Neurosoft is recruiting part 1: re_challenge3

Output of the program after entering the character ‘F’ as input
#!/bin/bashflag=""while true; do    k=$(echo $flag | ./re_challenge3 | tr -d '\0' | sed -n '2p')    flag="$flag${k:0:1}"    echo "$flag"    if [ -z "${k:0:1}" ]; then
break
fi
done
Sure, you can already see parts of the flag in IDA, but the program outputs what to feed itself with, so don’t waste time understanding how the program does it.
Alexandre-Xavier Labonté-Lamoureux

Written by

Software Engineering student at École de Technologie Supérieure

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