This type of file will contain a network packet capture. You could use a command-line tool such as tcpdump to display the contents but a graphical tool such as Wireshark will make analysis easier.
Packet Capture refers to the action of capturing Internet Protocol (IP) packets for review or analysis. The term can also be used to describe the files that packet capture tools output, which are often saved in the .pcap format. Capturing packets is a common troubleshooting technique for network administrators, and is also used to examine network traffic for security threats.
Following a data breach or other incident, packet captures provide vital forensic clues that aid investigations. From a threat actor’s perspective, packet captures might be used to steal passwords and other sensitive data. Unlike active reconnaissance techniques like port scanning, capturing packets can be accomplished without leaving any trace behind for investigators.
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