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| import pykd
return_reg = "rax"
stack_pointer = "rsp"
arch_bits = 64
def get_address(localAddr):
res = pykd.dbgCommand("x " + localAddr)
result_count = res.count("\n")
if result_count == 0:
print localAddr + " not found."
return None
if result_count > 1:
print "[-] Warning, more than one result for", localAddr
return res.split()[0].replace('`','')
class handle_allocate_heap(pykd.eventHandler):
def __init__(self):
addr = get_address("ntdll!RtlAllocateHeap")
if addr == None:
return
self.bp_init = pykd.setBp(int(addr, 16), self.enter_call_back)
self.bp_end = None
def enter_call_back(self):
self.out = "RtlAllocateHeap("
if arch_bits == 32:
esp = pykd.reg(stack_pointer)
self.out += hex(pykd.ptrPtr(esp + 4)) + " , "
self.out += hex(pykd.ptrMWord(esp + 0x8)) + " , "
self.out += hex(pykd.ptrMWord(esp + 0xC)) + ") = "
else:
self.out += hex(pykd.reg("rcx")) + " , "
self.out += hex(pykd.reg("rdx")) + " , "
self.out += hex(pykd.reg("r8")) + ") = "
if self.bp_end == None:
disas = pykd.dbgCommand("uf ntdll!RtlAllocateHeap").split('\n')
for i in disas:
if 'ret' in i:
self.ret_addr = i.split()[0].replace('`','')
break
self.bp_end = pykd.setBp(int(self.ret_addr, 16), self.return_call_back)
return False
def return_call_back(self):
pykd.dprintln(self.out + hex(pykd.reg(return_reg)) + "\n")
return False
class handle_free_heap(pykd.eventHandler):
def __init__(self):
addr = get_address("ntdll!RtlFreeHeap")
if addr == None:
return
self.bp_init = pykd.setBp(int(addr, 16), self.enter_call_back)
self.bp_end = None
def enter_call_back(self):
self.out = "RtlFreeHeap("
if arch_bits == 32:
esp = pykd.reg(stack_pointer)
self.out += hex(pykd.ptrPtr(esp + 4)) + " , "
self.out += hex(pykd.ptrMWord(esp + 0x8)) + " , "
self.out += hex(pykd.ptrPtr(esp + 0xC)) + ") = "
else:
self.out += hex(pykd.reg("rcx")) + " , "
self.out += hex(pykd.reg("rdx")) + " , "
self.out += hex(pykd.reg("r8")) + ") = "
if self.bp_end == None:
disas = pykd.dbgCommand("uf ntdll!RtlFreeHeap").split('\n')
for i in disas:
if 'ret' in i:
self.ret_addr = i.split()[0].replace('`','')
break
self.bp_end = pykd.setBp(int(self.ret_addr, 16), self.return_call_back)
return False
def return_call_back(self):
ret_val = hex(pykd.reg("al"))
pykd.dprintln(self.out + ret_val + "\n")
return False
class handle_realloc_heap(pykd.eventHandler):
def __init__(self):
addr = get_address("ntdll!RtlReAllocateHeap")
if addr == None:
return
self.bp_init = pykd.setBp(int(addr, 16), self.enter_call_back)
self.bp_end = None
def enter_call_back(self):
self.out = "RtlReAllocateHeap("
if arch_bits == 32:
esp = pykd.reg(stack_pointer)
self.out += hex(pykd.ptrPtr(esp + 4)) + " , "
self.out += hex(pykd.ptrMWord(esp + 0x8)) + " , "
self.out += hex(pykd.ptrPtr(esp + 0xC)) + " , "
self.out += hex(pykd.ptrMWord(esp + 0x10)) + ") = "
else:
self.out += hex(pykd.reg("rcx")) + " , "
self.out += hex(pykd.reg("rdx")) + " , "
self.out += hex(pykd.reg("r8")) + " , "
self.out += hex(pykd.reg("r9")) + ") = "
if self.bp_end == None:
disas = pykd.dbgCommand("uf ntdll!RtlReAllocateHeap").split('\n')
for i in disas:
if 'ret' in i:
self.ret_addr = i.split()[0].replace('`','')
break
self.bp_end = pykd.setBp(int(self.ret_addr, 16), self.return_call_back)
return False
def return_call_back(self):
pykd.dprintln(self.out + hex(pykd.reg(return_reg)) + "\n")
return False
try:
pykd.reg("rax")
except:
arch_bits = 32
return_reg = "eax"
stack_pointer = "esp"
pykd.removeAllBp()
bp_a1 = handle_allocate_heap()
bp_a2 = handle_free_heap()
bp_a3 = handle_realloc_heap()
print 'bps=%x' %pykd.getNumberBreakpoints()
|