渗透基础——获得域用户的登录信息

01 Jun 2022

0x00 前言

在域渗透中，获得了域控制器权限后，需要获得域用户的登录信息，包括域用户登录的IP地址和登录时间。通常使用的方法是查看域控制器的登录日志(Eventid=4624)。然而，人工从登录日志(Eventid=4624)中筛选出域用户登录的IP地址和登录时间需要耗费大量时间，不仅无效数据多，而且需要多次判断，所以我们需要编写程序来实现这个功能。

在实际使用过程中，为了能够适配多种环境，还需要支持本地和多种协议的远程登录。于是本文将要分享我的实现方法，开源两个工具，记录细节。

0x01 简介

本文将要介绍以下内容：

通过EventLogSession实现
通过WMI实现
开源代码

0x02 通过EventLogSession实现

通过查询资料发现，通过EventLogSession不仅支持解析本地日志内容，还支持通过RPC远程解析日志，下面介绍关于EventLogSession的开发细节

1.输出`Eventid=4624`的日志内容

C Sharp实现代码：

using System;
using System.Diagnostics.Eventing.Reader;
namespace Test1
{
    class Program
    {
        static void Main(string[] args)
        {
            var session = new EventLogSession();
            string LogName = "Security";
            string XPathQuery = "*[System/EventID=4624]";
            EventLogQuery eventLogQuery = new EventLogQuery(LogName, PathType.LogName, XPathQuery)
            {
                Session = session,
                TolerateQueryErrors = true,
                ReverseDirection = true
            };
            using (EventLogReader eventLogReader = new EventLogReader(eventLogQuery))
            {
                eventLogReader.Seek(System.IO.SeekOrigin.Begin, 0);
                do
                {
                    EventRecord eventData = eventLogReader.ReadEvent();
                    if (eventData == null)
                        break;
                    Console.WriteLine(eventData.FormatDescription());                    
                    eventData.Dispose();
                } while (true);
            }
        }
    }
}

以上代码能够查询本地日志并输出日志的完整内容

2.xml格式解析

为了便于提取内容，可以选择将输出内容转换为xml格式

关键代码：

Console.WriteLine(eventData.ToXml());

输出内容示例：

<Event xmlns='http://schemas.microsoft.com/win/2004/08/events/event'><System><Provider Name='Microsoft-Windows-Security-Auditing' Guid='{54849625-5478-4994-A5BA-3E3B0328C30D}'/><EventID>4624</EventID><Version>1</Version><Level>0</Level><Task>12544</Task><Opcode>0</Opcode><Keywords>0x8020000000000000</Keywords><TimeCreated SystemTime='2022-01-01T06:46:34.839752100Z'/><EventRecordID>393748</EventRecordID><Correlation/><Execution ProcessID='508' ThreadID='3448'/><Channel>Security</Channel><Computer>dc1.test.com</Computer><Security/></System><EventData><Data Name='SubjectUserSid'>S-1-0-0</Data><Data Name='SubjectUserName'>-</Data><Data Name='SubjectDomainName'>-</Data><Data Name='SubjectLogonId'>0x0</Data><Data Name='TargetUserSid'>S-1-5-21-254706111-4049838133-2416586677-2102</Data><Data Name='TargetUserName'>test1</Data><Data Name='TargetDomainName'>TEST</Data><Data Name='TargetLogonId'>0xa222fb5</Data><Data Name='LogonType'>3</Data><Data Name='LogonProcessName'>NtLmSsp </Data><Data Name='AuthenticationPackageName'>NTLM</Data><Data Name='WorkstationName'></Data><Data Name='LogonGuid'>{00000000-0000-0000-0000-000000000000}</Data><Data Name='TransmittedServices'>-</Data><Data Name='LmPackageName'>NTLM V2</Data><Data Name='KeyLength'>128</Data><Data Name='ProcessId'>0x0</Data><Data Name='ProcessName'>-</Data><Data Name='IpAddress'>192.168.1.3</Data><Data Name='IpPort'>45624</Data><Data Name='ImpersonationLevel'>%%1833</Data></EventData></Event>

从xml格式中，可直接提取出EventRecordID，关键代码：

XmlDocument xmldoc = new XmlDocument();
xmldoc.LoadXml(eventData.ToXml());
XmlNodeList recordid = xmldoc.GetElementsByTagName("EventRecordID");
Console.WriteLine(recordid[0].InnerText);

提取TargetUserName需要先取出Data的内容，再做一个筛选，关键代码：

XmlNodeList data = xmldoc.GetElementsByTagName("Data");
foreach (XmlNode value in data)
{
    if (value.OuterXml.Contains("TargetUserName"))
    {
        Console.WriteLine(value.InnerText);
    }
}

这里我们一共需要筛选出以下属性：

TargetUserSid
TargetDomainName
TargetUserName
IpAddress

在做字符匹配时，由于格式固定，所以我们可以从固定偏移位置得到对应的属性，避免多次判断，提高查询效率

关键代码：

XmlNodeList data = xmldoc.GetElementsByTagName("Data");
String targetUserSid = data[4].InnerText;
String targetDomainName = data[6].InnerText;
String targetUserName = data[5].InnerText;
String ipAddress = data[18].InnerText;

3.筛选判断条件

为了筛选出有效登录信息，这里对targetUserSid和ipAddress的长度做了判断，targetUserSid长度需要大于9，ipAddress长度需要大于8

关键代码：

XmlNodeList data = xmldoc.GetElementsByTagName("Data");
String targetUserSid = data[4].InnerText;
String targetDomainName = data[6].InnerText;
String targetUserName = data[5].InnerText;
String ipAddress = data[18].InnerText;
if (targetUserSid.Length > 9 && ipAddress.Length > 8)
{
    Console.WriteLine(targetUserSid);
    Console.WriteLine(targetDomainName);
    Console.WriteLine(targetUserName);
    Console.WriteLine(ipAddress);
}

4.支持筛选指定时间内的日志

可以通过修改搜索条件实现，关键代码：

string XPathQuery = "(Event/System/EventID=4624) and Event/System/TimeCreated/@SystemTime >= '2022-01-26T02:30:39' and Event/System/TimeCreated/@SystemTime <= '2022-01-26T02:31:00'";

至此，通过EventLogSession解析本地登录日志的实现代码如下：

using System;
using System.Diagnostics.Eventing.Reader;
using System.Xml;
namespace Test1
{
    class Program
    {
        static void Main(string[] args)
        {
            var session = new EventLogSession();
            string LogName = "Security";
            string XPathQuery = "(Event/System/EventID=4624) and Event/System/TimeCreated/@SystemTime >= '2022-01-26T02:30:39' and Event/System/TimeCreated/@SystemTime <= '2022-01-26T02:31:00'";

            EventLogQuery eventLogQuery = new EventLogQuery(LogName, PathType.LogName, XPathQuery)
            {
                Session = session,
                TolerateQueryErrors = true,
                ReverseDirection = true
            };
            int flagTotal = 0;
            int flagExist = 0;
            using (EventLogReader eventLogReader = new EventLogReader(eventLogQuery))
            {
                eventLogReader.Seek(System.IO.SeekOrigin.Begin, 0);
                do
                {
                    EventRecord eventData = eventLogReader.ReadEvent();
                    if (eventData == null)
                        break;
                    flagTotal++;
                    XmlDocument xmldoc = new XmlDocument();
                    xmldoc.LoadXml(eventData.ToXml());
                    XmlNodeList recordid = xmldoc.GetElementsByTagName("EventRecordID");                 
                    XmlNodeList data = xmldoc.GetElementsByTagName("Data");
                    String targetUserSid = data[4].InnerText;
                    String targetDomainName = data[6].InnerText;
                    String targetUserName = data[5].InnerText;
                    String ipAddress = data[18].InnerText;
                    if (targetUserSid.Length > 9 && ipAddress.Length > 8)
                    {
                        Console.WriteLine("[+] EventRecordID: " + recordid[0].InnerText);
                        Console.WriteLine("    TimeCreated  : " + eventData.TimeCreated);
                        Console.WriteLine("    UserSid:       " + targetUserSid);
                        Console.WriteLine("    DomainName:    " + targetDomainName);
                        Console.WriteLine("    UserName:      " + targetUserName);
                        Console.WriteLine("    IpAddress:     " + ipAddress);
                        flagExist++;
                    }
                    eventData.Dispose();
                } while (true);
                Console.WriteLine("Total: " + flagTotal + ", Exist: " + flagExist);
            }
        }

    }
}

5.支持远程登录

关键代码：

String server = "192.168.1.1";
String domain = "TEST";
String user = "Administrator";
String password = "Password@123";
SecureString securePwd = new SecureString();
foreach (char c in password)
{                
    securePwd.AppendChar(c);
}
var session = new EventLogSession(server, domain, user, securePwd, SessionAuthentication.Negotiate);
 

将以上代码整合，得出最终代码，代码已上传至github，地址如下：

https://github.com/3gstudent/Homework-of-C-Sharp/blob/master/SharpGetUserLoginIPRPC.cs

代码支持以下功能：

可使用csc.exe进行编译，支持3.5和4.0
支持本地和远程日志解析，远程日志解析使用RPC方式
支持判断条件，可筛选指定日期
自动提取信息：EventRecordID、TimeCreated、UserSid、DomainName、UserName和IpAddress

0x03 通过WMI实现

1.wmi语法测试

查询语法和属性名称可以借助wbemtest进行研究，关于wbemtest的用法可参考之前的文章《渗透基础——WMIC的使用》

查询Security日志需要管理员权限运行wbemtest

点击Query...

查询所有Security日志：

Select * from Win32_NTLogEvent Where Logfile = 'Security'

查询Eventid=4672的所有日志：

Select * from Win32_NTLogEvent Where Logfile = 'Security' AND EventCode = 4624

查询EventRecordID=113438的日志：

Select * from Win32_NTLogEvent Where Logfile = 'Security' AND RecordNumber = 113438

结合以上信息，我们不难写出wmic的查询命令：

wmic /namespace:\\root\cimv2 path win32_ntlogevent where "Logfile='Security' AND RecordNumber = 113438"

筛选出我们需要的信息：

wmic /namespace:\\root\cimv2 path win32_ntlogevent where "Logfile='Security' AND EventCode = 4624" get RecordNumber,TimeGenerated,Message

RecordNumber对应为EventRecordID，TimeGenerated为日志创建时间，Message中需要筛选出以下内容：

Security ID
Account Domain
Account Name
Source Network Address

筛选功能我们可以通过批处理或者Powershell实现，但是考虑到兼容性和后续利用接口的统一，这里同样选择C Sharp实现

2.输出`RecordNumber=131`的日志内容

实现代码：

using System;
using System.Management;
namespace Test2
{
    class Program
    {
        static void Main(string[] args)
        {
            String queryString = "SELECT * FROM Win32_NTLogEvent Where Logfile = 'Security' AND RecordNumber = 131";
            ManagementScope s = new ManagementScope("root\\CIMV2");
            SelectQuery q = new SelectQuery(queryString);
            ManagementObjectSearcher mos = new ManagementObjectSearcher(s, q);
            foreach (ManagementObject o in mos.Get())
            {
                PropertyDataCollection searcherProperties = o.Properties;
                foreach (PropertyData sp in searcherProperties)
                {
                    Console.WriteLine("Name = {0, -20}, Value = {1, -20}", sp.Name, sp.Value);
                }
            }
        }
    }
}

从输出结果中发现，同wmic的命令执行结果相同：

RecordNumber对应为EventRecordID，TimeGenerated为日志创建时间，Message中需要筛选出以下内容：

Security ID
Account Domain
Account Name
Source Network Address

3.筛选判断条件

为了筛选出有效登录信息，这里对targetUserSid和ipAddress的长度做了判断，targetUserSid长度需要大于9，ipAddress长度需要大于8

关键代码：

String Message = o.GetPropertyValue("Message").ToString();
int pos1 = Message.LastIndexOf("Security ID");
int pos2 = Message.LastIndexOf("Account Name");
int pos3 = Message.LastIndexOf("Account Domain");
int pos4 = Message.LastIndexOf("Logon ID");
int pos5 = Message.LastIndexOf("Source Network Address");
int pos6 = Message.LastIndexOf("Source Port");
int length1 = pos2 - pos1 - 16;
int length2 = pos4 - pos3 - 20;
int length3 = pos3 - pos2 - 17;
int length4 = pos6 - pos5 - 27;
if (length1 < 0 || length2 < 0 || length3 < 0 || length4 < 0)
    continue;
String targetUserSid = Message.Substring(pos1+14, length1);
String targetDomainName = Message.Substring(pos3 + 17, length2);
String targetUserName = Message.Substring(pos2 + 15, length3);
String ipAddress = Message.Substring(pos5 + 24, length4);
if (targetUserSid.Length > 9 && ipAddress.Length > 8)
{
    Console.WriteLine("[+] EventRecordID: " + o.GetPropertyValue("RecordNumber"));
    Console.WriteLine("    TimeCreated  : " + o.GetPropertyValue("TimeGenerated"));
    Console.WriteLine("    UserSid:       " + targetUserSid);
    Console.WriteLine("    DomainName:    " + targetDomainName);
    Console.WriteLine("    UserName:      " + targetUserName);
    Console.WriteLine("    IpAddress:     " + ipAddress);
}

4.支持筛选指定时间内的日志

可以通过修改搜索条件实现，关键代码：

String queryString = "SELECT * FROM Win32_NTLogEvent Where Logfile = 'Security' AND EventCode = 4624 AND TimeGenerated>=20210526 AND TimeGenerated<=20220426";

至此，通过WMI解析本地登录日志的实现代码如下：

using System;
using System.Management;
namespace Test2
{
    class Program
    {
        static void Main(string[] args)
        {
            String queryString = "SELECT * FROM Win32_NTLogEvent Where Logfile = 'Security' AND EventCode = 4624 AND TimeGenerated>=20210526 AND TimeGenerated<=20220426";
            ManagementScope s = new ManagementScope("root\\CIMV2");
            SelectQuery q = new SelectQuery(queryString);
            ManagementObjectSearcher mos = new ManagementObjectSearcher(s, q);
            int flagTotal = 0;
            int flagExist = 0;
            foreach (ManagementObject o in mos.Get())
            {
                flagTotal++;
                String Message = o.GetPropertyValue("Message").ToString();
                int pos1 = Message.LastIndexOf("Security ID");
                int pos2 = Message.LastIndexOf("Account Name");
                int pos3 = Message.LastIndexOf("Account Domain");
                int pos4 = Message.LastIndexOf("Logon ID");
                int pos5 = Message.LastIndexOf("Source Network Address");
                int pos6 = Message.LastIndexOf("Source Port");
                int length1 = pos2 - pos1 - 16;
                int length2 = pos4 - pos3 - 20;
                int length3 = pos3 - pos2 - 17;
                int length4 = pos6 - pos5 - 27;
                if (length1 < 0 || length2 < 0 || length3 < 0 || length4 < 0)
                    continue;
                String targetUserSid = Message.Substring(pos1+14, length1);
                String targetDomainName = Message.Substring(pos3 + 17, length2);
                String targetUserName = Message.Substring(pos2 + 15, length3);
                String ipAddress = Message.Substring(pos5 + 24, length4);
                {
                    Console.WriteLine("[+] EventRecordID: " + o.GetPropertyValue("RecordNumber"));
                    Console.WriteLine("    TimeCreated  : " + o.GetPropertyValue("TimeGenerated"));
                    Console.WriteLine("    UserSid:       " + targetUserSid);
                    Console.WriteLine("    DomainName:    " + targetDomainName);
                    Console.WriteLine("    UserName:      " + targetUserName);
                    Console.WriteLine("    IpAddress:     " + ipAddress);
                    flagExist++;
                }             
            }
            Console.WriteLine("Total: " + flagTotal + ", Exist: " + flagExist);
        }
    }
}

5.支持远程登录

关键代码：

var opt = new ConnectionOptions(); ;
opt.Username = "TEST\\Administrator";
opt.Password = "Password@123";
ManagementScope s = new ManagementScope("\\\\192.168.1.1\\root\\CIMV2", opt);

将以上代码整合，得出最终代码，代码已上传至github，地址如下：

https://github.com/3gstudent/Homework-of-C-Sharp/blob/master/SharpGetUserLoginIPWMI.cs

代码支持以下功能：

可使用csc.exe进行编译，支持3.5和4.0
支持本地和远程日志解析，远程日志解析使用WMI方式
支持判断条件，可筛选指定日期
自动提取信息：EventRecordID、TimeCreated、UserSid、DomainName、UserName和IpAddress

0x04 小结

本文介绍了获得域用户登录信息的实现细节，开源两个工具SharpGetUserLoginIPRPC.cs和SharpGetUserLoginIPWMI.cs，在通信效率上，RPC要快于WMI。

Good in study, attitude and health

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