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packages.py
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packages.py
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# Mobile Verification Toolkit (MVT)
# Copyright (c) 2021-2023 The MVT Authors.
# Use of this software is governed by the MVT License 1.1 that can be found at
# https://license.mvt.re/1.1/
import logging
from typing import Optional, Union
from rich.console import Console
from rich.progress import track
from rich.table import Table
from rich.text import Text
from mvt.android.artifacts.dumpsys_packages import DumpsysPackagesArtifact
from mvt.android.utils import (
DANGEROUS_PERMISSIONS,
DANGEROUS_PERMISSIONS_THRESHOLD,
ROOT_PACKAGES,
SECURITY_PACKAGES,
SYSTEM_UPDATE_PACKAGES,
)
from mvt.common.virustotal import VTNoKey, VTQuotaExceeded, virustotal_lookup
from .base import AndroidExtraction
class Packages(AndroidExtraction):
"""This module extracts the list of installed packages."""
def __init__(
self,
file_path: Optional[str] = None,
target_path: Optional[str] = None,
results_path: Optional[str] = None,
module_options: Optional[dict] = None,
log: logging.Logger = logging.getLogger(__name__),
results: Optional[list] = None,
) -> None:
super().__init__(
file_path=file_path,
target_path=target_path,
results_path=results_path,
module_options=module_options,
log=log,
results=results,
)
self._user_needed = False
def serialize(self, record: dict) -> Union[dict, list]:
records = []
timestamps = [
{"event": "package_install", "timestamp": record["timestamp"]},
{
"event": "package_first_install",
"timestamp": record["first_install_time"],
},
{"event": "package_last_update", "timestamp": record["last_update_time"]},
]
for timestamp in timestamps:
records.append(
{
"timestamp": timestamp["timestamp"],
"module": self.__class__.__name__,
"event": timestamp["event"],
"data": f"{record['package_name']} (system: {record['system']},"
f" third party: {record['third_party']})",
}
)
return records
def check_indicators(self) -> None:
for result in self.results:
if result["package_name"] in ROOT_PACKAGES:
self.log.warning(
"Found an installed package related to "
'rooting/jailbreaking: "%s"',
result["package_name"],
)
self.detected.append(result)
continue
if result["package_name"] in SECURITY_PACKAGES and result["disabled"]:
self.log.warning(
'Found a security package disabled: "%s"', result["package_name"]
)
if result["package_name"] in SYSTEM_UPDATE_PACKAGES and result["disabled"]:
self.log.warning(
'System OTA update package "%s" disabled on the phone',
result["package_name"],
)
if not self.indicators:
continue
ioc = self.indicators.check_app_id(result.get("package_name"))
if ioc:
result["matched_indicator"] = ioc
self.detected.append(result)
continue
for package_file in result.get("files", []):
ioc = self.indicators.check_file_hash(package_file["sha256"])
if ioc:
result["matched_indicator"] = ioc
self.detected.append(result)
@staticmethod
def check_virustotal(packages: list) -> None:
hashes = []
for package in packages:
for file in package.get("files", []):
if file["sha256"] not in hashes:
hashes.append(file["sha256"])
total_hashes = len(hashes)
detections = {}
progress_desc = f"Looking up {total_hashes} files..."
for i in track(range(total_hashes), description=progress_desc):
try:
results = virustotal_lookup(hashes[i])
except VTNoKey:
return
except VTQuotaExceeded as exc:
print("Unable to continue: %s", exc)
break
if not results:
continue
positives = results["attributes"]["last_analysis_stats"]["malicious"]
total = len(results["attributes"]["last_analysis_results"])
detections[hashes[i]] = f"{positives}/{total}"
table = Table(title="VirusTotal Packages Detections")
table.add_column("Package name")
table.add_column("File path")
table.add_column("Detections")
for package in packages:
for file in package.get("files", []):
row = [package["package_name"], file["path"]]
if file["sha256"] in detections:
detection = detections[file["sha256"]]
positives = detection.split("/")[0]
if int(positives) > 0:
row.append(Text(detection, "red bold"))
else:
row.append(detection)
else:
row.append("not found")
table.add_row(*row)
console = Console()
console.print(table)
@staticmethod
def parse_package_for_details(output: str) -> dict:
lines = []
in_packages = False
for line in output.splitlines():
if in_packages:
if line.strip() == "":
break
lines.append(line)
if line.strip() == "Packages:":
in_packages = True
return DumpsysPackagesArtifact.parse_dumpsys_package_for_details(
"\n".join(lines)
)
def _get_files_for_package(self, package_name: str) -> list:
command = f"pm path {package_name}"
if self._user_needed:
command += " --user 0"
output = self._adb_command(command)
output = output.strip().replace("package:", "")
if not output:
return []
package_files = []
for file_path in output.splitlines():
file_path = file_path.strip()
md5 = self._adb_command(f"md5sum {file_path}").split(" ", maxsplit=1)[0]
sha1 = self._adb_command(f"sha1sum {file_path}").split(" ", maxsplit=1)[0]
sha256 = self._adb_command(f"sha256sum {file_path}").split(" ", maxsplit=1)[
0
]
sha512 = self._adb_command(f"sha512sum {file_path}").split(" ", maxsplit=1)[
0
]
package_files.append(
{
"path": file_path,
"md5": md5,
"sha1": sha1,
"sha256": sha256,
"sha512": sha512,
}
)
return package_files
def run(self) -> None:
self._adb_connect()
packages = self._adb_command("pm list packages -u -i -f")
if "java.lang.SecurityException" in packages or packages.strip() == "":
self._user_needed = True
packages = self._adb_command("pm list packages -u -i -f --user 0")
for line in packages.splitlines():
line = line.strip()
if not line.startswith("package:"):
continue
fields = line.split()
file_name, package_name = fields[0].split(":")[1].rsplit("=", 1)
try:
installer = fields[1].split("=")[1].strip()
except IndexError:
installer = None
else:
if installer == "null":
installer = None
package_files = self._get_files_for_package(package_name)
new_package = {
"package_name": package_name,
"file_name": file_name,
"installer": installer,
"disabled": False,
"system": False,
"third_party": False,
"files": package_files,
}
dumpsys_package = self._adb_command(f"dumpsys package {package_name}")
package_details = self.parse_package_for_details(dumpsys_package)
new_package.update(package_details)
self.results.append(new_package)
cmds = [
{"field": "disabled", "arg": "-d"},
{"field": "system", "arg": "-s"},
{"field": "third_party", "arg": "-3"},
]
for cmd in cmds:
command = f"pm list packages {cmd['arg']}"
if self._user_needed:
command += " --user 0"
output = self._adb_command(command)
for line in output.splitlines():
line = line.strip()
if not line.startswith("package:"):
continue
package_name = line.split(":", 1)[1]
for i, result in enumerate(self.results):
if result["package_name"] == package_name:
self.results[i][cmd["field"]] = True
for result in self.results:
if not result["third_party"]:
continue
dangerous_permissions_count = 0
for perm in result["requested_permissions"]:
if perm in DANGEROUS_PERMISSIONS:
dangerous_permissions_count += 1
if dangerous_permissions_count >= DANGEROUS_PERMISSIONS_THRESHOLD:
self.log.info(
'Third-party package "%s" requested %d '
"potentially dangerous permissions",
result["package_name"],
dangerous_permissions_count,
)
packages_to_lookup = []
for result in self.results:
if result["system"]:
continue
packages_to_lookup.append(result)
self.log.info(
'Found non-system package with name "%s" installed by "%s" on %s',
result["package_name"],
result["installer"],
result["timestamp"],
)
if not self.module_options.get("fast_mode", None):
self.check_virustotal(packages_to_lookup)
self.log.info(
"Extracted at total of %d installed package names", len(self.results)
)
self._adb_disconnect()