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Use UPX as a guinea pig for new exe handling

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This commit is contained in:
Matt Nadareski
2021-08-26 15:50:38 -07:00
parent 3b753c137b
commit 0ec6dfb287
1 changed files with 67 additions and 39 deletions
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106
BurnOutSharp/PackerType/UPX.cs
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@@ -1,53 +1,60 @@
using System.Collections.Generic;
using System.Linq;
using System.Text;
using BurnOutSharp.ExecutableType.Microsoft;
using BurnOutSharp.Matching;
using BurnOutSharp.Tools;
namespace BurnOutSharp.PackerType
{
public class UPX : IContentCheck
{
/// <inheritdoc/>
public List<ContentMatchSet> GetContentMatchSets()
{
return new List<ContentMatchSet>
{
// UPX!
new ContentMatchSet(new byte?[] { 0x55, 0x50, 0x58, 0x21 }, GetVersion, "UPX"),
// NOS
new ContentMatchSet(
new ContentMatch(new byte?[] { 0x4E, 0x4F, 0x53, 0x20 }, end: 2048),
GetVersion,
"UPX (NOS Variant)"),
new ContentMatchSet(
new List<byte?[]>
{
// UPX0
new byte?[] { 0x55, 0x50, 0x58, 0x30 },
// UPX1
new byte?[] { 0x55, 0x50, 0x58, 0x31 },
},
"UPX (Unknown Version)"
),
new ContentMatchSet(
new List<byte?[]>
{
// NOS0
new byte?[] { 0x4E, 0x4F, 0x53, 0x30 },
// NOS1
new byte?[] { 0x4E, 0x4F, 0x53, 0x31 },
},
"UPX (NOS Variant) (Unknown Version)"
),
};
}
public List<ContentMatchSet> GetContentMatchSets() => null;
/// <inheritdoc/>
public string CheckContents(string file, byte[] fileContent, bool includeDebug = false) => null;
public string CheckContents(string file, byte[] fileContent, bool includeDebug = false)
{
// Get the sections from the executable, if possible
PEExecutable pex = PEExecutable.Deserialize(fileContent, 0);
var sections = pex?.SectionHeaders;
if (sections == null)
return null;
// Standard UPX
int foundPosition = FindData(fileContent, sections, "UPX");
if (foundPosition > -1)
{
var matchers = new List<ContentMatchSet>
{
// UPX!
new ContentMatchSet(
new ContentMatch(new byte?[] { 0x55, 0x50, 0x58, 0x21 }, end: foundPosition),
GetVersion,
"UPX"),
};
return MatchUtil.GetFirstMatch(file, fileContent, matchers, includeDebug);
}
// NOS Variant
foundPosition = FindData(fileContent, sections, "NOS");
if (foundPosition > -1)
{
var matchers = new List<ContentMatchSet>
{
// NOS
new ContentMatchSet(
new ContentMatch(new byte?[] { 0x4E, 0x4F, 0x53, 0x20 }, end: foundPosition),
GetVersion,
"UPX (NOS Variant)"),
};
return MatchUtil.GetFirstMatch(file, fileContent, matchers, includeDebug);
}
return null;
}
public static string GetVersion(string file, byte[] fileContent, List<int> positions)
{
@@ -66,5 +73,26 @@ namespace BurnOutSharp.PackerType
return "(Unknown Version)";
}
}
/// <summary>
/// Find the location of the first matched section, if possible
/// </summary>
/// <param name="fileContent">Byte array representing the file contents</param>
/// <param name="sections">Array of sections to check against</param>
/// <param name="sectionPrefix">Prefix of the sections to check for</param>
/// <returns>Real address of the section data, -1 on error</returns>
private int FindData(byte[] fileContent, IMAGE_SECTION_HEADER[] sections, string sectionPrefix)
{
// Get the two matching sections, if possible
var firstSection = sections.FirstOrDefault(s => Encoding.ASCII.GetString(s.Name).StartsWith($"{sectionPrefix}0"));
var secondSection = sections.FirstOrDefault(s => Encoding.ASCII.GetString(s.Name).StartsWith($"{sectionPrefix}1"));
// If either section is null, we can't do anything
if (firstSection == null || secondSection == null)
return -1;
// Return the first section address
return (int)EVORE.ConvertVirtualAddress(firstSection.VirtualAddress, sections);
}
}
}