Someone sent me a file with white and black rectangles. I don’t know how to read it. Can you help me?
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What we get is a packet capture file. I usually approach those with python, but this one was easier to do with just Wireshark.
But first, let’s run
strings on it for good measure, two things are interesting:
Authorization: Basic ZmxhZzphenVsY3JlbWE= ...snip... Content-Disposition: attachment; filename="flag.zip"
The authorization base64 translates to
Now we use Wireshark to extract all HTTP objects, we get two html files and
flag.zip. When trying to extract the zip, it asks for a password. What could it be? Hmmm. Let’s try
azulcrema… voila! We get a