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Improve MS-CAB SFX matching

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This commit is contained in:
Matt Nadareski
2021-08-30 12:08:17 -07:00
parent 64de357257
commit ffcaf4d16b
1 changed files with 87 additions and 38 deletions
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125
BurnOutSharp/PackerType/MicrosoftCABSFX.cs
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@@ -2,6 +2,9 @@ using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using BurnOutSharp.ExecutableType.Microsoft;
using BurnOutSharp.Matching;
using BurnOutSharp.Tools;
@@ -14,48 +17,11 @@ namespace BurnOutSharp.PackerType
public bool ShouldScan(byte[] magic) => true;
/// <inheritdoc/>
public List<ContentMatchSet> GetContentMatchSets()
{
return new List<ContentMatchSet>
{
// wextract_cleanup
new ContentMatchSet(new byte?[]
{
0x77, 0x65, 0x78, 0x74, 0x72, 0x61, 0x63, 0x74,
0x5F, 0x63, 0x6C, 0x65, 0x61, 0x6E, 0x75, 0x70,
}, GetVersion, "Microsoft CAB SFX"),
// W + (char)0x00 + e + (char)0x00 + x + (char)0x00 + t + (char)0x00 + r + (char)0x00 + a + (char)0x00 + c + (char)0x00 + t + (char)0x00
new ContentMatchSet(new byte?[]
{
0x57, 0x00, 0x65, 0x00, 0x78, 0x00, 0x74, 0x00,
0x72, 0x00, 0x61, 0x00, 0x63, 0x00, 0x74, 0x00,
}, GetVersion, "Microsoft CAB SFX"),
// W + (char)0x00 + E + (char)0x00 + X + (char)0x00 + T + (char)0x00 + R + (char)0x00 + A + (char)0x00 + C + (char)0x00 + T + (char)0x00 + . + (char)0x00 + E + (char)0x00 + X + (char)0x00 + E + (char)0x00
new ContentMatchSet(new byte?[]
{
0x57, 0x00, 0x45, 0x00, 0x58, 0x00, 0x54, 0x00,
0x52, 0x00, 0x41, 0x00, 0x43, 0x00, 0x54, 0x00,
0x2E, 0x00, 0x45, 0x00, 0x58, 0x00, 0x45, 0x00,
}, GetVersion, "Microsoft CAB SFX"),
/* This detects a different but similar type of SFX that uses Microsoft CAB files.
Further research is needed to see if it's just a different version or entirely separate. */
// MSCFu
new ContentMatchSet(new byte?[] { 0x4D, 0x53, 0x43, 0x46, 0x75 }, GetVersion, "Microsoft CAB SFX"),
};
}
public List<ContentMatchSet> GetContentMatchSets() => null;
/// <inheritdoc/>
public string CheckContents(string file, byte[] fileContent, bool includeDebug = false)
{
// Get the sections from the executable, if possible
// PortableExecutable pex = PortableExecutable.Deserialize(fileContent, 0);
// var sections = pex?.SectionTable;
// if (sections == null)
// return null;
// TODO: Implement resource finding instead of using the built in methods
// Assembly information lives in the .rsrc section
// I need to find out how to navigate the resources in general
@@ -85,6 +51,89 @@ namespace BurnOutSharp.PackerType
return "Microsoft CAB SFX";
}
// Get the sections from the executable, if possible
PortableExecutable pex = PortableExecutable.Deserialize(fileContent, 0);
var sections = pex?.SectionTable;
if (sections == null)
return null;
// Get the .data section, if it exists
var dataSection = sections.FirstOrDefault(s => Encoding.ASCII.GetString(s.Name).StartsWith(".data"));
if (dataSection != null)
{
int sectionAddr = (int)dataSection.PointerToRawData;
int sectionEnd = sectionAddr + (int)dataSection.VirtualSize;
var matchers = new List<ContentMatchSet>
{
// wextract_cleanup
new ContentMatchSet(
new ContentMatch(new byte?[]
{
0x77, 0x65, 0x78, 0x74, 0x72, 0x61, 0x63, 0x74,
0x5F, 0x63, 0x6C, 0x65, 0x61, 0x6E, 0x75, 0x70,
}, start: sectionAddr, end: sectionEnd),
GetVersion, "Microsoft CAB SFX"),
};
string match = MatchUtil.GetFirstMatch(file, fileContent, matchers, includeDebug);
if (!string.IsNullOrWhiteSpace(match))
return match;
}
// Get the .rsrc section, if it exists
var rsrcSection = sections.FirstOrDefault(s => Encoding.ASCII.GetString(s.Name).StartsWith(".rsrc"));
if (rsrcSection != null)
{
int sectionAddr = (int)rsrcSection.PointerToRawData;
int sectionEnd = sectionAddr + (int)rsrcSection.VirtualSize;
var matchers = new List<ContentMatchSet>
{
// W + (char)0x00 + e + (char)0x00 + x + (char)0x00 + t + (char)0x00 + r + (char)0x00 + a + (char)0x00 + c + (char)0x00 + t + (char)0x00
new ContentMatchSet(
new ContentMatch(new byte?[]
{
0x57, 0x00, 0x65, 0x00, 0x78, 0x00, 0x74, 0x00,
0x72, 0x00, 0x61, 0x00, 0x63, 0x00, 0x74, 0x00,
}, start: sectionAddr, end: sectionEnd),
GetVersion, "Microsoft CAB SFX"),
// W + (char)0x00 + E + (char)0x00 + X + (char)0x00 + T + (char)0x00 + R + (char)0x00 + A + (char)0x00 + C + (char)0x00 + T + (char)0x00 + . + (char)0x00 + E + (char)0x00 + X + (char)0x00 + E + (char)0x00
new ContentMatchSet(
new ContentMatch(new byte?[]
{
0x57, 0x00, 0x45, 0x00, 0x58, 0x00, 0x54, 0x00,
0x52, 0x00, 0x41, 0x00, 0x43, 0x00, 0x54, 0x00,
0x2E, 0x00, 0x45, 0x00, 0x58, 0x00, 0x45, 0x00,
}, start: sectionAddr, end: sectionEnd),
GetVersion, "Microsoft CAB SFX"),
};
string match = MatchUtil.GetFirstMatch(file, fileContent, matchers, includeDebug);
if (!string.IsNullOrWhiteSpace(match))
return match;
}
// Get the .text section, if it exists
var textSection = sections.FirstOrDefault(s => Encoding.ASCII.GetString(s.Name).StartsWith(".text"));
if (textSection != null)
{
int sectionAddr = (int)textSection.PointerToRawData;
int sectionEnd = sectionAddr + (int)textSection.VirtualSize;
var matchers = new List<ContentMatchSet>
{
/* This detects a different but similar type of SFX that uses Microsoft CAB files.
Further research is needed to see if it's just a different version or entirely separate. */
// MSCFu
new ContentMatchSet(
new ContentMatch(new byte?[] { 0x4D, 0x53, 0x43, 0x46, 0x75 }, start: sectionAddr, end: sectionEnd),
GetVersion, "Microsoft CAB SFX"),
};
string match = MatchUtil.GetFirstMatch(file, fileContent, matchers, includeDebug);
if (!string.IsNullOrWhiteSpace(match))
return match;
}
return null;
}