mirror of
https://github.com/DosX-dev/Astral-PE
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DosX
92 lines
3.9 KiB
C#
92 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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using PeNet.Header.Pe;
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namespace AstralPE.Obfuscator.Modules {
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public class LegacyVbCompilerMutator : IAstralPeModule {
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/// <summary>
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/// Detects legacy VB compiler metadata and removes embedded VB project path.
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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 structure.</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 start.</param>
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/// <param name="rnd">Random instance (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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// Ensure section headers are present
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if (pe.ImportedFunctions == null || pe.ImageSectionHeaders == null || pe.ImportedFunctions.Length == 0)
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return;
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// Check for any import from VB5/6 runtimes
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bool isVB = pe.ImportedFunctions.Any(f =>
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f.DLL?.ToLowerInvariant().Contains("vbvm5") == true ||
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f.DLL?.ToLowerInvariant().Contains("vbvm6") == true);
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if (!isVB)
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return;
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ReadOnlySpan<byte> marker = "VB6.OLB"u8;
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for (int s = 0; s < pe.ImageSectionHeaders.Length; s++) {
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ImageSectionHeader section = pe.ImageSectionHeaders[s];
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int startOffset = (int)section.PointerToRawData;
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int size = (int)section.SizeOfRawData;
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if (startOffset == 0 || size == 0 || startOffset + size > raw.Length)
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continue;
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ReadOnlySpan<byte> span = raw.AsSpan(startOffset, size);
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int pos = span.IndexOf(marker);
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while (pos != -1) {
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int strStart = startOffset + pos;
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while (strStart > startOffset && raw[strStart - 1] != 0)
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strStart--;
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int strEnd = startOffset + pos + marker.Length;
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while (strEnd < startOffset + size && raw[strEnd] != 0)
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strEnd++;
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for (int i = strStart; i < strEnd; i++)
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raw[i] = 0x00;
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pos = span.Slice(strEnd - startOffset).IndexOf(marker);
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if (pos != -1)
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pos += strEnd - startOffset;
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}
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}
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}
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}
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}
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