def __EGG_Header__(self, data):
try:
# magic = struct.unpack('<L', data[0:4])[0]
magic = kavutil.get_uint32(data, 0)
if magic != 0x41474745:
raise SystemError
# version = struct.unpack('<H', data[4:6])[0]
version = kavutil.get_uint16(data, 4)
if version != 0x0100:
raise SystemError
# header_id = struct.unpack('<L', data[6:10])[0]
header_id = kavutil.get_uint32(data, 6)
if header_id == 0:
raise SystemError
# reserved = struct.unpack('<L', data[10:14])[0]
reserved = kavutil.get_uint32(data, 10)
if reserved != 0:
raise SystemError
return 0
except SystemError:
pass
return -1
def unarc(self, arc_engine_id, arc_name, fname_in_arc):
if arc_engine_id == 'arc_icon':
mm = self.__get_handle(arc_name)
num = kavutil.get_uint16(mm, 4)
p = p_name.search(fname_in_arc)
if p:
fw = int(p.groups()[0])
fh = int(p.groups()[1])
# fc = int(p.groups()[2])
for i in range(num):
off = 6 + (16 * i)
w = ord(mm[off])
h = ord(mm[off + 1])
# c = kavutil.get_uint16(mm, off+6)
if w == fw and h == fh: # and c == fc:
img_size = kavutil.get_uint32(mm, off + 8)
img_off = kavutil.get_uint32(mm, off + 12)
data = mm[img_off:img_off + img_size]
return data
return None
def __EGG_Header__(self, data):
try:
# magic = struct.unpack('<L', data[0:4])[0]
magic = kavutil.get_uint32(data, 0)
if magic != 0x41474745:
raise SystemError
# version = struct.unpack('<H', data[4:6])[0]
version = kavutil.get_uint16(data, 4)
if version != 0x0100:
raise SystemError
# header_id = struct.unpack('<L', data[6:10])[0]
header_id = kavutil.get_uint32(data, 6)
if header_id == 0:
raise SystemError
# reserved = struct.unpack('<L', data[10:14])[0]
reserved = kavutil.get_uint32(data, 10)
if reserved != 0:
raise SystemError
return 0
except SystemError:
pass
return -1
def __EGG_Dummy_Header_Size__(self, data):
try:
# dummy__size = struct.unpack('<H', data[5:7])[0]
dummy__size = kavutil.get_uint16(data, 5)
return 7 + dummy__size # (5 + 2 + dummy__size)
except:
pass
return -1
def __EGG_Dummy_Header_Size__(self, data):
try:
# dummy__size = struct.unpack('<H', data[5:7])[0]
dummy__size = kavutil.get_uint16(data, 5)
return 7 + dummy__size # (5 + 2 + dummy__size)
except:
pass
return -1
def format(self, filehandle, filename, filename_ex):
ret = {}
mm = filehandle
if mm[0:4] == '\x00\x00\x01\x00': # 헤더 체크
ret['ff_icon'] = kavutil.get_uint16(mm, 4)
return ret
return None
def __Alz_LocalFileHeader__(self, data):
try:
fname_size = kavutil.get_uint16(data, 4)
file_desc = ord(data[11])
compress__method__m = ord(data[13])
size = 19
if file_desc & 0x10:
compress__size = ord(data[size])
uncompress__size = ord(data[size + 1])
size += (1 * 2) # 파일 크기가 2개 옴(압축전, 압축 후)
elif file_desc & 0x20:
compress__size = kavutil.get_uint16(data, size)
uncompress__size = kavutil.get_uint16(data, size + 2)
size += (2 * 2)
elif file_desc & 0x40:
compress__size = kavutil.get_uint32(data, size)
uncompress__size = kavutil.get_uint32(data, size + 4)
size += (4 * 2)
elif file_desc & 0x80:
compress__size = kavutil.get_uint64(data, size)
uncompress__size = kavutil.get_uint64(data, size + 8)
size += (8 * 2)
else:
raise SystemError
fname = data[size:size + fname_size]
size += fname_size # 파일 이름
if file_desc & 1:
size += 12 # Encrypt Block
compressed__data = data[size:size + compress__size]
return compressed__data, compress__method__m, size + compress__size, fname
except IndexError:
pass
return None, -1
def __EGG_Filename_Header__(self, data):
size = -1
fname = None
try:
# fname_size = struct.unpack('<H', data[5:7])[0]
fname_size = kavutil.get_uint16(data, 5)
fname = data[7:7 + fname_size]
size = 7 + fname_size
except:
pass
return size, fname
def __Alz_LocalFileHeader__(self, data):
try:
fname_size = kavutil.get_uint16(data, 4)
file_desc = ord(data[11])
compress__method__m = ord(data[13])
size = 19
if file_desc & 0x10:
compress__size = ord(data[size])
uncompress__size = ord(data[size + 1])
size += (1 * 2) # 파일 크기가 2개 옴(압축전, 압축 후)
elif file_desc & 0x20:
compress__size = kavutil.get_uint16(data, size)
uncompress__size = kavutil.get_uint16(data, size+2)
size += (2 * 2)
elif file_desc & 0x40:
compress__size = kavutil.get_uint32(data, size)
uncompress__size = kavutil.get_uint32(data, size+4)
size += (4 * 2)
elif file_desc & 0x80:
compress__size = kavutil.get_uint64(data, size)
uncompress__size = kavutil.get_uint64(data, size+8)
size += (8 * 2)
else:
raise SystemError
fname = data[size:size + fname_size]
size += fname_size # 파일 이름
if file_desc & 1:
size += 12 # Encrypt Block
compressed__data = data[size:size + compress__size]
return compressed__data, compress__method__m, size+compress__size, fname
except IndexError:
pass
return None, -1
def __EGG_Filename_Header__(self, data):
size = -1
fname = None
try:
# fname_size = struct.unpack('<H', data[5:7])[0]
fname_size = kavutil.get_uint16(data, 5)
fname = data[7:7+fname_size]
size = 7 + fname_size
except:
pass
fsencoding = sys.getfilesystemencoding() or sys.getdefaultencoding()
return size, fname.decode('utf-8').encode(fsencoding)
def __EGG_Filename_Header__(self, data):
size = -1
fname = None
try:
# fname_size = struct.unpack('<H', data[5:7])[0]
fname_size = kavutil.get_uint16(data, 5)
fname = data[7:7 + fname_size]
size = 7 + fname_size
except:
pass
fsencoding = sys.getfilesystemencoding() or sys.getdefaultencoding()
return size, fname.decode('utf-8').encode(fsencoding)
def arclist(self, filename, fileformat):
file_scan_list = [] # 검사 대상 정보를 모두 가짐
# 미리 분석된 파일 포맷중에 ICON 포맷이 있는가?
if 'ff_icon' in fileformat:
num = fileformat['ff_icon']
mm = self.__get_handle(filename)
for i in range(num):
off = 6 + (16 * i)
w = ord(mm[off])
h = ord(mm[off + 1])
c = kavutil.get_uint16(mm, off + 6)
# name = '%dx%d %d bit' % (w, h, c)
name = '%dx%d' % (w, h)
file_scan_list.append(['arc_icon', name])
return file_scan_list
def checkpe(dst, dsize, pehdr):
try:
if kavutil.get_uint32(dst, pehdr) != 0x4550:
raise SystemError
valign = kavutil.get_uint32(dst, pehdr + 0x38)
if not valign:
raise SystemError
sectcnt = kavutil.get_uint16(dst, pehdr + 6)
if not sectcnt:
raise SystemError
sections_pos = pehdr + 0xF8
if (sections_pos + (sectcnt * 0x28)) > dsize:
raise SystemError
except:
sections_pos = 0
valign = 0
sectcnt = 0
pass
return sections_pos, valign, sectcnt
def checkpe(dst, dsize, pehdr):
try:
if kavutil.get_uint32(dst, pehdr) != 0x4550:
raise SystemError
valign = kavutil.get_uint32(dst, pehdr + 0x38)
if not valign:
raise SystemError
sectcnt = kavutil.get_uint16(dst, pehdr + 6)
if not sectcnt:
raise SystemError
sections_pos = pehdr + 0xF8
if (sections_pos + (sectcnt * 0x28)) > dsize:
raise SystemError
except:
sections_pos = 0
valign = 0
sectcnt = 0
pass
return sections_pos, valign, sectcnt
def parse(self):
mm = self.mm
pe_format = {
'PE_Position': 0,
'EntryPoint': 0,
'SectionNumber': 0,
'Sections': None,
'EntryPointRaw': 0,
'FileAlignment': 0
}
try:
if mm[0:2] != 'MZ': # MZ로 시작하나?
raise ValueError
# PE 표식자 위치 알아내기
pe_pos = kavutil.get_uint32(mm, 0x3C)
# PE 인가?
if mm[pe_pos:pe_pos + 4] != 'PE\x00\x00':
raise ValueError
pe_format['PE_Position'] = pe_pos
# Optional Header의 Magic ID?
if mm[pe_pos + 0x18:pe_pos + 0x18 + 2] != '\x0B\x01':
raise ValueError
# Entry Point 구하기
pe_ep = kavutil.get_uint32(mm, pe_pos + 0x28)
pe_format['EntryPoint'] = pe_ep
# Image Base 구하기
pe_img = kavutil.get_uint32(mm, pe_pos + 0x34)
pe_format['ImageBase'] = pe_img
# File Alignment 구하기
self.pe_file_align = kavutil.get_uint32(mm, pe_pos + 0x3C)
pe_format['FileAlignment'] = self.pe_file_align
# Section 개수 구하기
section_num = kavutil.get_uint16(mm, pe_pos + 0x6)
pe_format['SectionNumber'] = section_num
# Optional Header 크기 구하기
opthdr_size = kavutil.get_uint16(mm, pe_pos + 0x14)
pe_format['OptionalHederSize'] = opthdr_size
# t섹션 시작 위치
section_pos = pe_pos + 0x18 + opthdr_size
# 모든 섹션 정보 추출
for i in range(section_num):
section = {}
s = section_pos + (0x28 * i)
section['Name'] = mm[s:s + 8].replace('\x00', '')
section['VirtualSize'] = kavutil.get_uint32(mm, s + 8)
section['RVA'] = kavutil.get_uint32(mm, s + 12)
section['SizeRawData'] = kavutil.get_uint32(mm, s + 16)
section['PointerRawData'] = kavutil.get_uint32(mm, s + 20)
section['Characteristics'] = kavutil.get_uint32(mm, s + 36)
self.sections.append(section)
pe_format['Sections'] = self.sections
# EntryPoint의 파일에서의 위치 구하기
ep_raw, sec_idx = self.rva_to_off(pe_ep)
pe_format['EntryPointRaw'] = ep_raw # EP의 Raw 위치
pe_format['EntryPoint_in_Section'] = sec_idx # EP가 포함된 섹션
# 리소스 분석
rsrc_rva = kavutil.get_uint32(mm, pe_pos + 0x88) # 리소스 위치(RVA)
rsrc_size = kavutil.get_uint32(mm, pe_pos + 0x8C) # 리소스 크기
if rsrc_rva: # 리소스가 존재한가?
try:
rsrc_off, _ = self.rva_to_off(rsrc_rva) # 리소스 위치 변환
# Type 체크
num_type_name = kavutil.get_uint16(mm, rsrc_off + 0xC)
num_type_id = kavutil.get_uint16(mm, rsrc_off + 0xE)
for i in range(num_type_name + num_type_id):
type_id = kavutil.get_uint32(mm,
rsrc_off + 0x10 + (i * 8))
name_id_off = kavutil.get_uint32(
mm, rsrc_off + 0x14 + (i * 8))
# Type이 사용자가 정의한 이름 or RCDATA?
if type_id & 0x80000000 == 0x80000000 or type_id == 0xA:
if type_id & 0x80000000 == 0x80000000:
# 사용자가 정의한 이름 추출
string_off = (type_id & 0x7FFFFFFF) + rsrc_off
len_name = kavutil.get_uint16(mm, string_off)
rsrc_type_name = mm[string_off + 2:string_off +
2 + (len_name * 2):2]
else:
rsrc_type_name = 'RCDATA'
# Name ID
name_id_off = (name_id_off & 0x7FFFFFFF) + rsrc_off
num_name_id_name = kavutil.get_uint16(
mm, name_id_off + 0xC)
num_name_id_id = kavutil.get_uint16(
mm, name_id_off + 0xE)
for j in range(num_name_id_name + num_name_id_id):
name_id_id = kavutil.get_uint32(
mm, name_id_off + 0x10 + (j * 8))
language_off = kavutil.get_uint32(
mm, name_id_off + 0x14 + (j * 8))
# 리소스 영역의 최종 이름 생성
if name_id_id & 0x80000000 == 0x80000000:
string_off = (name_id_id
& 0x7FFFFFFF) + rsrc_off
len_name = kavutil.get_uint16(
mm, string_off)
rsrc_name_id_name = mm[string_off +
2:string_off + 2 +
(len_name * 2):2]
string_name = rsrc_type_name + '/' + rsrc_name_id_name
else:
string_name = rsrc_type_name + '/' + hex(
name_id_id).upper()[2:]
# Language
language_off = (language_off
& 0x7FFFFFFF) + rsrc_off
num_language_name = kavutil.get_uint16(
mm, language_off + 0xC)
num_language_id = kavutil.get_uint16(
mm, language_off + 0xE)
for k in range(num_language_name +
num_language_id):
# language_id = kavutil.get_uint32(mm, language_off + 0x10 + (k * 8))
data_entry_off = kavutil.get_uint32(
mm, language_off + 0x14 + (k * 8))
data_entry_off = (data_entry_off
& 0x7FFFFFFF) + rsrc_off
data_rva = kavutil.get_uint32(
mm, data_entry_off)
data_off, _ = self.rva_to_off(data_rva)
data_size = kavutil.get_uint32(
mm, data_entry_off + 4)
if data_size > 8192: # 최소 8K 이상인 리소스만 데이터로 추출
if 'Resource_UserData' in pe_format:
pe_format['Resource_UserData'][
string_name] = (data_off,
data_size)
else:
pe_format['Resource_UserData'] = {
string_name:
(data_off, data_size)
}
except struct.error:
pass
# if 'Resource_UserData' in pe_format:
# print pe_format['Resource_UserData']
# Import API 분석
imp_rva = kavutil.get_uint32(mm,
pe_pos + 0x80) # Import API 위치(RVA)
imp_size = kavutil.get_uint32(mm, pe_pos + 0x84) # Import API 크기
if imp_rva: # Import API 존재
imp_api = {}
# print 'IMP : %08X' % imp_rva
imp_off = self.rva_to_off(imp_rva)[0]
# print hex(imp_off), imp_size
imp_data = mm[imp_off:imp_off + imp_size]
for i in range(imp_size / 0x14): # DLL 정보 크기가 0x14
try:
dll_rva = kavutil.get_uint32(imp_data,
(i * 0x14) + 0xC)
api_rva = kavutil.get_uint32(imp_data, (i * 0x14))
bo = 2
if api_rva == 0:
api_rva = kavutil.get_uint32(
imp_data, (i * 0x14) + 0x10)
bo = 0
# print hex(api_rva)
if dll_rva == 0: # DLL 정보가 없음
break
t_off = self.rva_to_off(dll_rva)[0]
dll_name = p_str.search(mm[t_off:t_off + 0x20]).group()
# print '[+]', dll_name
imp_api[dll_name] = []
t_off = self.rva_to_off(api_rva)[0]
while True:
try:
api_name_rva = kavutil.get_uint32(mm, t_off)
except struct.error:
break
if api_name_rva & 0x80000000 == 0x80000000: # Odinal API
t_off += 4
continue
if api_name_rva == 0:
break
t = self.rva_to_off(api_name_rva)[0]
# print hex(t_off), hex(t)
api_name = p_str.search(mm[t + bo:t + bo +
0x20]).group()
# print ' ', api_name
imp_api[dll_name].append(api_name)
t_off += 4
except struct.error:
pass
pe_format['Import_API'] = imp_api
# 디지털 인증서 분석
cert_off = kavutil.get_uint32(mm, pe_pos +
0x98) # 디지털 인증서 위치(유일하게 RVA가 아닌 오프셋)
cert_size = kavutil.get_uint32(mm, pe_pos + 0x9C) # 디지털 인증서 크기
if cert_off: # 디지털 인증서 존재
if cert_off + cert_size <= len(mm[:]): # UPack의 경우 이상한 값이 셋팅 됨
pe_format['CERTIFICATE_Offset'] = cert_off
pe_format['CERTIFICATE_Size'] = cert_size
if self.verbose:
print '-' * 79
kavutil.vprint('Engine')
kavutil.vprint(None, 'Engine', 'pe.kmd')
kavutil.vprint(None, 'File name',
os.path.split(self.filename)[-1])
kavutil.vprint(None, 'MD5', cryptolib.md5(mm[:]))
print
kavutil.vprint('PE')
kavutil.vprint(None, 'EntryPoint',
'%08X' % pe_format['EntryPoint'])
kavutil.vprint(None, 'EntryPoint (Section)',
'%d' % pe_format['EntryPoint_in_Section'])
# 섹션 보기
if section_num:
print
kavutil.vprint('Section Header')
print ' %-8s %-8s %-8s %-8s %-8s %-8s' % (
'Name', 'VOFF', 'VSIZE', 'FOFF', 'FSIZE', 'EXEC')
print ' ' + ('-' * (9 * 6 - 1))
for s in self.sections:
print ' %-8s %08X %08X %08X %08X %-05s' % (
s['Name'], s['RVA'], s['VirtualSize'],
s['PointerRawData'], s['SizeRawData'],
s['Characteristics'] & 0x20000000 == 0x20000000)
if section_num:
print
kavutil.vprint('Section MD5')
print ' %-8s %-8s %-32s' % ('Name', 'FSIZE', 'MD5')
print ' ' + ('-' * ((9 * 2 - 1) + 32))
for s in self.sections:
if s['Characteristics'] & 0x20000000 == 0x20000000:
off = s['PointerRawData']
size = s['SizeRawData']
fmd5 = cryptolib.md5(mm[off:off + size])
print ' %-8s %8d %s' % (s['Name'], size, fmd5)
print
kavutil.vprint('Entry Point (Raw)')
print
kavutil.HexDump().Buffer(mm[:], pe_format['EntryPointRaw'],
0x80)
print
except ValueError:
return None
return pe_format
def __scan_asn1(self, filehandle, filename, fileformat, filename_ex):
mm = filehandle
ff = fileformat['ff_pe']
cert_off = ff['pe'].get('CERTIFICATE_Offset', 0)
cert_size = ff['pe'].get('CERTIFICATE_Size', 0)
if cert_off != 0 and cert_size != 0:
if self.verbose:
print '-' * 79
kavutil.vprint('Engine')
kavutil.vprint(None, 'Engine', 'adware.kmd')
# 인증서 추출
cert_data = mm[cert_off:cert_off + cert_size]
asn1 = ASN1()
asn1.set_data(cert_data[8:])
try:
r = asn1.parse()
# Signed Data 이면서 버전 정보가 1인가?
if r[0][0] == '2A 86 48 86 F7 0D 01 07 02' and r[0][1][0][
0] == '01':
signeddata = r[0][1][0]
certificates = signeddata[3]
signerinfo = r[0][1][0][-1]
issuer_and_serialnumber = signerinfo[0][1]
issuer_serial = issuer_and_serialnumber[1]
for cert in certificates:
if cert[0][1] == issuer_serial: # 동일한 일련번호 찾기
for x in cert[0][5]:
if x[0][0] == '55 04 03': # Common Name
signer_name = x[0][1]
break
else:
continue # no break encountered
break
else:
raise IndexError
# 일련번호의 길이가 제각각이라 md5 고정길이로 만듬
fmd5 = cryptolib.md5(issuer_serial)
fsize = kavutil.get_uint16(fmd5.decode('hex'), 0)
if self.verbose:
kavutil.vprint('Signer')
kavutil.vprint(None, 'Name', signer_name)
kavutil.vprint(None, 'Serial Number', issuer_serial)
msg = '%d:%s: # %s, %s\n' % (fsize, fmd5, signer_name,
cryptolib.sha256(mm))
open('adware.mdb', 'at').write(msg)
if fsize and kavutil.handle_pattern_md5.match_size(
'adware', fsize):
vname = kavutil.handle_pattern_md5.scan(
'adware', fsize, fmd5)
if vname:
pos = ff['pe'].get('EntryPointRaw', 0)
if mm[pos:pos + 4] == '\xff\x25\x00\x20':
pf = 'MSIL'
else:
pf = 'Win32'
vname = kavutil.normal_vname(vname, pf)
return True, vname, 0, kernel.INFECTED
except IndexError:
pass
# 악성코드를 발견하지 못했음을 리턴한다.
return False, '', -1, kernel.NOT_FOUND
def parse(self):
mm = self.mm
pe_format = {'PE_Position': 0, 'EntryPoint': 0, 'SectionNumber': 0,
'Sections': None, 'EntryPointRaw': 0, 'FileAlignment': 0}
try:
if mm[0:2] != 'MZ': # MZ로 시작하나?
raise ValueError
dos_header = DOS_HEADER()
ctypes.memmove(ctypes.addressof(dos_header), mm[0:], ctypes.sizeof(dos_header))
# PE 표식자 위치 알아내기
pe_pos = dos_header.e_lfanew
# PE 인가?
if mm[pe_pos:pe_pos + 4] != 'PE\x00\x00':
raise ValueError
pe_format['PE_Position'] = pe_pos
# File Header 읽기
file_header = FILE_HEADER()
file_header_size = ctypes.sizeof(file_header) # file_header_size : 0x14
ctypes.memmove(ctypes.addressof(file_header), mm[pe_pos + 4:], file_header_size)
# Optional Header 읽기
optional_header = OPTIONAL_HEADER()
optional_header_size = ctypes.sizeof(optional_header)
ctypes.memmove(ctypes.addressof(optional_header), mm[pe_pos + 4 + file_header_size:], optional_header_size)
# Optional Header의 Magic ID?
if optional_header.Magic != 0x10b:
raise ValueError
# Entry Point 구하기
pe_ep = optional_header.AddressOfEntryPoint
pe_format['EntryPoint'] = pe_ep
# Image Base 구하기
pe_img = optional_header.ImageBase
pe_format['ImageBase'] = pe_img
# File Alignment 구하기
self.pe_file_align = optional_header.FileAlignment
pe_format['FileAlignment'] = self.pe_file_align
# Section 개수 구하기
section_num = file_header.NumberOfSections
pe_format['SectionNumber'] = section_num
# Optional Header 크기 구하기
opthdr_size = file_header.SizeOfOptionalHeader
pe_format['OptionalHederSize'] = opthdr_size
# Data Directory 읽기
data_directory_size = ctypes.sizeof(DATA_DIRECTORY()) # data_directory_size : 8
num_data_directory = (opthdr_size - optional_header_size) / data_directory_size
off_data_directory = pe_pos + 4 + file_header_size + optional_header_size
for i in range(num_data_directory):
dx = DATA_DIRECTORY()
ctypes.memmove(ctypes.addressof(dx),
mm[off_data_directory + (i * data_directory_size):],
data_directory_size)
self.data_directories.append(dx)
# 섹션 시작 위치
section_pos = pe_pos + 4 + file_header_size + opthdr_size
# 모든 섹션 정보 추출
for i in range(section_num):
section = {}
section_header = SECTION_HEADER()
section_header_size = ctypes.sizeof(section_header) # section_header_size : 0x28
s = section_pos + (section_header_size * i)
ctypes.memmove(ctypes.addressof(section_header), mm[s:], section_header_size)
sec_name = ctypes.cast(section_header.Name, ctypes.c_char_p)
section['Name'] = sec_name.value.replace('\x00', '')
section['VirtualSize'] = section_header.Misc_VirtualSize
section['RVA'] = section_header.VirtualAddress
section['SizeRawData'] = section_header.SizeOfRawData
section['PointerRawData'] = section_header.PointerToRawData
section['Characteristics'] = section_header.Characteristics
self.sections.append(section)
pe_format['Sections'] = self.sections
# EntryPoint의 파일에서의 위치 구하기
ep_raw, sec_idx = self.rva_to_off(pe_ep)
pe_format['EntryPointRaw'] = ep_raw # EP의 Raw 위치
pe_format['EntryPoint_in_Section'] = sec_idx # EP가 포함된 섹션
# 리소스 분석
try:
rsrc_rva = self.data_directories[image_directory_entry.RESOURCE].VirtualAddress # 리소스 위치(RVA)
rsrc_size = self.data_directories[image_directory_entry.RESOURCE].Size # 리소스 크기
except IndexError:
rsrc_rva = 0
rsrc_size = 0
if rsrc_rva: # 리소스가 존재한가?
try:
rsrc_off, rsrc_idx = self.rva_to_off(rsrc_rva) # 리소스 위치 변환
if rsrc_off > self.filesize:
raise ValueError
t_size = self.sections[rsrc_idx]['SizeRawData']
if not (len(mm[rsrc_off:rsrc_off + rsrc_size]) == rsrc_size or \
len(mm[rsrc_off:rsrc_off + t_size]) == t_size): # 충분한 리소스가 존재하지 않음
raise ValueError
# Type 체크
num_type_name = kavutil.get_uint16(mm, rsrc_off+0xC)
num_type_id = kavutil.get_uint16(mm, rsrc_off + 0xE)
for i in range(num_type_name + num_type_id):
type_id = kavutil.get_uint32(mm, rsrc_off + 0x10 + (i*8))
name_id_off = kavutil.get_uint32(mm, rsrc_off + 0x14 + (i * 8))
# Type이 사용자가 정의한 이름 or RCDATA?
if type_id & 0x80000000 == 0x80000000 or type_id == 0xA or type_id == 0:
if type_id & 0x80000000 == 0x80000000:
# 사용자가 정의한 이름 추출
string_off = (type_id & 0x7FFFFFFF) + rsrc_off
len_name = kavutil.get_uint16(mm, string_off)
rsrc_type_name = mm[string_off + 2:string_off + 2 + (len_name * 2):2]
elif type_id == 0xA:
rsrc_type_name = 'RCDATA'
else:
rsrc_type_name = '%d' % type_id
# Name ID
name_id_off = (name_id_off & 0x7FFFFFFF) + rsrc_off
if name_id_off > self.filesize:
raise ValueError
num_name_id_name = kavutil.get_uint16(mm, name_id_off + 0xC)
num_name_id_id = kavutil.get_uint16(mm, name_id_off + 0xE)
for j in range(num_name_id_name + num_name_id_id):
name_id_id = kavutil.get_uint32(mm, name_id_off + 0x10 + (j * 8))
language_off = kavutil.get_uint32(mm, name_id_off + 0x14 + (j * 8))
# 리소스 영역의 최종 이름 생성
if name_id_id & 0x80000000 == 0x80000000:
string_off = (name_id_id & 0x7FFFFFFF) + rsrc_off
if string_off > self.filesize:
raise ValueError
len_name = kavutil.get_uint16(mm, string_off)
rsrc_name_id_name = mm[string_off + 2:string_off + 2 + (len_name * 2):2]
string_name = rsrc_type_name + '/' + rsrc_name_id_name
else:
string_name = rsrc_type_name + '/' + hex(name_id_id).upper()[2:]
# Language
language_off = (language_off & 0x7FFFFFFF) + rsrc_off
if language_off > self.filesize:
raise ValueError
num_language_name = kavutil.get_uint16(mm, language_off + 0xC)
num_language_id = kavutil.get_uint16(mm, language_off + 0xE)
for k in range(num_language_name + num_language_id):
# language_id = kavutil.get_uint32(mm, language_off + 0x10 + (k * 8))
data_entry_off = kavutil.get_uint32(mm, language_off + 0x14 + (k * 8))
data_entry_off = (data_entry_off & 0x7FFFFFFF) + rsrc_off
data_rva = kavutil.get_uint32(mm, data_entry_off)
data_off, _ = self.rva_to_off(data_rva)
if data_off > self.filesize:
continue
data_size = kavutil.get_uint32(mm, data_entry_off + 4)
if data_size > self.filesize:
continue
if data_size > 8192: # 최소 8K 이상인 리소스만 데이터로 추출
if 'Resource_UserData' in pe_format:
pe_format['Resource_UserData'][string_name] = (data_off, data_size)
else:
pe_format['Resource_UserData'] = {string_name: (data_off, data_size)}
except (struct.error, ValueError) as e:
pass
# if 'Resource_UserData' in pe_format:
# print pe_format['Resource_UserData']
# Import API 분석
try:
imp_rva = self.data_directories[image_directory_entry.IMPORT].VirtualAddress # Import API 위치(RVA)
imp_size = self.data_directories[image_directory_entry.IMPORT].Size # Import API 크기
except IndexError:
imp_rva = 0
imp_size = 0
if imp_rva: # Import API 존재
imp_api = {}
# print 'IMP : %08X' % imp_rva
imp_off = self.rva_to_off(imp_rva)[0]
# print hex(imp_off), imp_size
imp_data = mm[imp_off:imp_off+imp_size]
if len(imp_data) == imp_size:
for i in range(imp_size / 0x14): # DLL 정보 크기가 0x14
try:
dll_rva = kavutil.get_uint32(imp_data, (i*0x14)+0xC)
api_rva = kavutil.get_uint32(imp_data, (i * 0x14))
bo = 2
if api_rva == 0:
api_rva = kavutil.get_uint32(imp_data, (i*0x14)+0x10)
bo = 0
# print hex(api_rva)
if dll_rva == 0: # DLL 정보가 없음
break
t_off = self.rva_to_off(dll_rva)[0]
dll_name = p_str.search(mm[t_off:t_off+0x20]).group()
# print '[+]', dll_name
imp_api[dll_name] = []
t_off = self.rva_to_off(api_rva)[0]
while True:
try:
api_name_rva = kavutil.get_uint32(mm, t_off)
except struct.error:
break
if api_name_rva & 0x80000000 == 0x80000000: # Odinal API
t_off += 4
continue
if api_name_rva == 0:
break
t = self.rva_to_off(api_name_rva)[0]
# print hex(t_off), hex(t)
api_name = p_str.search(mm[t+bo:t+bo+0x20]).group()
# print ' ', api_name
imp_api[dll_name].append(api_name)
t_off += 4
except struct.error:
pass
# end if
pe_format['Import_API'] = imp_api
# 디지털 인증서 분석
try:
cert_off = self.data_directories[image_directory_entry.SECURITY].VirtualAddress # 유일하게 RVA가 아닌 오프셋
cert_size = self.data_directories[image_directory_entry.SECURITY].Size # 디지털 인증서 크기
except IndexError:
cert_off = 0
cert_size = 0
if cert_off: # 디지털 인증서 존재
if cert_off + cert_size <= len(mm[:]): # UPack의 경우 이상한 값이 셋팅 됨
pe_format['CERTIFICATE_Offset'] = cert_off
pe_format['CERTIFICATE_Size'] = cert_size
# Debug 정보 분석
try:
debug_rva = self.data_directories[image_directory_entry.DEBUG].VirtualAddress # RVA
debug_size = self.data_directories[image_directory_entry.DEBUG].Size # 크기
if debug_size < 0x1C:
raise ValueError
except (IndexError, ValueError) as e:
debug_rva = 0
debug_size = 0
if debug_rva: # Debug 정보 존재
t = self.rva_to_off(debug_rva)[0]
debug_off = kavutil.get_uint32(mm, t + 0x18)
debug_size = kavutil.get_uint32(mm, t + 0x10)
debug_data = mm[debug_off:debug_off + debug_size]
if debug_data[:4] == 'RSDS':
pe_format['PDB_Name'] = debug_data[0x18:]
else:
pe_format['PDB_Name'] = 'Not support Type : %s' % debug_data[:4]
if self.verbose:
print '-' * 79
kavutil.vprint('Engine')
kavutil.vprint(None, 'Engine', 'pe.kmd')
kavutil.vprint(None, 'File name', os.path.split(self.filename)[-1])
kavutil.vprint(None, 'MD5', cryptolib.md5(mm[:]))
print
kavutil.vprint('PE')
kavutil.vprint(None, 'EntryPoint', '%08X' % pe_format['EntryPoint'])
kavutil.vprint(None, 'EntryPoint (Section)', '%d' % pe_format['EntryPoint_in_Section'])
# 섹션 보기
if section_num:
print
kavutil.vprint('Section Header')
print ' %-8s %-8s %-8s %-8s %-8s %-8s' % ('Name', 'VOFF', 'VSIZE', 'FOFF', 'FSIZE', 'EXEC')
print ' ' + ('-' * (9*6 - 1))
for s in self.sections:
print ' %-8s %08X %08X %08X %08X %-05s' % (s['Name'], s['RVA'], s['VirtualSize'],
s['PointerRawData'], s['SizeRawData'],
s['Characteristics'] & 0x20000000 == 0x20000000)
if section_num:
print
kavutil.vprint('Section MD5')
print ' %-8s %-8s %-32s' % ('Name', 'FSIZE', 'MD5')
print ' ' + ('-' * ((9 * 2 - 1)+32))
for s in self.sections:
# if s['Characteristics'] & 0x20000000 == 0x20000000:
off = s['PointerRawData']
size = s['SizeRawData']
fmd5 = cryptolib.md5(mm[off:off+size]) if size else '-'
print ' %-8s %8d %s' % (s['Name'], size, fmd5)
print
kavutil.vprint('Entry Point (Raw)')
print
kavutil.HexDump().Buffer(mm[:], pe_format['EntryPointRaw'], 0x80)
print
if 'PDB_Name' in pe_format:
kavutil.vprint('PDB Information')
kavutil.vprint(None, 'Name', '%s' % repr(pe_format['PDB_Name']))
print repr(pe_format['PDB_Name'])
print
except (ValueError, struct.error) as e:
return None
return pe_format
def scan(self, filehandle, filename, fileformat, filename_ex): # 악성코드 검사
try:
mm = filehandle
if mm[0:8] != '\x4c\x00\x00\x00\x01\x14\x02\x00': # LNK 헤더 체크
raise ValueError
flag = kavutil.get_uint32(mm, 0x14)
off = 0x4c
if flag & 0x0001 == 0x0001: # HasLinkTargetIDList
clid_mycom = '14001F50E04FD020EA3A6910A2D808002B30309D'.decode(
'hex')
if mm[off + 2:off + 2 + 0x14] != clid_mycom: # MyComputer
raise ValueError
off += 2
while True:
size = kavutil.get_uint16(mm, off)
if size == 0:
off += 2
break
if ord(mm[off + 2]) == 0x32:
if mm[off + 0xe:off + 0xe + 7].lower() != 'cmd.exe':
raise ValueError
off += size
if flag & 0x0002 == 0x0002: # HasLinkInfo
off += kavutil.get_uint16(mm, off)
if flag & 0x0004 == 0x0004: # HasName
size = kavutil.get_uint16(mm, off)
off += (2 + (size * 2))
if flag & 0x0008 == 0x0008: # HasRelativePath
size = kavutil.get_uint16(mm, off)
cmd_path = mm[off + 2:off + 2 + (size * 2):2].lower()
# print cmd_path
if cmd_path.find('cmd.exe') == -1:
raise ValueError
off += (2 + (size * 2))
if flag & 0x0010 == 0x0010: # HasWorkingDir
size = kavutil.get_uint16(mm, off)
off += (2 + (size * 2))
if flag & 0x0020 == 0x0020: # HasArguments
size = kavutil.get_uint16(mm, off)
cmd_arg = mm[off + 2:off + 2 + (size * 2):2].lower()
cmd_arg = cmd_arg.replace('^', '')
# print cmd_arg
# 악성코드 패턴을 비교한다.
if self.p_http.search(cmd_arg):
return True, 'Trojan.LNK.Agent.gen', 0, kernel.INFECTED
except (IOError, ValueError):
pass
# 악성코드를 발견하지 못했음을 리턴한다.
return False, '', -1, kernel.NOT_FOUND
def __scan_asn1(self, filehandle, filename, fileformat, filename_ex):
mm = filehandle
ff = fileformat['ff_pe']
cert_off = ff['pe'].get('CERTIFICATE_Offset', 0)
cert_size = ff['pe'].get('CERTIFICATE_Size', 0)
if cert_off != 0 and cert_size != 0:
if self.verbose:
print '-' * 79
kavutil.vprint('Engine')
kavutil.vprint(None, 'Engine', 'adware.kmd')
# 인증서 추출
cert_data = mm[cert_off:cert_off + cert_size]
asn1 = ASN1()
asn1.set_data(cert_data[8:])
try:
r = asn1.parse()
# Signed Data 이면서 버전 정보가 1인가?
if r[0][0] == '2A 86 48 86 F7 0D 01 07 02' and r[0][1][0][0] == '01':
signeddata = r[0][1][0]
certificates = signeddata[3]
signerinfo = r[0][1][0][-1]
issuer_and_serialnumber = signerinfo[0][1]
issuer_serial = issuer_and_serialnumber[1]
for cert in certificates:
if cert[0][1] == issuer_serial: # 동일한 일련번호 찾기
for x in cert[0][5]:
if x[0][0] == '55 04 03': # Common Name
signer_name = x[0][1]
break
else:
continue # no break encountered
break
else:
raise IndexError
# 일련번호의 길이가 제각각이라 md5 고정길이로 만듬
fmd5 = cryptolib.md5(issuer_serial)
fsize = kavutil.get_uint16(fmd5.decode('hex'), 0)
if self.verbose:
kavutil.vprint('Signer')
kavutil.vprint(None, 'Name', signer_name)
kavutil.vprint(None, 'Serial Number', issuer_serial)
msg = '%d:%s: # %s, %s\n' % (fsize, fmd5, signer_name, cryptolib.sha256(mm))
open('adware.mdb', 'at').write(msg)
if fsize and kavutil.handle_pattern_md5.match_size('adware', fsize):
vname = kavutil.handle_pattern_md5.scan('adware', fsize, fmd5)
if vname:
pos = ff['pe'].get('EntryPointRaw', 0)
if mm[pos:pos + 4] == '\xff\x25\x00\x20':
pf = 'MSIL'
else:
pf = 'Win32'
vname = kavutil.normal_vname(vname, pf)
return True, vname, 0, kernel.INFECTED
except IndexError:
pass
# 악성코드를 발견하지 못했음을 리턴한다.
return False, '', -1, kernel.NOT_FOUND
