Follow this guide on using tcpdump in command line if Wireshark is not an option. Follow this guide for analysis on laptops. Capture the traffic for at least 2 hours and ideally for 24 hours as malware beacons can be done once daily. Assist the beneficiary in creating and exporting a PCAP file capturing the traffic of the device that shows suspicious behavior. Host-based investigation ( Article #367: Live Forensics for Windows and Article #368: Live Forensics for Linux) has led to no result or it is not an option. 
ProblemĪ system is behaving strangely and you need to conduct a network perimeter analysis to check if it is compromised. Edit me PCAP File Analysis with Wireshark to investigate Malware infection How to analyze a PCAP file using Wireshark.
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