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https://github.com/DosX-dev/Astral-PE
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DosX
77 lines
3.9 KiB
C#
77 lines
3.9 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 WinAuthSignStripper : IAstralPeModule {
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/// <summary>
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/// Applies the overlay stripper to remove the overlay from the PE file if it matches the signature.
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/// The signature we are looking for is "00 02 02 00" (which is a common pattern found in some overlays).
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/// If this pattern is found at the start of the overlay, the overlay is removed.
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/// </summary>
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/// <param name="raw">The raw byte array of the PE file.</param>
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/// <param name="pe">The parsed PE file, used to access the section headers and overlay information.</param>
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/// <param name="e_lfanew">The offset to the IMAGE_NT_HEADERS in the PE file.</param>
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/// <param name="optStart">The offset to the Optional Header in the PE file.</param>
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/// <param name="sectionTableOffset">The offset to the section table in the PE file.</param>
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/// <param name="rnd">A random number generator (currently unused in this module, but required by the interface).</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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// Validate section headers
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if (pe.ImageSectionHeaders == null)
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throw new InvalidPeImageException();
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// Calculate the offset to the overlay data (after the last section)
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uint overlayOffset = pe.ImageSectionHeaders.Max(s => s.PointerToRawData + s.SizeOfRawData);
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// Make sure overlayOffset is not beyond the file length
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if (overlayOffset >= raw.Length)
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return;
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// Calculate the length of the overlay and check if it's too short to contain the signature
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if (raw.Length - (int)overlayOffset < 8)
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return;
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// Bounds check before reading overlay signature
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if (overlayOffset + 8 > (uint)raw.Length)
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throw new ArgumentOutOfRangeException("Overlay offset exceeds file bounds.");
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// Check for specific PKI-like signature (used in signed overlays)
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if (raw[overlayOffset + 4] == 0x00 &&
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raw[overlayOffset + 5] == 0x02 &&
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raw[overlayOffset + 6] == 0x02 &&
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raw[overlayOffset + 7] == 0x00) {
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// Resize the original byte array to remove the overlay
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Array.Resize(ref raw, (int)overlayOffset);
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}
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}
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}
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}
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