forked from arbor/reversing
/
find_byte_strings.py
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/
find_byte_strings.py
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# Author: Jason Jones, Arbor Networks ASERT
########################################################################
# Copyright 2013 Arbor Networks
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
########################################################################
from idaapi import *
from idc import *
from idautils import *
import ctypes
from PySide import QtGui, QtCore
class ByteStringsViewer_t(PluginForm):
def Show(self):
return PluginForm.Show(self,"Byte Strings",options = PluginForm.FORM_PERSIST)
def OnCreate(self,form):
self.parent = self.FormToPySideWidget(form)
self.byte_strings = {}
self.table = QtGui.QTableWidget()
self.table.setRowCount(1)
self.table.setColumnCount(3)
self.table.setHorizontalHeaderLabels(("Address","Function","String"))
layout = QtGui.QVBoxLayout()
layout.addWidget(self.table)
self.clipboard = QtGui.QClipboard()
self.Create()
self.parent.setLayout(layout)
def OnClose(self,form):
global ByteStringForm
del ByteStringForm
print "Closed"
def click_row(self):
i = self.table.item(self.table.currentRow(),0)
bstr = self.table.item(self.table.currentRow(),2)
print self.table.currentRow()
addr = i.text().strip()
bstr = bstr.text()
print bstr
print addr
if not addr.startswith("0x"):
addr = get_name_ea(BADADDR,str(addr))
else:
addr = addr[2:10]
addr= int(addr,16)
Jump(addr)
self.clipboard.setText(bstr)
return
def Create(self):
title = "Byte Strings"
self.table.clear()
self.table.setColumnCount(3)
self.table.setHorizontalHeaderLabels(("Address","Function","String"))
self.table.itemClicked.connect(self.click_row)
self.find_byte_strings()
self.table.setRowCount(len(self.byte_strings.keys()))
row = 0
for addr,bstr in self.byte_strings.items():
self.table.setItem(row,0,QtGui.QTableWidgetItem(addr))
self.table.setItem(row,1,QtGui.QTableWidgetItem(get_func_name(int(addr[2:],16))))
self.table.setItem(row,2,QtGui.QTableWidgetItem(bstr))
self.table.resizeRowToContents(row)
row += 1
self.table.setSortingEnabled(True)
def find_byte_strings(self):
#chrs = {}
for f in Functions():
func = get_func(f)
chr_vals = {}
eightbit = {}
for head in Heads(func.startEA,func.endEA):
if GetMnem(head) == "mov":
if re.match('[abcd]l',GetOpnd(head,0)) and GetOpType(head,1) == o_imm and ((GetOperandValue(head,1) >= 0x20 and GetOperandValue(head,1) <= 0x7f) or GetOperandValue(head,1) in [0xd,0xa]):
eightbit[GetOpnd(head,0)] = GetOperandValue(head,1)
if (GetOpnd(head,0).startswith('byte ptr') or GetOpnd(head,0).startswith('[e')) and GetOpType(head,1) == o_imm and ((GetOperandValue(head,1) >= 0x20 and GetOperandValue(head,1) <= 0x7f) or GetOperandValue(head,1) in [0xd,0xa]):
reg = GetOpnd(head,0)
reg = reg[reg.find('['):]
if reg.count('+') == 0: offset = 0
else:
ops = reg.split('+')
reg = reg[:reg.find('+')]+']'
offset = ctypes.c_int32(GetOperandValue(head,0)).value
reg_base=0
if len(ops) > 2 and ops[1].endswith('h'):
reg_base = int(ops[1][:-1],16)
offset = offset-reg_base
if reg not in chr_vals: chr_vals[reg] = {}
chr_vals[reg][offset] = (head,chr(GetOperandValue(head,1)))
elif (GetOpnd(head,0).startswith('byte ptr') or GetOpnd(head,0).startswith('[e')) and GetOpType(head,1) == o_reg and GetOpnd(head,1) in eightbit:
reg = GetOpnd(head,0)
reg = reg[reg.find('['):]
if reg.count('+') == 0: offset = 0
else:
ops = reg.split('+')
reg = reg[:reg.find('+')]+']'
offset = ctypes.c_int32(GetOperandValue(head,0)).value
reg_base=0
if len(ops) > 2 and ops[1].endswith('h'):
reg_base = int(ops[1][:-1],16)
offset = offset-reg_base
if reg not in chr_vals: chr_vals[reg] = {}
chr_vals[reg][offset] = (head,chr(eightbit[GetOpnd(head,1)]))
for reg,c_v in chr_vals.items():
keys = c_v.keys()
keys.sort()
last = None
s = ""
offset = 0
for o in keys:
if last is None:
addr = c_v[o][0]
offset = o
s = c_v[o][1]
elif last + 1 == o and c_v[o] != '\x00':
s += c_v[o][1]
else:
if s != "" and len(s) > 3:
self.byte_strings["0x%X" % addr] = s
func = get_func(addr)
if offset > 0:
s = ""
continue
s = c_v[o][1]
offset = o
addr = c_v[o][0]
last = o
if s != "" and len(s) > 1:
self.byte_strings["0x%X" % addr] = s
func = get_func(addr)
def find_all_byte_strings():
global ByteStringForm
ByteStringForm = ByteStringsViewer_t()
ByteStringForm.Show()
ByteStringForm.table.resizeRowsToContents()
ByteStringForm.table.resizeColumnsToContents()
find_all_byte_strings()