public WorkbookStream(string filePath)
{
using (var fs = new FileStream(filePath, FileMode.Open))
{
StructuredStorageReader ssr = new StructuredStorageReader(fs);
try
{
var wbStream = ssr.GetStream("Workbook");
byte[] wbBytes = new byte[wbStream.Length];
wbStream.Read(wbBytes, 0, wbBytes.Length, 0);
_biffRecords = RecordHelper.ParseBiffStreamBytes(wbBytes);
}
catch (StreamNotFoundException)
{
var wbStream = ssr.GetStream("Book");
Console.WriteLine("WARNING: Main stream is in a Book record indicating legacy Excel 5 BIFF format. This may not parse correctly.");
byte[] wbBytes = new byte[wbStream.Length];
wbStream.Read(wbBytes, 0, wbBytes.Length, 0);
try
{
_biffRecords = RecordHelper.ParseBiffStreamBytes(wbBytes);
}
catch (Exception)
{
throw new NotImplementedException("Error parsing Book stream: Macrome currently doesn't support the Excel 5 BIFF format.");
}
}
}
}
public static string GetRelevantRecordDumpString(WorkbookStream wbs, bool dumpHexBytes = false, bool showAttrInfo = false)
{
int numBytesToDump = 0;
if (dumpHexBytes)
{
numBytesToDump = 0x1000;
}
List <BiffRecord> relevantRecords = wbs.Records.Where(rec => RecordHelper.RelevantTypes.Contains(rec.Id)).ToList();
relevantRecords = RecordHelper.ConvertToSpecificRecords(relevantRecords);
relevantRecords = PtgHelper.UpdateGlobalsStreamReferences(relevantRecords);
string dumpString = "";
foreach (var record in relevantRecords)
{
dumpString += record.ToHexDumpString(numBytesToDump, showAttrInfo);
dumpString += "\n";
}
return(dumpString);
}
public static string GetRelevantRecordDumpString(WorkbookStream wbs, bool dumpHexBytes = false, bool showAttrInfo = false)
{
int numBytesToDump = 0;
if (dumpHexBytes)
{
numBytesToDump = 0x1000;
}
bool hasPassword = wbs.HasPasswordToOpen();
List <BiffRecord> relevantRecords = wbs.Records.Where(rec => RecordHelper.RelevantTypes.Contains(rec.Id)).ToList();
//We can only interpret the data of these records if they are not encrypted
if (!hasPassword)
{
relevantRecords = RecordHelper.ConvertToSpecificRecords(relevantRecords);
relevantRecords = PtgHelper.UpdateGlobalsStreamReferences(relevantRecords);
}
string dumpString = "";
foreach (var record in relevantRecords)
{
dumpString += record.ToHexDumpString(numBytesToDump, showAttrInfo);
dumpString += "\n";
}
return(dumpString);
}
public WorkbookStream(string filePath)
{
using (var fs = new FileStream(filePath, FileMode.Open))
{
StructuredStorageReader ssr = new StructuredStorageReader(fs);
var wbStream = ssr.GetStream("Workbook");
byte[] wbBytes = new byte[wbStream.Length];
wbStream.Read(wbBytes, 0, wbBytes.Length, 0);
_biffRecords = RecordHelper.ParseBiffStreamBytes(wbBytes);
}
}
/// <summary>
/// Dumps information about BIFF records that are relevant for analysis. Defaults to sheet, label, and formula data.
/// </summary>
/// <param name="path">Path to the XLS file to dump</param>
/// <param name="dumpAll">Dump all BIFF records, not the most commonly used by maldocs</param>
/// <param name="showAttrInfo">Explicitly display PtgAttr information in Formula strings. Defaults to False.</param>
/// <param name="dumpHexBytes">Dump the byte content of each BIFF record in addition to its content summary. Defaults to False.</param>
public static void Dump(FileInfo path, bool dumpAll = false, bool showAttrInfo = false, bool dumpHexBytes = false)
{
if (path == null)
{
Console.WriteLine("path argument must be specified in Dump mode. Run dump -h for usage instructions.");
return;
}
if (path.Exists == false)
{
Console.WriteLine("path file does not exist.");
return;
}
WorkbookStream wbs = new WorkbookStream(path.FullName);
List <RecordType> relevantTypes = new List <RecordType>()
{
RecordType.BoundSheet8, //Sheet definitions (Defines macro sheets + hides them)
RecordType.Lbl, //Named Cells (Contains Auto_Start)
RecordType.Formula, //The meat of most cell content
RecordType.SupBook, //Contains information for cross-sheet references
RecordType.ExternSheet //Contains the XTI records mapping ixti values to BoundSheet8
};
int numBytesToDump = 0;
if (dumpHexBytes)
{
numBytesToDump = 0x1000;
}
if (dumpAll)
{
WorkbookStream fullStream = new WorkbookStream(PtgHelper.UpdateGlobalsStreamReferences(wbs.Records));
foreach (var record in fullStream.Records)
{
Console.WriteLine(record.ToHexDumpString(numBytesToDump, showAttrInfo));
}
}
else
{
List <BiffRecord> relevantRecords = wbs.Records.Where(rec => relevantTypes.Contains(rec.Id)).ToList();
relevantRecords = RecordHelper.ConvertToSpecificRecords(relevantRecords);
relevantRecords = PtgHelper.UpdateGlobalsStreamReferences(relevantRecords);
foreach (var record in relevantRecords)
{
string dumpString = "";
dumpString += record.ToHexDumpString(numBytesToDump, showAttrInfo);
Console.WriteLine(dumpString);
}
}
}
/// <summary>
/// Dumps information about BIFF records that are relevant for analysis. Defaults to sheet, label, and formula data.
/// </summary>
/// <param name="path">Path to the XLS file to dump</param>
/// <param name="dumpAll">Dump all BIFF records, not the most commonly used by maldocs</param>
/// <param name="showAttrInfo">Explicitly display PtgAttr information in Formula strings. Defaults to False.</param>
/// <param name="dumpHexBytes">Dump the byte content of each BIFF record in addition to its content summary.</param>
/// <param name="password">XOR Obfuscation decryption password to try. Defaults to VelvetSweatshop if FilePass record is found.</param>
/// <param name="disableDecryption">Use this flag in order to skip decryption of the file before dumping.</param>
public static void Dump(FileInfo path, bool dumpAll = false, bool showAttrInfo = false, bool dumpHexBytes = false, string password = "******", bool disableDecryption = false)
{
if (path == null)
{
Console.WriteLine("path argument must be specified in Dump mode. Run dump -h for usage instructions.");
return;
}
if (path.Exists == false)
{
Console.WriteLine("path file does not exist.");
return;
}
WorkbookStream wbs = new WorkbookStream(path.FullName);
if (wbs.HasPasswordToOpen() && !disableDecryption)
{
Console.WriteLine("FilePass record found - attempting to decrypt with password " + password);
XorObfuscation xorObfuscation = new XorObfuscation();
try
{
wbs = xorObfuscation.DecryptWorkbookStream(wbs, password);
}
catch (ArgumentException argEx)
{
Console.WriteLine("Password " + password + " does not match the verifier value of the document FilePass. Try a different password.");
return;
}
}
int numBytesToDump = 0;
if (dumpHexBytes)
{
numBytesToDump = 0x1000;
}
if (dumpAll)
{
List <BiffRecord> records;
WorkbookStream fullStream = new WorkbookStream(PtgHelper.UpdateGlobalsStreamReferences(wbs.Records));
records = fullStream.Records;
foreach (var record in records)
{
Console.WriteLine(record.ToHexDumpString(numBytesToDump, showAttrInfo));
}
}
else
{
string dumpString = RecordHelper.GetRelevantRecordDumpString(wbs, dumpHexBytes, showAttrInfo);
Console.WriteLine(dumpString);
}
}
public WorkbookStream AddSheet(BoundSheet8 sheetHeader, byte[] sheetBytes)
{
WorkbookStream newStream = new WorkbookStream(Records);
List <BoundSheet8> existingBoundSheets = newStream.GetAllRecordsByType <BoundSheet8>();
BoundSheet8 lastSheet8 = existingBoundSheets.Last();
newStream = newStream.InsertRecord(sheetHeader, lastSheet8);
List <BiffRecord> sheetRecords = RecordHelper.ParseBiffStreamBytes(sheetBytes);
newStream = newStream.InsertRecords(sheetRecords);
newStream = newStream.FixBoundSheetOffsets();
return(newStream);
}
/// <summary>
/// Dumps information about BIFF records that are relevant for analysis. Defaults to sheet, label, and formula data.
/// </summary>
/// <param name="path">Path to the XLS file to dump</param>
/// <param name="dumpAll">Dump all BIFF records, not the most commonly used by maldocs</param>
/// <param name="showAttrInfo">Explicitly display PtgAttr information in Formula strings. Defaults to False.</param>
/// <param name="dumpHexBytes">Dump the byte content of each BIFF record in addition to its content summary. Defaults to False.</param>
public static void Dump(FileInfo path, bool dumpAll = false, bool showAttrInfo = false, bool dumpHexBytes = false)
{
if (path == null)
{
Console.WriteLine("path argument must be specified in Dump mode. Run dump -h for usage instructions.");
return;
}
if (path.Exists == false)
{
Console.WriteLine("path file does not exist.");
return;
}
WorkbookStream wbs = new WorkbookStream(path.FullName);
int numBytesToDump = 0;
if (dumpHexBytes)
{
numBytesToDump = 0x1000;
}
if (dumpAll)
{
WorkbookStream fullStream = new WorkbookStream(PtgHelper.UpdateGlobalsStreamReferences(wbs.Records));
foreach (var record in fullStream.Records)
{
Console.WriteLine(record.ToHexDumpString(numBytesToDump, showAttrInfo));
}
}
else
{
string dumpString = RecordHelper.GetRelevantRecordDumpString(wbs, dumpHexBytes, showAttrInfo);
Console.WriteLine(dumpString);
}
}
public WorkbookStream(byte[] workbookBytes)
{
_biffRecords = RecordHelper.ParseBiffStreamBytes(workbookBytes);
}
public byte[] ToBytes()
{
return(RecordHelper.ConvertBiffRecordsToBytes(_biffRecords));
}
public WorkbookStream AddSheet(BoundSheet8 sheetHeader, List <BiffRecord> records)
{
return(AddSheet(sheetHeader, RecordHelper.ConvertBiffRecordsToBytes(records)));
}
/// <summary>
/// Dumps information about BIFF records that are relevant for analysis. Defaults to sheet, label, and formula data.
/// </summary>
/// <param name="path">Path to the XLS file to dump</param>
/// <param name="dumpAll">Dump all BIFF records, not the most commonly used by maldocs</param>
/// <param name="showAttrInfo">Explicitly display PtgAttr information in Formula strings. Defaults to False.</param>
/// <param name="dumpHexBytes">Dump the byte content of each BIFF record in addition to its content summary.</param>
/// <param name="password">XOR Obfuscation decryption password to try. Defaults to VelvetSweatshop if FilePass record is found.</param>
/// <param name="disableDecryption">Use this flag in order to skip decryption of the file before dumping.</param>
public static void Dump(FileInfo path, bool dumpAll = false, bool showAttrInfo = false, bool dumpHexBytes = false, string password = "******", bool disableDecryption = false)
{
if (path == null)
{
Console.WriteLine("path argument must be specified in Dump mode. Run dump -h for usage instructions.");
return;
}
if (path.Exists == false)
{
Console.WriteLine("path file does not exist.");
return;
}
WorkbookStream wbs = new WorkbookStream(path.FullName);
if (wbs.HasPasswordToOpen() && !disableDecryption)
{
FilePass fpRecord = wbs.GetAllRecordsByType <FilePass>().First();
if (fpRecord.wEncryptionType == 0 && fpRecord.xorObfuscationKey != 0)
{
XorObfuscation xorObfuscation = new XorObfuscation();
Console.WriteLine("FilePass record found - attempting to decrypt with password " + password);
try
{
wbs = xorObfuscation.DecryptWorkbookStream(wbs, password);
}
catch (ArgumentException argEx)
{
Console.WriteLine("Password " + password + " does not match the verifier value of the document FilePass. Try a different password.");
return;
}
}
else if (fpRecord.wEncryptionType == 1 && fpRecord.vMajor > 1)
{
Console.WriteLine("FilePass record for CryptoAPI Found - Currently Unsupported.");
string verifierSalt = BitConverter.ToString(fpRecord.encryptionVerifier.Salt).Replace("-", "");
string verifier = BitConverter.ToString(fpRecord.encryptionVerifier.EncryptedVerifier).Replace("-", "");
string verifierHash = BitConverter.ToString(fpRecord.encryptionVerifier.EncryptedVerifierHash).Replace("-", "");
Console.WriteLine("Salt is: " + verifierSalt);
Console.WriteLine("Vrfy is: " + verifier);
Console.WriteLine("vHsh is: " + verifierHash);
Console.WriteLine("Algo is: " + string.Format("{0:x8}", fpRecord.encryptionHeader.AlgID));
}
else if (fpRecord.wEncryptionType == 1 && fpRecord.vMajor == 1)
{
Console.WriteLine("FilePass record for RC4 Binary Document Encryption Found - Currently Unsupported.");
}
}
int numBytesToDump = 0;
if (dumpHexBytes)
{
numBytesToDump = 0x1000;
}
if (dumpAll)
{
List <BiffRecord> records;
WorkbookStream fullStream = new WorkbookStream(PtgHelper.UpdateGlobalsStreamReferences(wbs.Records));
records = fullStream.Records;
foreach (var record in records)
{
Console.WriteLine(record.ToHexDumpString(numBytesToDump, showAttrInfo));
}
}
else
{
string dumpString = RecordHelper.GetRelevantRecordDumpString(wbs, dumpHexBytes, showAttrInfo);
Console.WriteLine(dumpString);
}
}
