[noxCTF] Muhammad Ali

Challenge by JohnE

Challenge description: Muhammad Ali: “I’ve Ceen Many Pictures of Knocking-out in my career” special idea: 1)The main idea of the challenge is ICMP Knocking. 2)This is not a Stego challenge, this is a Networking challenge! 3)solving without understanding(frame contains “flag”/“noxctf”,follow each tcp stream) will lead you to stego dead end. Writeup: At the beginning of the challenge we get a description: Muhammad Ali: “I’ve Ceen Many Pictures of Knocking-out in my career” ok, it seems like we need to search picture files of knockouts inside the pcap file. [Read More]

[noxCTF] Reverse

Challenge by JohnE

Note: this is not a Reverse challenge Note: change the flag format from noxctf{X-X-X} to noxCTF{X_X_X} Writeup At the beginning of the challenge we get an executable file, that looks like cmd. Lets start running commands and look if we see something suspicious But so far it seems like normal limited cmd. When we call the ‘netstat’ command we get a constant output: Netstat- Displays protocol statistics and current TCP/IP network connections. [Read More]

[noxCTF] SUBliminal

Challenge by JohnE

Challenge description: “SUBliminal is an Israeli rapper that eschew from Illegal things. (don’t smoke weed everyday)“. goo.gl/pSGubK special idea: 1. To understand that we interested in the data of the packet that has been sent from illegal subnet ip. 2. To understand that illegal subnet address is an address that belong to subnet(start with 10 or 192) and don’t implement the rest of the mask: 10.0.0.? Writeup: So, at the beginning of the challenge we get a note: ‚ÄúSUBliminal is an Israeli rapper that eschew from Illegal things. [Read More]