mirror of
https://github.com/DosX-dev/Astral-PE
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DosX
77 lines
3.8 KiB
C#
77 lines
3.8 KiB
C#
/*
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* This file is part of the Astral-PE project.
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* Copyright (c) 2025 DosX. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Astral-PE is a low-level post-compilation PE header mutator (obfuscator) for native
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* Windows x86/x64 binaries. It modifies structural metadata while preserving execution integrity.
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*
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* For source code, updates, and documentation, visit:
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* https://github.com/DosX-dev/Astral-PE
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*/
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using PeNet;
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namespace AstralPE.Obfuscator.Modules {
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public class MemoryReserveExpander : IAstralPeModule {
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/// <summary>
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/// Sets SizeOfStackReserve and SizeOfHeapReserve to elevated defaults
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/// if current values are below recommended thresholds.
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/// </summary>
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/// <param name="raw">Raw PE file bytes.</param>
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/// <param name="pe">Parsed PE metadata.</param>
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/// <param name="e_lfanew">Offset to IMAGE_NT_HEADERS.</param>
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/// <param name="optStart">Offset to IMAGE_OPTIONAL_HEADER.</param>
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/// <param name="sectionTableOffset">Offset to section headers.</param>
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/// <param name="rnd">Random number generator (unused).</param>
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public void Apply(ref byte[] raw, PeFile pe, int e_lfanew, int optStart, int sectionTableOffset, Random rnd) {
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const uint STACK_RESERVE = 0x02000000, // 32 MB
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HEAP_RESERVE = 0x04000000; // 64 MB
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bool is64 = pe.Is64Bit;
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int stackReserveOffset = is64 ? optStart + 0x48 : optStart + 0x40,
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heapReserveOffset = is64 ? optStart + 0x58 : optStart + 0x50;
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if (stackReserveOffset + (is64 ? 8 : 4) > raw.Length || heapReserveOffset + (is64 ? 8 : 4) > raw.Length)
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throw new IndexOutOfRangeException("Stack or heap reserve field is outside of file bounds.");
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// Stack reserve
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if (stackReserveOffset + (is64 ? 8 : 4) <= raw.Length) {
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ulong current = is64 ? BitConverter.ToUInt64(raw, stackReserveOffset) : BitConverter.ToUInt32(raw, stackReserveOffset);
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if (current < STACK_RESERVE) {
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byte[] updated = is64 ? BitConverter.GetBytes((ulong)STACK_RESERVE) : BitConverter.GetBytes(STACK_RESERVE);
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Buffer.BlockCopy(updated, 0, raw, stackReserveOffset, updated.Length);
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}
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}
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// Heap reserve
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if (heapReserveOffset + (is64 ? 8 : 4) <= raw.Length) {
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ulong current = is64 ? BitConverter.ToUInt64(raw, heapReserveOffset) : BitConverter.ToUInt32(raw, heapReserveOffset);
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if (current < HEAP_RESERVE) {
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byte[] updated = is64 ? BitConverter.GetBytes((ulong)HEAP_RESERVE) : BitConverter.GetBytes(HEAP_RESERVE);
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Buffer.BlockCopy(updated, 0, raw, heapReserveOffset, updated.Length);
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}
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}
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}
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}
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}
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