/
Adimeht_v1.0.1.py
1017 lines (889 loc) · 33.3 KB
/
Adimeht_v1.0.1.py
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# < NOTE >
# Every path must use the English
# Author : slimV
# May 16 2017
import pykd
import types
import re
import time
import socket
import sys
import capstone
import struct
class WinDbgBridge():
logPath = "C:\Users\slimv0x00\Desktop\dbiLog.txt"
imageName = ""
procImageBase = 0
procImageSize = 0
procImageEnd = 0
lSection = [] # list of sections' information [0: virtual address, 1: va end, 2: rva, 3: virtual size, 4: guard]
def __init__(self, md = None):
if md == None:
self.md = capstone.Cs(capstone.CS_ARCH_X86, capstone.CS_MODE_32)
else: self.md = md
self.md.detail = True
def initLog(self):
f = open(self.logPath, "w")
f.close()
def dbiprintf(self, str):
f = open(self.logPath, "a")
f.write(str + "\n")
f.close()
pykd.dprintln(str)
def getRegVal(self, regName):
cmdReg = "r %s" % regName
iParseBegin = "%s=" % regName
cmdr = pykd.dbgCommand(cmdReg)
strReg = cmdr[cmdr.find(iParseBegin) + len(iParseBegin):]
regVal = int(strReg, 16)
return regVal
def writeDword(self, addr, val):
cmd = "ed %x %x" % (addr, val)
guard = pykd.getVaProtect(addr)
self.vprotect(addr, 4, 0x40)
cmdr = pykd.dbgCommand(cmd)
self.vprotect(addr, 4, guard)
return 0
def writeMemory(self, addr, data):
cmdDw = "ed %x %x"
cmdB = "eb %x %x"
guard = pykd.getVaProtect(addr)
self.vprotect(addr, len(data), 0x40)
lenData = len(data)
scope = (lenData / 4) * 4
for dst in range(0, scope, 4):
cmdr = pykd.dbgCommand(cmdDw % (addr + dst, struct.unpack("<L", data[dst:dst+4])[0]))
for dst in range(scope, lenData):
cmdr = pykd.dbgCommand(cmdB % (addr + dst, struct.unpack("<B", data[dst])[0]))
self.vprotect(addr, len(data), guard)
return 0
def readDword(self, addr):
cmd = "dd %x L1" % addr
cmdr = pykd.dbgCommand(cmd)
try:
strVal = cmdr.split()
writeVal = int(strVal[1], 16)
return writeVal
except:
self.dbiprintf("[E] Cannot read memory")
self.dbiprintf(cmdr)
return 0
def readByte(self, addr):
cmd = "db %x L1" % addr
cmdr = pykd.dbgCommand(cmd)
try:
strVal = cmdr.split()
writeVal = int(strVal[1], 16)
return writeVal
except:
self.dbiprintf("[E] Cannot read memory")
self.dbiprintf(cmdr)
return 0
def readMemory(self, addr, len):
data = ""
scope = (len / 4) * 4
pin = addr + scope
end = addr + len
for dst in range(addr, pin, 4):
dw = self.readDword(dst)
#self.dbiprintf("0x%08x = 0x%08x" % (dst, dw))
data = data + struct.pack("<L", dw)
for dst in range(pin, end):
bb = self.readByte(dst)
#self.dbiprintf("0x%08x = 0x%02x" % (dst, bb))
data = data + struct.pack("<B", bb)
return data
def parseInstructionLine(self):
regModule = "[0-9a-fA-F]+ +[0-9a-fA-F]+ +.+"
cmdr = pykd.dbgCommand("r")
if type(cmdr) == types.NoneType:
self.dbiprintf(" - [E] Cannot load module list")
return -1
blist = re.findall(regModule, cmdr)
if blist == types.NoneType:
self.dbiprintf(" - [E] Cannot find %s" % (targetName))
bl = blist[0]
return bl
def parseInstructionBytes(self):
instLine = self.parseInstructionLine()
blist = instLine.split()
if len(blist) == 0:
self.dbiprintf("[E] Invalid instruction line : %s" % instLine)
return ""
strBytes = blist[1]
bytes = strBytes.decode("hex")
return bytes
def getImageInfo(self):
iPImageBaseBegin = "ImageBaseAddress:"
iPImageBaseEnd = "Ldr"
iPImageNameBegin = "ImageFile:"
iPImageNameEnd = "CommandLine"
self.dbiprintf("[!] Get image information")
cmdr = pykd.dbgCommand("!peb")
if type(cmdr) == types.NoneType:
self.dbiprintf(" - [E] Error on get PEB")
return 1
# get image base from PEB
if cmdr.find(iPImageBaseBegin) == -1:
self.dbiprintf(" - [E] Error on get image base address")
self.dbiprintf(cmdr)
return 2
strBase = cmdr[cmdr.find(iPImageBaseBegin) + len(iPImageBaseBegin):cmdr.find(iPImageBaseEnd)]
base = int(strBase, 16)
self.procImageBase = base
# get image name from PEB
if cmdr.find(iPImageNameBegin) == -1:
self.dbiprintf(" - [E] Error on get image name")
self.dbiprintf(cmdr)
return 3
path = cmdr[cmdr.find(iPImageNameBegin) + len(iPImageNameBegin):cmdr.find(iPImageNameEnd)]
name = path[path.rfind("\\") + 1:path.rfind("'")]
self.imageName = name
# get image end from module list
cmdr = pykd.dbgCommand("lm")
if type(cmdr) == types.NoneType:
self.dbiprintf(" - [E] Error on get module list")
return 4
if cmdr.find("%08x" % base) == -1:
self.dbiprintf(" - [E] Error to find image base address from module list")
self.dbiprintf(cmdr)
return 5
strImage = cmdr[cmdr.find("%08x" % base):]
lImage = strImage.split()
try:
if base != int(lImage[0], 16):
self.dbiprintf(" - [E] Error to find image base address from module list")
self.dbiprintf(cmdr)
return 6
self.procImageEnd = int(lImage[1], 16)
self.procImageSize = self.procImageEnd - self.procImageBase
except:
self.dbiprintf(" - [E] Error to find image base address from module list")
self.dbiprintf(cmdr)
return 7
self.dbiprintf(" -> Image name : %s ( 0x%08x ~ 0x%08x ( 0x%08x ) )" % (name, self.procImageBase, self.procImageEnd, self.procImageSize))
return 0
def getSectionInfo(self):
cmdDh = "!dh -s "
iParseSection = "SECTION HEADER"
iParseName = "name"
iParseVs = "virtual size"
iParseVa = "virtual address"
self.dbiprintf("[!] Get section information")
cmd = cmdDh + "%x" % self.procImageBase
cmdr = pykd.dbgCommand(cmd)
if type(cmdr) == types.NoneType:
self.dbiprintf(" - [E] Error on dump section header : 0x%08x" % self.procImageBase)
return 1
# add PE header's page
guard = pykd.getVaProtect(self.procImageBase)
self.lSection.append([self.procImageBase, self.procImageBase + 0x1000, 0, 0x1000, guard])
# add sections' page
tc = cmdr
while True:
if tc.find(iParseSection) == -1:
break
tc = tc[tc.find(iParseName) + len(iParseName):]
strVs = tc[:tc.find(iParseVs)]
vs = int(strVs, 16)
tc = tc[tc.find(iParseVs) + len(iParseVs):]
strVa = tc[:tc.find(iParseVa)]
rva = int(strVa, 16)
va = self.procImageBase + rva
vaEnd = va + vs
guard = pykd.getVaProtect(va)
self.dbiprintf(" -> Section #%d : 0x%08x ( 0x%08x ) : 0x%x" % (len(self.lSection), va, vs, guard))
self.lSection.append([va, vaEnd, rva, vs, guard])
return 0
def getSymbolFromAddr(self, addr):
iParseBegin = "Exact matches:"
cmdr = pykd.dbgCommand("ln %x" % addr)
if type(cmdr) == types.NoneType:
self.dbiprintf("[E] Cannot find symbol : 0x%08x" % addr)
return ""
if cmdr.find(iParseBegin) == -1:
self.dbiprintf("[E] Cannot find exact symbol : 0x%08x" % addr)
#self.dbiprintf(cmdr)
return ""
syms = cmdr[cmdr.find(iParseBegin) + len(iParseBegin):]
lSym = syms.split()
return lSym[0]
def getSectionNum(self, addr):
for i in range(len(self.lSection)):
if addr >= self.lSection[i][0] and addr < self.lSection[i][1]: # [0: vaBase, 1: vaEnd]
return i
return -1
def getOperands(self, inst):
operands = [] # list of operands [0: type, 1: value]
if len(inst.operands) > 0:
#self.dbiprintf(" - Operands : %d" % len(inst.operands))
for op in inst.operands:
opInfo = []
if op.type == capstone.x86.X86_OP_REG:
#self.dbiprintf(" - REG: %s" % (inst.reg_name(op.value.reg)))
opInfo.append("reg")
opInfo.append("%s" % inst.reg_name(op.value.reg))
elif op.type == capstone.x86.X86_OP_IMM:
#self.dbiprintf(" - IMM: 0x%x" % (op.value.imm))
opInfo.append("imm")
opInfo.append(op.value.imm)
elif op.type == capstone.x86.X86_OP_MEM: # [0: type, 1: mem addr string, 2: mem element list, 3: mem formula list, 4: mem address]
strSegReg = ""
strBaseReg = ""
strIndexReg = ""
strScale = ""
strDisp = ""
segReg = 0
baseReg = 0
indexReg = 0
scale = 0
disp = 0
baseVal = 0
indexVal = 0
memList = []
memList.append("[")
if op.value.mem.segment != 0:
segReg = op.value.mem.segment
strSegReg = "%s:" % inst.reg_name(segReg)
memList.append("%s" % inst.reg_name(segReg))
memList.append(":")
if op.value.mem.base != 0:
baseReg = op.value.mem.base
strBaseReg = inst.reg_name(baseReg)
baseVal = self.getRegVal("%s" % inst.reg_name(baseReg))
memList.append("%s" % inst.reg_name(baseReg))
if op.value.mem.index != 0:
indexReg = op.value.mem.index
strIndexReg = "+%s" % inst.reg_name(indexReg)
indexVal = self.getRegVal("%s" % inst.reg_name(indexReg))
memList.append("+")
memList.append("%s" % inst.reg_name(indexReg))
if op.value.mem.scale != 0:
scale = op.value.mem.scale
if scale != 1:
strScale = "*0x%x" % scale
memList.append("*")
memList.append(scale)
if op.value.mem.disp != 0:
disp = op.value.mem.disp
if disp > 0:
strDisp = "+0x%x" % disp
memList.append("+")
memList.append(disp)
else:
strDisp = "-0x%x" % (-disp)
memList.append("-")
memList.append(-disp)
memList.append("]")
memAddr = baseVal + (indexVal * scale) + disp
#self.dbiprintf(" - MEM: [%s%s%s%s%s] = 0x%08x" % (strSegReg, strBaseReg, strIndexReg, strScale, strDisp, memAddr))
opInfo.append("mem")
opInfo.append("[%08x]" % memAddr)
opInfo.append([strSegReg, strBaseReg, strIndexReg, strScale, strDisp])
opInfo.append(memList)
opInfo.append(memAddr)
elif op.type == capstone.x86.X86_OP_FP:
#self.dbiprintf(" - FP: %s" % (op.value.fp))
opInfo.append("fp")
opInfo.append("%s" % op.value.fp)
elif op.type == capstone.x86.X86_OP_INVALID:
#self.dbiprintf(" - UNINIT:")
opInfo.append("Uninit")
opInfo.append("Uninit")
else:
#self.dbiprintf(" - INVALID:")
opInfo.append("Invalid")
opInfo.append("Invalid")
operands.append(opInfo)
return operands
def vprotect(self, addr, size, guard):
cmdVprotect = "!sdbgext.vprotect %x %x %x"
cmdr = pykd.dbgCommand(cmdVprotect % (addr, size, guard))
#self.dbiprintf(cmdr)
class WinBpHandler(pykd.eventHandler):
def __init__(self, br = None):
if br == None: self.br = WinDbgBridge()
else: self.br = br
def unsetBp(self, addr):
cmdBl = "bl"
regBl = "\d +[e|d] +[0-9a-fA-F]+ "
cmdr = pykd.dbgCommand(cmdBl)
if type(cmdr) == types.NoneType:
self.br.dbiprintf(" - [E] Has any breaks")
return -1
#self.br.dbiprintf(cmdr)
bl = re.findall(regBl, cmdr)
for i in bl:
rel = i.split()
bNum = int(rel[0])
bAddr = int(rel[2], 16)
if bAddr == addr:
pykd.removeBp(bNum)
self.bp_end = None
#self.br.dbiprintf(" - [-] Unset break : 0x%08x" % bAddr)
def unsetBpOnEip(self):
eip = self.br.getRegVal("eip")
self.unsetBp(eip)
def setBpOnNextInst(self, handler):
eip = self.br.getRegVal("eip")
instBytes = self.br.parseInstructionBytes()
return pykd.setBp(eip + len(instBytes), handler)
class MemBpHandler(WinBpHandler):
hitMemory = None
hitAddress = 0
hitProtection = 0
lMemGuards = [] # list of memory guards info [N][0: base, 1: size, 2: end, 3: guard]
pIatBase = 0
pIatEnd = 0
sizeIat = 0
pCodeBase = 0
sizeCode = 0
pCodeEnd = 0
lOriginApi = {} # dictionary of original API info at address {address : [0: API address, 1: API name]}
lIatCodePatch = {} # dictionary of relation infos between code patch and IAT {IAT address : [patch addresses]}
currIat = 0
lCurrPatches = []
oep = 0
def __init__(self, lObfusMem, br = None):
self.lObfusMem = lObfusMem
pykd.eventHandler.__init__(self)
if br == None: self.br = WinDbgBridge()
else: self.br = br
self.bp_end = None
def forceSetIat(self, pIatBase, sizeIat):
self.pIatBase = pIatBase
self.sizeIat = sizeIat
self.pIatEnd = self.pIatBase + self.sizeIat
self.br.dbiprintf("[+] Force set IAT : 0x%08x ( 0x%x )" % (self.pIatBase, self.sizeIat))
#self.setBpMemoryOnWrite(self.pIatBase, self.sizeIat)
def setMemBpOnWriteOnIat(self):
guard = pykd.getVaProtect(self.pIatBase)
if guard != 0x2:
self.setBpMemoryOnWrite(self.pIatBase, self.sizeIat)
def forceSetCode(self, pCodeBase, sizeCode):
self.pCodeBase = pCodeBase
self.sizeCode = sizeCode
self.pCodeEnd = self.pCodeBase + self.sizeCode
self.br.dbiprintf("[+] Force set CODE section : 0x%08x ( 0x%x )" % (self.pCodeBase, self.sizeCode))
def setInitialProtection(self):
for i in range(len(self.br.lSection)):
s = self.br.lSection[i]
self.br.dbiprintf("[!] Set initial protection at Section #%d : 0x%08x ( 0x%08x ) : 0x%x" % (i, s[0], s[3], s[4]))
self.br.vprotect(s[0], s[3], s[4])
def restoreAllProtections(self):
for mem in self.lMemGuards:
self.br.vprotect(mem[0], mem[1], mem[3])
del self.lMemGuards[:]
self.setInitialProtection()
def setBpMemoryOnAccess(self, addr, size):
guard = pykd.getVaProtect(addr)
end = addr + size
self.lMemGuards.append([addr, size, end, guard])
self.br.dbiprintf("[!] Set BP Memory on Access at 0x%08x (0x%x) : Old protection 0x%x" % (addr, size, guard))
self.br.vprotect(addr, size, guard | 0x100)
def setBpMemoryOnWrite(self, addr, size):
guard = pykd.getVaProtect(addr)
end = addr + size
self.lMemGuards.append([addr, size, end, guard])
self.br.dbiprintf("[!] Set BP Memory on Write at 0x%08x (0x%x) : Old protection 0x%x" % (addr, size, guard))
self.br.vprotect(addr, size, 0x2)
def unsetBpMemoryOnWrite(self, addr, size):
mem = self.isRegisteredMemory(addr)
if mem != None:
self.br.vprotect(mem[0], mem[1], mem[3])
self.lMemGuards.remove(mem)
else:
self.br.dbiprintf("[E] Unregistered memory boundary : 0x%08x (0x%x)" % (addr, size))
def setTemporaryProtection(self):
if self.hitMemory != None:
guard = pykd.getVaProtect(self.hitMemory[0])
self.hitProtection = guard
self.br.vprotect(self.hitMemory[0], self.hitMemory[1], self.hitMemory[3])
else:
self.br.dbiprintf("[E] Has any memory violations yet")
def restoreTemporaryProtection(self):
if self.hitMemory != None:
self.br.vprotect(self.hitMemory[0], self.hitMemory[1], self.hitProtection)
self.hitMemory = None
self.hitAddress = 0
self.hitProtection = 0
else:
self.br.dbiprintf("[E] Has any memory violations yet")
def isRegisteredMemory(self, addr):
for mem in self.lMemGuards:
if mem[0] <= addr and mem[2] > addr:
return mem
return None
def isInIat(self, addr):
if self.pIatBase <= addr and self.pIatEnd > addr:
return True
return False
def isInCode(self, addr):
if self.pCodeBase <= addr and self.pCodeEnd > addr:
return True
return False
# WinDbg -> Debug -> Event Filters -> Disable the Access violation
def onException(self, exceptInfo):
#self.br.dbiprintf("[!] Exception occured")
if exceptInfo.exceptionCode == 0x80000001: # GUARD_PAGE_VIOLATION # Memory breakpoint with PAGE_GUARD
#self.br.dbiprintf("GUARD_PAGE")
#cmdr = pykd.dbgCommand("r")
#self.br.dbiprintf(cmdr)
eip = self.br.getRegVal("eip")
if self.isInCode(eip): # Probably reached to OEP
self.br.dbiprintf("[+] Probably OEP : 0x%08x" % eip)
self.oep = eip
cmdr = pykd.dbgCommand("r")
self.br.dbiprintf(cmdr)
self.restoreAllProtections()
return pykd.eventResult.Break
self.bp_end = self.setBpOnNextInst(self.handler_onAccessMemory)
return pykd.eventResult.Proceed
elif exceptInfo.exceptionCode == 0xc0000005: # ACCESS_VIOLATION # Memory breakpoint with PAGE_READONLY
#cmdr = pykd.dbgCommand("r")
#self.br.dbiprintf(cmdr)
instBytes = self.br.parseInstructionBytes()
if instBytes == "":
self.br.dbiprintf(self.br.parseInstructionLine())
return pykd.eventResult.Break
eip = self.br.getRegVal("eip")
for inst in self.br.md.disasm(instBytes, eip):
#self.br.dbiprintf("0x%08x\t%s\t%s" % (inst.address, inst.mnemonic, inst.op_str))
ops = self.br.getOperands(inst)
if ops[0][0] == "mem":
#cmdr = pykd.dbgCommand("r")
#self.br.dbiprintf(cmdr)
addr = ops[0][4]
self.hitMemory = self.isRegisteredMemory(addr)
#self.br.dbiprintf("Write on memory at 0x%08x" % addr)
if self.hitMemory != None: # Registered memory area
#self.br.dbiprintf("[!] MemBp on write at 0x%08x" % addr)
self.hitAddress = addr
self.setTemporaryProtection()
if self.isInIat(addr): # on IAT
self.bp_end = self.setBpOnNextInst(self.handler_onWriteIat)
elif self.isInCode(addr): # on CODE section
self.br.dbiprintf(" - 0x%08x" % addr)
self.lCurrPatches.append(addr)
self.bp_end = self.setBpOnNextInst(self.handler_onWriteMemory)
else:
#cmdr = pykd.dbgCommand("r")
#self.br.dbiprintf(cmdr)
if addr in self.lOriginApi:
del self.lOriginApi[addr]
if len(ops) > 1:
src = ops[1]
if src[0] == "mem":
if src[4] in self.lOriginApi:
apiInfo = self.lOriginApi[src[4]]
self.br.dbiprintf("[+] 0x%08x <= 0x%08x ( %s )" % (addr, src[4], apiInfo[1]))
self.lOriginApi[addr] = apiInfo
if src[4] >= 0x10000000: # library address boundary
sym = self.br.getSymbolFromAddr(src[4])
if sym != "":
self.br.dbiprintf("[+] 0x%08x <= 0x%08x ( %s )" % (addr, src[4], sym))
self.lOriginApi[addr] = [src[4], sym]
else:
self.br.dbiprintf("[?] 0x%08x <= 0x%08x" % (addr, src[4]))
else:
self.br.dbiprintf("[?] 0x%08x <= 0x%08x" % (addr, src[4]))
self.bp_end = self.setBpOnNextInst(self.handler_onWriteMemory)
#return pykd.eventResult.Break
return pykd.eventResult.Proceed
else:
self.br.dbiprintf("[E] Unknown ACCESS_VIOLATION occured")
cmdr = pykd.dbgCommand("r")
self.br.dbiprintf(cmdr)
return pykd.eventResult.Break
return pykd.eventResult.NoChange
def handler_onAccessMemory(self):
self.unsetBpOnEip()
if self.hitMemory == None:
self.br.dbiprintf("[E] Memory on write handler at unknown ACCESS_VIOLATION")
cmdr = pykd.dbgCommand("r")
self.br.dbiprintf(cmdr)
return pykd.eventResult.Break
self.setBpMemoryOnAccess(self.pCodeBase, self.sizeCode)
return pykd.eventResult.Proceed
def handler_onWriteMemory(self):
self.unsetBpOnEip()
if self.hitMemory == None:
self.br.dbiprintf("[E] Memory on write handler at unknown ACCESS_VIOLATION")
cmdr = pykd.dbgCommand("r")
self.br.dbiprintf(cmdr)
return pykd.eventResult.Break
addr = self.hitAddress
self.restoreTemporaryProtection()
#cmdr = pykd.dbgCommand("r")
#self.br.dbiprintf(cmdr)
return pykd.eventResult.Proceed
def handler_onWriteIat(self):
self.unsetBpOnEip()
if self.hitMemory == None:
self.br.dbiprintf("[E] IAT on write handler at unknown ACCESS_VIOLATION")
cmdr = pykd.dbgCommand("r")
self.br.dbiprintf(cmdr)
return pykd.eventResult.Break
addr = self.hitAddress
self.restoreTemporaryProtection()
val = self.br.readDword(addr)
if val != 0:
if val in self.lOriginApi:
apiInfo = self.lOriginApi[val]
apiAddr = apiInfo[0]
sym = apiInfo[1]
else:
sym = self.br.getSymbolFromAddr(val)
apiAddr = val
self.setBpMemoryOnWrite(self.pCodeBase, self.sizeCode)
# save relation infos between code patch and IAT
if self.currIat != 0:
if self.currIat in self.lIatCodePatch:
self.br.dbiprintf("[E] Already has value at 0x%08x in IAT : Cannot save 0x%08x ( %s )" % (addr, val, sym))
else:
self.lIatCodePatch[self.currIat] = self.lCurrPatches
self.currIat = addr
self.lCurrPatches = []
# resolve original API of address in IAT
if sym != "":
self.br.dbiprintf("[IAT] 0x%08x <= 0x%08x ( 0x%08x : %s )" % (addr, val, apiAddr, sym))
self.br.writeDword(addr, apiAddr)
else: # Invalid obfuscated area
instBytes = self.br.readMemory(val, 0x10)
for inst in self.br.md.disasm(instBytes, val):
if len(inst.groups) > 0:
for g in inst.groups:
if g == capstone.x86.X86_GRP_JUMP:
#self.br.dbiprintf(" - Jump")
#self.br.dbiprintf("0x%08x\t%s\t%s" % (inst.address, inst.mnemonic, inst.op_str))
ops = self.br.getOperands(inst)
if len(ops) > 0:
if ops[0][0] == "imm":
dst = ops[0][1]
#self.br.dbiprintf(" - Jump to 0x%08x" % dst)
if dst in self.lOriginApi:
sym = self.lOriginApi[dst]
else:
sym = self.br.getSymbolFromAddr(dst)
if sym != "":
self.br.dbiprintf("[IAT] 0x%08x <= 0x%08x ( 0x%08x : %s )" % (addr, val, dst, sym))
self.br.writeDword(addr, dst)
self.bp_end = None
return pykd.eventResult.Proceed
break
self.br.dbiprintf("[E][IAT] 0x%08x <= 0x%08x ( Invalid )" % (addr, val))
self.bp_end = None
return pykd.eventResult.Proceed
class Handler_AllocateVirtualMemory(WinBpHandler):
symNtdll = r"ntdll"
symAllocateVirtualMemory = r"NtAllocateVirtualMemory"
hNtdll = 0
pAllocateVirtualMemory = 0
iVmPAllocAddr = 0
iVmPAllocSize = 0
iVmProtection = 0
iVmAllocAddr = 0
iVmAllocSize = 0
pRet = 0
def __init__(self, lObfusMem, br = None, memh = None):
self.lObfusMem = lObfusMem
if br == None: self.br = WinDbgBridge()
else: self.br = br
if memh == None: self.memh = MemBpHandler()
else: self.memh = memh
self.hNtdll = pykd.module(self.symNtdll)
self.pAllocateVirtualMemory = self.hNtdll.offset(self.symAllocateVirtualMemory)
self.br.dbiprintf("[!] %s!%s = 0x%08x" % (self.symNtdll, self.symAllocateVirtualMemory, self.pAllocateVirtualMemory))
self.bp_init = pykd.setBp(self.pAllocateVirtualMemory, self.handler_onCall)
self.bp_end = None
def __del__(self):
self.unsetBp(self.pAllocateVirtualMemory)
if self.bp_end != None:
self.unsetBp(self.pRet)
self.bp_init = None
self.bp_end = None
def handler_onCall(self):
cmdr = pykd.dbgCommand("dd esp+8 L1")
if cmdr == None:
self.br.dbiprintf("[E] Before %s : Cannot dump stack" % self.symAllocateVirtualMemory)
return pykd.eventResult.Break
strPAllocAddr = cmdr[cmdr.find(" "):]
iPAllocAddr = int(strPAllocAddr, 16)
cmdr = pykd.dbgCommand("dd esp+10 L1")
if cmdr == None:
self.br.dbiprintf("[E] Before %s : Cannot dump stack" % self.symAllocateVirtualMemory)
return pykd.eventResult.Break
strPAllocSize = cmdr[cmdr.find(" "):]
iPAllocSize = int(strPAllocSize, 16)
cmdr = pykd.dbgCommand("dd esp+18 L1")
if cmdr == None:
self.br.dbiprintf("[E] Before %s : Cannot dump stack" % self.symAllocateVirtualMemory)
return pykd.eventResult.Break
strProtection = cmdr[cmdr.find(" "):]
iProtection = int(strProtection, 16)
if iProtection == 0x40:
#self.br.dbiprintf("[*] Allocating memory for obfuscation has detected")
#self.br.dbiprintf(" -> pAlloc : 0x%08x" % iPAllocAddr)
self.iVmPAllocAddr = iPAllocAddr
self.iVmPAllocSize = iPAllocSize
self.iVmProtection = iProtection
cmdr = pykd.dbgCommand("dd esp L1")
strRet = cmdr[cmdr.find(" "):]
self.pRet = int(strRet, 16)
#self.br.dbiprintf(" -> Set break on RET : 0x%08x" % self.pRet)
self.bp_end = pykd.setBp(self.pRet, self.handler_onRet)
return pykd.eventResult.Proceed
def handler_onRet(self):
self.unsetBpOnEip()
#self.br.dbiprintf(" -> after pAlloc : 0x%08x" % self.iVmPAllocAddr)
cmdr = pykd.dbgCommand("dd %x L1" % self.iVmPAllocAddr)
if cmdr == None:
self.br.dbiprintf("[E] After %s : Cannot dump memory" % self.symAllocateVirtualMemory)
return pykd.eventResult.Break
strAllocAddr = cmdr[cmdr.find(" "):]
iAllocAddr = int(strAllocAddr, 16)
self.iVmAllocAddr = iAllocAddr
#self.br.dbiprintf(" -> after pSize : 0x%08x" % self.iVmPAllocSize)
cmdr = pykd.dbgCommand("dd %x L1" % self.iVmPAllocSize)
if cmdr == None:
self.br.dbiprintf("[E] After %s : Cannot dump memory" % self.symAllocateVirtualMemory)
return pykd.eventResult.Break
strAllocSize = cmdr[cmdr.find(" "):]
iAllocSize = int(strAllocSize, 16)
self.iVmAllocSize = iAllocSize
self.lObfusMem[iAllocAddr] = iAllocSize
self.memh.setBpMemoryOnWrite(iAllocAddr, iAllocSize)
self.br.dbiprintf("[+] Allocating obfuscation memory(0x%08x) = 0x%08x" % (iAllocSize, iAllocAddr))
self.memh.setMemBpOnWriteOnIat()
self.pRet = 0
self.bp_end = None
return pykd.eventResult.Proceed
class Handler_FreeVirtualMemory(WinBpHandler):
symNtdll = r"ntdll"
symFreeVirtualMemory = r"NtFreeVirtualMemory"
hNtdll = 0
pFreeVirtualMemory = 0
def __init__(self, lObfusMem, br = None, memh = None):
self.lObfusMem = lObfusMem
if br == None: self.br = WinDbgBridge()
else: self.br = br
if memh == None: self.memh = MemBpHandler()
else: self.memh = memh
self.hNtdll = pykd.module(self.symNtdll)
self.pFreeVirtualMemory = self.hNtdll.offset(self.symFreeVirtualMemory)
self.br.dbiprintf("[!] %s!%s = 0x%08x" % (self.symNtdll, self.symFreeVirtualMemory, self.pFreeVirtualMemory))
self.bp_init = pykd.setBp(self.pFreeVirtualMemory, self.handler_onCall)
self.bp_end = None
def __del__(self):
self.unsetBp(self.pFreeVirtualMemory)
self.bp_init = None
self.bp_end = None
def handler_onCall(self):
cmdr = pykd.dbgCommand("dd esp+8 L1")
if cmdr == None:
self.br.dbiprintf("[E] Before %s!%s : Cannot dump stack" % (self.symNtdll, self.symFreeVirtualMemory))
return pykd.eventResult.Break
strPFreeAddr = cmdr[cmdr.find(" "):]
iPFreeAddr = int(strPFreeAddr, 16)
cmdr = pykd.dbgCommand("dd %x L1" % iPFreeAddr)
if cmdr == None:
self.br.dbiprintf("[E] Before %s!%s : Cannot dump memory" % (self.symNtdll, self.symFreeVirtualMemory))
return pykd.eventResult.Break
strFreeAddr = cmdr[cmdr.find(" "):]
iFreeAddr = int(strFreeAddr, 16)
if iFreeAddr in self.lObfusMem:
del self.lObfusMem[iFreeAddr]
mem = self.memh.isRegisteredMemory(iFreeAddr)
if mem != None:
self.memh.unsetBpMemoryOnWrite(mem[0], mem[1])
self.br.dbiprintf("[-] Free obfuscation memory(0x%08x)" % iFreeAddr)
if iFreeAddr in self.memh.lOriginApi:
self.br.dbiprintf("[!] API obfuscation is over")
if self.memh.currIat != 0:
#self.br.dbiprintf("[+] Saving last code patching info : 0x%08x" % (self.memh.currIat))
if self.memh.currIat in self.memh.lIatCodePatch:
self.br.dbiprintf("[E] Already has value at 0x%08x in IAT : Cannot save last code patching info" % (self.memh.currIat))
else:
self.memh.lIatCodePatch[self.memh.currIat] = self.memh.lCurrPatches
self.memh.restoreAllProtections()
self.memh.setBpMemoryOnAccess(self.memh.pCodeBase, self.memh.sizeCode)
return pykd.eventResult.Proceed
class WindbgDbi():
winBr = None
lObfusMem = {} # memories for obfuscated API [Addr] = Size
symPath = "SRV*c:\\code\\symbols*http://msdl.microsoft.com/download/symbols;SRV*c:\\code\\symbols*https://chromium-browser-symsrv.commondatastorage.googleapis.com"
dumpPath = "c:\\Users\\slimv0x00\\Desktop\\"
maxDumpSectionNum = 3
lDumpNames = []
def __init__(self):
self.winBr = WinDbgBridge()
def patchCall(self, patchInfos):
self.winBr.dbiprintf("[!] Code patching")
lastPatch = 0
mBase = self.winBr.procImageBase
for pIat in patchInfos.keys():
self.winBr.dbiprintf("[IAT] 0x%08x" % pIat)
patchList = patchInfos[pIat]
for j in range(len(patchList)):
pOvw = patchList[j]
self.winBr.dbiprintf(" - 0x%08x" % pOvw)
if pOvw > lastPatch:
patchGap = pOvw - lastPatch
else:
patchGap = lastPatch - pOvw
if patchGap > 5:
destBuf = self.winBr.readMemory(pOvw, 2)
if destBuf.find("\xe8") != -1: # call
patch = "\xff\x15" + struct.pack("<L", pIat)
self.winBr.writeMemory(pOvw, patch)
lastPatch = pOvw
elif destBuf.find("\xe9") != -1: #jmp
patch = "\xff\x25" + struct.pack("<L", pIat)
self.winBr.writeMemory(pOvw, patch)
lastPatch = pOvw
else:
vDest = struct.unpack("<H", destBuf)[0]
if vDest != 0x15ff and vDest != 0x25ff:
self.winBr.dbiprintf(hex(pOvw) + " = Unknown patch syntax")
self.winBr.dbiprintf(hex(struct.unpack("<H", destBuf)[0]))
self.winBr.dbiprintf("[!] Function number : " + str(len(patchInfos)))
def dumpMemory(self, dumpPath, addr, size):
lineNumber = 0x40
mapSize = 0x1000
cmdDd = "dd %x L%x"
regDd = "[0-9a-fA-F]+ +[0-9a-fA-F]+ +[0-9a-fA-F]+ +[0-9a-fA-F]+ +[0-9a-fA-F]+"
if size <= 0:
self.winBr.dbiprintf("[E] Invalid dump size : 0x%08x" % size)
return
pykd.dprint("[+] Dump 0x%08x ( 0x%08x )" % (addr, size))
dSize = size / mapSize
if size % mapSize != 0:
dSize = dSize + 1
dSize = dSize * mapSize
fileName = "dump_0x%x (0x%x).bin" % (addr, dSize)
self.lDumpNames.append(fileName)
fullPath = dumpPath + fileName
f = open(fullPath, "wb")
fullLoop = dSize / (lineNumber * 4)
ta = addr
for l in range(fullLoop):
#self.winBr.dbiprintf(" -> 0x%08x" % ta)
pykd.dprint(".")
cmd = cmdDd % (ta, lineNumber)
cmdr = pykd.dbgCommand(cmd)
#self.winBr.dbiprintf(cmdr)
ta = ta + (lineNumber * 4)
bl = re.findall(regDd, cmdr)
for i in bl:
#self.winBr.dbiprintf(i)
rel = i.split()
f.write(struct.pack("<L", int(rel[1], 16)))
f.write(struct.pack("<L", int(rel[2], 16)))
f.write(struct.pack("<L", int(rel[3], 16)))
f.write(struct.pack("<L", int(rel[4], 16)))
self.winBr.dbiprintf("")
f.close()
self.winBr.dbiprintf(" -> %s" % fullPath)
def rebuild(self, path):
lAddr = []
iat_ptr = 0x0
iat_size = 0x0
self.winBr.dbiprintf("\n[!] Rebuild PE")
buildPath = path + "rebuilt.exe"
hRebuild = open(buildPath, "wb")
lSectionNames = ["DOS", "CODE", "DATA", "SFX00", "SFX01", "SFX02", "SFX03"]
section_headers = []
self.winBr.dbiprintf(" -> Constructing Headers")
cntLine = 0
for line in self.lDumpNames:
tBase = int(line[line.find("_") + 1:line.find(" (")], 16)
tSize = int(line[line.find("(") + 1:line.find(")")], 16)
if cntLine == 0:
dumpPath = path + line
hDump = open(dumpPath, "rb")
mBase = tBase
dos_header = hDump.read(0x40)
hDump.seek(struct.unpack("<L", dos_header[-4:])[0])
nt_header = hDump.read(4)
file_header = hDump.read(0x14)
opt_header = hDump.read(0x60)
nDataDir = struct.unpack("<L", opt_header[-4:])[0]
lDataDir = []
for i in range(nDataDir):
lDataDir.append(hDump.read(0x8))
dos_header = dos_header[:0x3c] + struct.pack("<L", len(dos_header))
hRebuild.write(dos_header)
hRebuild.write(nt_header)
hDump.close()
else:
section = lSectionNames[cntLine]
for i in range(8 - len(lSectionNames[cntLine])):
section += struct.pack("<B", 0x0)
section += struct.pack("<L", tSize) # virtual size
section += struct.pack("<L", tBase - mBase) # rva
section += struct.pack("<L", tSize) # size of raw
section += struct.pack("<L", tBase - mBase) # ptr to raw
section += struct.pack("<L", 0x0) # ptr to rel
section += struct.pack("<L", 0x0) # ptr to line
section += struct.pack("<H", 0x0) # num of rel
section += struct.pack("<H", 0x0) # num of line
section += struct.pack("<L", 0xe0000020) # characteristics
section_headers.append(section)
cntLine = cntLine + 1
self.winBr.dbiprintf(" -> Rebuilding : %d sections" % len(section_headers))
file_header = file_header[:2] + struct.pack("<H", len(section_headers)) + file_header[4:]
hRebuild.write(file_header)
opt_header = opt_header[:4] + section_headers[0][0x8:0xc]\
+ section_headers[1][0x8:0xc] + struct.pack("<L", 0x0) + struct.pack("<L", 0xd878)\
+ section_headers[0][0xc:0x10] + section_headers[1][0xc:0x10]\
+ opt_header[0x1c:]
lDataDir[1] = struct.pack("<L", iat_ptr) + struct.pack("<L", iat_size)
for i in lDataDir:
opt_header += i
hRebuild.write(opt_header)
for i in range(len(section_headers)):
hRebuild.write(section_headers[i])
fp = hRebuild.tell()
sectionEnd = (((fp + (len(section) * len(section_headers))) / 0x1000) + 1) * 0x1000
paddingSize = sectionEnd - fp
hRebuild.write("\x00" * paddingSize)
for i in range(len(section_headers)):
self.winBr.dbiprintf(path + self.lDumpNames[i + 1])
hBin = open(path + self.lDumpNames[i + 1], "rb")
while True:
stream = hBin.read(0x1000)
if not stream:
break
hRebuild.write(stream)
hBin.close()
self.winBr.dbiprintf("\n[!] Rebuilt PE : %s" % (buildPath))
hRebuild.close()
def run(self):
self.winBr.initLog()
self.winBr.dbiprintf("< WinDbg DBI >")
if self.winBr.getImageInfo() != 0:
self.winBr.dbiprintf("[!] Check the symbol path ( Recommended : %s )" % self.symPath)
return 1
if self.winBr.getSectionInfo() != 0:
return 2
if self.winBr.procImageBase != -1 and self.winBr.procImageEnd != -1 and self.winBr.procImageSize != 0:
memBpHandler = MemBpHandler(self.lObfusMem, self.winBr)
memBpHandler.forceSetIat(self.winBr.procImageBase + 0x2000, 0xa00) # IAT
memBpHandler.forceSetCode(self.winBr.lSection[1][0], self.winBr.lSection[1][3])
handler_AllocateVirtualMemory = Handler_AllocateVirtualMemory(self.lObfusMem, self.winBr, memBpHandler)
handler_FreeVirtualMemory = Handler_FreeVirtualMemory(self.lObfusMem, self.winBr, memBpHandler)
pykd.go()
self.winBr.dbiprintf("[!] PYKD retake the control")