mirror of https://github.com/UMSKT/peacestone.git
implement control flow
This commit is contained in:
WitherOrNot
parent
16a9a1054c
commit
bb662279d8
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@ -15,7 +15,7 @@ A8 ebp
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24 OldRetAddr (_initterm)
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;; not fastcall calling convention!
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ecx <- [esp+1C] // Right below RetAddr
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ecx/"this" <- [esp+1C] // Right below RetAddr
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edx <- STUB_FRAME (??)
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val_3 -> {???}{7 bits select offset for something}{12 bits size decrypted data}
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448
obfu_block.py
448
obfu_block.py
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@ -53,7 +53,8 @@ def array_write_int(array, offset, val):
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return arr_copy
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stub_frame = 0x120f989
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def assemble(instrs):
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return bytes(ks.asm(instrs)[0])
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num_obd = mem_read_int(sym_data_inv["?g_nNumObfuscatedBlockData@WARBIRD@@3KA"])
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obd_addr = sym_data_inv["?g_ObfuscatedBlockData@WARBIRD@@3PAU_OBFUSCATED_BLOCK_DATA@1@A"]
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@ -74,26 +75,27 @@ private_relocs = []
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for i in range(num_relocs):
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private_relocs.append(mem_read_int(reloc_addr + 4*i))
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stub_frame_offset = stub_frame - image_start
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obfu_code_table = {}
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obfu_ctrlflow = []
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first = 0
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first_prev = first
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last = num_obd - 1
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last_prev = last
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sum_diff = 0
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for target in range(num_obd):
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first = 0
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first_prev = 0
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last = num_obd - 1
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last_prev = num_obd - 1
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sum_diff = 0
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while True:
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while True:
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index = (first + last) // 2
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xor_value = obd[index][0] ^ sum_diff
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if stub_frame_offset >= xor_value:
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if stub_frame_offset >= xor_value + (obd[index][3] & 0xFFF):
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if index <= target:
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if index != target:
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first = index + 1
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last = last_prev
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first_prev = first
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sum_diff = (obd[index][0] - obd[index][3]) % (1 << 32)
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else:
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print(f"XOR {hex(xor_value)} SUMDIFF {hex(sum_diff)} INDEX {hex(index)}")
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break
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else:
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last = index - 1
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@ -101,24 +103,45 @@ while True:
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sum_diff = (obd[index][0] + obd[index][3]) % (1 << 32)
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if first > last:
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raise Exception("Offset not found in block table!")
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raise Exception("???")
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print(f"XOR {hex(xor_value)} SUMDIFF {hex(sum_diff)} INDEX {hex(index)}")
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addr = image_start + xor_value
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val1 = (obd[index][1] + obd[index][0]) % (1 << 32)
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val2 = (obd[index][2] - obd[index][0]) % (1 << 32)
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val3 = (obd[index][4] + obd[index][3]) % (1 << 32)
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unk3 = obd[index][3]
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val1 = (obd[index][1] + obd[index][0]) % (1 << 32)
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val2 = (obd[index][2] - obd[index][0]) % (1 << 32)
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val3 = (obd[index][4] + obd[index][3]) % (1 << 32)
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unk3 = obd[index][3]
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cont_mode = (unk3 >> 12) & 0x7F
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data_size = unk3 & 0xfff
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print(f"VAL1 {hex(val1)} VAL2 {hex(val2)} VAL3 {hex(val3)} UNK3 {hex(unk3)}")
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if cont_mode in [0x0B, 0x10, 0x13, 0x16, 0x33, 0x38, 0x45, 0x74]:
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# INDIRECT JUMP
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param1 = (unk3 >> 18) & 0x3F00 | (unk3 >> 12) & 0x80 | cont_mode & 0xFFF0007F | ((unk3 & 0x100000 | ((unk3 & 0x1E00000 | (unk3 >> 5) & 0x100000) >> 5)) >> 1)
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param2 = val3
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obfu_ctrlflow.append((-1, -1))
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elif cont_mode in [0x19, 0x2F, 0x58, 0x63]:
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# RETURN
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obfu_ctrlflow.append((addr, 0, 0))
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else:
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# DIRECT JUMP
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addr0 = image_start + xor_value + data_size
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addr1 = image_start + val3
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data_size = unk3 & 0xfff
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xor_plus_binstart = image_start + xor_value
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enc_bytes = ql.mem.read(xor_plus_binstart, data_size + 1)
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dec_bytes = [0] * data_size
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chksum = 0xa5
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obfu_ctrlflow.append((addr, addr0, addr1))
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if val2 & 0x1000000 == 0:
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obfu_code_table[addr] = (index, val1, val2, val3, unk3)
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def decrypt_code(ecstart):
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print("DECRYPTING CODE @ " + hex(ecstart))
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ecstart_offset = ecstart - image_start
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index, val1, val2, val3, unk3 = obfu_code_table[ecstart]
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data_size = unk3 & 0xfff
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enc_bytes = ql.mem.read(ecstart, data_size + 1)
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dec_bytes = [0] * data_size
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chksum = 0xa5
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if val2 & 0x1000000 == 0:
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print("DERIVING KEY FROM MAC")
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mac_func = mem_read_int(sym_data_inv["?g_apMacFuncs@WARBIRD@@3PAP6AXAA_JPBE1ABU_CBCKey2@1@@ZA"] + (val2 >> 25) * 4)
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@ -128,7 +151,7 @@ if val2 & 0x1000000 == 0:
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break
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ql.mem.write(scratch_base, b"\x00\x01\x02\x03\x04\x05")
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ql.mem.write(scratch_base + 0x10, ql.pack(xor_value))
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ql.mem.write(scratch_base + 0x10, ql.pack(ecstart_offset))
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ql.mem.write(scratch_base + 0x14, ql.pack(0))
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ql.arch.stack_push(scratch_base)
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ql.arch.stack_push(val1 + image_start + (val2 & 0xffff))
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@ -142,12 +165,12 @@ if val2 & 0x1000000 == 0:
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key1 = ql.mem.read(0x10, 4)
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key2 = ql.mem.read(0x14, 2)
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else:
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else:
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print("USING BLOCK VALUES AS KEY")
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key1 = val1.to_bytes(4, "little")
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key2 = (val2 & 0xFFFF).to_bytes(2, "little")
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for i in range(data_size - 1, -1, -1):
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for i in range(data_size - 1, -1, -1):
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enc_byte = enc_bytes[i]
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if i > 0:
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@ -179,20 +202,20 @@ for i in range(data_size - 1, -1, -1):
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chksum ^= dec_byte
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dec_bytes[i] = dec_byte
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if chksum != (val2 >> 16) & 0xFF:
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if chksum != (val2 >> 16) & 0xFF:
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raise Exception("CHECKSUM FAILED!")
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print(dec_bytes)
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print(dec_bytes)
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first = 0
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last = num_relocs - 1
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first = 0
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last = num_relocs - 1
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while last >= first:
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while last >= first:
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index = (first + last) // 2
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addr = private_relocs[index] & 0xFFFFFFF
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if xor_value >= addr:
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if xor_value == addr:
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if ecstart_offset >= addr:
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if ecstart_offset == addr:
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first = (first + last) // 2
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break
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@ -200,32 +223,369 @@ while last >= first:
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else:
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last = index - 1
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index = first
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index = first
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while index < num_relocs:
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while index < num_relocs:
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addr = private_relocs[index] & 0xFFFFFFF
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if addr >= (xor_value + data_size):
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if addr >= (ecstart_offset + data_size):
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break
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offset = 0
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ofmode = (private_relocs[index] >> 28) & 3
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if ofmode == 1:
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offset = -xor_plus_binstart % (1 << 32)
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offset = -ecstart % (1 << 32)
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elif ofmode == 2:
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offset = xor_plus_binstart
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offset = ecstart
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if ((private_relocs[index] >> 30) & 3) == 2 and offset != 0:
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print(f"RELOC @ OFFSET {hex(addr - xor_value)} +{hex(offset)}")
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val = array_read_int(dec_bytes, addr - xor_value)
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print(f"RELOC @ OFFSET {hex(addr - ecstart_offset)} +{hex(offset)}")
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val = array_read_int(dec_bytes, addr - ecstart_offset)
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val = (val + offset) % (1 << 32)
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dec_bytes = array_write_int(dec_bytes, addr - xor_value, val)
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dec_bytes = array_write_int(dec_bytes, addr - ecstart_offset, val)
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print(dec_bytes)
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index += 1
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dec_bytes = bytes(dec_bytes)
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dec_bytes = bytes(dec_bytes)
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for instr in md.disasm(dec_bytes, 0):
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for instr in md.disasm(dec_bytes, 0):
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print(instr)
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return dec_bytes
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def nearest_block(caddr):
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return list(filter(lambda a: a <= caddr, obfu_code_table))[-1]
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def deobfu_func(ecstart):
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print("DEOBFUSCATING CODE @ " + hex(ecstart))
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ecstart_offset = ecstart - image_start
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code_chunks = []
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index, val1, val2, val3, unk3 = obfu_code_table[ecstart]
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min_index = index
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addr = 0
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max_addr = ecstart
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while addr < max_addr:
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addr, addr0, addr1 = obfu_ctrlflow[index]
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max_addr = max(max_addr, addr, addr0, addr1)
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if max_addr not in obfu_code_table:
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max_addr = nearest_block(max_addr)
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print(hex(addr), hex(max_addr))
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code_chunks.append(decrypt_code(addr))
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index += 1
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max_index = index
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ctrlflow = obfu_ctrlflow[min_index:max_index]
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code_out = b""
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for i in range(max_index - min_index):
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code_out += code_chunks[i]
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addr, addr0, addr1 = ctrlflow[i]
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unk3 = obfu_code_table[addr][4]
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cont_mode = (unk3 >> 12) & 0x7F
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if cont_mode in [0x0B, 0x10, 0x13, 0x16, 0x33, 0x38, 0x45, 0x74]:
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print("INDIRECT JUMP?")
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param1 = (unk3 >> 18) & 0x3F00 | (unk3 >> 12) & 0x80 | cont_mode & 0xFFF0007F | ((unk3 & 0x100000 | ((unk3 & 0x1E00000 | (unk3 >> 5) & 0x100000) >> 5)) >> 1)
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param2 = val3
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# return b""
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elif cont_mode in [0x19, 0x2F, 0x58, 0x63]:
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ret_size = (unk3 >> 21) & 0xF
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print(f"RETURN {ret_size}")
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print(hex(addr))
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ret_code_bin = assemble(f"ret {ret_size * 4}")
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ret_code_bin += b"\x90" * (16 - len(ret_code_bin))
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code_out += ret_code_bin
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else:
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print("DIRECT JUMP")
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jmp_code = ""
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# 0x01 CF
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# 0x04 PF
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# 0x10 AF
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# 0x40 ZF
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# 0x80 SF
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# 0x100 TF
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# 0x200 IF
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# 0x400 DF
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# 0x800 OF
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if cont_mode in [0x00, 0x34, 0x5A, 0x6C]:
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pass
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# SF == 0 -> Addr1 else Addr0
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# js addr0
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# jmp addr1
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jmp_code = "js {addr0}; jmp {addr1}"
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elif cont_mode in [0x01, 0x20, 0x2D, 0x42]:
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pass
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# ZF != 0 || SF != OF -> Addr0 else Addr1
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# jz addr0
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# jl addr0
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# jmp addr1
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jmp_code = "jz {addr0}; jl {addr0}; jmp {addr1}"
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elif cont_mode in [0x02, 0x21, 0x2E, 0x35]:
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pass
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# jmp addr1
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jmp_code = "jmp {addr1}"
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elif cont_mode in [0x03, 0x0F, 0x4A, 0x67]:
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pass
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# SF != 0 -> Addr0
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# SF == 0 && OF == 0 -> Addr0
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# SF == 0 && OF != 0 -> Addr1
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# js addr0
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# jno addr0
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# jmp addr1
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jmp_code = "js {addr0}; jno {addr0}; jmp {addr1}"
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elif cont_mode in [0x05, 0x11, 0x5D, 0x78]:
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pass
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# PF == 0 -> Addr1 else Addr0
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# jp addr0
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# jmp addr1
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jmp_code = "jp {addr0}; jmp {addr1}"
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elif cont_mode in [0x06, 0x4D, 0x54, 0x6D]:
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pass
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# ZF != 0 || SF == OF -> Addr0 else Addr1
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# jz addr0
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# jnl addr0
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# jmp addr1
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jmp_code = "jz {addr0}; jnl {addr0}; jmp {addr1}"
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elif cont_mode in [0x07, 0x0E, 0x3C, 0x53]:
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pass
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# OF == 0 -> Addr1 else Addr0
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# jo addr0
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# jmp addr1
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jmp_code = "jo {addr0}; jmp {addr1}"
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elif cont_mode in [0x08, 0x0D, 0x1F, 0x5B]:
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pass
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# ZF != 0 -> Addr1
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# ZF == 0 && SF == OF -> Addr0
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# ZF == 0 && SF != OF -> Addr1
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# jz addr1
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# jl addr1
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# jmp addr0
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jmp_code = "jz {addr1}; jl {addr1}; jmp {addr0}"
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elif cont_mode in [0x09, 0x22, 0x25, 0x31]:
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pass
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# PF != 0 -> Addr1 else Addr0
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# jnp addr0
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# jmp addr1
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jmp_code = "jnp {addr0}; jmp {addr1}"
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elif cont_mode in [0x0A, 0x17, 0x24, 0x32]:
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pass
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# ZF != 0 -> Addr0
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# ZF == 0 && OF == 0 -> Addr0
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# ZF == 0 && OF != 0 -> Addr1
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# jz addr0
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# jno addr0
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# jmp addr1
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jmp_code = "jz {addr0}; jno {addr0}; jmp {addr1}"
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elif cont_mode in [0x0C, 0x4B, 0x56, 0x65]:
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pass
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# PF && CF -> Addr1 else Addr0
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# jnp addr0
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# jnc addr0
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# jmp addr1
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jmp_code = "jnp {addr0}; jnc {addr0}; jmp {addr1}"
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elif cont_mode in [0x12, 0x18, 0x1D, 0x51]:
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pass
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# SF != OF -> Addr1 else Addr0
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# jnl addr0
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# jmp addr1
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jmp_code = "jnl {addr0}; jmp {addr1}"
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elif cont_mode in [0x14, 0x3B, 0x4F, 0x5F]:
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pass
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# OF != 0 -> Addr1 else Addr0
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# jno addr0
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# jmp addr1
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jmp_code = "jno {addr0}; jmp {addr1}"
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elif cont_mode in [0x15, 0x1E, 0x41, 0x55]:
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pass
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# PF == 0 -> Addr1
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# PF != 0 && ZF == OF -> Addr0
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# PF != 0 && ZF != OF -> Addr1
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# jnp addr1
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# push eax
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# push ecx
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# pushfd
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# pop eax
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# mov ecx, eax
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# shr eax, 5
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# xor eax, ecx
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# test al, 40h
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# pop eax
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# pop ecx
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# jz addr0
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# jmp addr1
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elif cont_mode in [0x1A, 0x3E, 0x60, 0x72]:
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pass
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# PF != 0 -> Addr1 else Addr0
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# jnp addr0
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# jmp addr1
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jmp_code = "jnp {addr0}; jmp {addr1}"
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elif cont_mode in [0x1B, 0x44, 0x48, 0x7E]:
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pass
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# ZF == 0 -> Addr1 else Addr0
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# jz addr0
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# jmp addr1
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jmp_code = "jz {addr0}; jmp {addr1}"
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elif cont_mode in [0x1C, 0x26, 0x2B, 0x75]:
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pass
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# ZF == 0 || PF != 0 -> Addr0 else Addr1
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# jnz addr0
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# jp addr0
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# jmp addr1
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jmp_code = "jnz {addr0}; jp {addr0}; jmp {addr1}"
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elif cont_mode in [0x27, 0x43, 0x64, 0x6B]:
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pass
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# SF != 0 -> Addr1 else Addr0
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# jns addr0
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# jmp addr1
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jmp_code = "jns {addr0}; jmp {addr1}"
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elif cont_mode in [0x28, 0x40, 0x68, 0x7B]:
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pass
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# CF != 0 -> Addr1
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# CF == 0 && ZF == 0 -> Addr0
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# CF == 0 && ZF != 0 -> Addr1
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# ja addr0
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# jmp addr1
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jmp_code = "ja {addr0}; jmp {addr1}"
|
||||
elif cont_mode in [0x29, 0x3A, 0x71, 0x76]:
|
||||
pass
|
||||
# ZF != 0 || CF != PF -> Addr0 else Addr1
|
||||
# jz addr0
|
||||
# push eax
|
||||
# push ecx
|
||||
# pushfd
|
||||
# pop eax
|
||||
# mov ecx, eax
|
||||
# shr eax, 2
|
||||
# xor eax, ecx
|
||||
# test al, 01h
|
||||
# pop eax
|
||||
# pop ecx
|
||||
# jnz addr0
|
||||
# jmp addr1
|
||||
elif cont_mode in [0x2C, 0x30, 0x3F, 0x7C]:
|
||||
pass
|
||||
# DF == 0 -> Addr1 else Addr0
|
||||
# push eax
|
||||
# push ecx
|
||||
# pushfd
|
||||
# pop eax
|
||||
# mov ecx, eax
|
||||
# shr eax, 4
|
||||
# xor eax, ecx
|
||||
# test al, 40h
|
||||
# pop eax
|
||||
# pop ecx
|
||||
# jz addr0
|
||||
# jmp addr1
|
||||
elif cont_mode in [0x36, 0x59, 0x61, 0x7D]:
|
||||
pass
|
||||
# CF == 0 -> Addr1 else Addr0
|
||||
# jc addr0
|
||||
# jmp addr1
|
||||
|
||||
jmp_code = "jc {addr0}; jmp {addr1}"
|
||||
elif cont_mode in [0x37, 0x52, 0x5E, 0x79]:
|
||||
pass
|
||||
# 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]:
|
||||
pass
|
||||
# SF == OF -> Addr0 else Addr1
|
||||
# jge addr0
|
||||
# jmp addr1
|
||||
|
||||
jmp_code = "jge {addr0}; jmp {addr1}"
|
||||
elif cont_mode in [0x46, 0x6A, 0x70, 0x77]:
|
||||
pass
|
||||
# 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]:
|
||||
pass
|
||||
# ZF != 0 -> Addr1 else Addr0
|
||||
# jnz addr0
|
||||
# jmp addr1
|
||||
|
||||
jmp_code = "jnz {addr0}; jmp {addr1}"
|
||||
elif cont_mode in [0x4C, 0x66, 0x69, 0x7F]:
|
||||
pass
|
||||
# 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]:
|
||||
pass
|
||||
# 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 = obfu_code_table[addr0 - block_offset0][0] - min_index
|
||||
addr1_index = obfu_code_table[addr1 - block_offset1][0] - min_index
|
||||
|
||||
print(addr0_index, addr1_index)
|
||||
|
||||
jmp_code = jmp_code.format(addr0=block_offset0 + sum(map(len, code_chunks[:addr0_index])) + 16 * addr0_index - len(code_out), addr1=block_offset1 + sum(map(len, code_chunks[:addr1_index])) + 16 * addr1_index - len(code_out))
|
||||
jmp_code_bin = assemble(jmp_code)
|
||||
jmp_code_bin += b"\x90" * (16 - len(jmp_code_bin)) # dont like this but Ghidra kekw
|
||||
code_out += jmp_code_bin
|
||||
|
||||
for instr in md.disasm(code_out, 0):
|
||||
print(instr)
|
||||
|
||||
with open(hex(ecstart) + ".bin", "wb") as f:
|
||||
f.write(code_out)
|
||||
|
||||
return code_out
|
||||
|
||||
# obfu_code(0x12016af)
|
||||
|
|
@ -76,7 +76,7 @@ if __name__ == "__main__":
|
|||
# save_patched_exe()
|
||||
|
||||
pe_data = ql.mem.read(image_start, image_size)
|
||||
f = open("log.txt", "w")
|
||||
f = open("func_table.txt", "w")
|
||||
|
||||
for match in re.finditer(STUB_RET4_REGEX, pe_data):
|
||||
print(hex(match.start()))
|
||||
|
|
@ -114,7 +114,7 @@ if __name__ == "__main__":
|
|||
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("CANT DEAL WITH THIS")
|
||||
# print("CANT DEAL WITH THIS")
|
||||
continue
|
||||
|
||||
stub_start = instrs[stub_start_index].address
|
||||
|
|
@ -125,7 +125,7 @@ if __name__ == "__main__":
|
|||
raise Exception("CANT DEAL WITH THIS")
|
||||
|
||||
if used_reg not in REG_NAMES:
|
||||
print("CANT DEAL WITH THIS")
|
||||
# print("CANT DEAL WITH THIS")
|
||||
continue
|
||||
|
||||
used_reg_name = REG_NAMES[used_reg].lower()
|
||||
|
|
@ -148,7 +148,7 @@ if __name__ == "__main__":
|
|||
break
|
||||
|
||||
if jmp_insert_addr == 0:
|
||||
print("CANT DEAL WITH THIS")
|
||||
# print("CANT DEAL WITH THIS")
|
||||
continue
|
||||
|
||||
print("NOPPED STARTING @ " + hex(jmp_insert_addr))
|
||||
|
|
|
|||
Loading…
Reference in New Issue