SymRPC

Statically enumerate RPC interfaces of Windows services.

Features

• Extracts arguments to RpcServerRegisterIf* functions and parses interface structures
• Extracts arguments authentication and protocol sequence registration functions
• Symbolically executes interface security callbacks (if available) to extract complex security checks
• Outputs a list of valid clients that are allowed to the RPC server + any extra checks made by the security callback

See example-reports/ for an example output. Valid clients are shown under the possible_clients field

Usage

To set up a virtual environment run:

python -m venv venv

pip install -r requirements.txt && pip install angrcache\

Usage:

symrpc.py [-h] [-t TIMEOUT] [-s SERVICES [SERVICES ...]] [-r REPORT_DIR] [-c CACHE_NAME] [-l LOGGING_LEVEL] [-e]
                 [-p SYMBOLS_DIR]

Statically enumerate RPC interfaces of Windows services

optional arguments:
  -h, --help            show this help message and exit
  -t TIMEOUT, --timeout TIMEOUT
                        Timeout for analyzing each service (default: 0; no timeout)
  -s SERVICES [SERVICES ...], --services SERVICES [SERVICES ...]
                        Service name(s) or path(s) to analyze (default: all)
  -r REPORT_DIR, --report-dir REPORT_DIR
                        Directory to store analysis results (default: reports)
  -c CACHE_NAME, --cache-name CACHE_NAME
                        Path to store cached angr analysis results (e.g. CFGs, loaded PEs, etc...) (default: projectcache\cache)
  -l LOGGING_LEVEL, --logging-level LOGGING_LEVEL
                        Logging level (default: INFO)
  -p SYMBOLS_DIR, --symbols-dir SYMBOLS_DIR
                        Directory to pdb files containing symbols. Must be in the format [SYMBOLS_DIR]\[dll_name].pdb\[DLL GUID]\[dll_name].pdb

Example: python ./symrpc.py -s AppInfo -p ./symbols

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Copyright 2023 Mounir Elgharabawy

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.