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
An unauthenticated DNS zone transfer (AXFR) against a misconfigured authoritative server was captured. Download the packet capture (traffic.pcap), analyze the TXT records in the transferred internal zone, and recover the flag.
AXFR runs over TCP/53; dns.qry.type == 252 is the zone-transfer request
Enumerate the TXT records in the response; SPF/DMARC/google-site-verification are decoys
The value of the _admin-note.corp.internal TXT record is the flag