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113 lines
4.3 KiB
Python
113 lines
4.3 KiB
Python
# Mobile Verification Toolkit (MVT)
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# Copyright (c) 2021-2022 The MVT Project Authors.
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# Use of this software is governed by the MVT License 1.1 that can be found at
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# https://license.mvt.re/1.1/
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import logging
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from .base import AndroidExtraction
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log = logging.getLogger(__name__)
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INTENT_NEW_OUTGOING_SMS = "android.provider.Telephony.NEW_OUTGOING_SMS"
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INTENT_SMS_RECEIVED = "android.provider.Telephony.SMS_RECEIVED"
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INTENT_DATA_SMS_RECEIVED = "android.intent.action.DATA_SMS_RECEIVED"
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INTENT_PHONE_STATE = "android.intent.action.PHONE_STATE"
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INTENT_NEW_OUTGOING_CALL = "android.intent.action.NEW_OUTGOING_CALL"
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class DumpsysReceivers(AndroidExtraction):
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"""This module extracts details on receivers for risky activities."""
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def __init__(self, file_path=None, base_folder=None, output_folder=None,
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serial=None, fast_mode=False, log=None, results=[]):
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super().__init__(file_path=file_path, base_folder=base_folder,
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output_folder=output_folder, fast_mode=fast_mode,
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log=log, results=results)
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self.results = results if results else {}
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def check_indicators(self):
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for intent, receivers in self.results.items():
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for receiver in receivers:
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if intent == INTENT_NEW_OUTGOING_SMS:
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self.log.info("Found a receiver to intercept outgoing SMS messages: \"%s\"",
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receiver["receiver"])
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elif intent == INTENT_SMS_RECEIVED:
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self.log.info("Found a receiver to intercept incoming SMS messages: \"%s\"",
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receiver["receiver"])
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elif intent == INTENT_DATA_SMS_RECEIVED:
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self.log.info("Found a receiver to intercept incoming data SMS message: \"%s\"",
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receiver["receiver"])
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elif intent == INTENT_PHONE_STATE:
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self.log.info("Found a receiver monitoring telephony state/incoming calls: \"%s\"",
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receiver["receiver"])
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elif intent == INTENT_NEW_OUTGOING_CALL:
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self.log.info("Found a receiver monitoring outgoing calls: \"%s\"",
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receiver["receiver"])
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ioc = self.indicators.check_app_id(receiver["package"])
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if ioc:
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receiver["matched_indicator"] = ioc
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self.detected.append({intent: receiver})
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continue
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def parse_receiver_resolver_table(self, output):
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in_receiver_resolver_table = False
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in_non_data_actions = False
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intent = None
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for line in output.split("\n"):
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if line.startswith("Receiver Resolver Table:"):
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in_receiver_resolver_table = True
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continue
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if not in_receiver_resolver_table:
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continue
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if line.startswith(" Non-Data Actions:"):
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in_non_data_actions = True
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continue
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if not in_non_data_actions:
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continue
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# If we hit an empty line, the Non-Data Actions section should be
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# finished.
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if line.strip() == "":
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break
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# We detect the action name.
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if line.startswith(" " * 6) and not line.startswith(" " * 8) and ":" in line:
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intent = line.strip().replace(":", "")
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self.results[intent] = []
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continue
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# If we are not in an intent block yet, skip.
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if not intent:
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continue
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# If we are in a block but the line does not start with 8 spaces
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# it means the block ended a new one started, so we reset and
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# continue.
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if not line.startswith(" " * 8):
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intent = None
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continue
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# If we got this far, we are processing receivers for the
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# activities we are interested in.
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receiver = line.strip().split(" ")[1]
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package = receiver.split("/")[0]
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self.results[intent].append({
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"package": package,
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"receiver": receiver,
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})
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def run(self):
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self._adb_connect()
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output = self._adb_command("dumpsys package")
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self.parse_receiver_resolver_table(output)
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self._adb_disconnect()
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