Clear it in 3 steps
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Start the environment
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Investigate the target
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Submit the flag
Clear-text HTTP traffic from a shop's internal network was captured. Among many requests, exactly one is the administrator's login attempt. Analyze the packet capture (traffic.pcap) and extract the administrator (username=admin) password. The password is the flag.
Filter with http.request.method == "POST" to see only POSTs
There are several POSTs to /login; the one with username=admin is the target
tshark -r traffic.pcap -Y 'http.request.uri=="/login"' -T fields -e http.file_data