then, we examine if the first packet sent occurs before data's encryption to alert the administrators or afterwards. We aim to define the first occurrence of the alert raised by malicious network traffic and where it takes place in a ransomware workflow. Logs collected are available at http://serveur2.seres.rennes.telecom-bretagne.eu/data/RansomwareData/