We have recently received reports about a hacker who goes by the alias und3rm4t3r. He has been threatening innocent people for money and must be stopped.
Help us find him and get us the flag.
Checking the challenge description reveals a username und3rm4t3r .
Upon searching the username on twitter we see an interesting profile with several tweets.
However this one sticks out:
Reading this reveals that the user deleted a tweet which was accidentally tweeted out. So, checking the wayback machine for the users profile reveals that there was a snapshot of the page taken on 23th July and one of the tweets contain the flag.
Flag: DUCTF{w4y_b4ck_1n_t1m3_w3_g0}