fix: override of exec method by default arg

Author: snowpeacock

nxc/helpers/args.py

@@ -1,4 +1,5 @@
 from argparse import ArgumentDefaultsHelpFormatter, SUPPRESS, OPTIONAL, ZERO_OR_MORE
+from argparse import Action
 
 class DisplayDefaultsNotNone(ArgumentDefaultsHelpFormatter):
     def _get_help_string(self, action):
@@ -7,4 +8,18 @@ def _get_help_string(self, action):
             defaulting_nargs = [OPTIONAL, ZERO_OR_MORE]
             if (action.option_strings or action.nargs in defaulting_nargs) and action.default:  # Only add default info if it's not None
                 help_string += " (default: %(default)s)"  # NORUFF
-        return help_string
+        return help_string
+
+
+class DefaultTrackingAction(Action):
+    def __init__(self, option_strings, dest, default=None, required=False, **kwargs):
+        # Store the default value to check later
+        self.default_value = default
+        super().__init__(
+            option_strings, dest, default=default, required=required, **kwargs
+        )
+
+    def __call__(self, parser, namespace, values, option_string=None):
+        # Set an attribute to track whether the value was explicitly set
+        setattr(namespace, self.dest, values)
+        setattr(namespace, f"{self.dest}_explicitly_set", True)

nxc/protocols/smb.py

@@ -619,7 +619,7 @@ def gen_relay_list(self):
 
     @requires_admin
     def execute(self, payload=None, get_output=False, methods=None):
-        if self.args.exec_method:
+        if getattr(self.args, "exec_method_explicitly_set", False):
             methods = [self.args.exec_method]
         if not methods:
             methods = ["wmiexec", "atexec", "smbexec", "mmcexec"]

nxc/protocols/smb/proto_args.py

@@ -1,18 +1,18 @@
 from argparse import _StoreTrueAction
-from nxc.helpers.args import DisplayDefaultsNotNone
+from nxc.helpers.args import DisplayDefaultsNotNone, DefaultTrackingAction
 
 
 def proto_args(parser, parents):
     smb_parser = parser.add_parser("smb", help="own stuff using SMB", parents=parents, formatter_class=DisplayDefaultsNotNone)
     smb_parser.add_argument("-H", "--hash", metavar="HASH", dest="hash", nargs="+", default=[], help="NTLM hash(es) or file(s) containing NTLM hashes")
-    
+
     delegate_arg = smb_parser.add_argument("--delegate", action="store", help="Impersonate user with S4U2Self + S4U2Proxy")
     self_delegate_arg = smb_parser.add_argument("--self", dest="no_s4u2proxy", action=get_conditional_action(_StoreTrueAction), make_required=[], help="Only do S4U2Self, no S4U2Proxy (use with delegate)")
-    
+
     dgroup = smb_parser.add_mutually_exclusive_group()
     dgroup.add_argument("-d", "--domain", metavar="DOMAIN", dest="domain", type=str, help="domain to authenticate to")
     dgroup.add_argument("--local-auth", action="store_true", help="authenticate locally to each target")
-    
+
     smb_parser.add_argument("--port", type=int, default=445, help="SMB port")
     smb_parser.add_argument("--share", metavar="SHARE", default="C$", help="specify a share")
     smb_parser.add_argument("--smb-server-port", default="445", help="specify a server port for SMB", type=int)
@@ -47,7 +47,7 @@ def proto_args(parser, parents):
     mapping_enum_group.add_argument("--local-groups", nargs="?", const="", metavar="GROUP", help="enumerate local groups, if a group is specified then its members are enumerated")
     mapping_enum_group.add_argument("--pass-pol", action="store_true", help="dump password policy")
     mapping_enum_group.add_argument("--rid-brute", nargs="?", type=int, const=4000, metavar="MAX_RID", help="enumerate users by bruteforcing RIDs")
-    
+
     wmi_group = smb_parser.add_argument_group("WMI", "Options for WMI Queries")
     wmi_group.add_argument("--wmi", metavar="QUERY", type=str, help="issues the specified WMI query")
     wmi_group.add_argument("--wmi-namespace", metavar="NAMESPACE", default="root\\cimv2", help="WMI Namespace")
@@ -69,7 +69,7 @@ def proto_args(parser, parents):
     files_group.add_argument("--append-host", action="store_true", help="append the host to the get-file filename")
 
     cmd_exec_group = smb_parser.add_argument_group("Command Execution", "Options for executing commands")
-    cmd_exec_group.add_argument("--exec-method", choices={"wmiexec", "mmcexec", "smbexec", "atexec"}, default="wmiexec", help="method to execute the command. Ignored if in MSSQL mode")
+    cmd_exec_group.add_argument("--exec-method", choices={"wmiexec", "mmcexec", "smbexec", "atexec"}, default="wmiexec", help="method to execute the command. Ignored if in MSSQL mode", action=DefaultTrackingAction)
     cmd_exec_group.add_argument("--dcom-timeout", help="DCOM connection timeout", type=int, default=5)
     cmd_exec_group.add_argument("--get-output-tries", help="Number of times atexec/smbexec/mmcexec tries to get results", type=int, default=10)
     cmd_exec_group.add_argument("--codec", default="utf-8", help="Set encoding used (codec) from the target's output. If errors are detected, run chcp.com at the target & map the result with https://docs.python.org/3/library/codecs.html#standard-encodings and then execute again with --codec and the corresponding codec")
@@ -78,15 +78,14 @@ def proto_args(parser, parents):
     cmd_exec_method_group = cmd_exec_group.add_mutually_exclusive_group()
     cmd_exec_method_group.add_argument("-x", metavar="COMMAND", dest="execute", help="execute the specified CMD command")
     cmd_exec_method_group.add_argument("-X", metavar="PS_COMMAND", dest="ps_execute", help="execute the specified PowerShell command")
-    
+
     posh_group = smb_parser.add_argument_group("Powershell Obfuscation", "Options for PowerShell script obfuscation")
     posh_group.add_argument("--obfs", action="store_true", help="Obfuscate PowerShell scripts")
     posh_group.add_argument("--amsi-bypass", nargs=1, metavar="FILE", help="File with a custom AMSI bypass")
     posh_group.add_argument("--clear-obfscripts", action="store_true", help="Clear all cached obfuscated PowerShell scripts")
     posh_group.add_argument("--force-ps32", action="store_true", help="force PowerShell commands to run in a 32-bit process (may not apply to modules)")
     posh_group.add_argument("--no-encode", action="store_true", default=False, help="Do not encode the PowerShell command ran on target")
 
-
     return parser
 
 def get_conditional_action(baseAction):
@@ -101,4 +100,4 @@ def __call__(self, parser, namespace, values, option_string=None):
                 x.required = True
             super().__call__(parser, namespace, values, option_string)
 
-    return ConditionalAction
+    return ConditionalAction