class Dex(File, DexParserInterface):
__FILE_NAME_CLASSES_DEX = "classes.dex"
# Class constructor.
#
# @param filepath The classes.dex file path.
# @param string_processing If True (default), the URLs and shell commands in the classes.dex will be extracted.
#
def __init__(self, filepath, string_processing=True):
super(Dex, self).__init__(filepath, "classes.dex")
self._strings = []
self._urls = []
self._shell_commands = []
self._custom_signatures = []
self._extract_and_set_strings()
if string_processing:
self._extract_and_set_substring_from()
##
# Extract the strings from the classes.dex file and set the correspondent attributes. Empty strings will be removed.
#
def _extract_and_set_strings(self):
command = "strings " + self.get_file_path()
process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=None, shell=True)
self._strings = process.communicate()[0].decode("utf-8").splitlines()
self._strings.sort()
while "" in self._strings:
self._strings.remove("")
##
# Extract the strings from the classes.dex file and set the correspondent attributes. Empty strings will be removed.
#
def _extract_and_set_substring_from(self):
for string in self._strings:
if string == "":
continue
self._extract_and_set_urls_from(string)
self._extract_and_set_shell_commands_from(string)
#self._extract_and_set_signatures_from(string)
self._urls.sort()
self._shell_commands.sort()
#self._custom_signatures.sort()
##
# Extract eventual URLs from a string and set the correspondent attribute.
#
# @param string The string from which extracting the eventual URLs.
#
def _extract_and_set_urls_from(self, string):
if not hasattr(self, "_uri"):
self._uri_signature = URISignature()
if len(string) > 6:
url = self._uri_signature.get_matches_in_string(string)
if url != "" and url not in self._urls:
self._urls.append(url)
##
# Extract eventual shell commands from a string and set the correspondent attribute.
#
# @param string The string from which extracting the eventual shell commands.
#
def _extract_and_set_shell_commands_from(self, string):
if not hasattr(self, "_shell"):
self._shell_signature = ShellCommandSignature()
command = self._shell_signature.get_matches_in_string(string)
if command != "" and command not in self._shell_commands:
self._shell_commands.append(command)
##
# Extract eventual signatures from a string and set the correspondent attribute.
#
# @param string The string from which extracting the eventual signatures.
#
def _extract_and_set_signatures_from(self, string):
if not hasattr(self, "_shell"):
self._generic_signature = Signature()
match = self._generic_signature.get_matches_in_string(string)
if match != "" and match not in self._custom_signatures:
self._custom_signatures.append(match)
@staticmethod
def looks_like_a_dex(filename):
return filename == Dex.__FILE_NAME_CLASSES_DEX
def dump(self):
dump = super(Dex, self).dump()
dump["urls"] = self._urls
dump["shell_commands"] = self._shell_commands
#dump["custom_signatures"] = self._custom_signatures
dump["strings"] = self._strings
return dump
def get_strings(self):
return self._strings
def get_urls(self):
return self._urls
def get_shell_commands(self):
return self._shell_commands
def get_custom_signatures(self):
return self._custom_signatures
def _extract_and_set_signatures_from(self, string):
if not hasattr(self, "_shell"):
self._generic_signature = Signature()
match = self._generic_signature.get_matches_in_string(string)
if match != "" and match not in self._custom_signatures:
self._custom_signatures.append(match)
def setUpClass(cls):
cls.signature = Signature()