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NETBIOS.cs
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NETBIOS.cs
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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
namespace Reecon
{
class NETBIOS // TCP 139
{
public static (string, string) GetInfo(string target, int port)
{
string toReturn = "";
// Console.WriteLine("Running: GetNBStatInfo");
toReturn += GetNBStatInfo(target); // Uses UDP Port 137
// Console.WriteLine("Running: GetDNSHostEntry");
toReturn += GetDNSHostEntry(target);
// https://www.samba.org/samba/docs/current/man-html/rpcclient.1.html
// The standard (well-known) TCP port number for an SMB/CIFS server is 139, which is the default.
// Console.WriteLine("Running: GetRPCInfo");
toReturn += GetRPCInfo(target);
toReturn += $"- nmap -sC -sV may have some additional information for port {port}";
return ("NETBIOS", toReturn);
}
public static string GetNBStatInfo(string ip)
{
// This code is messy as heck and needs to be cleaned
// MAC was here, but got nuked
string toReturn = "";
byte[] bs = new byte[] { 0x0, 0x00, 0x0, 0x10, 0x0, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x20, 0x43, 0x4b, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x0, 0x0, 0x21, 0x0, 0x1 };
byte[] Buf = new byte[500];
string str = "", strHost = "", Host = "", Group = "", User = "", strHex = "";
int receive;
try
{
IPEndPoint senderTest = new(IPAddress.Any, 137);
EndPoint Remote = (EndPoint)senderTest;
IPEndPoint ipep = new(IPAddress.Parse(ip), 137);
Socket server = new(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
// server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout,);
server.SendTo(bs, bs.Length, SocketFlags.None, ipep);
server.ReceiveTimeout = 5000;
receive = server.ReceiveFrom(Buf, ref Remote);
server.Close();
string buffStr = ASCIIEncoding.ASCII.GetString(Buf);
int tem = 0, num = 0;
bool bAdd = true;
for (int i = 57; i < 500; i++) //57-72
{
//end
if (Buf[i] == 0xcc)
break;
if (Buf[i] == 0x20)
bAdd = false;
if (bAdd)
{
str = ((char)Buf[i]).ToString();
if (Buf[i] >= ' ') strHost += str;
str = ((char)Buf[i]).ToString();
strHex += str;
}
if ((++tem) % 18 == 0)
{
bAdd = true;
if (strHost == "")
{
num++;
break;
}
if (num == 0 && strHost != "")
{
Host = strHost;
toReturn += "- NETBIOS Name: " + Host + Environment.NewLine;
num++;
}
else
{
if (Host != strHost && num == 1 && strHost != "")
{
Group = strHost;
// This character is invisible and completely breaks layouts on Linux - And I have no idea why
Group = Group.Replace(Convert.ToChar(132).ToString(), "");
toReturn += "- Group: " + Group + Environment.NewLine;
num++;
}
else
{
if (strHost != Host && strHost != Group && num == 2 && strHost != "")
{
User = strHost;
if (User != "__MSBROWSE__")
{
toReturn += "- User: " + User + Environment.NewLine;
num++;
}
}
}
}
strHost = "";
strHex = "";
}
}
}
catch (SocketException ex)
{
// Windows // Mono
if (!ex.Message.StartsWith("A connection attempt failed because the connected party did not properly respond after a period of time") && ex.Message != "Connection timed out")
//Console.WriteLine(ex.Message);
{
return "Error: " + ex.Message;
}
}
return toReturn;
}
private static string GetDNSHostEntry(string ip)
{
string dnsInfo = "";
// TODO: https://dzone.com/articles/practical-fun-with-netbios-name-service-and-comput
try
{
IPHostEntry entry = Dns.GetHostEntry(ip);
if (entry != null)
{
if (!string.IsNullOrEmpty(entry.HostName))
{
dnsInfo = "- HostName: " + entry.HostName + Environment.NewLine;
}
else
{
dnsInfo = "- Unknown Path GetDNSHostEntry.emptyHostName - Bug Reelix";
}
}
else
{
dnsInfo = "- Unknown Path GetDNSHostEntry.nullEntry - Bug Reelix";
}
}
catch (Exception ex)
{
if (ex.Message != "Name or service not known")
{
dnsInfo += "- Unable to get DNS Host Entry: " + ex.Message + Environment.NewLine;
}
}
return dnsInfo;
}
private static string GetRPCInfo(string ip)
{
// Beware!
string rpcInfo = "";
bool anonAccess = false;
bool signing = true;
if (General.GetOS() == General.OS.Linux)
{
if (General.IsInstalledOnLinux("rpcclient", "/usr/bin/rpcclient"))
{
// Find the Domain Name
// Console.WriteLine("RPC - lsaquery");
List<string> domainNameList = RPCClient.GetLsaqueryOutput(ip);
domainNameList.RemoveAll(x => !x.StartsWith("Domain Name:"));
if (domainNameList.Count == 1)
{
anonAccess = true;
rpcInfo += "- " + domainNameList[0] + Environment.NewLine;
}
// Server info
// Console.WriteLine("RPC - srvinfo");
List<string> srvinfoList = RPCClient.GetSrvinfoOutput(ip);
bool setNoSigning = false;
// If it's denied the first time - Try the no-signing backup
if (srvinfoList.Count != 0 && srvinfoList[0].Contains("NT_STATUS_ACCESS_DENIED"))
{
// noSigning backup!
// Console.WriteLine("RPC - srvinfo - noSigning Backup");
srvinfoList = RPCClient.GetSrvinfoOutput(ip, false);
setNoSigning = true;
}
if (srvinfoList.Count != 0 && !srvinfoList.Any(x => x.Contains("NT_STATUS_ACCESS_DENIED")) && !srvinfoList[0].Contains("NT_STATUS_LOGON_FAILURE"))
{
// If it only worked with the no-signing backup - Yay!
if (setNoSigning)
{
Console.WriteLine("Sneaky access found with RPC - This might take a bit longer than planned (Up to 3 minutes)");
signing = false;
}
anonAccess = true;
/*
MOTUNUI Wk Sv PrQ Unx NT SNT motunui server (Samba, Ubuntu)
platform_id : 500
os version : 6.1
server type : 0x809a03
*/
rpcInfo += "- srvinfo: " + srvinfoList[0] + Environment.NewLine;
// https://en.wikipedia.org/wiki/List_of_Microsoft_Windows_versions
if (srvinfoList.Count == 4)
{
if (srvinfoList[2].Trim().StartsWith("os version"))
{
string osVersion = srvinfoList[2];
osVersion = osVersion.Split(':')[1];
osVersion = osVersion.Trim();
if (osVersion == "6.1")
{
rpcInfo += "- srvinfo (OS): Windows 7 OR Windows Server 2008 (One of the two)" + Environment.NewLine;
}
else if (osVersion == "6.2")
{
rpcInfo += "- srvinfo (OS): Windows 8 OR Windows Server 2012 (One of the two)" + Environment.NewLine;
}
else if (osVersion == "10.0")
{
rpcInfo += "- srvinfo (OS): Windows 10 OR Windows Server 2016 OR Windows Server 2019 (10.0 is very vague)" + Environment.NewLine;
}
else
{
rpcInfo += "- srvinfo (OS): Unknown - ID: " + osVersion + " - Bug Reelix!" + Environment.NewLine;
}
}
else
{
rpcInfo += "- Weird srvinfo return - Bug Reelix!";
}
}
}
// Console.WriteLine("RPC - enumdomusers");
List<string> enumdomusersList = RPCClient.GetEnumdomusersOutput(ip, signing);
if (enumdomusersList.Count == 0 // Allowed - But no results
|| enumdomusersList.Count == 1 && enumdomusersList[0].Contains("NT_STATUS_ACCESS_DENIED"))
{
// Find public SIDs with lsaenumsid
// Console.WriteLine("RPC - lsaenumid");
List<string> sidList = RPCClient.GetLsaenumsidOutput(ip, signing);
if (sidList.Count != 0 && !sidList[0].Contains("NT_STATUS_ACCESS_DENIED"))
{
anonAccess = true;
rpcInfo += "- Found SIDs" + Environment.NewLine;
List<string> sidResolution = RPCClient.GetLookupsidsOutput(ip, sidList, signing);
if (sidResolution.Count != 0)
{
foreach (string result in sidResolution)
{
rpcInfo += "-- " + result + Environment.NewLine;
}
}
}
// Find sneaky SIDs
// Console.WriteLine("RPC - lookupnames");
List<string> sneakyNameLookup = RPCClient.GetLookupnamesOutput(ip, "administrator guest krbtgt root bin none", signing);
sneakyNameLookup.RemoveAll(x => !x.Contains("(User: "));
if (sneakyNameLookup.Count != 0)
{
anonAccess = true;
List<string> sneakySIDBaseList = new();
foreach (string name in sneakyNameLookup)
{
string sneakySID = name.Split(' ')[1];
if (!sidList.Contains(sneakySID))
{
// Just add the base - We lookup later
string sneakySIDBase = sneakySID.Substring(0, sneakySID.LastIndexOf("-") + 1);
if (!sneakySIDBaseList.Contains(sneakySIDBase))
{
sneakySIDBaseList.Add(sneakySIDBase);
}
}
}
// Needs the base SID to enumerate
if (sneakySIDBaseList.Count != 0)
{
List<string> sneakySIDList = new();
foreach (string sneakyBase in sneakySIDBaseList)
{
// Low ones are just system names - Can ignore them - Proper ones start from 1000
for (int j = 1000; j <= 1015; j++)
{
sneakySIDList.Add(sneakyBase + j);
}
// Some sneakier ones hiding from 1100 instead
for (int j = 1100; j <= 1115; j++)
{
sneakySIDList.Add(sneakyBase + j);
}
List<string> sneakySIDLookup = RPCClient.GetLookupsidsOutput(ip, sneakySIDList, signing);
if (sneakySIDLookup.Count != 0)
{
// Remove non-users
sneakySIDLookup.RemoveAll(x => !x.Trim().EndsWith("(1)"));
foreach (string lookupResult in sneakySIDLookup)
{
string name = lookupResult.Substring(0, lookupResult.LastIndexOf(" (1)"));
name = name.Remove(0, name.LastIndexOf("\\") + 1);
// Some invalid ones simply have the number itself instead of the name
// A bit hacky, but it works
if (!int.TryParse(name, out int toIgnore))
{
rpcInfo += "-- " + $"Sneaky Username Found: {name}".Recolor(Color.Orange) + Environment.NewLine;
}
}
}
}
}
}
}
else // Count > 0
{
string firstItem = enumdomusersList[0];
if (firstItem.Contains("user:") && firstItem.Contains("rid:"))
{
// All is fine
if (enumdomusersList.Count >= 3)
{
Console.WriteLine("Found a lot of useful RPC info - Output may take a few seconds longer than expected");
}
rpcInfo += "- User Listing" + Environment.NewLine;
List<string> usernames = new List<string>();
foreach (string user in enumdomusersList)
{
// user:[fox] rid:[0x3e8]
string username = user.Remove(0, user.IndexOf("[") + 1);
username = username.Substring(0, username.IndexOf("]"));
usernames.Add(username);
rpcInfo += RPCClient.GetQueryuserInfo(ip, username);
}
// See if there are any we're missing
// Get the default names list
var defaultNames = RPCClient.LookupNames(ip, "administrator guest krbtgt root bin none", signing);
// Filter them to only get the users
defaultNames = defaultNames.Where(x => x.Type.Contains("User")).ToList();
// Get the users SIDs
List<string> defaultNameSids = defaultNames.Select(x => x.SID).ToList();
// Sneaky sid lookup by the sids
var sneakySids = RPCClient.GetSneakySids(ip, defaultNameSids, signing);
// Remove the names we already have
sneakySids.RemoveAll(x => usernames.Contains(x.Name));
// Rest are missed!
foreach (var item in sneakySids)
{
rpcInfo += "-- " + $"Sneaky Username Found: {item.Name}".Recolor(Color.Orange) + Environment.NewLine;
}
// 23 -> https://room362.com/post/2017/reset-ad-user-password-with-linux/
rpcInfo += "--> rpcclient -> setuserinfo2 userNameHere 23 'newPasswordHere'" + Environment.NewLine;
}
else if (firstItem == "Cannot connect to server. Error was NT_STATUS_RESOURCE_NAME_NOT_FOUND")
{
rpcInfo = "- Cannot connect - Are you sure it's up?" + Environment.NewLine;
}
else if (firstItem == "Cannot connect to server. Error was NT_STATUS_IO_TIMEOUT")
{
rpcInfo = "- Cannot connect - It timed out :<" + Environment.NewLine;
}
else if (firstItem == "Cannot connect to server. Error was NT_STATUS_CONNECTION_DISCONNECTED")
{
rpcInfo = "- Cannot connect - It kicks you out instantly" + Environment.NewLine;
}
else if (firstItem.Contains("was NT_STATUS_ACCESS_DENIED"))
{
rpcInfo = "- enumdomusers is denied - Probably can't get anything useful" + Environment.NewLine;
}
else if (firstItem.Contains("was NT_STATUS_LOGON_FAILURE"))
{
rpcInfo = "- Unable to log on at all - Possibly a timeout :(" + Environment.NewLine;
}
else
{
foreach (string item in enumdomusersList)
{
Console.WriteLine("Debug Info item: " + item);
}
rpcInfo = "- Unknown items in NETBIOS.GetRPCInfo - Bug Reelix (Check Debug Info Item output)" + Environment.NewLine;
}
}
if (anonAccess == true)
{
rpcInfo += "- " + $"Anonymous access permitted! -> rpcclient -U \"\"%\"\" {ip}".Recolor(Color.Orange) + Environment.NewLine;
}
else
{
rpcInfo += "- No anonymous RPC access" + Environment.NewLine;
// 23 -> https://room362.com/post/2017/reset-ad-user-password-with-linux/
rpcInfo += "-- If you get access -> enumdomusers / queryuser usernameHere / setuserinfo2 userNameHere 23 'newPasswordHere'" + Environment.NewLine;
}
}
else
{
rpcInfo = "- Error: Cannot find /usr/bin/rpcclient - Please install smbclient (Includes it)".Recolor(Color.Red) + Environment.NewLine;
}
}
else
{
rpcInfo = "- No RPC Info - Try run on Linux (rpcclient)" + Environment.NewLine;
}
return rpcInfo;
}
}
}