File size: 4,921 Bytes
8377638 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 |
# Detecting ELF_Wellmess 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_wellmessconfig.py volatility/plugins/malware
# 3. python vol.py elf_wellmessconfig -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_wellmess_sig = {
'namespace1' : 'rule elf_wellmess { \
strings: \
$botlib1 = "botlib.wellMess" ascii\
$botlib2 = "botlib.Command" ascii\
$botlib3 = "botlib.Download" ascii\
$botlib4 = "botlib.AES_Encrypt" ascii\
condition: (uint32(0) == 0x464C457F) and all of ($botlib*)}'
}
# Config pattern
CONFIG_PATTERNS = [re.compile("\x00(.)\x00\x00\x00\x8B\x05...\x00\x85\xC0\x0F\x85..\x00\x00\x8D\x05(....)\x89\x05...\x00\xC7\x05", re.DOTALL),
re.compile("\x00(.)\x00\x00\x00\x8B\x05...\x00\x85\xC0\x0F\x85..\x00\x00\x48\x8D\x05(....)\x48\x89\x05...\x00\x48\xC7\x05", re.DOTALL)]
class elf_wellmessConfig(linux_pslist.linux_pslist):
"Parse the ELF_Wellmess 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 parse_config(self, config):
p_data = OrderedDict()
for i, d in enumerate(config):
p_data["conf " + str(i)] = d
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_wellmess_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 = []
configs = []
for pattern in CONFIG_PATTERNS:
mc = list(re.finditer(pattern, data))
if mc:
for m in mc:
hit_adderss = m.span()
config_rva = unpack("=I", m.groups()[1])[0]
if ord(data[0x4]) == 0x2: # for 64bit
config_offset = config_rva + hit_adderss[0] + 26
else: # for 32bit
config_offset = config_rva - 0x40000
configs.append(data[config_offset:config_offset + ord(m.groups()[0])])
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))
|