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A security analyst reviews a packet capture and identifies the following output as anomalous: 13:49:57.553161 TP10.203.10.17.45701>10.203.10.22.12930:Flags[FPU],seq108331482,win1024,urg0, length0 13:49:57.553162 IP10.203.10.17.45701>10.203.10.22.48968:Flags[FPU],seq108331482,win1024,urg0, length0 ... Which of the following activities explains the output?
Correct Answer: A
The captured traffic shows TCP packets with the Flags [FPU], which indicate that the FIN, PSH, and URG flags are set. This is characteristic of an Nmap Xmas scan. The Xmas scan is a type of port scan that sends packets with these flags set to determine port states based on responses from the target system. This technique is often used in stealth scanning to evade detection by firewalls or IDS/IPS. * Nikto's web scan (B) is used for identifying web server vulnerabilities but does not generate TCP packets with such unusual flags. * Socat's proxying (C) would not exhibit the specific Xmas scan pattern. * Angry IP Scanner (D) is a general-purpose scanner that does not use the TCP flags seen in this capture.