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# Detecting Ramnit for Volatility
#
# LICENSE
# Please refer to the LICENSE.txt in the https://github.com/JPCERTCC/MalConfScan/
#
# How to use:
# 1. cd "Volatility Folder"
# 2. mv ramnitscan.py volatility/plugins/malware
# 3. python vol.py ramnitconfig -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
import pefile
from struct import unpack, unpack_from
from socket import inet_ntoa
from collections import OrderedDict
try:
import yara
has_yara = True
except ImportError:
has_yara = False
ramnit_sig = {
'namespace1' : 'rule Ramnit { \
strings: \
$guid = "{%08X-%04X-%04X-%04X-%08X%04X}" \
$md5_magic_1 = "15Bn99gT" \
$md5_magic_2 = "1E4hNy1O" \
$init_dga = { C7 ?? ?? ?? ?? ?? FF FF FF FF FF ?? ?? ?? ?? ?? FF ?? ?? ?? ?? ?? FF ?? ?? ?? ?? ?? E8 ?? ?? ?? ?? 0B C0 75 ?? } \
$xor_secret = { 8A ?? ?? 32 ?? 88 ?? 4? 4? E2 ?? } \
$init_function = { FF 35 [4] 68 [4] 68 [2] 00 00 68 [4] E8 [4] FF 35 [4] 68 [4] 68 [2] 00 00 68 [4] E8 [4] FF 35 [4] 68 [4] 68 [2] 00 00 68 [4] E8 [4] FF 35 [4] 68 [4] 68 [2] 00 00 68 [4] E8 } \
$dga_rand_int = { B9 1D F3 01 00 F7 F1 8B C8 B8 A7 41 00 00 } \
$cookies = "cookies4.dat" \
$s3 = "pdatesDisableNotify" \
$get_domains = { a3 [4] a1 [4] 80 3? 00 75 ?? c7 05 [4] ff ff ff ff ff 35 [4] ff 35 [4] ff 35 [4] e8 } \
$add_tld = { 55 8B EC 83 ?? ?? 57 C7 ?? ?? 00 00 00 00 B? ?? ?? ?? ?? 8B ?? ?? 3B ?? ?? 75 ?? 8B ?? } \
$get_port = { 90 68 [4] 68 [4] FF 35 [4] FF 35 [4] E8 [4] 83 } \
condition: $init_dga and $init_function and 2 of ($guid, $md5_magic_*, $cookies, $s3) and any of ( $get_port, $add_tld, $dga_rand_int, $get_domains, $xor_secret)}'
}
# MZ Header
MZ_HEADER = b"\x4D\x5A\x90\x00"
# XOR key pattern
XOR_KEY_PATTERNS = [re.compile("\x68\x3C\x01\x00\x00\x68\x20", re.DOTALL)]
# Flag
FLAG = {0x0: "Disable", 0x1: "Enable"}
class ramnitConfig(taskmods.DllList):
"""Parse the Ramnit 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 xor(self, encoded, xor_key):
count = 0
decode = []
key_len = len(xor_key)
for n in range(len(encoded)):
if count == 0:
count = key_len - 1
decode.append(chr(ord(encoded[n]) ^ ord(xor_key[count])))
count -= 1
return "".join(decode)
def parse_config(self, pe, data, base):
p_data = OrderedDict()
p_data["DGA Damain No"] = unpack_from("I", data, base)[0]
p_data["DGA Damain Seed"] = unpack_from(">I", data, base + 4)[0]
p_data["Magick Check"] = FLAG[unpack_from("I", data, base + 8)[0]]
p_data["Magick"] = unpack_from(">I", data, base + 0xc)[0]
p_data["Use IP Address"] = FLAG[unpack_from("I", data, base + 0x10)[0]]
p_data["IP Address"] = inet_ntoa(data[base + 0x14:base + 0x18])
p_data["Port"] = unpack_from("I", data, base + 0x18)[0]
key_len = unpack_from("I", data, base + 0x1c)[0]
p_data["XOR key length"] = key_len
for pattern in XOR_KEY_PATTERNS:
mk = re.search(pattern, data)
if mk:
(resource_name_rva, ) = unpack("=I", data[mk.start() - 4:mk.start()])
rn_addr = pe.get_physical_by_rva(resource_name_rva - pe.NT_HEADERS.OPTIONAL_HEADER.ImageBase)
xor_key = data[rn_addr:rn_addr + key_len]
else:
xor_key = ""
outfd.write("[!] Not found XOR key.\n")
domain_encoded_data = data[base + 0x20:base + 0x15c].replace("\0","")
botnet_encoded_data = data[base + 0x15c:base + 0x1ca].replace("\0","")
encoded_data_1 = data[base + 0x1ca:base + 0x240].replace("\0","")
encoded_data_2 = data[base + 0x240:base + 0x2b6].replace("\0","")
rc4_encoded_data = data[base + 0x2b6:base + 0x2f1].replace("\0","")
p_data["Hardcode Domain"] = self.xor(domain_encoded_data, xor_key)
p_data["Botnet name"] = self.xor(botnet_encoded_data, xor_key)
p_data["Unknown 1"] = self.xor(encoded_data_1, xor_key)
p_data["Unknown 2"] = self.xor(encoded_data_2, xor_key)
p_data["RC4 Key"] = self.xor(rc4_encoded_data, xor_key)
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=ramnit_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()
data = proc_addr_space.zread(vad_base_addr, end - vad_base_addr)
config_data = []
# resource PE search
dll_index = data.rfind(MZ_HEADER)
dll_data = data[dll_index:]
try:
pe = pefile.PE(data=dll_data)
except:
outfd.write("[!] Can't mapped PE.\n")
continue
for section in pe.sections:
if ".data" in section.Name:
data_address = section.PointerToRawData
config_data.append(self.parse_config(pe, dll_data, data_address))
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:<16}: {1}\n".format(id, param))
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