mirror of
https://github.com/dobin/SuperMega
synced 2026-06-02 17:27:10 +00:00
refactor: all asm text parsing into asmparser.py
This commit is contained in:
+18
-6
@@ -12,10 +12,11 @@ class IatRequest():
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class DataReuseEntry():
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def __init__(self, string_ref: str, register: str, randbytes: bytes):
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self.string_ref = string_ref
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self.register = register
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self.randbytes = randbytes
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def __init__(self, string_ref: str):
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self.string_ref = string_ref # "$SG72513"
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self.register = "" # "rcx"
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self.randbytes = b"" # placeholder
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self.data = b''
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self.addr = 0
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@@ -30,6 +31,8 @@ class Carrier():
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pass
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# IAT
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def add_iat_request(self, func_name: str, placeholder: bytes):
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self.iat_requests.append(IatRequest(func_name, placeholder))
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@@ -37,8 +40,17 @@ class Carrier():
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return self.iat_requests
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def set_datareuse_fixups(self, fixups: List[DataReuseEntry]):
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self.reusedata_fixups = fixups
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# Data Reuse
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def add_datareuse_fixup(self, fixup: DataReuseEntry):
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self.reusedata_fixups.append(fixup)
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def get_all_reusedata_fixups(self) -> List[DataReuseEntry]:
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return self.reusedata_fixups
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def get_all_reusedata_fixup(self, string_ref) -> DataReuseEntry:
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for entry in self.reusedata_fixups:
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if entry.string_ref == string_ref:
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return entry
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return None
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@@ -0,0 +1,168 @@
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import os
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from typing import List, Dict
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from helper import *
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from model import *
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from model.carrier import Carrier, DataReuseEntry, IatRequest
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logger = logging.getLogger("AsmParser")
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def parse_asm_file(carrier, filename):
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lines_out = []
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with open(filename, 'r', encoding='utf-8') as asmfile:
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lines = asmfile.readlines()
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current_segment = None
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current_datareuse_entry= None
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line_idx = -1
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for line in lines:
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line = line.rstrip()
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line_idx += 1
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tokens = line.split()
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# skip irrelevant
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#if not tokens:
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# lines_out.append(line)
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# continue
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if len(tokens) <= 1:
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lines_out.append(line)
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continue
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# TRACK in which segment we currently are
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if tokens[1] == "SEGMENT":
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current_segment = tokens[0]
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lines_out.append(line)
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continue
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# PATCH SHORT
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if "jmp\tSHORT" in line:
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updated_line = line.replace("SHORT", "")
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lines_out.append(updated_line)
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continue
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# REMOVE EXTRN, we dont need it
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## EXTRN __imp_GetEnvironmentVariableW:PROC
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## to
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## ; EXTRN __imp_GetEnvironmentVariableW:PROC
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if tokens[0] == "EXTRN":
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updated_line = "; " + line + "; Removed"
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lines_out.append(updated_line)
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continue
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# PATCH external shellcode reference
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## mov rdi, QWORD PTR supermega_payload
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## to
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## lea rdi, [shcstart] ; get payload shellcode address
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if "supermega_payload" in line:
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updated_line = line
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updated_line = updated_line.replace(
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"mov ",
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"lea "
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)
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updated_line = updated_line.replace(
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"QWORD PTR supermega_payload",
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"[shcstart] ; get payload shellcode address"
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)
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lines_out.append(updated_line)
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continue
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# ADD label at end of code
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# we cant reliably identify in which function, so we just add it at the end
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## get_time_raw ENDP
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## <---- add here
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## _TEXT ENDS
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## END
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if line_idx > len(lines) - 5 and tokens[1] == "ENDP":
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lines_out.append(line)
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lines_out.append("shcstart: ; start of payload shellcode")
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continue
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# COLLECT AND PATCH all functions that need to be resolved in loader shellcode
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# we replace the function call invocation with a random byte sequence
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## call QWORD PTR __imp_GetEnvironmentVariableW
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## to
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## DB 07cH, 04cH, 028H, 0b0H, 006H, 07eH ; IAT Reuse for GetEnvironmentVariableW
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if "QWORD PTR __imp_" in line:
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# just the function name, without __imp_
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func_name = line[line.find("__imp_")+6:].rstrip()
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randbytes: bytes = os.urandom(6) # exact size or the result
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carrier.add_iat_request(func_name, randbytes)
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new_line = bytes_to_asm_db(randbytes) + " ; IAT Reuse for {}".format(func_name)
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lines_out.append(new_line)
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continue
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# COLLECT data strings
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# these are usually multi-line, and at the beginning of the file
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# $SG72513 DB 'U', 00H, 'S', 00H, 'E', 00H, 'R', 00H, 'P', 00H, 'R', 00H
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# DB 'O', 00H, 'F', 00H, 'I', 00H, 'L', 00H, 'E', 00H, 00H, 00H
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if line.startswith("$SG"):
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# fuck me. if we start a new definition, and have an old one, add the old one...
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if current_datareuse_entry != None:
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carrier.add_datareuse_fixup(current_datareuse_entry)
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current_datareuse_entry = None # reset it here
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var_name = tokens[0]
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data = convert_asm_db_to_bytes(line[line.index("DB"):])
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current_datareuse_entry = DataReuseEntry(var_name)
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current_datareuse_entry.data = data
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lines_out.append("; " + line)
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continue
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if line.startswith("\tDB"):
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if current_datareuse_entry == None:
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raise("Found DB without $SG, corrupted asm file?")
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current_datareuse_entry.data += convert_asm_db_to_bytes(line)
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lines_out.append("; " + line)
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continue
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if current_datareuse_entry != None:
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# when we reach here, $SG with its DB should be done.
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carrier.add_datareuse_fixup(current_datareuse_entry)
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current_datareuse_entry = None # reset it here
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# PATCH data reuse code (data from C)
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# put $SGxxxxxx into .rdata section
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## lea rcx, OFFSET FLAT:$SG72751
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## to
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## DB 07cH, 04cH, 028H, 0b0H, 006H, 07eH ; IAT Reuse for GetEnvironmentVariableW
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if "OFFSET FLAT:$SG" in line:
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string_ref = line.split("OFFSET FLAT:")[1]
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register = line.split("lea\t")[1].split(",")[0]
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randbytes: bytes = os.urandom(7)
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datareuse_fixup = carrier.get_all_reusedata_fixup(string_ref)
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if datareuse_fixup == None:
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raise("Data reuse entry not found: {}".format(string_ref))
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datareuse_fixup.register = register
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datareuse_fixup.randbytes = randbytes
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line = bytes_to_asm_db(randbytes) + " ; .rdata Reuse for {} ({})".format(
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string_ref, register)
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lines_out.append(line)
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continue
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lines_out.append(line)
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with open(filename, "w") as f:
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for line in lines_out:
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f.write(line + "\n")
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def convert_asm_db_to_bytes(line: str) -> bytes:
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value = b''
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parts = line.split()
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for part in parts:
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if part.startswith('\''):
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value += str.encode(part.split('\'')[1])
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elif part.endswith('H') or part.endswith('H,'):
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hex = part.split('H')[0]
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value += bytes.fromhex(hex)
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return value
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def bytes_to_asm_db(byte_data: bytes) -> bytes:
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# Convert each byte to a string in hexadecimal format
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# prefixed with '0' and suffixed with 'h'
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hex_values = [f"0{byte:02x}H" for byte in byte_data]
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formatted_string = ', '.join(hex_values)
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return "\tDB " + formatted_string
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+7
-128
@@ -9,12 +9,13 @@ from config import config
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from observer import observer
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from model import *
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from phases.masmshc import process_file, Params
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from phases.datareuse import *
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from model.carrier import Carrier
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from model.exehost import ExeHost
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from phases.asmparser import parse_asm_file
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logger = logging.getLogger("Compiler")
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# NOTE: Mostly copy-pasted from compiler.py::compile()
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def compile_dev(
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c_in: FilePath,
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@@ -82,22 +83,10 @@ def compile(
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file_to_lf(asm_out)
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observer.add_text_file("carrier_asm_orig", file_readall_text(asm_out))
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# DataReuse first
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asmFileParser = ReusedataAsmFileParser(asm_out)
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asmFileParser.init()
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asmFileParser.process()
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carrier.set_datareuse_fixups(asmFileParser.get_reusedata_fixups())
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asmFileParser.write_lines_to(asm_out)
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# Fixup assembly file
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parse_asm_file(carrier, asm_out)
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# Assembly text fixup (SuperMega)
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logger.info("---[ ASM Fixup : {} ".format(asm_out))
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if not fixup_asm_file(asm_out, payload_len, short_call_patching=short_call_patching):
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raise Exception("Error: Fixup failed")
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if config.debug:
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observer.add_text_file("carrier_asm_fixup", file_readall_text(asm_out))
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# Assembly cleanup (masm_shc)
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# Cleanup assembly file
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asm_clean_file = asm_out + ".clean"
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logger.info("---[ ASM masm_shc: {} ".format(asm_out))
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params = Params(asm_out, asm_clean_file,
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@@ -105,122 +94,12 @@ def compile(
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remove_crt=True,
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append_rsp_stub=True) # required atm
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process_file(params)
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if not os.path.isfile(asm_clean_file):
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raise Exception("Error: Cleaned up ASM file {} was not created".format(
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asm_clean_file
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))
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if source_style == FunctionInvokeStyle.iat_reuse:
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fixup_iat_reuse(asm_clean_file, carrier)
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observer.add_text_file("carrier_asm_updated", file_readall_text(asm_clean_file))
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if not exe_host.has_all_carrier_functions(carrier):
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logger.error("Error: Not all carrier functions are available in the target exe")
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return
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# Move to destination we expect
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shutil.move(asm_clean_file, asm_out)
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if config.debug:
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observer.add_text_file("carrier_asm_cleanup", file_readall_text(asm_out))
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def bytes_to_asm_db(byte_data: bytes) -> bytes:
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# Convert each byte to a string in hexadecimal format
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# prefixed with '0' and suffixed with 'h'
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hex_values = [f"0{byte:02x}H" for byte in byte_data]
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formatted_string = ', '.join(hex_values)
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return "\tDB " + formatted_string
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def fixup_asm_file(filename: FilePath, payload_len: int, short_call_patching: bool = False):
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with open(filename, 'r') as asmfile: # None = translate to \n
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lines = asmfile.readlines()
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# When it breaks, enable this
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if short_call_patching:
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for idx, line in enumerate(lines):
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if "jmp\tSHORT" in lines[idx]:
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lines[idx] = lines[idx].replace("SHORT", "")
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for idx, line in enumerate(lines):
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# Remove EXTRN, we dont need it
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# Even tho it is part of IAT_REUSE process (see fixup_iat_reuse())
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if "EXTRN __imp_" in lines[idx]:
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lines[idx] = "; " + lines[idx]
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# replace external reference with shellcode reference
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for idx, line in enumerate(lines):
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if "supermega_payload" in lines[idx]:
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logger.info(" > Replace external reference at line: {}".format(idx))
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#lines[idx] = lines[idx].replace(
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# "mov r8, QWORD PTR supermega_payload",
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# "lea r8, [shcstart]"
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#)
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# better keep register (hack)
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lines[idx] = lines[idx].replace(
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"mov ",
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"lea "
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)
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lines[idx] = lines[idx].replace(
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"QWORD PTR supermega_payload",
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"[shcstart] ; get payload shellcode address"
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)
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# add label at end of code
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for idx, line in enumerate(lines):
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if lines[idx].startswith("END"):
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logger.info(" > Add end of code label at line: {}".format(idx))
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lines.insert(idx-1, "shcstart: ; start of payload shellcode\n")
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break
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with open(filename, 'w',) as asmfile: # write back with CRLF
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#for line in lines:
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# asmfile.write(line + "\n")
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asmfile.writelines(lines)
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return True
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def get_function_stubs(asm_in: FilePath) -> List[str]:
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functions = []
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with open(asm_in, 'r', encoding='utf-8') as asmfile:
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lines = asmfile.readlines()
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# EXTRN __imp_GetEnvironmentVariableW:PROC
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for line in lines:
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if "QWORD PTR __imp_" in line:
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a = line
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a = a.split("__imp_")[1]
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func_name = a.strip("\r\n")
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print(" > loader shellcode IAT requirement: {}".format(func_name))
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functions.append(func_name)
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return functions
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def fixup_iat_reuse(filename: FilePath, carrier: Carrier):
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with open(filename, 'r', encoding='utf-8') as asmfile:
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lines = asmfile.readlines()
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# do IAT reuse
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for idx, line in enumerate(lines):
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# Fix call
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# call QWORD PTR __imp_GetEnvironmentVariableW
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if "call" in lines[idx] and "__imp_" in lines[idx]:
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func_name = lines[idx][lines[idx].find("__imp_")+6:].rstrip()
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randbytes: bytes = os.urandom(6)
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lines[idx] = bytes_to_asm_db(randbytes) + " ; IAT Reuse for {}".format(func_name)
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lines[idx] += "\n"
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carrier.add_iat_request(func_name, randbytes)
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logger.info(" > Replace func name: {} with {}".format(
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func_name, randbytes.hex()))
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with open(filename, 'w') as asmfile:
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asmfile.writelines(lines)
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if config.debug:
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observer.add_text_file("carrier_asm_iat_patch", file_readall_text(filename))
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# Log result
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observer.add_text_file("carrier_asm_cleanup", file_readall_text(asm_out))
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@@ -1,103 +0,0 @@
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import sys
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import pefile
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from intervaltree import Interval, IntervalTree
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from typing import List, Dict
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import os
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from model.carrier import DataReuseEntry
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def bytes_to_asm_db(byte_data: bytes) -> bytes:
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# Convert each byte to a string in hexadecimal format
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# prefixed with '0' and suffixed with 'h'
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hex_values = [f"0{byte:02x}H" for byte in byte_data]
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formatted_string = ', '.join(hex_values)
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return "\tDB " + formatted_string
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class ReusedataAsmFileParser():
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def __init__(self, filepath):
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self.filepath = filepath
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self.lines = []
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self.fixups: Dict[str, DataReuseEntry] = {}
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def get_reusedata_fixups(self) -> List[DataReuseEntry]:
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return list(self.fixups.values())
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def init(self):
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with open(self.filepath, "r") as f:
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self.lines = f.readlines()
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self.lines = [line.rstrip() for line in self.lines]
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def process(self):
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self.fixup_data_reuse_code()
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self.fixup_data_reuse_data()
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def fixup_data_reuse_code(self):
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fixups = []
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# lea rcx, OFFSET FLAT:$SG72513
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for idx, line in enumerate(self.lines):
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if "OFFSET FLAT:$SG" in line:
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string_ref = line.split("OFFSET FLAT:")[1]
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register = line.split("lea\t")[1].split(",")[0]
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randbytes: bytes = os.urandom(7) # lea is 7 bytes
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self.fixups[string_ref] = DataReuseEntry(string_ref, register, randbytes)
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self.lines[idx] = bytes_to_asm_db(randbytes) + " ; .rdata Reuse for {} ({})".format(
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string_ref, register)
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return fixups
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def fixup_data_reuse_data(self) -> List[str]:
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current_entry_name = ""
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for line in self.lines:
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# $SG72513 DB 'U', 00H, 'S', 00H, 'E', 00H, 'R', 00H, 'P', 00H, 'R', 00H
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# DB 'O', 00H, 'F', 00H, 'I', 00H, 'L', 00H, 'E', 00H, 00H, 00H
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if line.startswith("$SG"):
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parts = line.split()
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name = parts[0]
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current_entry_name = name
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value = b''
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for part in parts:
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if part.startswith('\''):
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value += str.encode(part.split('\'')[1])
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elif part.endswith('H') or part.endswith('H,'):
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hex = part.split('H')[0]
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value += bytes.fromhex(hex)
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if not name in self.fixups:
|
||||
raise Exception("DataReuse: Entry {} not found in fixups".format(name))
|
||||
self.fixups[name].data = value
|
||||
|
||||
|
||||
elif line.startswith("\tDB"):
|
||||
if current_entry_name == "":
|
||||
continue
|
||||
value = b''
|
||||
parts = line.split()
|
||||
for part in parts:
|
||||
if part.startswith('\''):
|
||||
value += str.encode(part.split('\'')[1])
|
||||
elif part.endswith('H') or part.endswith('H,'):
|
||||
hex = part.split('H')[0]
|
||||
if len(hex) == 3:
|
||||
hex = hex.lstrip('0')
|
||||
value += bytes.fromhex(hex)
|
||||
|
||||
if not name in self.fixups:
|
||||
raise Exception("DataReuse: Entry {} not found in fixups".format(name))
|
||||
self.fixups[name].data += value
|
||||
|
||||
else:
|
||||
current_entry_name = ""
|
||||
|
||||
|
||||
def write_lines_to(self, filename):
|
||||
with open(filename, 'w',) as asmfile:
|
||||
for line in self.lines:
|
||||
asmfile.write(line + "\n")
|
||||
|
||||
+5
-4
@@ -3,7 +3,7 @@ from typing import List
|
||||
import unittest
|
||||
import logging
|
||||
|
||||
from phases.compiler import fixup_asm_file, fixup_iat_reuse
|
||||
from phases.asmparser import parse_asm_file
|
||||
from model.exehost import ExeHost
|
||||
from model.defs import *
|
||||
from model.carrier import Carrier
|
||||
@@ -18,9 +18,10 @@ class AsmTest(unittest.TestCase):
|
||||
def test_asm_fixup(self):
|
||||
path_in: FilePath = "tests/data/peb_walk_pre_fixup.asm"
|
||||
path_working: FilePath = "tests/data/peb_walk_pre_fixup.asm.test"
|
||||
carrier = Carrier()
|
||||
|
||||
shutil.copy(path_in, path_working)
|
||||
fixup_asm_file(path_working, 272)
|
||||
parse_asm_file(carrier, path_working)
|
||||
with open(path_working, "r") as f:
|
||||
lines = f.readlines()
|
||||
|
||||
@@ -35,7 +36,7 @@ class AsmTest(unittest.TestCase):
|
||||
self.assertTrue("supermega_payload" not in lines[198-1])
|
||||
|
||||
# shcstart:
|
||||
self.assertTrue("shcstart:" in lines[213-1])
|
||||
self.assertTrue("shcstart:" in lines[212-1])
|
||||
|
||||
os.remove(path_working)
|
||||
|
||||
@@ -46,7 +47,7 @@ class AsmTest(unittest.TestCase):
|
||||
shutil.copy(path_in, path_working)
|
||||
|
||||
carrier = Carrier()
|
||||
fixup_iat_reuse(path_working, carrier)
|
||||
parse_asm_file(carrier, path_working)
|
||||
|
||||
self.assertEqual(len(carrier.iat_requests), 2)
|
||||
|
||||
|
||||
+20
-14
@@ -5,7 +5,9 @@ import logging
|
||||
import os
|
||||
from model.defs import *
|
||||
from model.exehost import ExeHost
|
||||
from phases.datareuse import ReusedataAsmFileParser
|
||||
from model.carrier import Carrier
|
||||
from phases.asmparser import parse_asm_file
|
||||
|
||||
|
||||
class DataReuseTest(unittest.TestCase):
|
||||
def test_relocation_list(self):
|
||||
@@ -40,12 +42,12 @@ class DataReuseTest(unittest.TestCase):
|
||||
|
||||
def test_data_reuse_entries(self):
|
||||
asm_in = "tests/data/data_reuse_pre_fixup.asm"
|
||||
data_reuse_entries = []
|
||||
|
||||
asmFileParser = ReusedataAsmFileParser(asm_in)
|
||||
asmFileParser.init()
|
||||
asmFileParser.process()
|
||||
data_reuse_entries = asmFileParser.get_reusedata_fixups()
|
||||
asm_working = "tests/data/data_reuse_pre_fixup.asm.test"
|
||||
|
||||
shutil.copy(asm_in, asm_working)
|
||||
carrier = Carrier()
|
||||
parse_asm_file(carrier, asm_working)
|
||||
data_reuse_entries = carrier.get_all_reusedata_fixups()
|
||||
|
||||
self.assertEqual(2, len(data_reuse_entries))
|
||||
|
||||
@@ -59,16 +61,20 @@ class DataReuseTest(unittest.TestCase):
|
||||
entry = data_reuse_entries[1]
|
||||
self.assertTrue('$SG72514' in entry.string_ref)
|
||||
|
||||
os.remove(asm_working)
|
||||
|
||||
|
||||
def test_data_reuse_fixup(self):
|
||||
asm_in = "tests/data/data_reuse_pre_fixup.asm"
|
||||
asm_out = asm_in + ".test"
|
||||
asmFileParser = ReusedataAsmFileParser(asm_in)
|
||||
asmFileParser.init()
|
||||
asmFileParser.process()
|
||||
asmFileParser.write_lines_to(asm_out + ".test")
|
||||
with open(asm_out + ".test", "r") as f:
|
||||
asm_working = asm_in + ".test"
|
||||
|
||||
shutil.copy(asm_in, asm_working)
|
||||
carrier = Carrier()
|
||||
parse_asm_file(carrier, asm_working)
|
||||
|
||||
with open(asm_working, "r") as f:
|
||||
lines = f.readlines()
|
||||
self.assertTrue("\tDB " in lines[108-1])
|
||||
self.assertFalse("OFFSET FLAT:$SG" in lines[108-1])
|
||||
os.remove(asm_out + ".test")
|
||||
|
||||
os.remove(asm_working)
|
||||
|
||||
Reference in New Issue
Block a user