You can find the original analysis for this malware at malwarebytes. As a bonus, in the video we show how to improve the static analysis of the final payload by resolving API calls.
This script converts the decrypted blob hashes into a call index → api name dictionary.
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])
from Pro.Core import *
from Pro.PE import *
from Pro.ccast import *
ror = lambda val, r_bits, max_bits: \
((val & (2**max_bits-1)) >> r_bits%max_bits) | \
(val << (max_bits-(r_bits%max_bits)) & (2**max_bits-1))
def getAPIs(dllpath):
apis = {}
c = createContainerFromFile(dllpath)
dll = PEObject()
if not dll.Load(c):
print("error: couldn't load dll")
return apis
ordbase = dll.ExportDirectory().Num("Base")
functions = dll.ExportDirectoryFunctions()
names = dll.ExportDirectoryNames()
nameords = dll.ExportDirectoryNameOrdinals()
n = functions.Count()
it = functions.iterator()
for x in range(n):
func = it.next()
ep = func.Num(0)
if ep == 0:
continue
apiord = str(ordbase + x)
n2 = nameords.Count()
it2 = nameords.iterator()
name_found = False
for y in range(n2):
no = it2.next()
if no.Num(0) == x:
name = names.At(y)
offs = dll.RvaToOffset(name.Num(0))
name, ret = dll.ReadUInt8String(offs, 500)
apiname = name.decode("ascii")
apis[apiname] = apiord
apis[apiord] = apiname
name_found = True
break
if not name_found:
apis[apiord] = apiord
return apis
def hash(name):
x = 0
for c in name:
x = ror(x, 0xD, 32)
x += ord(c)
x = ror(x, 0xD, 32)
return x
def hashAPIs(apis):
hapis = {}
for i, name in apis.items():
hapis[hash(name)] = name
return hapis
def walkBlob():
i = 0
idxs = {}
pos = 0
while i < len(blob):
e = blob.find(b"\x00", i)
if i == e:
break
s = blob[i:e].decode("ascii")
i = e + 1
if "." in s:
dllname = s
apis = getAPIs("C:\\Windows\\System32\\" + dllname)
apis = hashAPIs(apis)
else:
x = dword(int(s))
apiname = apis[x]
idxs[pos] = apiname
pos += 0x10
print(apiname)
return idxs
idxs = walkBlob()
print(idxs) This script uses the index dictionary from the previous script to comment register-based call instructions in the disassembly with the resolved API name.
idxs = {0: 'VirtualAlloc', 16: 'Sleep', 32: 'CreateThread', 48: 'CloseHandle', 64: 'ReadFile', 80: 'CreateFileA', 96: 'WriteFile', 112: 'GetFileSize', 128: 'lstrlenA', 144: 'lstrlenW', 160: 'lstrcpyA', 176: 'lstrcpyW', 192: 'lstrcatA', 208: 'lstrcatW', 224: 'lstrcmpA', 240: 'lstrcmpW', 256: 'VirtualFree', 272: 'WaitForSingleObject', 288: 'TerminateThread', 304: 'GetTickCount', 320: 'FormatMessageA', 336: 'GetLastError', 352: 'EnterCriticalSection', 368: 'LeaveCriticalSection', 384: 'InitializeCriticalSection', 400: 'DeleteCriticalSection', 416: 'LocalFree', 432: 'MultiByteToWideChar', 448: 'WideCharToMultiByte', 464: 'GetComputerNameW', 480: 'GetModuleFileNameW', 496: 'GetCurrentProcessId', 512: 'GetLocalTime', 528: 'QueryPerformanceFrequency', 544: 'QueryPerformanceCounter', 560: 'IsWow64Process', 576: 'GetCurrentProcess', 592: 'GetVersionExA', 608: 'GlobalFree', 624: 'VirtualFreeEx', 640: 'DuplicateHandle', 656: 'DebugBreak', 672: 'CreateEventW', 688: 'DeviceIoControl', 704: 'DeleteFileA', 720: 'GetTempPathA', 736: 'GetTempFileNameA', 752: 'SetErrorMode', 768: 'FreeLibrary', 784: 'RtlGetNtVersionNumbers', 800: 'RtlNtStatusToDosError', 816: 'RtlDecompressBuffer', 832: 'RtlCompressBuffer', 848: 'RtlGetCompressionWorkSpaceSize', 864: 'NtQuerySystemInformation', 880: 'NtQueryObject', 896: 'PeekMessageW', 912: 'GetMessageW', 928: 'PostThreadMessageW', 944: 'send', 960: 'recv', 976: 'closesocket', 992: 'WSAStartup', 1008: 'socket', 1024: 'bind', 1040: 'listen', 1056: 'accept', 1072: 'connect', 1088: 'WSACleanup', 1104: 'inet_addr', 1120: 'inet_ntoa', 1136: 'htons', 1152: 'getaddrinfo', 1168: 'freeaddrinfo', 1184: 'WSAAddressToStringA', 1200: 'setsockopt', 1216: 'getsockopt', 1232: 'recvfrom', 1248: 'sendto', 1264: 'shutdown', 1280: 'WSAGetLastError', 1296: 'select', 1312: 'getpeername', 1328: 'CryptAcquireContextW', 1344: 'CryptDestroyHash', 1360: 'CryptCreateHash', 1376: 'CryptHashData', 1392: 'CryptGetHashParam', 1408: 'CryptDeriveKey', 1424: 'CryptEncrypt', 1440: 'CryptDecrypt', 1456: 'GetUserNameW', 1472: 'UuidCreate', 1488: 'WinHttpGetIEProxyConfigForCurrentUser', 1504: 'WinHttpOpen', 1520: 'WinHttpGetProxyForUrl', 1536: 'WinHttpCloseHandle', 1552: 'WinHttpConnect', 1568: 'WinHttpOpenRequest', 1584: 'WinHttpAddRequestHeaders', 1600: 'WinHttpSendRequest', 1616: 'WinHttpWriteData', 1632: 'WinHttpQueryDataAvailable', 1648: 'WinHttpQueryOption', 1664: 'WinHttpReceiveResponse', 1680: 'WinHttpReadData', 1696: 'WinHttpSetOption', 1712: 'WinHttpSetCredentials', 1728: 'WinHttpQueryAuthSchemes', 1744: 'GetAdaptersInfo', 1760: 'CryptBinaryToStringA', 1776: 'CryptStringToBinaryA', 1792: 'StrStrIA', 1808: 'URLDownloadToFileA', 1824: 'memset', 1840: 'memmove', 1856: 'memcpy', 1872: 'memcmp', 1888: '_wcsicmp', 1904: 'time', 1920: 'strstr', 1936: 'atoi', 1952: '_itow', 1968: 'srand', 1984: 'rand', 2000: '_wcsnicmp', 2016: 'sprintf', 2032: 'printf'}
from Pro.UI import proContext
from Pro.Carbon import *
from Pro.capstone import *
import re
def commentAPIs():
md = Cs(CS_ARCH_X86, CS_MODE_64)
v = proContext().getCurrentView()
ca = v.getCarbon()
db = ca.getDB()
e = caASEntry()
e.end = 0
while db.getNextASEntry(e.end, e):
if e.type_id != CarbonType_I_x64:
continue
buf = ca.read(e.start, e.end - e.start)
insns = md.disasm(buf, 0)
i = next(insns, None)
if i.mnemonic != "call":
continue
print(i.mnemonic, i.op_str)
if i.op_str.find("rip") != -1:
continue
j = i.op_str.find("+ 0x")
if j == -1:
continue
idx = int(i.op_str[j+2:-1], 16)
if idx > 0x1000:
continue
apiname = idxs.get(idx, None)
if not apiname:
continue
c = caComment()
if db.getComment(e.start, c) and c.text:
continue
c.address = e.start
c.text = apiname
db.setComment(c)
print(" ", apiname)
# update the view
v.update()
commentAPIs()