mirror of
https://github.com/DosX-dev/Astral-PE
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DosX
65 lines
3.3 KiB
C#
65 lines
3.3 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 DataDirCleaner : IAstralPeModule {
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/// <summary>
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/// Clears unused Data Directory entries (where the RVA is 0) in the PE file's Optional Header.
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/// The method checks all directories except the safe ones and removes any entry that has an RVA of 0.
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/// </summary>
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/// <param name="raw">The raw byte array representing the PE file.</param>
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/// <param name="pe">The parsed PE file object, used to access headers and section data.</param>
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/// <param name="e_lfanew">Offset to the IMAGE_NT_HEADERS.</param>
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/// <param name="optStart">Offset to the IMAGE_OPTIONAL_HEADER.</param>
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/// <param name="sectionTableOffset">Offset to the section table.</param>
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/// <param name="rnd">Random number generator (unused in this method).</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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// Directories that are considered safe and should not be modified (those with known important data).
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int[] safeDirs = { 4, 6, 11, 13, 14 };
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int baseOffset = optStart + 0x60;
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// Sanity check: Optional Header must contain enough data directories
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if (baseOffset + (16 * 8) > raw.Length)
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throw new Exception("Optional Header is too small or malformed. Cannot process Data Directories.");
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// Iterate through each Data Directory index to clear unused directories
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foreach (int i in safeDirs) {
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int off = baseOffset + i * 8;
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// Check if the RVA is 0, indicating an unused Data Directory entry, and clear it
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if (off + 8 <= raw.Length && BitConverter.ToUInt32(raw, off) == 0)
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Array.Clear(raw, off, 8);
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}
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}
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}
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}
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