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import volatility.plugins.taskmods as taskmods |
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import volatility.win32.tasks as tasks |
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import volatility.utils as utils |
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import volatility.debug as debug |
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import volatility.plugins.malware.malfind as malfind |
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import re |
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import json |
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from struct import unpack, unpack_from |
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try: |
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import yara |
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has_yara = True |
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except ImportError: |
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has_yara = False |
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noderat_sig = { |
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'namespace1' : 'rule Noderat { \ |
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strings: \ |
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$config = "/config/app.json" \ |
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$key = "/config/.regeditKey.rc" \ |
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$message = "uninstall error when readFileSync: " \ |
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condition: all of them}' |
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} |
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CONFIG_PATTERNS = [re.compile("\x7B\x0D\x0A\x20\x20\x22\x6E\x61\x6D\x65\x22\x3A\x20(.*)\x65\x0d\x0a\x7d", re.DOTALL)] |
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class noderatConfig(taskmods.DllList): |
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"Parse the Noderat configuration" |
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@staticmethod |
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def is_valid_profile(profile): |
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return (profile.metadata.get('os', 'unknown') == 'windows'), profile.metadata.get('memory_model', '32bit') |
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def get_vad_base(self, task, address): |
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for vad in task.VadRoot.traverse(): |
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if address >= vad.Start and address < vad.End: |
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return vad.Start, vad.End |
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return None |
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def calculate(self): |
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if not has_yara: |
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debug.error('Yara must be installed for this plugin.') |
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addr_space = utils.load_as(self._config) |
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os, memory_model = self.is_valid_profile(addr_space.profile) |
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if not os: |
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debug.error('This command does not support the selected profile.') |
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rules = yara.compile(sources=noderat_sig) |
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for task in self.filter_tasks(tasks.pslist(addr_space)): |
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scanner = malfind.VadYaraScanner(task=task, rules=rules) |
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for hit, address in scanner.scan(): |
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vad_base_addr, end = self.get_vad_base(task, address) |
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proc_addr_space = task.get_process_address_space() |
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memdata = proc_addr_space.get_available_addresses() |
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config_data = [] |
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for m in memdata: |
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if m[1] < 0x100000: |
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continue |
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p_data = {} |
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data = proc_addr_space.zread(m[0], m[1]) |
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for pattern in CONFIG_PATTERNS: |
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m = re.search(pattern, data) |
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if m: |
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offset = m.start() |
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else: |
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continue |
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json_data = data[offset:m.end()] |
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d = json.loads(json_data) |
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config_data.append(d) |
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break |
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yield task, vad_base_addr, end, hit, memory_model, config_data |
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break |
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def render_text(self, outfd, data): |
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delim = '-' * 70 |
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for task, start, end, malname, memory_model, config_data in data: |
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outfd.write("{0}\n".format(delim)) |
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outfd.write("Process: {0} ({1})\n\n".format(task.ImageFileName, task.UniqueProcessId)) |
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outfd.write("[Config Info]\n") |
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for p_data in config_data: |
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for id, param in p_data.items(): |
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outfd.write("{0:<10}: {1}\n".format(id, param)) |
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