Convert standard elf files to standalone shellcodes. Please read the following documentation view the examples for this project to work
How does this work ?
The python library parses the elf and create a simple relocatable file format Then the mini loader is inserted as the entry point of the elf the mini loader will load the relocatable format and execute it. There are no special requirements, the library contain the compiled mini loaders
Supported architectures
mips
x32
Installation:
# Unfortunately only python2 is supported for now
python2 -m pip install elf_to_shellcodeCreating a shellcode
Some compilation flags are required for this to work properly. You must compile the binary with -fPIE and -static take a look at the provided examples below
Examples:
Compiling with libc
Libc has destructors and constructors this project doesn’t fully support libc. take a look at the provided example (which uses libc) and note that some function won’t work properly.
eg…
printf is using fwrite which uses the FILE * struct for stdout. this file is opened post libc initialization (in one of the libc constructors). __start is responsible for calling libc constructors and we don’t use __start (for other reasons). therefor you can’t use printf in the shellcode, but you can implement it using snprintf and write
Converting the elf to shellcode:
from elf_to_shellcode.relocate import make_shellcode
shellcode = make_shellcode(
binary_path="/tmp/binary.out",
arch="mips",
endian="big"
)
with open("myshellcode.out", 'wb') as fp:
fp.write(shellcode)Testing your shellcode
You can use the provided shellcode Loader to test you shellcodes
qemu-mips ./shellcode_loader ./myshellcode.outOutput example
Shellcode size = 66620
Allocating shellcode buffer, size = 69632
Mapping new memory, size = 69632
Jumping to shellcode, address = 0x7f7ee000
Hello from shellcode !1 maintainer
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