switcheroo (50 pts, 344 solved)

It’s a busy weekend, tens of CTFs happening at the same time :) If there is extra time, why not checkout https://wolvctf.io?Btw, take this as a gift: d2N0ZntNNDF6M180bmRfQmx1M30K

Solution

Discovery Phase

Browse the website in the description. You will discover the WolvCTF, which takes place simultaneously with the B01lers CTF.

WolvCTF website

At this point, you need to register to access the challenges. After this, scrolling through the challenges, in the Mist category, you can see the Switcheroo challenge.

Switcheroo

It’s a busy weekend, with tens of CTF happening at the same time :) If there is extra time, why not check out https://ctf.b01lers.com? BTW, take this as a gift: YmN0ZntoMzExMF93MHIxZF9nMWY3X2ZyMG1fN2gzX2IwMWxlcl9zMWQzfQ==

Solution

The given string is obviously base64 encoded:

!echo -n "YmN0ZntoMzExMF93MHIxZF9nMWY3X2ZyMG1fN2gzX2IwMWxlcl9zMWQzfQ==" | base64 -d

The printed result is the flag we were looking for:

bctf{h3110_w0r1d_g1f7_fr0m_7h3_b01ler_s1d3}