Better file format 1

This commit is contained in:
Pyrex 2025-04-25 21:30:11 -07:00
parent f5cb818123
commit b20846c797
14 changed files with 213 additions and 688 deletions

3
analyzer/.vscode/settings.json vendored Normal file
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@ -0,0 +1,3 @@
{
"python.analysis.typeCheckingMode": "standard"
}

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7
analyzer/format.txt Normal file
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@ -0,0 +1,7 @@
[entry point]
[number of libraries]
<Library> <Import1> <Import1Addr> <Import2> <Import2Addr> 00: Import the following things. (Terminate on 00)
[number of bytes in starting state as a uint32_t]
00 [00-ff] <bytes>: Use the following 00-ff bytes literally
[01-ff] <byte>: Repeat the next byte 02 to ff times

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@ -1,80 +1,124 @@
import base64
from dataclasses import dataclass
from io import BytesIO
import json
from typing import Generator
import pefile
def main():
subject = pefile.PE("subjects\\main.exe")
@dataclass
class Import:
library: bytes
procedures: list[tuple[bytes, int]]
def _single_or_none(x):
items = [i for i in x]
if len(items) == 0:
return None
assert len(items) == 1
@dataclass
class Binary(object):
starting_state: bytes
entry_point: int
imports: list[Import]
def _single_or_none[T](ts: Generator[T]) -> T | None:
items = [t for t in ts]
if len(items) == 0:
return None
if len(items) == 1:
return items[0]
def _dump(fname, section):
with open(fname, "wb") as f:
if section is not None:
if isinstance(section, bytes):
f.write(section)
else:
f.write(section.get_data())
raise ValueError(f"expected 1 or 0, got {len(items)}")
for i in subject.sections:
print(i)
def _single[T](ts: Generator[T]) -> T:
items = [t for t in ts]
if len(items) == 1:
return items[0]
text_section = _single_or_none(i for i in subject.sections if i.Name == b".text\0\0\0")
raise ValueError(f"expected 1, got {len(items)}")
def _create_binary(subject: pefile.PE) -> Binary:
optional_header = subject.OPTIONAL_HEADER
assert isinstance(optional_header, pefile.Structure)
text_section = _single(i for i in subject.sections if i.Name == b".text\0\0\0")
data_section = _single_or_none(i for i in subject.sections if i.Name == b".data\0\0\0")
rdata_section = _single_or_none(i for i in subject.sections if i.Name == b".rdata\0\0")
_dump("dumps\\text.dat", text_section)
_dump("dumps\\data.dat", data_section)
_dump("dumps\\rdata.dat", rdata_section)
relevant_sections = [section for section in (text_section, data_section, rdata_section) if section is not None]
if len(relevant_sections) == 0:
raise ValueError("no sections to plot")
print([(i.VirtualAddress, i) for i in relevant_sections])
min_address = min(i.VirtualAddress for i in relevant_sections)
max_address = max(_round_up_to_page(i.VirtualAddress + i.SizeOfRawData) for i in relevant_sections)
print(min_address, max_address)
buffer = bytearray(max_address - min_address)
for section in relevant_sections:
data = section.get_data() # TODO: De-pad the text section from 0xccs
start = section.VirtualAddress - min_address
buffer[start:start+len(data)] = data
buffer = bytes(buffer)
_dump("dumps\\starting_state.dat", buffer)
starting_state = bytes(buffer)
binary = {
"startingState": base64.b64encode(buffer).decode("utf8"),
"imports": [],
}
entry_point_rva = getattr(optional_header, "AddressOfEntryPoint")
print(entry_point_rva)
entry_point = (entry_point_rva - min_address)
# find imports
# print(subject)
# print(dir(subject))
for entry in subject.DIRECTORY_ENTRY_IMPORT:
# print(entry.dll)
imports: list[Import] = []
for entry in getattr(subject, "DIRECTORY_ENTRY_IMPORT"):
library: bytes = entry.dll
procedures: list[tuple[bytes, int]] = []
for imp in entry.imports:
# print(dir(imp))
import_address = imp.address - subject.OPTIONAL_HEADER.ImageBase - min_address
print(hex(import_address), imp.name)
binary["imports"].append({
"dll": entry.dll.decode("utf8"),
"symbol": imp.name.decode("utf8"),
"address": import_address,
})
import_address_rva = imp.address - getattr(optional_header, "ImageBase")
import_address = import_address_rva - min_address
procedures.append((imp.name, import_address))
entry_point_rva = subject.OPTIONAL_HEADER.AddressOfEntryPoint
binary["entryPoint"] = entry_point_rva - min_address
with open("binaries/main.json", "wt") as f:
f.write(json.dumps(binary, indent=4))
imports.append(Import(library, procedures))
return Binary(
starting_state=starting_state,
entry_point=entry_point,
imports=imports,
)
def _encode_binary(binary: Binary) -> bytes:
out = BytesIO()
def _write_u32(n: int):
out.write(n.to_bytes(4, "little", signed=False))
def _write_u8(n: int):
out.write(n.to_bytes(1, "little", signed=False))
def _write_zt(s: bytes):
out.write(s)
_write_u8(0)
_write_u32(binary.entry_point)
for i in binary.imports:
print(i.library)
_write_zt(i.library)
print(i.procedures)
for (procedure, address) in i.procedures:
_write_zt(procedure)
_write_u32(address)
_write_u8(0)
_write_u8(0)
_write_u32(len(binary.starting_state))
# TODO: No RLE for now
for b in binary.starting_state:
_write_u8(b)
return out.getbuffer()
def main():
subject = pefile.PE("subjects\\main.exe")
binary = _create_binary(subject)
code = _encode_binary(binary)
with open("binaries\\main.dat", "wb") as f:
f.write(code)
def _round_up_to_page(x: int):
# TODO: Is this the page size on x64? I think it is

4
analyzer/poetry.lock generated
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@ -13,5 +13,5 @@ files = [
[metadata]
lock-version = "2.0"
python-versions = "^3.10"
content-hash = "6f28e4dc3bf3b09c57354693b75dc7975b70a7aac2ee7c83fc81b0058520d7f9"
python-versions = "^3.13"
content-hash = "8e680dad2071f9d7a37ca34d4fd6da67ba3922e0de45f0442c7b38d07f8fa9f0"

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@ -6,7 +6,7 @@ authors = ["Nyeogmi <economicsbat@gmail.com>"]
readme = "README.md"
[tool.poetry.dependencies]
python = "^3.10"
python = "^3.13"
pefile = "^2024.8.26"

482
runner/Cargo.lock generated
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@ -2,261 +2,6 @@
# It is not intended for manual editing.
version = 4
[[package]]
name = "android-tzdata"
version = "0.1.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e999941b234f3131b00bc13c22d06e8c5ff726d1b6318ac7eb276997bbb4fef0"
[[package]]
name = "android_system_properties"
version = "0.1.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
dependencies = [
"libc",
]
[[package]]
name = "autocfg"
version = "1.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26"
[[package]]
name = "base64"
version = "0.22.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
[[package]]
name = "bumpalo"
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[[package]]
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[[package]]
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"syn",
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[[package]]
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[[package]]
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dependencies = [
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"core-foundation-sys",
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"js-sys",
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]
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
name = "proc-macro2"
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@ -279,26 +24,10 @@ dependencies = [
name = "runner"
version = "0.1.0"
dependencies = [
"serde",
"serde_bytes",
"serde_json",
"serde_with",
"windows-sys",
"winres",
]
[[package]]
name = "rustversion"
version = "1.0.20"
source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
name = "ryu"
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source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "28d3b2b1366ec20994f1fd18c3c594f05c5dd4bc44d8bb0c1c632c8d6829481f"
[[package]]
name = "serde"
version = "1.0.219"
@ -308,15 +37,6 @@ dependencies = [
"serde_derive",
]
[[package]]
name = "serde_bytes"
version = "0.11.17"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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]
[[package]]
name = "serde_derive"
version = "1.0.219"
@ -328,60 +48,6 @@ dependencies = [
"syn",
]
[[package]]
name = "serde_json"
version = "1.0.140"
source = "registry+https://github.com/rust-lang/crates.io-index"
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"serde",
]
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"indexmap 2.9.0",
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"serde_derive",
"serde_json",
"serde_with_macros",
"time",
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@ -393,37 +59,6 @@ dependencies = [
"unicode-ident",
]
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@ -439,123 +74,6 @@ version = "1.0.18"
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"windows-strings",
]
[[package]]
name = "windows-implement"
version = "0.60.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a47fddd13af08290e67f4acabf4b459f647552718f683a7b415d290ac744a836"
dependencies = [
"proc-macro2",
"quote",
"syn",
]
[[package]]
name = "windows-interface"
version = "0.59.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bd9211b69f8dcdfa817bfd14bf1c97c9188afa36f4750130fcdf3f400eca9fa8"
dependencies = [
"proc-macro2",
"quote",
"syn",
]
[[package]]
name = "windows-link"
version = "0.1.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "76840935b766e1b0a05c0066835fb9ec80071d4c09a16f6bd5f7e655e3c14c38"
[[package]]
name = "windows-result"
version = "0.3.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c64fd11a4fd95df68efcfee5f44a294fe71b8bc6a91993e2791938abcc712252"
dependencies = [
"windows-link",
]
[[package]]
name = "windows-strings"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7a2ba9642430ee452d5a7aa78d72907ebe8cfda358e8cb7918a2050581322f97"
dependencies = [
"windows-link",
]
[[package]]
name = "windows-sys"
version = "0.59.0"

View File

@ -4,10 +4,6 @@ version = "0.1.0"
edition = "2021"
[dependencies]
serde = {version = "1.0.219", features=["derive"]}
serde_bytes = "0.11.17"
serde_json = "1.0.140"
serde_with = {version="3.12.0", features=["base64"]}
windows-sys = {version="0.59.0", features=["Win32_System_Memory", "Win32_System_LibraryLoader", "Win32_System_Diagnostics_ToolHelp", "Win32_System_Threading", "Win32_System_Diagnostics_Debug", "Win32_Security"]}
[build-dependencies]

BIN
runner/binaries/main.dat Normal file

Binary file not shown.

File diff suppressed because one or more lines are too long

View File

@ -1,14 +1,11 @@
use core::str;
use std::ffi::{c_void, CStr};
use std::marker::PhantomData;
use std::mem::MaybeUninit;
use std::ptr;
use std::{fs::File, io::Read};
use serde::Deserialize;
use serde_with::base64::{Base64, Standard};
use serde_with::formats::Padded;
use serde_with::serde_as;
use windows_sys::Win32::Foundation::{GetLastError, PROC};
use windows_sys::Win32::Foundation::GetLastError;
use windows_sys::Win32::System::Diagnostics::Debug;
use windows_sys::Win32::System::Diagnostics::ToolHelp::{self, PROCESSENTRY32};
use windows_sys::Win32::System::Memory;
@ -18,30 +15,35 @@ use windows_sys::Win32::System::{LibraryLoader, Threading};
const LOAD_LIBRARY_A: *const c_void = LibraryLoader::LoadLibraryA as *const c_void;
const GET_PROC_ADDRESS: *const c_void = LibraryLoader::GetProcAddress as *const c_void;
#[serde_as]
#[derive(Debug, Deserialize)]
struct Import {
#[serde(with = "serde_bytes")]
dll: Vec<u8>,
#[serde(with = "serde_bytes")]
symbol: Vec<u8>,
address: usize,
}
#[serde_as]
#[derive(Debug, Deserialize)]
struct Binary {
#[serde(rename = "startingState")]
#[serde_as(as = "Base64<Standard, Padded>")]
starting_state: Vec<u8>,
imports: Vec<Import>,
#[serde(rename = "entryPoint")]
entry_point: usize,
}
fn main() {
unsafe { _main_remote() }
}
struct Reader<'a> {
phantom: PhantomData<&'a [u8]>,
ptr: *const u8,
}
impl<'a> Reader<'a> {
unsafe fn read<T: Copy>(&mut self) -> T {
let value = core::ptr::read_unaligned(self.ptr as *const T);
self.ptr = self.ptr.byte_add(core::mem::size_of::<T>());
value
}
unsafe fn read_zt(&mut self) -> &'a [u8] {
let start = self.ptr;
let mut n = 0;
while *self.ptr != 0 {
self.ptr = self.ptr.byte_add(1);
n += 1
}
self.ptr = self.ptr.byte_add(1);
n += 1; // include the null terminator
return std::slice::from_raw_parts(start, n);
}
}
struct LocalWriter {
binary: *mut u8,
base: *mut u8,
@ -64,12 +66,6 @@ trait CodeGen {
unsafe fn address_in_binary(&mut self, offset: usize) -> *const c_void;
}
impl Measurer {
fn round_up(&mut self) {
self.count = (self.count + 15) / 16 * 16;
}
}
impl CodeGen for LocalWriter {
unsafe fn write(&mut self, u8s: &[u8]) -> *const c_void {
let addr = self.ptr;
@ -91,82 +87,109 @@ impl CodeGen for Measurer {
return ptr::null();
}
unsafe fn address_in_binary(&mut self, offset: usize) -> *const c_void {
unsafe fn address_in_binary(&mut self, _: usize) -> *const c_void {
return ptr::null();
}
}
unsafe fn write_imports(
strings: &mut impl CodeGen,
code: &mut impl CodeGen,
original_entry_point: usize,
imports: &[Import],
prelude: &mut impl CodeGen,
reader: &mut Reader,
) {
let entry_point = reader.read::<u32>();
println!("entry point: {}", entry_point);
// push rbp
code.write(&[0x55]);
prelude.write(&[0x55]);
// mov rbp, rsp
code.write(&[0x48, 0x89, 0xe5]);
prelude.write(&[0x48, 0x89, 0xe5]);
// nop
code.write(&[0x90]);
prelude.write(&[0x90]);
// sub rsp, 0x20
code.write(&[0x48, 0x83, 0xec, 0x20]);
prelude.write(&[0x48, 0x83, 0xec, 0x20]);
// windows needs 32 bytes to clobber: https://en.wikipedia.org/wiki/X86_calling_conventions#Microsoft_x64_calling_convention
for import in imports {
let library_addr = strings.write(&import.dll);
strings.write(&[0]);
let symbol_addr = strings.write(&import.symbol);
loop {
let dll = reader.read_zt();
if dll.len() == 1 {
break;
}
println!("import dll: {:?}", str::from_utf8(dll).unwrap());
let library_addr = strings.write(dll);
strings.write(&[0]);
// mov rcx, library name
code.write(&[0x48, 0xb9]);
code.write_ptr(library_addr);
// mov rax, LoadLibraryA
code.write(&[0x48, 0xb8]);
code.write_ptr(LOAD_LIBRARY_A);
// call rax
code.write(&[0xff, 0xd0]);
loop {
let symbol = reader.read_zt();
if symbol.len() == 1 {
break;
}
println!("import symbol: {:?}", str::from_utf8(symbol).unwrap());
// mov rcx, rax
code.write(&[0x48, 0x89, 0xc1]);
// mov rdx, symbol name
code.write(&[0x48, 0xba]);
code.write_ptr(symbol_addr);
// mov rax, GetProcAddress
code.write(&[0x48, 0xb8]);
code.write_ptr(GET_PROC_ADDRESS);
// call rax
code.write(&[0xff, 0xd0]);
// mov [import address], rax
code.write(&[0x48, 0xa3]);
let addr = code.address_in_binary(import.address);
code.write_ptr(addr);
let dest = reader.read::<u32>();
let symbol_addr = strings.write(symbol);
// mov rcx, library name
prelude.write(&[0x48, 0xb9]);
prelude.write_ptr(library_addr);
// mov rax, LoadLibraryA
prelude.write(&[0x48, 0xb8]);
prelude.write_ptr(LOAD_LIBRARY_A);
// call rax
prelude.write(&[0xff, 0xd0]);
// mov rcx, rax
prelude.write(&[0x48, 0x89, 0xc1]);
// mov rdx, symbol name
prelude.write(&[0x48, 0xba]);
prelude.write_ptr(symbol_addr);
// mov rax, GetProcAddress
prelude.write(&[0x48, 0xb8]);
prelude.write_ptr(GET_PROC_ADDRESS);
// call rax
prelude.write(&[0xff, 0xd0]);
// mov [import address], rax
prelude.write(&[0x48, 0xa3]);
let addr = prelude.address_in_binary(dest as usize);
prelude.write_ptr(addr);
}
}
// mov rax, original entry point
code.write(&[0x48, 0xb8]);
let addr = code.address_in_binary(original_entry_point);
prelude.write(&[0x48, 0xb8]);
let addr = prelude.address_in_binary(entry_point as usize);
// let addr = load_library_a;
code.write_ptr(addr);
prelude.write_ptr(addr);
// call rax
code.write(&[0xff, 0xd0]);
prelude.write(&[0xff, 0xd0]);
// leave, ret
code.write(&[0xc9, 0xc3]);
prelude.write(&[0xc9, 0xc3]);
}
unsafe fn write_starting_state(binary: *mut u8, reader: &mut Reader) {
let length = reader.read::<u32>() as usize;
let ptr = reader.ptr;
println!("length: {:?}", length);
binary.copy_from(ptr, length);
}
unsafe fn _main_remote() {
let mut input = File::open("binaries/main.json").unwrap();
let mut input = File::open("binaries/main.dat").unwrap();
let mut buf: Vec<u8> = vec![];
let _ = input.read_to_end(&mut buf).unwrap();
let binary = serde_json::from_slice::<Binary>(&buf).unwrap();
let mut measuring_reader = Reader {
phantom: PhantomData,
ptr: buf.as_ptr(),
};
let mut string_measurer = Measurer { count: 0 };
let mut code_measurer = Measurer { count: 0 };
write_imports(
&mut string_measurer,
&mut code_measurer,
binary.entry_point,
&binary.imports,
&mut measuring_reader,
);
let starting_state_len = measuring_reader.read::<u32>() as usize;
println!("starting state len: {}", starting_state_len);
// string_measurer.round_up();
// code_measurer.round_up();
@ -180,7 +203,7 @@ unsafe fn _main_remote() {
println!("got null");
return;
}
let total_size = binary.starting_state.len() + string_measurer.count + code_measurer.count;
let total_size = starting_state_len as usize + string_measurer.count + code_measurer.count;
let remote_address_space = Memory::VirtualAllocEx(
remote,
ptr::null(),
@ -195,12 +218,12 @@ unsafe fn _main_remote() {
Memory::PAGE_EXECUTE_READWRITE,
);
local_address_space.copy_from(
binary.starting_state.as_ptr() as *const c_void,
binary.starting_state.len(),
);
let mut loading_reader = Reader {
phantom: PhantomData,
ptr: buf.as_ptr(),
};
let strings = local_address_space.byte_add(binary.starting_state.len());
let strings = local_address_space.byte_add(starting_state_len);
let prelude = strings.byte_add(string_measurer.count);
let mut strings_writer = LocalWriter {
binary: remote_address_space as *mut u8,
@ -212,12 +235,15 @@ unsafe fn _main_remote() {
base: local_address_space as *mut u8,
ptr: prelude as *mut u8,
};
println!("writing imports");
write_imports(
&mut strings_writer,
&mut prelude_writer,
binary.entry_point,
&binary.imports,
&mut loading_reader,
);
println!("writing starting state");
write_starting_state(local_address_space as *mut u8, &mut loading_reader);
println!("done!");
println!("error: {}", GetLastError());
println!(
"Copying memory to foreign process (at {:?} from {:?} get {:?})",
@ -234,7 +260,7 @@ unsafe fn _main_remote() {
println!("Creating remote thread");
let entry_point =
remote_address_space.byte_add(binary.starting_state.len() + string_measurer.count);
remote_address_space.byte_offset(prelude.byte_offset_from(local_address_space));
println!("Entry point: {:?}", entry_point);
Threading::CreateRemoteThread(
remote,
@ -269,56 +295,3 @@ unsafe fn identify_victim() -> Option<u32> {
}
return None;
}
/*
unsafe fn _main_local() {
let mut input = File::open("binaries/main.json").unwrap();
let mut buf: Vec<u8> = vec![];
let _ = input.read_to_end(&mut buf).unwrap();
let binary = serde_json::from_slice::<Binary>(&buf).unwrap();
let mut string_measurer = Measurer { count: 0 };
let mut code_measurer = Measurer { count: 0 };
write_imports(
&mut string_measurer,
&mut code_measurer,
binary.entry_point,
&binary.imports,
);
// TODO: Alignment
let address_space = Memory::VirtualAlloc(
ptr::null(),
binary.starting_state.len() + string_measurer.count + code_measurer.count,
Memory::MEM_COMMIT | Memory::MEM_RESERVE,
Memory::PAGE_EXECUTE_READWRITE,
);
address_space.copy_from(
binary.starting_state.as_ptr() as *const c_void,
binary.starting_state.len(),
);
let strings = address_space.byte_add(binary.starting_state.len());
let prelude = strings.byte_add(string_measurer.count);
let mut strings_writer = LocalWriter {
binary: address_space as *mut u8,
ptr: strings as *mut u8,
};
let mut prelude_writer = LocalWriter {
binary: address_space as *mut u8,
ptr: prelude as *mut u8,
};
write_imports(
&mut strings_writer,
&mut prelude_writer,
binary.entry_point,
&binary.imports,
);
let function: unsafe extern "C" fn() -> *const c_void = std::mem::transmute(prelude);
let result = function();
}
*/