mirror of
https://github.com/DosX-dev/Astral-PE
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DosX
81 lines
3.8 KiB
C#
81 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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using PeNet.Header.Pe;
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namespace AstralPE.Obfuscator.Modules {
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public class LoadConfigWiper : IAstralPeModule {
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/// <summary>
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/// Applies the logic to wipe the Load Config Directory if safe.
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/// </summary>
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/// <param name="raw">Raw byte buffer of the PE file.</param>
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/// <param name="pe">Parsed PE file structure from PeNet.</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 table.</param>
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/// <param name="rnd">Random 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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// Verify header structures are present
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if (pe.ImageNtHeaders == null || pe.ImageSectionHeaders == null)
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throw new InvalidPeImageException();
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// Locate Load Config Directory
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ImageDataDirectory? loadCfg = pe.ImageNtHeaders.OptionalHeader.DataDirectory[(int)DataDirectoryType.LoadConfig];
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if (loadCfg.VirtualAddress == 0 || loadCfg.Size == 0)
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return;
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// Translate RVA to raw file offset
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uint rva = loadCfg.VirtualAddress,
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offset = rva.RvaToOffset(pe.ImageSectionHeaders);
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if (offset == 0 || offset + loadCfg.Size > raw.Length)
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throw new Exception("Load Config Directory points outside of file bounds.");
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// Check GuardFlags to see if CFG is enabled
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if (loadCfg.Size >= 0x48) {
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uint guardFlags = BitConverter.ToUInt32(raw, (int)(offset + 0x40));
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if ((guardFlags & 0x100) != 0) // IMAGE_GUARD_CF
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throw new Exception("CFG (Control Flow Guard) is enabled. Skipping Load Config wipe.");
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}
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// Clear the Load Config Directory data
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Array.Clear(raw, (int)offset, (int)loadCfg.Size);
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// Clear the DataDirectory entry
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int dataDirOffset = optStart + 0x60 + ((int)DataDirectoryType.LoadConfig * 8);
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if (dataDirOffset + 8 > raw.Length)
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throw new IndexOutOfRangeException("DataDirectory offset is outside of file bounds.");
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Array.Clear(raw, dataDirOffset, 8);
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}
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}
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}
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