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struct_spy.py
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struct_spy.py
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#!/usr/bin/env python
# $Id: struct_spy.py 233 2009-02-12 19:01:53Z codyrpierce $
'''
Struct Spy
Copyright (C) 2006 Cody Pierce <codyrpierce@gmail.com>
Description: This PyDbg will monitor structures being used based on
their register+offset instruction. It will log all read, writes, and
values, along with the addresses they occured at. It will then output
this into a navigable html where you can drill down into the
structure and its access.
'''
######################################################################
#
# Includes
#
######################################################################
import sys
import os
import string
import struct
import time
import atexit
from pydbg import *
from pydbg.defines import *
from ctypes import *
kernel32 = windll.kernel32
######################################################################
#
# Our data classes
#
######################################################################
class Breakpoint:
address = 0x00000000
def __init__(self, address):
self.address = address
self.hit_count = 0
self.description = "None"
self.handler = self.breakpoint_handler
def set_breakpoint(self, dbg):
dbg.bp_set(self.address)
return True
def breakpoint_handler(self, dbg):
return DBG_CONTINUE
class DbgException:
current_id = 0
def __init__(self, dbg):
DbgException.current_id += 1
self.id = DbgException.current_id
self.address = dbg.exception_address
self.module = dbg.addr_to_module(self.address).szModule
if dbg.write_violation:
self.direction = "write"
else:
self.direction = "read"
self.violation_address = dbg.violation_address
self.violation_thread_id = dbg.dbg.dwThreadId
self.context = dbg.context
self.context_dump = dbg.dump_context(self.context, print_dots=False)
self.disasm = dbg.disasm(self.address)
self.disasm_around = dbg.disasm_around(self.address)
self.call_stack = dbg.stack_unwind()
self.seh_unwind = dbg.seh_unwind
def render_text(self, dbg, path):
filename = "%s.%x" % (path, self.address)
try:
fh = open(filename + ".txt", "w")
except:
print "[!] Problem opening exception file %s" % filename
sys.exit(-1)
fh.write("\nException [0x%08x]\n" % self.address)
fh.write("=" * 72)
fh.write("\nDirection: %s\n" % self.direction)
fh.write("Disasm: %s\n" % self.disasm)
fh.write("Context:\n%s\n" % self.context_dump)
fh.write("Call Stack:\n")
for addr in self.call_stack:
fh.write(" %s!0x%08x\n" % (dbg.addr_to_module(addr).szModule, addr))
fh.write("\n")
fh.close()
def render_html(self, dbg, path):
filename = "%s.%x" % (path, self.address)
try:
fh = open(filename + ".html", "w")
except:
print "[!] Problem opening exception file %s" % filename
sys.exit(-1)
fh.write("<html><head><title>Exception 0x%x</title></head><body><br>" % self.address)
fh.write("\nException [0x%08x]<br>" % self.address)
fh.write("=" * 72)
fh.write("<br>Direction: %s<br>" % self.direction)
fh.write("Disasm: %s<br>" % self.disasm)
fh.write("Context:<br><pre>%s</pre><br>" % self.context_dump)
fh.write("Call Stack:<br>")
for addr in self.call_stack:
fh.write(" %s!0x%08x<br>" % (dbg.addr_to_module(addr).szModule, addr))
fh.write("<br>")
fh.write("</body></html>")
fh.close()
def display(self,dbg):
print "\nException [0x%08x]" % self.address
print "=" * 72
print "Direction: %s" % self.direction
print "Disasm: %s" % self.disasm
print "Context:\n%s" % self.context_dump
print "Call Stack:"
for addr in self.call_stack:
print " %s!0x%08x" % (dbg.addr_to_module(addr).szModule, addr)
print "\n"
class Offset:
def __init__(self, parent, offset, size=4):
self.parent = parent
self.offset = offset
self.size = size
self.orig_data = ""
self.data = ""
self.dbg_exceptions = []
self.modifications = []
self.mod_addr = 0x00000000
self.read_count = 0
self.write_count = 0
self.last_read = 0x00000000
self.last_write = 0x00000000
self.last_exception_id = 0
self.last_module = 0x00000000
self.handler = self.offset_handler
self.description = "No description"
def offset_handler(self, dbg):
print "[*] Hit Offset Handler @ [%04d] 0x%08x 0x%08x" % (self.last_exception_id, dbg.exception_address, self.mod_addr)
if dbg.exception_address != self.mod_addr:
self.modifications.append((self.last_exception_id, dbg.read_process_memory(self.parent.address + self.offset, 4)))
elif dbg.exception_address == self.mod_addr:
self.modifications.append((self.last_exception_id, dbg.read_process_memory(self.parent.address + self.offset, 4)))
#dbg.set_callback(EXCEPTION_SINGLE_STEP, dbg.exception_handler_single_step)
dbg.single_step(False)
return DBG_CONTINUE
def render_text(self, dbg, path, excepts=True):
filename = "%s.%x" % (path, self.offset)
try:
fh = open(filename + ".txt", "w")
except:
print "[!] Problem offset opening %s" % filename
sys.exit(-1)
fh.write("\nOffset [0x%08xx+0x%x]:\n" % (self.parent.address, self.offset))
fh.write("=" * 72)
fh.write("\nDescription: %s\n" % self.description)
fh.write("Address: 0x%08x\n" % (self.parent.address + self.offset))
fh.write("Size: %d\n" % self.size)
fh.write("Read Count: %d\n" % self.read_count)
fh.write("Last Read: 0x%08x\n" % self.last_read)
fh.write("Write Count: %d\n" % self.write_count)
fh.write("Last Write: 0x%08x\n" % self.last_write)
fh.write("Last Module: %s\n" % self.last_module)
if excepts:
for dbgexcept in self.dbg_exceptions:
fh.write("Exception: 0x%08x %s\n" % (dbgexcept.address, dbgexcept.disasm))
dbgexcept.render_html(dbg, filename)
fh.write("\n")
fh.close()
def render_html(self, dbg, path, excepts=True):
filename = "%s.%x" % (path, self.offset)
try:
fh = open(filename + ".html", "w")
except:
print "[!] Problem offset opening %s" % filename
sys.exit(-1)
fh.write("<html><head><title>Offset 0x%08x+%x</title></head><body><br>" % (self.parent.address, self.offset))
fh.write("\nOffset [0x%08x+0x%x]:<br>" % (self.parent.address, self.offset))
fh.write("=" * 72)
fh.write("<br>Description: %s<br>" % self.description)
fh.write("Address: 0x%08x<br>" % (self.parent.address + self.offset))
fh.write("Size: %d<br>" % self.size)
fh.write("Read Count: %d<br>" % self.read_count)
fh.write("Last Read: 0x%08x<br>" % self.last_read)
fh.write("Write Count: %d<br>" % self.write_count)
fh.write("Last Write: 0x%08x<br>" % self.last_write)
fh.write("Last Module: %s<br>" % self.last_module)
if excepts:
fh.write("<table cellspacing=10><tr><td>")
for dbgexcept in self.dbg_exceptions:
fh.write("[%04d]: <a href=\"%s.%x.html\">0x%08x</a><br>" % (dbgexcept.id, filename.split('/')[-1], dbgexcept.address, dbgexcept.address))
dbgexcept.render_html(dbg, filename)
fh.write("</td><td>")
for dbgexcept in self.dbg_exceptions:
fh.write("[%.5s]<br>" % dbgexcept.direction)
fh.write("</td><td>")
for dbgexcept in self.dbg_exceptions:
fh.write("%s<br>" % dbgexcept.disasm)
fh.write("</td><td>")
for (id,data) in self.modifications:
fh.write("[%04d] 0x%08x<br>" % (id, struct.unpack("<L", data)[0]))
fh.write("</td></tr></table>")
fh.write("<br>")
fh.write("</body></html>")
fh.close()
def display(self, dbg, excepts=True):
print "\nOffset [0x%08xx+0x%x]:" % (self.parent.address, self.offset)
print "=" * 72
print "Description: %s" % self.description
print "Address: 0x%08x" % (self.parent.address + self.offset)
print "Size: %d" % self.size
print "Read Count: %d" % self.read_count
print "Last Read: 0x%08x" % self.last_read
print "Write Count: %d" % self.write_count
print "Last Write: 0x%08x" % self.last_write
print "Last Module: %s" % self.last_module
if excepts:
for dbgexcept in self.dbg_exceptions:
dbgexcept.display(dbg)
print "\n"
class Structure:
def __init__(self, address, length, timestamp):
self.address = address
self.size = length
self.timestamp = timestamp
self.orig_data = ""
self.data = ""
self.offsets = []
self.handler = self.structure_handler
self.description = "None"
def exists(self, offset):
for off in offsets:
if offset == off.offset:
return True
return False
def add_offset(self, offset):
off = Offset(self, offset)
self.offset.append(off)
def structure_handler(self, dbg):
#print "[*] Hit Structure Handler"
if not dbg.memory_breakpoint_hit:
return DBG_CONTINUE
module = dbg.addr_to_module(dbg.exception_address).szModule
if dbg.bp_is_ours_mem(self.address):
off = dbg.violation_address - self.address
exists = False
print "[*] Hit @ 0x%08x offset 0x%04x" % (dbg.violation_address, off)
# Do the offset creation
for o in xrange(0, len(self.offsets)):
if self.offsets[o].offset == off:
offset = self.offsets[o]
offset.data = dbg.read_process_memory(dbg.violation_address, 1)
exists = True
break
if not exists:
offset = Offset(self, off)
offset.orig_data = dbg.read_process_memory(dbg.violation_address, 1)
offset.data = offset.orig_data
dbgexcept = DbgException(dbg)
offset.last_exception_id = dbgexcept.id
if dbgexcept.direction == "read":
offset.read_count += 1
offset.last_read = dbgexcept.address
else:
offset.write_count += 1
offset.last_write = dbgexcept.address
offset.last_module = dbgexcept.module
print "[*] [%s!0x%08x] %s [%s]" % (offset.last_module, dbgexcept.address, dbg.disasm(dbgexcept.address), dbgexcept.direction)
offset.mod_addr = dbgexcept.address + dbg.instruction.length
offset.dbg_exceptions.append(dbgexcept)
# Store the new offset
if not exists:
self.offsets.append(offset)
else:
self.offsets[o] = offset
# Get the modification data
dbg.set_callback(EXCEPTION_SINGLE_STEP, offset.handler)
dbg.single_step(True)
return DBG_CONTINUE
def render_text(self, dbg, path, offsets=True):
filename = "%s.%x" % (path, self.address)
try:
fh = open(filename + ".txt", "w")
except:
print "[!] Problem offset structure %s" % filename
sys.exit(-1)
fh.write("\nStructure [0x%08x]:\n" % self.address)
fh.write("=" * 72)
fh.write("\nAddress: 0x%08x\n" % self.address)
fh.write("Size: %d\n" % self.size)
fh.write("\n")
for offset in self.offsets:
fh.write("Offset: 0x%08x\n" % offset.offset)
offset.render_text(dbg, filename)
fh.write("\n\n")
fh.close()
def print_dump_html(self, fh, data):
counter = 0
pos = 0
bold = False
for char in data:
for off in self.offsets:
if off.offset == pos:
bold = True
break
else:
bold = False
if counter == 0:
fh.write("0x%08x: " % pos)
counter += 1
if counter == 8:
if bold:
fh.write("<b>0x%02x</b> " % ord(char))
else:
fh.write("0x%02x " % ord(char))
counter += 1
elif counter < 16:
if bold:
fh.write("<b>0x%02x</b> " % ord(char))
else:
fh.write("0x%02x " % ord(char))
counter += 1
else:
if bold:
fh.write("<b>0x%02x</b> " % ord(char))
else:
fh.write("0x%02x " % ord(char))
while counter > 0:
char = data[pos - counter]
if counter == 8:
if char in string.printable:
fh.write("%c " % char)
else:
fh.write(". ")
counter -= 1
elif counter > 0:
if char in string.printable:
fh.write("%c" % char)
else:
fh.write(".")
counter -= 1
else:
if char in string.printable:
fh.write("%c<br>" % char)
else:
fh.write(".<br>")
counter = 0
fh.write("<br>")
pos += 1
if counter:
fh.write(" " * (80 - (counter * 5) + 5 + 1))
if counter <= 8:
fh.write(" ")
while counter > 0:
char = data[pos - counter]
if counter == 8:
if char in string.printable:
fh.write("%c " % char)
else:
fh.write(". ")
counter -= 1
elif counter > 0:
if char in string.printable:
fh.write("%c" % char)
else:
fh.write(".")
counter -= 1
else:
if char in string.printable:
fh.write("%c<br>" % char)
else:
fh.write(".<br>")
counter = 0
fh.write("<br>")
def render_html(self, dbg, path, offsets=True):
filename = "%s.%x" % (path, self.address)
try:
fh = open(filename + ".html", "w")
except:
print "[!] Problem offset structure %s" % filename
sys.exit(-1)
fh.write("<html><head><title>Structure 0x%08x</title></head><body><br>" % self.address)
fh.write("\n<h2>Structure [0x%08x]:<br></h2>" % self.address)
fh.write("=" * 72)
fh.write("<br>Address: 0x%08x<br>" % self.address)
fh.write("Size: %d<br>" % self.size)
fh.write("<br>")
fh.write("<table cellpadding=10><tr><td>")
fh.write(" ")
self.offsets.sort(cmp=numeri)
for offset in self.offsets:
fh.write("Offset: <a href=\"%s.%x.html\">0x%08x</a><br>" % (filename.split('/')[-1], offset.offset, offset.offset))
offset.render_html(dbg, filename)
fh.write("</td><td>")
for offset in self.offsets:
fh.write("[0x%02x] -> [0x%02x]<br>" % (struct.unpack("<B", offset.orig_data)[0], struct.unpack("<B", offset.data)[0]))
fh.write("</td><td>")
fh.write("<b>Before</b><br>")
fh.write("<pre>")
self.print_dump_html(fh, self.orig_data)
fh.write("</pre>")
fh.write("<br>")
fh.write("<b>After</b><br>")
fh.write("<pre>")
self.print_dump_html(fh, self.data)
fh.write("</pre>")
fh.write("</td></tr></table>")
fh.write("<br>")
fh.write("</body></html>")
fh.close()
def display(self, dbg, offsets=True):
print "\nStructure [0x%08x]:"
print "=" * 72
print "Address: 0x%08x" % self.address
print "Size: %d" % self.size
print "\n"
for offset in self.offsets:
if offset.write_count > 0:
offset.display(dbg)
print "\n\n"
######################################################################
#
# Our function breakpoint handlers
#
######################################################################
def handler_breakpoint(dbg):
if dbg.first_breakpoint:
# We need to set our code bp
print "[*] Setting bp @ 0x%08x" % dbg.args["address"]
# Might want to keep this but not for now
dbg.bp_set(dbg.args["address"], restore=False, handler=handler_our_breakpoint)
return DBG_CONTINUE
return DBG_CONTINUE
def handler_our_breakpoint(dbg):
if dbg.exception_address != dbg.args["address"]:
return DBG_CONTINUE
register = dbg.args["register"]
value = get_register(dbg, register)
if not value:
print "[!] Problem getting %s" % register
return DBG_CONTINUE
print "[*] Hit code bp @ [0x%08x] %s = 0x%08x" % (dbg.exception_address, register, value)
print "[*] Creating Structure(0x%08x, %d)" % (value, dbg.args["size"])
dbg.structure = Structure(value, dbg.args["size"], dbg.args["timestamp"])
dbg.structure.orig_data = dbg.read_process_memory(dbg.structure.address, dbg.structure.size)
print "[*] Setting mem bp @ 0x%08x size %d" % (dbg.structure.address, dbg.structure.size)
dbg.bp_set_mem(dbg.structure.address, dbg.structure.size, handler=dbg.structure.handler)
return DBG_CONTINUE
######################################################################
#
# Various utility routines
#
######################################################################
def get_register(dbg, register):
context = dbg.get_thread_context(dbg.h_thread)
if register == "EAX": return context.Eax
elif register == "EBX": return context.Ebx
elif register == "ECX": return context.Ecx
elif register == "EDX": return context.Edx
elif register == "ESI": return context.Esi
elif register == "EDI": return context.Edi
elif register == "ESP": return context.Esp
elif register == "EBP": return context.Ebp
elif register == "EIP": return context.Eip
else: return False
return False
def numeri(x, y):
x = x.offset
y = y.offset
if x < y: return -1
elif x == y: return 0
else: return 1
######################################################################
#
# Various set up routines before exection
#
######################################################################
def attach_target_proc(dbg, procname):
imagename = procname.rsplit('\\')[-1]
print "[*] Trying to attach to existing %s" % imagename
for (pid, name) in dbg.enumerate_processes():
if imagename in name:
try:
print "[*] Attaching to %s (%d)" % (name, pid)
dbg.attach(pid)
except:
print "[!] Problem attaching to %s" % name
return False
return True
try:
print "[*] Trying to load %s %s" % (procname)
dbg.load(procname, "")
except:
print "[!] Problem loading %s" % (procname)
return False
return True
def exitfunc(dbg):
print "[!] Exiting"
if dbg:
print "[!] Cleaning up pydbg"
if hasattr(dbg, "structure"):
#dbg.structure.display(dbg)
dbg.structure.data = dbg.read_process_memory(dbg.structure.address, dbg.structure.size)
dbg.structure.render_html(dbg, "test" + "/" + dbg.args["timestamp"])
dbg.cleanup()
dbg.detach()
sys.exit(0)
######################################################################
#
# Static variables
#
######################################################################
filters = ["kernel32.dll", "user32.dll", "msvcrt.dll", "ntdll.dll"]
dbg = ""
######################################################################
#
# Command line arguments
#
######################################################################
# track.py dps.exe 0x006AC928 ebx 256 [read|write|both]*
if len(sys.argv) < 5:
print "Usage: %s <process name> <address of bp> <register> <size of struct>" % sys.argv[0]
sys.exit(-1)
procname = sys.argv[1]
address = string.atol(sys.argv[2], 0)
register = sys.argv[3].upper()
size = int(sys.argv[4])
timestamp = time.strftime("%m%d%Y%H%M%S", time.localtime())
dbg = pydbg()
dbg.procname = procname
dbg.args = {"address":address, "register":register, "size":size, "timestamp":timestamp}
dbg.set_callback(EXCEPTION_BREAKPOINT, handler_breakpoint)
atexit.register(exitfunc, dbg)
if not attach_target_proc(dbg, procname):
print "[!] Couldnt load/attach to %s" % procname
sys.exit(-1)
dbg.debug_event_loop()