add colab

colab.md

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+# Reverse Shell Colab Notebook
+
+## Steps:
+
+1. Install cloudflared
+- https://developers.cloudflare.com/cloudflare-one/connections/connect-networks/downloads/
+```bash
+!curl -L https://github.com/cloudflare/cloudflared/releases/latest/download/cloudflared-linux-amd64.deb -o cloudflared.deb
+!sudo dpkg -i cloudflared.deb
+!sudo apt-get install -f
+```
+2. Install pm2
+```bash
+!npm install -g pm2
+```
+3. Install netcat from source
+
+```
+!wget http://sourceforge.net/projects/netcat/files/netcat/0.7.1/netcat-0.7.1.tar.gz
+!tar -xvf netcat-0.7.1.tar.gz
+!cd netcat-0.7.1 && ./configure
+!cd netcat-0.7.1 && sudo make && sudo make install
+!mv /usr/local/bin/nc /usr/local/bin/nothing
+!nothing -h
+```
+
+4. Start reverse shell
+
+- nothing.sh
+```bash
+#!/bin/bash
+
+nothing -l -p 8888 -e /bin/bash
+```
+
+```
+!pm2 start nothing.sh --name nothing --watch
+```
+
+5. Start cloudflared tunnel
+
+- tunnel.sh
+```bash
+#!/bin/bash
+
+cloudflared tunnel --url tcp://localhost:8888
+```
+
+```bash
+!pm2 start tunnel.sh --name tunnel
+!pm2 logs tunnel #get the domain
+```
+
+6. From local machine:
+- Install cloudflared
+    - Docs: https://developers.cloudflare.com/cloudflare-one/applications/non-http/cloudflared-authentication/arbitrary-tcp/
+    ```
+    cloudflared access tcp --hostname tcp.site.com --url localhost:8888
+
+    ```
+- Connect via netcat
+
+```bash
+nc localhost 8888
+python -c 'import pty; pty.spawn("/bin/bash")'
+```
+
+
+
+## Commands
+
+```bash
+%%capture --no-display
+!pm2 start server.py --name server --watch && pm2 start tunnel.sh --name tunnel
+
+!cloudflared tunnel --url http://localhost:8888
+!cloudflared tunnel --url tcp://localhost:8888
+
+!pm2 logs nothing --lines 100
+!pm2 flush
+!pm2 logs
+!pm2 status
+!pm2 stop all
+!pm2 delete all
+
+```
+
+- https://www.ucartz.com/clients/knowledgebase/658/How-to-Install-and-Use-netcat-Command-on-Linux.html