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Copy pathsimpleIAT_NX_vdb.py
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simpleIAT_NX_vdb.py
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import os
import sys
#VDB_ROOT = "<path-to-VDB>"
#API_ROOT = "<path-to-simpleAPI.py>"
sys.path.append(VDB_ROOT)
sys.path.append(API_ROOT)
#import simpleAPI as v_api
from simpleAPI import getOpCode, getIATLocation, printIAT, store_IAT, nxMemPerm, getOEP, printInfo
import vtrace
# import vdb
import envi
import envi.memory as mem
from envi.archs.i386 import *
import vtrace.envitools as envitools
import PE
import vstruct
# import vdb.recon as v_recon
# import vdb.recon.sniper as v_sniper
# import vdb.stalker as v_stalker
debug = True
###################################################################
class CustomNotifier(vtrace.Notifier):
def notify(self, event, trace):
iat_handler(event, trace)
#######################################################################
# Call this function from within a notifier to handle breakpoints on IAT
def iat_handler(event, trace):
print "[*] Got event: %d from pid %d" % (event, trace.getPid())
if event == vtrace.NOTIFY_ALL:
print "WTF, how did we get a vtrace.NOTIFY_ALL event?!?!"
elif event == vtrace.NOTIFY_SIGNAL:
#print "vtrace.NOTIFY_SIGNAL"
print "[*] PendingSignal",trace.getMeta("PendingSignal")
print "[*] PendingException",trace.getMeta("PendingException")
if trace.getMeta("Platform") == "Windows":
begin = trace.getMeta("IATBegin")
size = trace.getMeta("IATSize")
print "[*] Removing Memory Protections Location: %s" % hex(begin)
print "[*] Memory Size: %s" % size
trace.protectMemory(begin, size, envi.memory.MM_RWX)
# because MSVC debugger sucks at life
# 1080890248 (0x406d1388) is an exception used to name a thread
# 3765269347 (0xe06d7363) is an exception that is triggered when a throw happens
if (trace.getMeta("PendingSignal") != None) and \
(trace.getMeta("PendingSignal") != 1080890248) and\
(trace.getMeta("PendingSignal") != 3765269347):
win32event = trace.getMeta("Win32Event")
print "[*] ExceptionAddress: %(ExceptionAddress)x" % win32event
eip = trace.getRegister(REG_EIP)
dis = getOpCode(trace, trace.getRegister(REG_EIP))
disLen = len(dis)
opcode = trace.readMemory(eip, len(dis))
es = trace.getRegisterByName("es")
ds = trace.getRegisterByName("ds")
cs = trace.getRegisterByName("cs")
ef = trace.getRegisterByName("eflags")
edi = trace.getRegister(REG_EDI)
esi = trace.getRegister(REG_ESI)
esp = trace.getRegister(REG_ESP)
printInfo(trace)
if (len(opcode) == 1):
pass
# What is this for again?
# scasd i think \x66\xF2
elif (ord(opcode[0]) != 102 and ord(opcode[1]) != 242):
# function takes in just filename not the full path to filename.exe
filepath = trace.getMeta('ExeName')
exeName = filepath.split(".exe")[0]
fileName = exeName.split("\\")[len(exeName.split("\\"))-1]
if(trace.getMeta('IATLocation') == None):
base, poff, psize = getIATLocation(trace, fileName)
trace.setMeta('IATLocation', {'base':base, 'poff':poff, 'psize':psize})
else:
iatLoc = trace.getMeta('IATLocation')
base = iatLoc['base']
poff = iatLoc['poff']
psize = iatLoc['psize']
eip = trace.getRegister(REG_EIP)
dis = getOpCode(trace, trace.getRegister(REG_EIP))
# Check for \xff to determine if a deref call
if (ord(opcode[0]) == 255):
print "OPCODE[1]: ", ord(opcode[1])
# Need to accomodate more than just call [eax] and call [edx]
if (ord(opcode[1]) == 48):
eax = trace.getRegister(REG_EAX)
tmp_addr = struct.unpack("I",trace.readMemory(eax, 4))[0]
elif (ord(opcode[1]) == 16):
eax = trace.getRegister(REG_EAX)
tmp_addr = struct.unpack("I",trace.readMemory(eax, 4))[0]
elif (ord(opcode[1]) == 18):
edx = trace.getRegister(REG_EDX)
tmp_addr = struct.unpack("I",trace.readMemory(edx, 4))[0]
elif (ord(opcode[1]) == 80):
print "OPCODE[2]: ", ord(opcode[2])
#if (ord(opcode[2]) == 24):
eax = trace.getRegister(REG_EAX)
#eax += 24
eax += ord(opcode[2])
tmp_addr = struct.unpack("I",trace.readMemory(eax, 4))[0]
#print "EAX+24: %s" % repr(tmp_addr)
elif (ord(opcode[1]) == 112):
print "OPCODE[2]: ", ord(opcode[2])
eax = trace.getRegister(REG_EAX)
eax += ord(opcode[2])
tmp_addr = struct.unpack("I",trace.readMemory(eax, 4))[0]
elif (ord(opcode[1]) == 215):
edi = trace.getRegister(REG_EDI)
tmp_addr = struct.unpack("I",trace.readMemory(edi, 4))[0]
else :
tmp_addr = struct.unpack("I",opcode[len(dis)-4:len(dis)])[0]
################################
# Get the list of imported functions to compare against
try:
instr = trace.getMeta('IATInfo')
except:
base, importTable = printIAT(trace, fileName)
store_IAT(trace, base, importTable, "IATInfo")
instr = trace.getMeta('IATInfo')
print "TMP_ADDR: %s" % hex(tmp_addr)
try:
a = instr[tmp_addr]
except:
a = "UNKNOWN LIB: UNKNOWN FUNCTION"
b = a.split(':')
print "[*] \tLibrary: %s \n[*] \tFunction: %s" % (b[0], b[1])
try:
lst = trace.getMeta('IATList')
lst.append(hex(tmp_addr)+':'+b[0]+':'+b[1])
trace.setMeta('IATList', lst)
except:
print "SET Initial IATList Metadata"
trace.setMeta('IATList', [hex(tmp_addr)+':'+b[0]+':'+b[1]])
print "%16s: %s" % ("[*] Opcode[0]", ord(opcode[0]))
p = trace.getMeta('PendingSignal')
if p!= None:
trace.setMeta('OrigSignal', p)
trace.setMeta('PendingSignal', None)
print "STEPS"
trace.stepi()
print "[*] Protecting Memory Location: %s" % hex(begin)
print "[*] Memory Size: %s" % size
trace.protectMemory(begin, size, envi.memory.MM_NONE)
print "Run Again Set"
trace.runAgain(val=True)
print "---------------------------------------------------------"
elif event == vtrace.NOTIFY_BREAK:
print "vtrace.NOTIFY_BREAK", hex(trace.getRegister(REG_EIP))
print "[*] Bestname: ", trace.getSymByAddr(trace.getRegister(REG_EIP), exact=False)
pass
elif event == vtrace.NOTIFY_SYSCALL:
print "vtrace.NOTIFY_SYSCALL"
elif event == vtrace.NOTIFY_CONTINUE:
print "vtrace.NOTIFY_CONTINUE"
trace.runAgain(val=True)
print "---------------------------------------------------------"
elif event == vtrace.NOTIFY_EXIT:
print "vtrace.NOTIFY_EXIT"
print "ExitCode",trace.getMeta("ExitCode")
elif event == vtrace.NOTIFY_ATTACH:
print "vtrace.NOTIFY_ATTACH"
pass
elif event == vtrace.NOTIFY_DETACH:
print "vtrace.NOTIFY_DETACH"
pass
elif event == vtrace.NOTIFY_LOAD_LIBRARY:
print "vtrace.NOTIFY_LOAD_LIBRARY \t", trace.getMeta('LatestLibrary')
pass
elif event == vtrace.NOTIFY_UNLOAD_LIBRARY:
print "vtrace.NOTIFY_UNLOAD_LIBRARY"
pass
elif event == vtrace.NOTIFY_CREATE_THREAD:
print "vtrace.NOTIFY_CREATE_THREAD \t", trace.getMeta("ThreadId")
pass
elif event == vtrace.NOTIFY_EXIT_THREAD:
print "vtrace.NOTIFY_EXIT_THREAD"
print "ExitThread",trace.getMeta("ExitThread", -1)
pass
elif event == vtrace.NOTIFY_STEP:
print "vtrace.NOTIFY_STEP"
else:
print "vtrace.NOTIFY_WTF_HUH?", hex(trace.getRegister(REG_EIP))
#######################################################################
def load_binary(filepath, base=None):
trace.setMode("FastStep", 1)
filepath = trace.getMeta('ExeName')
fileName = os.path.basename(filepath).split('.')[0]
# Call a function to set BP on OEP
oep = getOEP(trace, filepath)
#######################################################################
# Get the list of imported functions to compare against
base, importTable = printIAT(trace, fileName)
base, poff, psize = getIATLocation(trace, fileName, debug)
# Store the IAT under the meta name IATInfo
store_IAT(trace, base, importTable, "IATInfo")
psize = trace.arch.getPointerSize()
memMap = trace.getMemoryMap(base+poff)
begin = memMap[0]
size = len(importTable) * psize
# put begin in size into the meta data
trace.setMeta("IATBegin", begin)
trace.setMeta("IATSize", size)
print "[*] Protecting Memory Location: %s" % hex(begin)
print "[*] Memory Size: %s" % size
trace.protectMemory(begin, size, envi.memory.MM_NONE)
#######################################################################
# Enable the notifier. Used later to catch the page execute exception.
notif = CustomNotifier()
eve = vtrace.NOTIFY_ALL
#eve = vtrace.NOTIFY_SIGNAL
trace.registerNotifier(eve, notif)
#######################################################################
######################################################################
load_binary("FOO")