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kl_vbs_disasm_ida.py
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kl_vbs_disasm_ida.py
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# VBScript VM disassembler
#
# Author: Boris Larin - https://twitter.com/oct0xor
#
# 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/>.
#
# HOW TO:
# 1) Set bp at vbscript!CScriptRuntime::RunNoEH
# 2) Run
# 3) After bp is hit, launch script
# 4) ...
import sys, os, struct
import idc
class instr:
def __init__(self, argsize, name, argfmt):
self.argsize = argsize
self.name = name
self.argfmt = argfmt
def get_int8(pos):
return struct.unpack("b", struct.pack("B", Byte(pos)))[0]
def get_uint8(pos):
return Byte(pos)
def get_int16(pos):
return struct.unpack("h", struct.pack("H", Word(pos)))[0]
def get_uint16(pos):
return Word(pos)
def get_int32(pos):
return struct.unpack("i", struct.pack("I", Dword(pos)))[0]
def get_uint32(pos):
return Dword(pos)
def get_uint64(pos):
return Qword(pos)
def get_type0(addr, pos):
arg0 = get_uint8(pos)
return " %d" % arg0
def get_type1(addr, pos):
arg0 = get_uint16(pos)
return " %d" % arg0
def get_type2(addr, pos):
arg0 = get_int8(pos)
return " %d" % arg0
def get_type3(addr, pos):
arg0 = get_uint32(pos)
return " %ld" % arg0
def get_type4(addr, pos):
arg0 = get_int16(pos)
return " %d" % arg0
def get_type5(addr, pos):
arg0 = get_uint16(pos)
return " %d" % arg0
def get_type6(addr, pos):
arg0 = get_strlit_contents(addr + get_uint32(pos), -1, STRTYPE_C_16)
return " '%s'" % arg0
def get_type7(addr, pos):
arg0 = get_uint32(pos)
return " %04X" % arg0
def get_type8(addr, pos):
arg0 = get_uint64(pos)
return " %.17g" % arg0
def get_type9(addr, pos):
arg0 = get_int16(pos)
arg1 = get_uint16(pos+2)
return " %d %d" % (arg0, arg1)
def get_type10(addr, pos):
arg0 = get_int16(pos)
arg1 = get_int16(pos+2)
return " %d %d" % (arg0, arg1)
def get_type11(addr, pos):
arg0 = get_strlit_contents(addr + get_uint32(pos), -1, STRTYPE_C_16)
arg1 = get_uint8(pos+4)
if (arg1 == 0):
return " '%s' FALSE" % arg0
else:
return " '%s' TRUE" % arg0
def get_type12(addr, pos):
arg0 = get_strlit_contents(addr + get_uint32(pos), -1, STRTYPE_C_16)
arg1 = get_uint16(pos+4)
return " '%s' %d" % (arg0, arg1)
def get_type13(addr, pos):
arg0 = get_int16(pos)
arg1 = get_int16(pos+2)
arg2 = get_int16(pos+4)
return " %d %d %d" % (arg0, arg1, arg2)
def get_type14(addr, pos):
arg0 = get_strlit_contents(addr + get_uint32(pos), -1, STRTYPE_C_16)
arg1 = get_int16(pos+4)
arg2 = get_int16(pos+6)
return " '%s' %d %d" % (arg0, arg1, arg2)
def get_type15(addr, pos):
arg0 = get_strlit_contents(addr + get_uint32(pos), -1, STRTYPE_C_16)
arg1 = get_uint32(pos+4)
arg2 = get_uint8(pos+8)
if (arg2 == 0):
return " '%s' %u FALSE" % (arg0, arg1)
else:
return " '%s' %u TRUE" % (arg0, arg1)
def get_type16(addr, pos):
arg0 = get_strlit_contents(addr + get_uint32(pos), -1, STRTYPE_C_16)
arg1 = get_int16(pos+4)
arg2 = get_uint8(pos+6)
if (arg2 == 0):
return " '%s' %d FALSE" % (arg0, arg1)
else:
return " '%s' %d TRUE" % (arg0, arg1)
# Total = 0x6F
vbs_itable = {
0x00: instr(0, "OP_None", None),
0x01: instr(0, "OP_FuncEnd", None),
0x02: instr(0, "OP_Bos0", None),
0x03: instr(1, "OP_Bos1", get_type0),
0x04: instr(2, "OP_Bos2", get_type1),
0x05: instr(4, "OP_Bos4", get_type3),
0x06: instr(4, "OP_DebugBreak", get_type3),
0x07: instr(4, "OP_ArrLclDim", get_type9),
0x08: instr(4, "OP_ArrLclReDim", get_type9),
0x09: instr(6, "OP_ArrNamDim", get_type12),
0x0A: instr(6, "OP_ArrNamReDim", get_type12),
0x0B: instr(1, "OP_IntConst", get_type2),
0x0C: instr(4, "OP_LngConst", get_type3),
0x0D: instr(8, "OP_FltConst", get_type8),
0x0E: instr(4, "OP_StrConst", get_type6),
0x0F: instr(8, "OP_DateConst", get_type8),
0x10: instr(0, "OP_False", None),
0x11: instr(0, "OP_True", None),
0x12: instr(0, "OP_Null", None),
0x13: instr(0, "OP_Empty", None),
0x14: instr(0, "OP_NoArg", None),
0x15: instr(0, "OP_Nothing", None),
0x16: instr(5, "OP_ConstSt", get_type11),
0x17: instr(0, "OP_UNK_17", None),
0x18: instr(2, "OP_LocalLd", get_type4),
0x19: instr(2, "OP_LocalAdr", get_type4),
0x1A: instr(2, "OP_LocalSt", get_type4),
0x1B: instr(2, "OP_LocalSet", get_type4),
0x1C: instr(4, "OP_NamedLd", get_type6),
0x1D: instr(4, "OP_NamedAdr", get_type6),
0x1E: instr(4, "OP_NamedSt", get_type6),
0x1F: instr(4, "OP_NamedSet", get_type6),
0x20: instr(0, "OP_ThisLd", None),
0x21: instr(0, "OP_ThisSt", None),
0x22: instr(0, "OP_ThisSet", None),
0x23: instr(4, "OP_MemLd", get_type6),
0x24: instr(4, "OP_MemSt", get_type6),
0x25: instr(4, "OP_MemSet", get_type6),
0x26: instr(6, "OP_CallNmdLd", get_type12),
0x27: instr(6, "OP_CallNmdVoid", get_type12),
0x28: instr(6, "OP_CallNmdAdr", get_type12),
0x29: instr(6, "OP_CallNmdSt", get_type12),
0x2A: instr(6, "OP_CallNmdSet", get_type12),
0x2B: instr(4, "OP_CallLclLd", get_type9),
0x2C: instr(4, "OP_CallLclVoid", get_type9),
0x2D: instr(4, "OP_CallLclAdr", get_type9),
0x2E: instr(4, "OP_CallLclSt", get_type9),
0x2F: instr(4, "OP_CallLclSet", get_type9),
0x30: instr(6, "OP_CallMemLd", get_type12),
0x31: instr(6, "OP_CallMemVoid", get_type12),
0x32: instr(6, "OP_CallMemSt", get_type12),
0x33: instr(6, "OP_CallMemSet", get_type12),
0x34: instr(2, "OP_CallIndLd", get_type5),
0x35: instr(2, "OP_CallIndVoid", get_type5),
0x36: instr(2, "OP_CallIndAdr", get_type5),
0x37: instr(2, "OP_CallIndSt", get_type5),
0x38: instr(2, "OP_CallIndSet", get_type5),
0x39: instr(0, "OP_Asg", None),
0x3A: instr(4, "OP_Jmp", get_type7),
0x3B: instr(4, "OP_JccTrue", get_type7),
0x3C: instr(4, "OP_JccFalse", get_type7),
0x3D: instr(0, "OP_Neg", None),
0x3E: instr(0, "OP_BitOr", None),
0x3F: instr(0, "OP_BitXor", None),
0x40: instr(0, "OP_BitAnd", None),
0x41: instr(0, "OP_BitNot", None),
0x42: instr(0, "OP_EQ", None),
0x43: instr(0, "OP_NE", None),
0x44: instr(0, "OP_LT", None),
0x45: instr(0, "OP_LE", None),
0x46: instr(0, "OP_GT", None),
0x47: instr(0, "OP_GE", None),
0x48: instr(0, "OP_Add", None),
0x49: instr(0, "OP_Sub", None),
0x4A: instr(0, "OP_Mul", None),
0x4B: instr(0, "OP_Div", None),
0x4C: instr(0, "OP_Mod", None),
0x4D: instr(0, "OP_Eqv", None),
0x4E: instr(0, "OP_Pow", None),
0x4F: instr(0, "OP_Imp", None),
0x50: instr(0, "OP_Is", None),
0x51: instr(0, "OP_Like", None),
0x52: instr(0, "OP_Conc", None),
0x53: instr(0, "OP_Idiv", None),
0x54: instr(0, "OP_FixType", None),
0x55: instr(9, "OP_FnBind", get_type15),
0x56: instr(7, "OP_VarBind", get_type16),
0x57: instr(0, "OP_FnReturn", None),
0x58: instr(0, "OP_FnReturnEx", None),
0x59: instr(0, "OP_Pop", None),
0x5A: instr(4, "OP_InitClass", get_type6),
0x5B: instr(4, "OP_CreateClass", get_type6),
0x5C: instr(9, "OP_FnBindEx", get_type15),
0x5D: instr(5, "OP_CreateVar", get_type11),
0x5E: instr(6, "OP_CreateArr", get_type12),
0x5F: instr(0, "OP_WithPush", None),
0x60: instr(0, "OP_WithPop", None),
0x61: instr(0, "OP_WithPop2", None),
0x62: instr(6, "OP_ForInitLocal", get_type13),
0x63: instr(6, "OP_ForNextLocal", get_type13),
0x64: instr(8, "OP_ForInitNamed", get_type14),
0x65: instr(8, "OP_ForNextNamed", get_type14),
0x66: instr(1, "OP_OnError", get_type2),
0x67: instr(4, "OP_CaseEQ", get_type7),
0x68: instr(4, "OP_CaseNE", get_type7),
0x69: instr(6, "OP_ForInBegLcl", get_type13),
0x6A: instr(6, "OP_ForInNxtLcl", get_type13),
0x6B: instr(8, "OP_ForInBegNmd", get_type14),
0x6C: instr(8, "OP_ForInNxtNmd", get_type14),
0x6D: instr(4, "OP_ForInPop", get_type10),
0x6E: instr(0, "OP_UNK_6E", None),
0x6F: instr(0, "OP_UNK_6F", None),
}
def pprint(indent_level, text):
print(" " * indent_level + text)
def print_list(indent_level, addr, kind, count, list_ptr, start_id):
pprint(indent_level, "%s count = %d" % (kind, count))
if (list_ptr):
indent_level += 1
for i in range(count):
name_pos = get_uint32(list_ptr + 8 * i)
flags = get_uint32(list_ptr + 8 * i + 4)
if (start_id):
string = "%s %3d =" % (kind, start_id * (i + 1))
else:
string = "%s =" % kind
if (start_id >= 0):
if (start_id):
string += " "
elif (flags & 2):
string += " pri"
else:
string += " pub"
elif (flags & 0x200):
string += " ref"
else:
string += " val"
if (flags & 0x100):
string += " Variant ()"
else:
string += " Variant "
string += " '%s'" % get_strlit_contents(addr + name_pos, -1, STRTYPE_C_16)
pprint(indent_level, string)
def print_info(indent_level, addr, pfnc, func_id):
name_pos = get_uint32(pfnc)
stack = get_uint32(pfnc + 4)
if (func_id):
if (name_pos):
name = get_strlit_contents(addr + name_pos, -1, STRTYPE_C_16)
pprint(indent_level, "Function %d ('%s') [max stack = %u]:" % (func_id, name, stack))
else:
pprint(indent_level, "Function %d [max stack = %u]:" % (func_id, stack))
else:
pprint(indent_level, "Global code [max stack = %u]:" % stack)
indent_level += 1
flags = get_uint32(pfnc + 44)
if (flags):
string = "flags = (%04lX)" % flags
if (flags & 0x8000):
string += " noconnect"
if (flags & 0x4000):
string += " sub"
if (flags & 0x2000):
string += " explicit"
if (flags & 2):
string += " private"
pprint(indent_level, string)
arg_count = get_int16(pfnc + 36)
arg_addr = pfnc + 48
if (func_id or arg_count > 0):
print_list(indent_level, addr, "arg", arg_count, arg_addr, -1)
lcl_count = get_int16(pfnc + 38)
lcl_addr = arg_addr + 8 * arg_count
if (func_id or lcl_count > 0):
print_list(indent_level, addr, "lcl", lcl_count, lcl_addr, 1)
tmp_count = get_int16(pfnc + 40)
if (tmp_count > 0):
print_list(indent_level, addr, "tmp", tmp_count, 0, 1)
def print_code(indent_level, addr, pfnc, bos_info, bos_data):
code_start = addr + get_uint32(pfnc + 8)
code_end = code_start + get_uint32(pfnc + 0xC)
bos_info += get_uint32(pfnc + 0x10) * 8
pprint(indent_level, "Pcode:")
indent_level += 1
position = code_start
while (position < code_end):
opcode = get_uint8(position)
if opcode in (3,4,5):
if (opcode == 3):
value = get_uint8(position + 1)
elif (opcode == 4):
value = get_uint16(position + 1)
elif (opcode == 5):
value = get_uint32(position + 1)
bos_info_pos = bos_info + 8 * value
bos_start = get_uint32(bos_info_pos)
bos_length = get_uint32(bos_info_pos + 4)
string = "***BOS(%ld,%ld)***" % (bos_start, bos_start + bos_length)
if (bos_data):
string += " %s *****" % get_strlit_contents(bos_data + 2 * bos_start, bos_length * 2, STRTYPE_C_16)
pprint(indent_level, string)
set_cmt(position, string, 0)
string = "%04X " % (position - code_start)
if (opcode >= 0x6F):
string += "ERROR(%u)" % opcode
break
string += "%-16s" % vbs_itable[opcode].name
if (vbs_itable[opcode].argfmt is not None):
string += vbs_itable[opcode].argfmt(addr, position + 1)
pprint(indent_level, string)
if opcode not in (3,4,5):
set_cmt(position, string, 0)
position += 1 + vbs_itable[opcode].argsize
def dump(addr):
funcs = addr + get_uint32(addr + 0x10)
funcs_count = get_uint32(addr + 0x14)
bos_info = addr + get_uint32(addr + 0x1C)
bos_data = addr + get_uint32(addr + 0x28)
for i in range(funcs_count):
pfnc = addr + get_uint32(funcs + i * 4)
print_info(1, addr, pfnc, i)
print_code(1, addr, pfnc, bos_info, bos_data)
print
dump(Dword(get_reg_value("ECX")+0xC0))