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peacestone.py
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peacestone.py
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from qiling import *
from qiling.const import *
from capstone import *
from keystone import *
from subprocess import run, PIPE
import pefile
import json
import re
import os
import sys
import struct
BIN_NAME = sys.argv[1]
# These magic regexes are derived from the byte markers in notes.txt
PUSH_REGEX = rb"(?:\x8dd\$\xfc\x89[\x04\x0c\x14\x1c,4<]\$|[PQRSUVW]){2}\x8d[x\x05\r\x15\x1d-5=].{4}"
STUB_RET4_REGEX = rb"\x8b[DLT\\lt\|]\$\x04\xc2\x04\x00"
STUB_RET0_REGEX = rb"\x87[\x04\x0c\x14\x1c,4<]\$\xc3"
REG_NAMES = {
19: "EAX",
20: "EBP",
21: "EBX",
22: "ECX",
23: "EDI",
24: "EDX",
29: "ESI"
}
INDIR_REGS = ["ECX", "EDI", "EBX", "EBP", "ESP", "EAX", "ESI", "EDX"]
ks = Ks(KS_ARCH_X86, KS_MODE_32)
md = Cs(CS_ARCH_X86, CS_MODE_32)
md.detail = True
md.skipdata = True
ql = Qiling([f"./{BIN_NAME}"], ".", verbose=QL_VERBOSE.DISABLED)
image_start = ql.loader.images[0].base
image_end = ql.loader.images[0].end
image_size = image_end - image_start
pe = pefile.PE(data=ql.mem.read(image_start, image_size))
scratch_base = ql.mem.map_anywhere(0x1000)
def load_syms():
text = run(["llvm-pdbutil", "pretty", "-externals", BIN_NAME.replace(".dll", ".pdb").replace(".exe", ".pdb"), f"-load-address={hex(image_start)}"], stdout=PIPE).stdout.decode("utf-8")
symdata = re.findall(r" public \[(\w+)\] (\S+)", text, re.MULTILINE)
addrs = []
unique_syms = []
for addr, sym in symdata:
if addr not in addrs:
unique_syms.append((int(addr, 16), sym))
addrs.append(addr)
unique_syms = dict(unique_syms)
return unique_syms
sym_data = load_syms()
sym_data_inv = {b: a for a, b in sym_data.items()}
sym_addrs = sorted(sym_data)
def mem_read_int(addr):
return ql.unpack(ql.mem.read(addr, 4))
def array_read_int(array, offset):
return int.from_bytes(array[offset:offset+4], "little")
def array_write_int(array, offset, val):
arr_copy = list(array)
val_bytes = val.to_bytes(4, "little")
for i in range(4):
arr_copy[offset + i] = val_bytes[i]
return arr_copy
def assemble(instrs):
return bytes(ks.asm(instrs)[0])
num_obd = mem_read_int(sym_data_inv["?g_nNumObfuscatedBlockData@WARBIRD@@3KA"])
obd_addr = sym_data_inv["?g_ObfuscatedBlockData@WARBIRD@@3PAU_OBFUSCATED_BLOCK_DATA@1@A"]
obd = []
for i in range(num_obd):
obf_block = []
for j in range(5):
obf_block.append(mem_read_int(obd_addr + 4*(5*i + j)))
obd.append(obf_block)
num_relocs = mem_read_int(sym_data_inv["?g_PrivateRelocationsTable@WARBIRD@@3VCPrivateRelocationsTable@1@B"])
reloc_addr = sym_data_inv["?g_PrivateRelocationsTable@WARBIRD@@3VCPrivateRelocationsTable@1@B"] + 4
private_relocs = []
for i in range(num_relocs):
private_relocs.append(mem_read_int(reloc_addr + 4*i))
obfu_code_table = {}
obfu_ctrlflow = []
for target in range(num_obd):
first = 0
first_prev = 0
last = num_obd - 1
last_prev = num_obd - 1
sum_diff = 0
while True:
index = (first + last) // 2
xor_value = obd[index][0] ^ sum_diff
if index <= target:
if index != target:
first = index + 1
last = last_prev
first_prev = first
sum_diff = (obd[index][0] - obd[index][3]) % (1 << 32)
else:
break
else:
last = index - 1
last_prev = last
sum_diff = (obd[index][0] + obd[index][3]) % (1 << 32)
if first > last:
raise Exception("???")
addr = image_start + xor_value
val1 = (obd[index][1] + obd[index][0]) % (1 << 32)
val2 = (obd[index][2] - obd[index][0]) % (1 << 32)
val3 = (obd[index][4] + obd[index][3]) % (1 << 32)
unk3 = obd[index][3]
cont_mode = (unk3 >> 12) & 0x7F
data_size = unk3 & 0xfff
if cont_mode in [0x0B, 0x10, 0x13, 0x16, 0x33, 0x38, 0x45, 0x74]:
# INDIRECT JUMP
param1 = (unk3 >> 18) & 0x3F00 | (unk3 >> 12) & 0x80 | cont_mode & 0xFFF0007F | ((unk3 & 0x100000 | ((unk3 & 0x1E00000 | (unk3 >> 5) & 0x100000) >> 5)) >> 1)
param2 = val3
obfu_ctrlflow.append((addr, param1, param2))
elif cont_mode in [0x19, 0x2F, 0x58, 0x63]:
# RETURN
obfu_ctrlflow.append((addr, 0, 0))
else:
# DIRECT JUMP
addr0 = image_start + xor_value + data_size
addr1 = image_start + val3
obfu_ctrlflow.append((addr, addr0, addr1))
obfu_code_table[addr] = (index, val1, val2, val3, unk3)
def decrypt_code(ecstart, start_offset=0, print_code=False):
# print("DECRYPTING CODE @ " + hex(ecstart) + " OFFSET " + hex(start_offset))
ecstart_offset = ecstart - image_start
index, val1, val2, val3, unk3 = obfu_code_table[ecstart]
data_size = unk3 & 0xfff
enc_bytes = ql.mem.read(ecstart, data_size + 1)
dec_bytes = [0] * data_size
chksum = 0xa5
if val2 & 0x1000000 == 0:
# print("DERIVING KEY FROM MAC")
mac_func = mem_read_int(sym_data_inv["?g_apMacFuncs@WARBIRD@@3PAP6AXAA_JPBE1ABU_CBCKey2@1@@ZA"] + (val2 >> 25) * 4)
for instr in md.disasm(ql.mem.read(mac_func, 0x100), mac_func):
if instr.mnemonic == "ret":
mac_end = instr.address
break
old_sp = ql.arch.regs.esp
ql.mem.write(scratch_base, b"\x00\x01\x02\x03\x04\x05")
ql.mem.write(scratch_base + 0x10, ql.pack(ecstart_offset))
ql.mem.write(scratch_base + 0x14, ql.pack(0))
ql.arch.stack_push(scratch_base)
ql.arch.stack_push(val1 + image_start + (val2 & 0xffff))
ql.arch.stack_push(val1 + image_start)
ql.arch.stack_push(0x10)
ql.arch.stack_push(0x69696969)
ql.run(begin=mac_func, end=mac_end)
ql.arch.regs.esp = old_sp
key1 = ql.mem.read(0x10, 4)
key2 = ql.mem.read(0x14, 2)
else:
# print("USING BLOCK VALUES AS KEY")
key1 = val1.to_bytes(4, "little")
key2 = (val2 & 0xFFFF).to_bytes(2, "little")
for i in range(data_size - 1, -1, -1):
enc_byte = enc_bytes[i]
if i > 0:
b = enc_bytes[i - 1]
else:
b = 0
if i % 2 == 1:
if (enc_byte ^ key1[3]) % 2 == 1:
a = (enc_byte ^ key1[3] ^ key1[2] ^ 0x100) >> 1
else:
a = (enc_byte ^ key1[3]) >> 1
if (a ^ b) % 2 == 1:
dec_byte = (a ^ b ^ key2[1] ^ 0x100) >> 1
else:
dec_byte = (a ^ b) >> 1
else:
if (enc_byte ^ key1[1]) % 2 == 1:
a = (enc_byte ^ key1[1] ^ key1[0] ^ 0x100) >> 1
else:
a = (enc_byte ^ key1[1]) >> 1
if (a ^ b) % 2 == 1:
dec_byte = (a ^ b ^ key2[0] ^ 0x100) >> 1
else:
dec_byte = (a ^ b) >> 1
chksum ^= dec_byte
dec_bytes[i] = dec_byte
if chksum != (val2 >> 16) & 0xFF:
raise Exception("CHECKSUM FAILED!")
# print(dec_bytes)
first = 0
last = num_relocs - 1
while last >= first:
index = (first + last) // 2
addr = private_relocs[index] & 0xFFFFFFF
if ecstart_offset >= addr:
if ecstart_offset == addr:
first = (first + last) // 2
break
first = index + 1
else:
last = index - 1
index = first
while index < num_relocs:
addr = private_relocs[index] & 0xFFFFFFF
if addr >= (ecstart_offset + data_size):
break
offset = 0
ofmode = (private_relocs[index] >> 28) & 3
if ofmode == 1:
offset = -ecstart % (1 << 32)
elif ofmode == 2:
offset = ecstart
if ((private_relocs[index] >> 30) & 3) == 2 and offset != 0:
# print(f"RELOC @ OFFSET {hex(addr - ecstart_offset)} +{hex(offset)}")
val = array_read_int(dec_bytes, addr - ecstart_offset)
val = (val + offset - start_offset) % (1 << 32)
dec_bytes = array_write_int(dec_bytes, addr - ecstart_offset, val)
# print(dec_bytes)
index += 1
dec_bytes = bytes(dec_bytes)
if print_code:
for instr in md.disasm(dec_bytes, start_offset):
print(instr)
return dec_bytes
def nearest_block(caddr):
try:
return list(filter(lambda a: a <= caddr, obfu_code_table))[-1]
except:
raise Exception(hex(caddr))
def deobfu_func(ecstart, start_offset=0, print_code=False):
# print("DEOBFUSCATING CODE @ " + hex(ecstart))
ecstart_offset = ecstart - image_start
index, val1, val2, val3, unk3 = obfu_code_table[ecstart]
addr = obfu_ctrlflow[index][0]
# control flow is given as list of graph nodes
# indirect jump and return nodes are treated as having no children
visited_blocks = [addr]
queue = [addr]
while len(queue) > 0:
if print_code:
print(queue)
addr = queue.pop(0)
try:
index = obfu_code_table[addr][0]
cont_mode = (obfu_code_table[addr][4] >> 12) & 0x7F
#print(hex(cont_mode))
except:
raise Exception(hex(addr))
addr, addr0, addr1 = obfu_ctrlflow[index]
if cont_mode not in [0x0B, 0x10, 0x13, 0x16, 0x33, 0x38, 0x45, 0x74]:
for a in [addr0, addr1]:
#print(a)
if a > 0:
b = nearest_block(a)
#print(b)
if b not in visited_blocks and b != addr:
visited_blocks.append(b)
queue.append(b)
# visited_blocks = sorted(visited_blocks)
visited_indexes = list(map(lambda b: obfu_code_table[b][0], visited_blocks))
block_sizes = list(map(lambda b: obfu_code_table[b][4] & 0xFFF, visited_blocks))
code_out = b""
for i in visited_indexes:
addr, addr0, addr1 = obfu_ctrlflow[i]
code_out += decrypt_code(addr, len(code_out) + start_offset, print_code)
unk3 = obfu_code_table[addr][4]
cont_mode = (unk3 >> 12) & 0x7F
if cont_mode in [0x0B, 0x10, 0x13, 0x16, 0x33, 0x38, 0x45, 0x74]:
# print("INDIRECT JUMP")
param1 = addr0
param2 = addr1
base_reg = INDIR_REGS[(param1 >> 8) & 7]
index_reg = INDIR_REGS[(param1 >> 15) & 7]
scale = mem_read_int(sym_data_inv["?Scale@WARBIRD@@3PAKA"] + 4 * ((param1 >> 12) & 3))
disp = param2
if param1 & 0x80000 != 0:
disp += image_start
jmp_operand = ""
if cont_mode in [0x0B, 0x10, 0x16, 0x74]:
jmp_operand += hex(disp)
if param1 & 0x80 != 0:
jmp_operand += f"+{base_reg}"
if param1 & 0x4000 != 0:
jmp_operand += f"+{scale}*{index_reg}"
elif cont_mode in [0x13, 0x33, 0x38, 0x45]:
jmp_operand = base_reg
jmp_code_bin = assemble(f"jmp [{jmp_operand}]")
jmp_code_bin += b"\x90" * (16 - len(jmp_code_bin))
code_out += jmp_code_bin
elif cont_mode in [0x19, 0x2F, 0x58, 0x63]:
ret_size = (unk3 >> 21) & 0xF
# print(f"RETURN {ret_size}")
# print(hex(addr))
ret_code_bin = assemble(f"ret {ret_size * 4}")
ret_code_bin += b"\x90" * (16 - len(ret_code_bin))
code_out += ret_code_bin
else:
# print("DIRECT JUMP")
jmp_code = ""
# 0x01 CF
# 0x04 PF
# 0x10 AF
# 0x40 ZF
# 0x80 SF
# 0x100 TF
# 0x200 IF
# 0x400 DF
# 0x800 OF
if cont_mode in [0x00, 0x34, 0x5A, 0x6C]:
# SF == 0 -> Addr1 else Addr0
# js addr0
# jmp addr1
jmp_code = "js {addr0}; jmp {addr1}"
elif cont_mode in [0x01, 0x20, 0x2D, 0x42]:
# ZF != 0 || SF != OF -> Addr0 else Addr1
# jz addr0
# jl addr0
# jmp addr1
jmp_code = "jz {addr0}; jl {addr0}; jmp {addr1}"
elif cont_mode in [0x02, 0x21, 0x2E, 0x35]:
# jmp addr1
jmp_code = "jmp {addr1}"
elif cont_mode in [0x03, 0x0F, 0x4A, 0x67]:
# SF != 0 -> Addr0
# SF == 0 && OF == 0 -> Addr0
# SF == 0 && OF != 0 -> Addr1
# js addr0
# jno addr0
# jmp addr1
jmp_code = "js {addr0}; jno {addr0}; jmp {addr1}"
elif cont_mode in [0x05, 0x11, 0x5D, 0x78]:
# PF == 0 -> Addr1 else Addr0
# jp addr0
# jmp addr1
jmp_code = "jp {addr0}; jmp {addr1}"
elif cont_mode in [0x06, 0x4D, 0x54, 0x6D]:
# ZF != 0 || SF == OF -> Addr0 else Addr1
# jz addr0
# jnl addr0
# jmp addr1
jmp_code = "jz {addr0}; jnl {addr0}; jmp {addr1}"
elif cont_mode in [0x07, 0x0E, 0x3C, 0x53]:
# OF == 0 -> Addr1 else Addr0
# jo addr0
# jmp addr1
jmp_code = "jo {addr0}; jmp {addr1}"
elif cont_mode in [0x08, 0x0D, 0x1F, 0x5B]:
# ZF != 0 -> Addr1
# ZF == 0 && SF == OF -> Addr0
# ZF == 0 && SF != OF -> Addr1
# jz addr1
# jl addr1
# jmp addr0
jmp_code = "jz {addr1}; jl {addr1}; jmp {addr0}"
elif cont_mode in [0x09, 0x22, 0x25, 0x31]:
# PF != 0 -> Addr1 else Addr0
# jnp addr0
# jmp addr1
jmp_code = "jnp {addr0}; jmp {addr1}"
elif cont_mode in [0x0A, 0x17, 0x24, 0x32]:
# ZF != 0 -> Addr0
# ZF == 0 && OF == 0 -> Addr0
# ZF == 0 && OF != 0 -> Addr1
# jz addr0
# jno addr0
# jmp addr1
jmp_code = "jz {addr0}; jno {addr0}; jmp {addr1}"
elif cont_mode in [0x0C, 0x4B, 0x56, 0x65]:
# PF && CF -> Addr1 else Addr0
# jnp addr0
# jnc addr0
# jmp addr1
jmp_code = "jnp {addr0}; jnc {addr0}; jmp {addr1}"
elif cont_mode in [0x12, 0x18, 0x1D, 0x51]:
# SF != OF -> Addr1 else Addr0
# jnl addr0
# jmp addr1
jmp_code = "jnl {addr0}; jmp {addr1}"
elif cont_mode in [0x14, 0x3B, 0x4F, 0x5F]:
# OF != 0 -> Addr1 else Addr0
# jno addr0
# jmp addr1
jmp_code = "jno {addr0}; jmp {addr1}"
elif cont_mode in [0x15, 0x1E, 0x41, 0x55]:
# PF == 0 -> Addr1
# PF != 0 && ZF == OF -> Addr0
# PF != 0 && ZF != OF -> Addr1
raise Exception("Invalid continuation mode")
elif cont_mode in [0x1A, 0x3E, 0x60, 0x72]:
# PF != 0 -> Addr1 else Addr0
# jnp addr0
# jmp addr1
jmp_code = "jnp {addr0}; jmp {addr1}"
elif cont_mode in [0x1B, 0x44, 0x48, 0x7E]:
# ZF == 0 -> Addr1 else Addr0
# jz addr0
# jmp addr1
jmp_code = "jz {addr0}; jmp {addr1}"
elif cont_mode in [0x1C, 0x26, 0x2B, 0x75]:
# ZF == 0 || PF != 0 -> Addr0 else Addr1
# jnz addr0
# jp addr0
# jmp addr1
jmp_code = "jnz {addr0}; jp {addr0}; jmp {addr1}"
elif cont_mode in [0x27, 0x43, 0x64, 0x6B]:
# SF != 0 -> Addr1 else Addr0
# jns addr0
# jmp addr1
jmp_code = "jns {addr0}; jmp {addr1}"
elif cont_mode in [0x28, 0x40, 0x68, 0x7B]:
# CF != 0 -> Addr1
# CF == 0 && ZF == 0 -> Addr0
# CF == 0 && ZF != 0 -> Addr1
# ja addr0
# jmp addr1
jmp_code = "ja {addr0}; jmp {addr1}"
elif cont_mode in [0x29, 0x3A, 0x71, 0x76]:
# ZF != 0 || CF != PF -> Addr0 else Addr1
raise Exception("Invalid continuation mode")
elif cont_mode in [0x2C, 0x30, 0x3F, 0x7C]:
# DF == 0 -> Addr1 else Addr0
raise Exception("Invalid continuation mode")
elif cont_mode in [0x36, 0x59, 0x61, 0x7D]:
# CF == 0 -> Addr1 else Addr0
# jc addr0
# jmp addr1
jmp_code = "jc {addr0}; jmp {addr1}"
elif cont_mode in [0x37, 0x52, 0x5E, 0x79]:
# CF != 0 || ZF != 0 -> Addr0 else Addr1
# jna addr0
# jmp addr1
jmp_code = "jna {addr0}; jmp {addr1}"
elif cont_mode in [0x39, 0x4E, 0x6F, 0x7A]:
# SF == OF -> Addr0 else Addr1
# jge addr0
# jmp addr1
jmp_code = "jge {addr0}; jmp {addr1}"
elif cont_mode in [0x46, 0x6A, 0x70, 0x77]:
# CF != 0 -> Addr1
# CF == 0 && OF == 0 -> Addr0
# CF == 0 && OF != 0 -> Addr1
# jc addr1
# jo addr1
# jmp addr0
jmp_code = "jc {addr1}; jo {addr1}; jmp {addr0}"
elif cont_mode in [0x47, 0x49, 0x62, 0x73]:
# ZF != 0 -> Addr1 else Addr0
# jnz addr0
# jmp addr1
jmp_code = "jnz {addr0}; jmp {addr1}"
elif cont_mode in [0x4C, 0x66, 0x69, 0x7F]:
# CF != 0 -> Addr1
# CF == 0 && PF != 0 -> Addr0
# CF == 0 && PF == 0 -> Addr1
# jc addr1
# jnp addr1
# jmp addr0
jmp_code = "jc {addr1}; jnp {addr1}; jmp {addr0}"
elif cont_mode in [0x50, 0x57, 0x5C, 0x6E]:
# CF != 0 -> Addr1 else Addr0
# jnc addr0
# jmp addr1
jmp_code = "jnc {addr0}; jmp {addr1}"
else:
pass
# jmp addr0
jmp_code = "jmp {addr0}"
# print(hex(addr), hex(addr0), hex(addr1))
block_offset0 = addr0 - nearest_block(addr0)
block_offset1 = addr1 - nearest_block(addr1)
addr0_index = visited_blocks.index(addr0 - block_offset0)
addr1_index = visited_blocks.index(addr1 - block_offset1)
# print(addr0_index, addr1_index)
addr0_jmptarg = block_offset0 + sum(block_sizes[:addr0_index]) + 16 * addr0_index - len(code_out)
addr1_jmptarg = block_offset1 + sum(block_sizes[:addr1_index]) + 16 * addr1_index - len(code_out)
jmp_code = jmp_code.format(addr0=addr0_jmptarg, addr1=addr1_jmptarg)
jmp_code_bin = assemble(jmp_code)
# print(hex(addr), hex(addr0), hex(addr1), hex(cont_mode), hex(unk3))
jmp_code_bin += b"\x90" * (16 - len(jmp_code_bin))
code_out += jmp_code_bin
next_block = min(addr0 - block_offset0, addr1 - block_offset1)
if next_block == addr:
next_block = max(addr0 - block_offset0, addr1 - block_offset1)
i = obfu_code_table[next_block][0]
if print_code:
for instr in md.disasm(code_out, start_offset):
print(instr)
"""
with open("bins/" + hex(ecstart) + ".bin", "wb") as f:
f.write(code_out)
"""
return code_out
def get_all_stubs():
pe_data = ql.mem.read(image_start, image_size)
f = open("func_table.txt", "w")
obfu_jmps = []
bad_stubs = []
# "nooo write another function dont just copy paste a loop twice" :nerd:
for match in re.finditer(STUB_RET4_REGEX, pe_data):
match_addr = image_start + match.start()
# print(hex(match_addr))
stub_code = ql.mem.read(match_addr - 0x50, 0x50)
try:
stub_start_offset = list(re.finditer(PUSH_REGEX, stub_code, re.DOTALL))[0].start()
except:
# print("A")
continue
stub_start_addr = match_addr - 0x50 + stub_start_offset
instrs = list(md.disasm(ql.mem.read(stub_start_addr, 0x47), stub_start_addr))
ret = 0
for i, instr in enumerate(instrs):
# print(instr)
if instr.mnemonic == "ret" and instr.op_str == "4":
ret = i
break
if ret < 8:
# print("B")
continue
# min 7 backwards -> first push instr, then stop
# much better than whatever this is supposed to be
stub_start_index = ret - 8
if instrs[ret-2].mnemonic == "mov":
stub_start_index -= 1
if instrs[stub_start_index].mnemonic == "mov" or instrs[stub_start_index].mnemonic == "push":
stub_start_index += 1
elif instrs[stub_start_index].mnemonic != "lea":
# print("C")
continue
stub_start = instrs[stub_start_index].address
try:
used_reg = list(md.disasm(instrs[stub_start_index].bytes, 0))[0].operands[0].value.reg
except:
raise Exception("D")
if used_reg not in REG_NAMES:
# print("E")
continue
used_reg_name = REG_NAMES[used_reg].lower()
# print("ADDRESS ASSIGNED @ " + hex(stub_start))
len_stub = (instrs[ret].address + 3) - stub_start
# ql.mem.write(stub_start, NOP * len_stub)
# ql.mem.write(chksum_data, NOP * 16)
push_instrs = list(map(lambda c: bytearray(ks.asm(c)[0]), [f"push {used_reg_name}", f"lea esp, [esp-4]", f"mov [esp], {used_reg_name}"]))
jmp_insert_addr = 0
for inst in instrs[max(0,stub_start_index-4):stub_start_index][::-1]:
# print(inst)
if inst.bytes in push_instrs:
# ql.mem.write(inst.address, NOP * len(inst.bytes))
jmp_insert_addr = inst.address
else:
break
if jmp_insert_addr == 0:
# print("F")
continue
# print("NOPPED STARTING @ " + hex(jmp_insert_addr))
# print("PASS1")
try:
ql.run(begin=jmp_insert_addr, end=instrs[ret].address)
handler_addr = ql.arch.stack_pop()
ql.arch.stack_pop()
next_addr = ql.arch.stack_pop()
except:
handler_addr = -1
next_addr = -1
if handler_addr == 0 or next_addr == 0 or handler_addr == -1 or next_addr == -1:
bad_stubs.append(jmp_insert_addr)
continue
# print("PASS2")
# print("HANDLER @ " + hex(handler_addr))
# print("JUMP TARGET @ " + hex(next_addr))
# print(ql.arch.regs.esp)
if handler_addr in sym_data:
handler_name = sym_data[handler_addr]
else:
handler_name = hex(handler_addr)
if next_addr in sym_data:
next_name = f"{hex(next_addr)} {sym_data[next_addr]}"
else:
next_name = hex(next_addr)
jmp_end_addr = instrs[ret].address + instrs[ret].size
obfu_jmps.append((jmp_insert_addr, jmp_end_addr, handler_addr, next_addr))
f.write(f"J R4 S {hex(jmp_insert_addr)} H {handler_name} N {next_name}\n")
# input()
# print()
# input()
for match in re.finditer(STUB_RET0_REGEX, pe_data):
match_addr = image_start + match.start()
# print(hex(match_addr))
stub_code = ql.mem.read(match_addr - 0x30, 0x30)
try:
stub_start_offset = list(re.finditer(PUSH_REGEX, stub_code, re.DOTALL))[0].start()
except:
# print("A")
continue
stub_start_addr = match_addr - 0x30 + stub_start_offset
instrs = list(md.disasm(ql.mem.read(stub_start_addr, 0x47), stub_start_addr))
ret = 0
for i, instr in enumerate(instrs):
# print(instr)
if instr.mnemonic == "ret" and instr.op_str == "":
ret = i
break
if ret < 7:
# print("A2", ret)
continue
# min 7 backwards -> first push instr, then stop
# much better than whatever this is supposed to be
stub_start_index = ret - 7
if instrs[ret-2].mnemonic == "mov":
stub_start_index -= 1
if instrs[stub_start_index].mnemonic == "mov" or instrs[stub_start_index].mnemonic == "push":
stub_start_index += 1
elif instrs[stub_start_index].mnemonic != "lea":
# print("B")
continue
stub_start = instrs[stub_start_index].address
try:
used_reg = list(md.disasm(instrs[stub_start_index].bytes, 0))[0].operands[0].value.reg
except:
raise Exception("C")
if used_reg not in REG_NAMES:
# print("D")
continue
used_reg_name = REG_NAMES[used_reg].lower()
# print("ADDRESS ASSIGNED @ " + hex(stub_start))
len_stub = (instrs[ret].address + 3) - stub_start
# ql.mem.write(stub_start, NOP * len_stub)
# ql.mem.write(chksum_data, NOP * 16)
push_instrs = list(map(lambda c: bytearray(ks.asm(c)[0]), [f"push {used_reg_name}", f"lea esp, [esp-4]", f"mov [esp], {used_reg_name}"]))
jmp_insert_addr = 0
for inst in instrs[max(0,stub_start_index-4):stub_start_index][::-1]:
# print(inst)
if inst.bytes in push_instrs:
# ql.mem.write(inst.address, NOP * len(inst.bytes))
jmp_insert_addr = inst.address
else:
break
if jmp_insert_addr == 0:
# print("E")
continue
# print("NOPPED STARTING @ " + hex(jmp_insert_addr))
try:
ql.run(begin=jmp_insert_addr, end=instrs[ret].address)
handler_addr = ql.arch.stack_pop()
next_addr = ql.arch.stack_pop()
except:
handler_addr = -1
next_addr = -1
if handler_addr == 0 or next_addr == 0 or handler_addr == -1 or next_addr == -1:
bad_stubs.append(jmp_insert_addr)
continue
# print("HANDLER @ " + hex(handler_addr))
# print("JUMP TARGET @ " + hex(next_addr))
# print(ql.arch.regs.esp)
if handler_addr in sym_data:
handler_name = sym_data[handler_addr]
else:
handler_name = hex(handler_addr)
if next_addr in sym_data:
next_name = f"{hex(next_addr)} {sym_data[next_addr]}"
else:
next_name = hex(next_addr)
jmp_end_addr = instrs[ret].address + instrs[ret].size
obfu_jmps.append((jmp_insert_addr, jmp_end_addr, handler_addr, next_addr))
f.write(f"J R0 S {hex(jmp_insert_addr)} H {handler_name} N {next_name}\n")
# input()
# print()
# input()
f.close()
return obfu_jmps, bad_stubs
def add_pe_section(pe, name, characteristics=0x60000020, size=0x100000):
f_align = pe.OPTIONAL_HEADER.FileAlignment
sect_align = pe.OPTIONAL_HEADER.SectionAlignment
if len(name) > 8:
raise Exception("Section name too long!")
data = b"\x00" * size
if size % f_align == 0:
data += b"\x00" * (f_align - (len(data) % f_align))
sect_table_offset = pe.DOS_HEADER.e_lfanew + 4 + pe.FILE_HEADER.sizeof() + pe.FILE_HEADER.SizeOfOptionalHeader
sect_table_end_offset = sect_table_offset + pe.FILE_HEADER.NumberOfSections * 0x28
if pe.OPTIONAL_HEADER.SizeOfHeaders - sect_table_end_offset < 0x28:
raise Exception("Not enough space for header")
raw_addr = pe.sections[-1].PointerToRawData + pe.sections[-1].SizeOfRawData
virt_addr = pe.sections[-1].VirtualAddress + pe.sections[-1].Misc_VirtualSize
if virt_addr % sect_align != 0:
virt_addr += sect_align - (virt_addr % sect_align)
pe.__data__ = pe.__data__[:raw_addr] + data + pe.__data__[raw_addr:]
sect_header = struct.pack("<8sIIIIIIII", name.encode("utf-8"), len(data), virt_addr, len(data), raw_addr, 0, 0, 0, characteristics)
pe.set_bytes_at_offset(sect_table_end_offset, sect_header)
pe.FILE_HEADER.NumberOfSections += 1
pe.parse_sections(sect_table_offset)
pe.OPTIONAL_HEADER.SizeOfImage = pe.sections[-1].VirtualAddress + pe.sections[-1].Misc_VirtualSize
pe.OPTIONAL_HEADER.SizeOfCode = 0
pe.OPTIONAL_HEADER.SizeOfInitializedData = 0
pe.OPTIONAL_HEADER.SizeOfUninitializedData = 0
for sect in pe.sections:
if sect.Characteristics & 0x20 != 0:
pe.OPTIONAL_HEADER.SizeOfCode += sect.SizeOfRawData
if sect.Characteristics & 0x40 != 0:
pe.OPTIONAL_HEADER.SizeOfInitializedData += sect.SizeOfRawData
if sect.Characteristics & 0x80 != 0:
pe.OPTIONAL_HEADER.SizeOfUninitializedData += sect.SizeOfRawData
if __name__ == "__main__":
print("peacestone copyleft UMSKT project 2023")
print()
# os.makedirs("bins", exist_ok=True)
#"""
print("Finding all obfuscated jump stubs...")
obfu_jmps, bad_stubs = get_all_stubs()
print(f"Found {len(obfu_jmps)} stubs.")
if len(bad_stubs) > 0:
print(f"WARNING: Found {len(bad_stubs)} stubs that could not be automatically deobfuscated.")
encr_funcs = []
for addr in obfu_code_table:
if addr in sym_data:
encr_funcs.append(addr)
print(f"Found {len(encr_funcs)} named encrypted functions.")
print()
print("Deobfuscating...")
pe = pefile.PE(BIN_NAME)
add_pe_section(pe, ".pstone")
deobf_cur = pe.sections[-1].VirtualAddress
deobf_table = {}
for func in encr_funcs:
df_code = deobfu_func(func, image_start + deobf_cur)
pe.set_bytes_at_rva(deobf_cur, df_code)
ecstart_replace_code = assemble(f"jmp {image_start + deobf_cur - func}")
pe.set_bytes_at_rva(func - image_start, ecstart_replace_code)
deobf_table[func] = deobf_cur
deobf_cur += len(df_code)
obfu_handler = sym_data_inv["?Stub_EnterObfuscatedMode@WARBIRD@@YAXXZ"]
verify_handler = sym_data_inv["?Stub_VerifyVerifierCheckSum@WARBIRD@@YAXXZ"]
for start, end, handler, arg in obfu_jmps:
# print(hex(start), hex(end), hex(handler), hex(arg))
if handler == obfu_handler:
# print("^OBFU")
if arg in deobf_table:
deobf_offset = deobf_table[arg]
else:
deobf_offset = deobf_cur
df_code = deobfu_func(arg, image_start + deobf_cur)
pe.set_bytes_at_rva(deobf_cur, df_code)
ecstart_replace_code = assemble(f"jmp {image_start + deobf_offset - arg}")
pe.set_bytes_at_rva(arg - image_start, ecstart_replace_code)
deobf_table[arg] = deobf_cur
deobf_cur += len(df_code)
stub_replace_code = assemble(f"jmp {image_start + deobf_offset - start}")
stub_replace_code += b"\x90" * (end - start - len(stub_replace_code))
elif handler == verify_handler:
# print("^VERIFY")
stub_replace_code = assemble(f"jmp {arg + 0x10 - start}")
stub_replace_code += b"\x90" * (end - start - len(stub_replace_code)) + b"\x90" * 16
else:
# print("^NEITHER")
stub_replace_code = assemble(f"call {handler - start}")
stub_replace_code += b"\x90" * (end - start - len(stub_replace_code))
pe.set_bytes_at_rva(start - image_start, stub_replace_code)
#"""
md.detail = False
print("Removing thunk indirection...")
func_addrs = sym_addrs + sorted(map(lambda a: a + image_start, deobf_table.values()))
for i, func in enumerate(func_addrs):
# All MSVC-compiled functions start with mov edi, edi (8B FF)
if pe.get_data(func - image_start, 2) == b"\x8b\xff":
# print(hex(func))
if i < len(func_addrs) - 1:
read_len = func_addrs[i+1] - func
else:
read_len = 0x10000
for instr in md.disasm(pe.get_data(func - image_start, read_len), func):
# print(instr)
if instr.mnemonic == "call":
# print("CALL")
try:
# print("VALID")
jmp_target = int(instr.op_str, 16)
target_instr = next(md.disasm(ql.mem.read(jmp_target, 16), jmp_target))
# print(target_instr)
if target_instr.mnemonic == "jmp":
# print("PATCH")
true_target = int(target_instr.op_str, 16)