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shutdownlog.py
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shutdownlog.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 mvt.common.utils import convert_mactime_to_iso
from ..base import IOSExtraction
SHUTDOWN_LOG_PATH = [
"private/var/db/diagnostics/shutdown.log",
]
class ShutdownLog(IOSExtraction):
"""This module extracts processes information from the shutdown log file."""
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,
)
def serialize(self, record: dict) -> Union[dict, list]:
return {
"timestamp": record["isodate"],
"module": self.__class__.__name__,
"event": "shutdown",
"data": f"Client {record['client']} with PID {record['pid']} "
"was running when the device was shut down",
}
def check_indicators(self) -> None:
if not self.indicators:
return
for result in self.results:
ioc = self.indicators.check_file_path(result["client"])
if ioc:
result["matched_indicator"] = ioc
self.detected.append(result)
continue
for ioc in self.indicators.get_iocs("processes"):
parts = result["client"].split("/")
if ioc in parts:
self.log.warning(
'Found mention of a known malicious process "%s" in '
"shutdown.log",
ioc,
)
result["matched_indicator"] = ioc
self.detected.append(result)
continue
def process_shutdownlog(self, content):
current_processes = []
recent_processes = []
times_delayed = 0
delay = 0.0
for line in content.split("\n"):
line = line.strip()
if line.startswith("remaining client pid:"):
current_processes.append(
{
"pid": line[line.find("pid: ") + 5 : line.find(" (")],
"client": line[line.find("(") + 1 : line.find(")")],
"delay": delay,
"times_delayed": times_delayed,
}
)
elif line.startswith("After "):
# Consider the previous processes
# End of the current processes
for p in current_processes:
recent_processes.append(p)
delay += float(line.split(" ")[1][:-2])
times_delayed += 1
current_processes = []
elif line.startswith("SIGTERM: "):
for p in current_processes:
recent_processes.append(p)
try:
mac_timestamp = int(line[line.find("[") + 1 : line.find("]")])
except ValueError:
try:
start = line.find(" @") + 2
mac_timestamp = int(line[start : start + 10])
except Exception:
mac_timestamp = 0
isodate = convert_mactime_to_iso(mac_timestamp, from_2001=False)
for process in recent_processes:
self.results.append(
{
"isodate": isodate,
"pid": process["pid"],
"client": process["client"],
"delay": process["delay"],
"times_delayed": process["times_delayed"],
}
)
current_processes = []
recent_processes = []
times_delayed = 0
delay = 0.0
self.results = sorted(self.results, key=lambda entry: entry["isodate"])
def run(self) -> None:
self._find_ios_database(root_paths=SHUTDOWN_LOG_PATH)
self.log.info("Found shutdown log at path: %s", self.file_path)
with open(self.file_path, "r", encoding="utf-8") as handle:
self.process_shutdownlog(handle.read())