mirror of
https://github.com/DosX-dev/Astral-PE
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DosX
67 lines
3.2 KiB
C#
67 lines
3.2 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 LargeAddressAwareSetter : IAstralPeModule {
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/// <summary>
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/// Sets the IMAGE_FILE_LARGE_ADDRESS_AWARE flag in IMAGE_FILE_HEADER.Characteristics.
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/// Does nothing if the flag is already set.
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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 ushort IMAGE_FILE_LARGE_ADDRESS_AWARE = 0x0020; // Flag to allow >2 GB address space on 64-bit
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int fileHeaderOffset = e_lfanew + 4, // Skip PE signature "PE\0\0"
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characteristicsOffset = fileHeaderOffset + 18; // Offset to Characteristics field
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// Check for bounds safety
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if (characteristicsOffset + 2 > raw.Length)
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throw new IndexOutOfRangeException("Characteristics field is outside of file bounds.");
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// Read current flags
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ushort current = BitConverter.ToUInt16(raw, characteristicsOffset);
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if ((current & IMAGE_FILE_LARGE_ADDRESS_AWARE) != 0)
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return;
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// Set flag and write back
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current |= IMAGE_FILE_LARGE_ADDRESS_AWARE;
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byte[] updated = BitConverter.GetBytes(current);
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raw[characteristicsOffset] = updated[0];
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raw[characteristicsOffset + 1] = updated[1];
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}
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}
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} |