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Code Issues Projects Releases Wiki Activity

Added discovery of Android packages with potentially abusive receivers

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This commit is contained in:
Nex 2021-08-26 14:08:39 +02:00
parent e70054d0c2
commit 0c4eb0bb34
1 changed files with 57 additions and 1 deletions
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58
mvt/android/modules/adb/dumpsys_packages.py
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@ -10,8 +10,12 @@ from .base import AndroidExtraction
log = logging.getLogger(__name__)
EVENT_NEW_OUTGOING_SMS = "android.provider.Telephony.NEW_OUTGOING_SMS"
EVENT_SMS_RECEIVED = "android.provider.Telephony.SMS_RECEIVED"
EVENT_PHONE_STATE = "android.intent.action.PHONE_STATE"
class DumpsysPackages(AndroidExtraction):
"""This module extracts stats on installed packages."""
"""This module extracts details on installed packages."""
def __init__(self, file_path=None, base_folder=None, output_folder=None,
serial=None, fast_mode=False, log=None, results=[]):
@ -19,10 +23,62 @@ class DumpsysPackages(AndroidExtraction):
output_folder=output_folder, fast_mode=fast_mode,
log=log, results=results)
def _find_suspicious_packages(self, output):
"""Parse dumpsys packages output to find packages with active receivers
that could be abusive.
"""
activity = None
for line in output.split("\n"):
# Find activity block markers.
if line.strip().startswith(EVENT_NEW_OUTGOING_SMS):
activity = EVENT_NEW_OUTGOING_SMS
continue
elif line.strip().startswith(EVENT_SMS_RECEIVED):
activity = EVENT_SMS_RECEIVED
continue
elif line.strip().startswith(EVENT_PHONE_STATE):
activity = EVENT_PHONE_STATE
continue
# If we are not in an activity block yet, skip.
if not activity:
continue
# If we are in a block but the line does not start with 8 spaces
# it means the block ended a new one started, so we reset and
# continue.
if not line.startswith(" " * 8):
activity = None
continue
# If we got this far, we are processing receivers for the
# activities we are interested in.
receiver = line.strip().split(" ")[1]
if receiver.split("/")[0] == "com.google.android.gms":
continue
if activity == EVENT_NEW_OUTGOING_SMS:
self.log.warning("Found a receiver to intercept outgoing SMS messages: \"%s\"",
receiver)
elif activity == EVENT_SMS_RECEIVED:
self.log.warning("Found a receiver to intercept incoming SMS messages: \"%s\"",
receiver)
elif activity == EVENT_PHONE_STATE:
self.log.warning("Found a receiver monitoring telephony state: \"%s\"",
receiver)
self.detected.append({
"activity": activity,
"receiver": receiver,
})
def run(self):
self._adb_connect()
output = self._adb_command("dumpsys package")
self._find_suspicious_packages(output)
if self.output_folder:
packages_path = os.path.join(self.output_folder,
"dumpsys_packages.txt")