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# Detecting Nanocore RAT for Volatilitv
#
# Based on the script below:
# https://github.com/kevthehermit/RATDecoders/blob/master/decoders/NanoCore.py
#
# How to use:
# 1. cd "Volatility Folder"
# 2. mv nanocoreconfigallocate.py volatility/plugins/malware
# 3. python vol.py nanocoreconfig -f images.mem --profile=Win7SP1x64
import volatility.plugins.taskmods as taskmods
import volatility.win32.tasks as tasks
import volatility.utils as utils
import volatility.debug as debug
import volatility.plugins.malware.malfind as malfind
import re
from struct import unpack, unpack_from
from collections import OrderedDict
try:
import yara
has_yara = True
except ImportError:
has_yara = False
nanocore_sig = {
'namespace1' : 'rule Nanocore { \
strings: \
$v1 = "NanoCore Client" \
$v2 = "PluginCommand" \
$v3 = "CommandType" \
condition: all of them}'
}
# Config pattern
CONFIG_PATTERNS = [re.compile("Version.\x07(.*?)\x0cMutex", re.DOTALL)]
MODE = {0x0: "Disable", 0x01: "Enable"}
class nanocoreConfig(taskmods.DllList):
"Parse the Nanocore configuration"
@staticmethod
def is_valid_profile(profile):
return (profile.metadata.get('os', 'unknown') == 'windows'), profile.metadata.get('memory_model', '32bit')
def get_vad_base(self, task, address):
for vad in task.VadRoot.traverse():
if address >= vad.Start and address < vad.End:
return vad.Start, vad.End
return None
def parse_config(self, data):
p_data = OrderedDict()
p_data['Version'] = re.search('Version..(.*?)\x0c', data).group()[8:16]
p_data['Mutex'] = re.search('Mutex(.*?)\x0c', data).group()[6:-1].encode('hex')
p_data['Group'] = re.search('DefaultGroup\x0c(.*?)\x0c', data).group()[14:-1]
p_data['Domain1'] = re.search('PrimaryConnectionHost\x0c(.*?)Back', data, re.DOTALL).group()[23:-6]
p_data['Domain2'] = re.search('BackupConnectionHost\x0c(.*?)\x0c', data).group()[22:-1]
p_data['Port'] = unpack("<H", re.search('ConnectionPort...', data, re.DOTALL).group()[15:])[0]
try:
p_data['KeyboardLogging'] = MODE[ord(re.search('KeyboardLogging(.*?)\x0c', data).group()[16:-1])]
except:
pass
p_data['RunOnStartup'] = MODE[ord(re.search('RunOnStartup(.*?)\x0c', data).group()[13:-1])]
p_data['RequestElevation'] = MODE[ord(re.search('RequestElevation(.*?)\x0c', data).group()[17:-1])]
p_data['BypassUAC'] = MODE[ord(re.search('BypassUserAccountControl(.*?)\x0c', data).group()[25:-1])]
p_data['ClearZoneIdentifier'] = MODE[ord(re.search('ClearZoneIdentifier(.*?)\x0c', data).group()[20:-1])]
p_data['ClearAccessControl'] = MODE[ord(re.search('ClearAccessControl(.*?)\x0c', data).group()[19:-1])]
p_data['SetCriticalProcess'] = MODE[ord(re.search('SetCriticalProcess(.*?)\x0c', data).group()[19:-1])]
p_data['PreventSystemSleep'] = MODE[ord(re.search('PreventSystemSleep(.*?)\x0c', data).group()[19:-1])]
p_data['ActivateAwayMode'] = MODE[ord(re.search('ActivateAwayMode(.*?)\x0c', data).group()[17:-1])]
p_data['EnableDebugMode'] = MODE[ord(re.search('EnableDebugMode(.*?)\x0c', data).group()[16:-1])]
p_data['RunDelay'] = unpack("<i", re.search('RunDelay(.*?)\x0c', data).group()[9:-1])[0]
p_data['ConnectDelay'] = unpack("<i", re.search('ConnectDelay(.*?)\x0c', data).group()[13:-1])[0]
p_data['RestartDelay'] = unpack("<i", re.search('RestartDelay(.*?)\x0c', data).group()[13:-1])[0]
p_data['TimeoutInterval'] = unpack("<i", re.search('TimeoutInterval(.*?)\x0c', data).group()[16:-1])[0]
p_data['KeepAliveTimeout'] = unpack("<i", re.search('KeepAliveTimeout(.*?)\x0c', data).group()[17:-1])[0]
p_data['MutexTimeout'] = unpack("<i", re.search('MutexTimeout(.*?)\x0c', data).group()[13:-1])[0]
p_data['LanTimeout'] = unpack("<i", re.search('LanTimeout(.*?)\x0c', data).group()[11:-1])[0]
p_data['WanTimeout'] = unpack("<i", re.search('WanTimeout(.*?)\x0c', data).group()[11:-1])[0]
p_data['BufferSize'] = re.search('BufferSize(.*?)\x0c', data).group()[11:-1].encode('hex')
p_data['MaxPacketSize'] = re.search('MaxPacketSize(.*?)\x0c', data).group()[14:-1].encode('hex')
p_data['GCThreshold'] = re.search('GCThreshold(.*?)\x0c', data).group()[12:-1].encode('hex')
try:
p_data['UseCustomDNS'] = MODE[ord(re.search('UseCustomDnsServer(.*?)\x0c', data).group()[19:-1])]
p_data['PrimaryDNSServer']= re.search('PrimaryDnsServer\x0c(.*?)\x0c', data).group()[18:-1]
p_data['BackupDNSServer'] = re.search('BackupDnsServer\x0c(.*?)(\x04|\x0c)', data).group()[16:-1]
except:
pass
return p_data
def calculate(self):
if not has_yara:
debug.error('Yara must be installed for this plugin.')
addr_space = utils.load_as(self._config)
os, memory_model = self.is_valid_profile(addr_space.profile)
if not os:
debug.error('This command does not support the selected profile.')
rules = yara.compile(sources=nanocore_sig)
for task in self.filter_tasks(tasks.pslist(addr_space)):
scanner = malfind.VadYaraScanner(task=task, rules=rules)
for hit, address in scanner.scan():
vad_base_addr, end = self.get_vad_base(task, address)
proc_addr_space = task.get_process_address_space()
memdata = proc_addr_space.get_available_addresses()
config_data = []
for m in memdata:
if m[1] < 0x100000:
continue
data = proc_addr_space.zread(m[0], m[1])
for pattern in CONFIG_PATTERNS:
m = re.search(pattern, data)
if m:
offset = m.start()
else:
continue
config_data.append(self.parse_config(data[offset: offset + 0x1000]))
yield task, vad_base_addr, end, hit, memory_model, config_data
break
def render_text(self, outfd, data):
delim = '-' * 70
for task, start, end, malname, memory_model, config_data in data:
outfd.write("{0}\n".format(delim))
outfd.write("Process: {0} ({1})\n\n".format(task.ImageFileName, task.UniqueProcessId))
outfd.write("[Config Info]\n")
for p_data in config_data:
for id, param in p_data.items():
outfd.write("{0:<20}: {1}\n".format(id, param))
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