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# Detecting ELF_PLEAD for Volatilitv
#
# LICENSE
# Please refer to the LICENSE.txt in the https://github.com/JPCERTCC/MalConfScan/
#
# How to use:
# 1. cd "Volatility Folder"
# 2. mv elf_pleadconfig.py volatility/plugins/malware
# 3. python vol.py elf_pleadconfig -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 volatility.plugins.linux.pslist as linux_pslist
import volatility.plugins.linux.linux_yarascan as linux_yarascan
import re
import io
from struct import unpack, unpack_from
from collections import OrderedDict
try:
import yara
has_yara = True
except ImportError:
has_yara = False
elf_plead_sig = {
'namespace1' : 'rule elf_plead { \
strings: \
$ioctl = "ioctl TIOCSWINSZ error" \
$class1 = "CPortForwardManager" \
$class2 = "CRemoteShell" \
$class3 = "CFileManager" \
$lzo = { 81 ?? FF 07 00 00 81 ?? 1F 20 00 00 } \
condition: 3 of them}'
}
# Config pattern
CONFIG_PATTERNS = [re.compile("\xBA(...)\x00\xB9\xAA\x01\x00\x00\xBE\x20\x00\x00\x00\xBF(...)\x00", re.DOTALL)]
CONFIG_SIZE = 0x1AA
KEY_SIZE = 0x20
class elf_pleadConfig(linux_pslist.linux_pslist):
"Parse the ELF_PLEAD configuration"
@staticmethod
def is_valid_profile(profile):
return profile.metadata.get('os', 'unknown'), profile.metadata.get('memory_model', '32bit')
def get_vma_base(self, task, address):
for vma in task.get_proc_maps():
if address >= vma.vm_start and address < vma.vm_end:
return vma.vm_start, vma.vm_end
return None
def filter_tasks(self):
tasks = linux_pslist.linux_pslist(self._config).calculate()
if self._config.PID is not None:
try:
pidlist = [int(p) for p in self._config.PID.split(',')]
except ValueError:
debug.error("Invalid PID {0}".format(self._config.PID))
pids = [t for t in tasks if t.pid in pidlist]
if len(pids) == 0:
debug.error("Cannot find PID {0}. If its terminated or unlinked, use psscan and then supply --offset=OFFSET".format(self._config.PID))
return pids
return tasks
def rc4(self, data, key):
x = 0
box = range(256)
for i in range(256):
x = (x + box[i] + ord(key[i % len(key)])) % 256
box[i], box[x] = box[x], box[i]
x = 0
y = 0
out = []
for char in data:
x = (x + 1) % 256
y = (y + box[x]) % 256
box[x], box[y] = box[y], box[x]
out.append(chr(ord(char) ^ box[(box[x] + box[y]) % 256]))
return ''.join(out)
def parse_config(self, data, start, memory_model):
p_data = OrderedDict()
for pattern in CONFIG_PATTERNS:
if "64" in memory_model:
data_base_address = unpack("=Q", data[0x90:0x98])[0] - unpack("=Q", data[0x80:0x88])[0]
else:
data_base_address = unpack("=I", data[0x60:0x64])[0] - unpack("=I", data[0x58:0x5C])[0]
mc = re.search(pattern, data)
if mc:
config_offset = mc.start(1)
config_address = unpack("=I", data[config_offset:config_offset + 4])[0] - data_base_address
enc_config = data[config_address:config_address + CONFIG_SIZE]
key_offset = mc.start(2)
key_address = unpack("=I", data[key_offset:key_offset + 4])[0] - data_base_address
key = data[key_address:key_address + KEY_SIZE]
if enc_config[0] == "\x00":
print("[!] Config area is brank.")
else:
config = self.rc4(enc_config, key)
p_data["ID"] = unpack_from("<8s", config, 0)[0].replace("\0", "")
p_data["Unknown1"] = u"0x{0:X}".format(unpack_from("=Q", config, 0x8)[0])
p_data["Unknown2"] = u"0x{0:X}".format(unpack_from("=Q", config, 0x10)[0])
p_data["Unknown3"] = u"0x{0:X}".format(unpack_from("=Q", config, 0x18)[0])
p_data["Port1"] = unpack_from("<H", config, 0x20)[0]
p_data["Port2"] = unpack_from("<H", config, 0x22)[0]
p_data["Server"] = unpack_from("<384s", config, 0x26)[0].replace("\0", "")
p_data["Key"] = u"0x{0:X}".format(unpack_from(">I", config, 0x1A6)[0])
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=elf_plead_sig)
for task in self.filter_tasks():
scanner = linux_yarascan.VmaYaraScanner(task = task, rules = rules)
for hit, address in scanner.scan():
start, end = self.get_vma_base(task, address)
data = scanner.address_space.zread(start, (end - start) * 2)
#data = scanner.address_space.zread(address - self._config.REVERSE, self._config.SIZE)
config_data = []
config_data.append(self.parse_config(data, start, memory_model))
yield task, start, 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.comm, task.pid))
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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