Read The Rules

Follow link provided. Inspected the page source code and perform a search for flag{ to find the flag:

flag{bf61aced6e7f9335385a70f33b20d188}

Technical Support

Comes with hint that flag may be in discord channel - #ctf-open-ticket

With the hint, head over to the discord channel #ctf-open-ticket and grab the flag:

flag{68cc5f95b59112d7d6b041cd16f9f19d}

Spam Test

As suggested, a quick Google for the term Generic Test for Unsolicited Bulk Email returns a Wiki that contains a table of hashes for the string, thus giving the flag:

flag{6a684e1cdca03e6a436d182dd4069183}

Cover All Your Bases

CyberChef is your friend for the majority of the flags in this one, which seen an increment to the Base n for each decoding.

Encoding	Flag
Binary	flag{678ac45487c9862a6c2c00a1affed9dc}
Octal	flag{fe580e05e527f20421290605809caec9}
Base10	flag{7d1eb2e0776cd7c5c78df01010f30e50}
	(Charcode Base 10 in CyberChef)
HEX	flag{d3cb2be3e4e4a8f517d9c5ce4372b0b7}
Base32	flag{9bb5bb8ea508bcffbc51bd5e11efb29cc}
Base45	flag{b5bef376027104b8c73dafbe95be47f4}
Base64	flag{cd0164ff64726f2972b2d8f2ac0119db}
Base85	flag{a414ae096381d9594c58e785b3c95dfb}
Base92	flag{0c97042d855d7b353dc87c91ea902129}
	(Remove whitespace first in CyberChef)
Base65536	flag{4571745dcd4d16f8d6f0a7fdaf71528c}
	(Decode with this link)

Just a Little Bit

Another for the Chef that is Cyber… Popped the data into CyberChef, reducing the byte length of “From Binary” to 7 to reveal the flag:

flag{2c33c169aebdf2ee31e3895d5966d93f}

QRception

Plenty of online QR Code decoders, the output was all messed up but looked like another QR code in ASCII format. This site gave the best output format. I took a screenshot of the output, chucked it in CyberChef to render the image and Parse QR Code for the flag:

flag{e1487f138f885bfef64f07cdeac96908}

RFC 9309 (AKA Robots Exclusion Protocol)

Start the instance, browse to vm/robots.txt and perform a search for flag{:

flag{aec1142c199aa5d8ad0f3ae3fa82e13c}

See In the Dark (REMOVED DUE TO HOST PROVIDER)

Open the onion link in TOR browser for the flag:

flag{a9d40962c465c571fe4edd288bf0f0b5}

Maximum Sound

This one took way longer to pick up on the decoding method than the team would like to admit I reckon! After establishing the file was utilising SSTV, used an online tool to extract the image from the WAV. Cropped the unusual ‘QR’ looking code, which is apparently something called Aztec (Thanks ChatGPT):

Found a decoder online to extract the flag:

flag{d60ea9faec46c2de1c72533ae3ad11d7}

Snooze

Run file command on the provided file - doesn’t give much away. Pop into CyberChef - identifies as tar.z file. Change the extension of the file and run uncompress snooze.tar.z.

cat the flag from returned snooze.tar

flag{c1c07c90efa59876a97c44c2b175903e}