Website and email security assessments

⚡ SMTP Penetration Testing — High-Level Awareness & Defensive Guide (Lab Only) ✉️🔍 SMTP remains the backbone of email delivery and a frequent target in assessments. Ethical SMTP testing (in authorized scopes) helps teams find misconfigurations, insecure relays, and weak authentication that threat actors exploit for phishing, spoofing, or mail relay abuse. 🛡️📬 🔎 What testers look for (high level): 🔹Open relays & misconfigured servers that allow unauthenticated forwarding. 🔓↔️ 🔹Authentication weaknesses (plain-text auth, weak credentials, missing STARTTLS enforcement). 🔑⚠️ 🔹Encryption gaps — lack of STARTTLS, opportunistic TLS, or missing DANE/ MTA-STS validation. 🔐❌ 🔹Spoofing & spoof-relay vectors — missing SPF, DKIM, and DMARC records or incorrect policies. 🕵️♂️✉️ 🔹Abuse paths — email injection via web forms, exposed submission ports, or weak rate-limiting. 🧩🚨 🛠️ Safe assessment techniques & tooling (lab/authorized): Use non-destructive probes and verify results with server owners. Common tools and checks include: smtp-check, swaks for scripted exchanges, nmap SMTP scripts, MX/DNS lookups (dig mx), and SPF/DKIM/DMARC validators. Log review and controlled test mails help confirm real-world impact. 🧰📋 🛡️ Defensive checklist (quick wins): 🔹Enforce STARTTLS and prefer strict TLS policies (DANE / MTA-STS where possible). 🔒 🔹Publish and enforce SPF, DKIM, and DMARC with a proper quarantine/reject policy. 📜✅ 🔹Disable open relay behavior; require auth for submission and relay. 🚫↔️ 🔹Harden authentication: strong passwords, rate-limits, and suspicious login alerts; consider MFA for admin consoles. 🔑⛔️ 🔹Monitor mail queues, outbound volume, and bounce patterns; centralize email logs in SIEM for correlation. 📊👀 🔹Keep MTAs and mail-related libraries patched; limit exposed management interfaces and restrict by IP/network. 🔧🔁 ⚠️ Disclaimer: For educational & authorized use only. Perform SMTP testing only on systems you own or have explicit written permission to assess. Never send harmful or unsolicited emails during tests; unauthorized testing is illegal and unethical. 🚫📝 #SMTP #EmailSecurity #PenTesting #InfoSec #CyberSecurity #SPF #DKIM #DMARC #MTA #BlueTeam #EthicalHacking ✉️🛡️

Email URL Analysis Email URL Analysis is the process of inspecting and evaluating URLs within emails to identify potential threats, such as phishing links or malware. - Link - When analyzing suspicious emails, it’s crucial to handle links carefully. Instead of clicking, right-click the link and choose "Copy Link Location" to inspect the URL without interacting. This prevents the risk of activating potential malware embedded in the link. Always analyze URLs in a safe environment before further action. - Sublime Text - Use the "Sublime Text" editor for analyzing email headers or URLs. In the context of email URL analysis, search for "HTTP" (or "HTTPS") to identify and inspect embedded links. Also, search for the <a> tag, which is used for hyperlinks. This allows you to view the full URL without clicking, providing a safe method to identify potential phishing or malicious sites. - CyberChef - Use CyberChef for email analysis tasks such as decoding quoted-printable strings, extracting URLs, and defanging malicious links. The "From Quoted Printable" operation helps decode encoded content, while the "Extract URLs" function identifies all URLs. To prevent accidental clicks on malicious links, use the "Defang URL" operation, which modifies URLs to render them safe for analysis without activating the link. - Email IOC Extractor - Email IOC Extractor is used for email forensic analysis, designed to automatically extract Indicators of Compromise (IOCs) from email files. It captures critical components such as IP addresses, URLs, email headers, and attachments. - Analyze URL Reputation Check - When performing URL reputation checks, it's important not to blindly trust the results of automated tools. Understanding the methodology behind them is crucial for making informed decisions during threat analysis. • URL2PNG: Captures screenshots of a webpage for visual inspection • urlscan.io: Provides detailed scans of URLs, including resource loading and script behavior • VirusTotal: Aggregates results from multiple antivirus engines • URLVoid: Checks URL reputation across multiple databases • wannabrowser: Mimics various browsers to test how a URL responds to • Unshorten: Expands shortened URLs for full visibility • PhishTank: Identifies phishing websites through a community-driven database • URLHaus: Focuses on malicious URLs, specifically for distributing malware • Google Safe Browsing: Protects against malicious sites by warning users • JoeSandbox: Performs in-depth dynamic analysis of URLs and attached files https://lnkd.in/eXQq8eVT https://lnkd.in/enzgnX5s https://phishtank.org/ https://www.url2png.com/ https://urlscan.io/ https://lnkd.in/evBWtnCk https://www.urlvoid.com/ https://lnkd.in/e3cci-XW https://unshorten.it/ https://urlhaus.abuse.ch/ https://lnkd.in/eRcG4Gv2 https://lnkd.in/e2ryjFbD #EmailSecurity #URLAnalysis #ThreatDetection #SafeBrowsing #SOC

[Email Security - Falling at first hurdles?] Email Security failures I am still seeing: - DMARC still in p=none with no reporting (how will you progress to reject without reporting?) - DMARC on .onmicrosoft[.]com domains -> these may be acting as SMTP proxy domains. - Email Encryption - Not empowering users to be proactive with malicious emails with user tips (are you really getting your ROI on security awareness training?) - Improper Scoping of Defender for Office Policies to groups/users instead of domains such as Safe Attachment policies when no further fine-graining policies are applied - Not extending Domain impersonation to all domains you own + any partners/suppliers/subsidiaries - Not using user impersonation for VIP users - Not blocking Email AutoForwarding (common Persistence technique - there are countless ways to limit/block this in #Exchange or MDO) - Not using TABL to block abused TLDs (both domains and URLs) - Using complicated rule exceptions instead of a SecOps Mailboxes for security Teams - Doubling up on Email Gateways needlessly and watching them both not work in their best capacity (journalling is honestly a valid use-case for dual gateways) - Allowing domains to bypass anti-spam instead of using an Exchange Transport rule - Not checking your homework with Config Analyzer Email security can be intimidating in defender, with many buttons and policies you can enable (I encourage you to check out these mindmaps https://lnkd.in/eJ3j8UQk by James Agombar). Chances are if malicious emails are getting in/out then there is still hardening that can be done. This is not a complete list of things you can do, there is plenty of things you can add on top but please please don't forget the basics such as DMARC. Every time I see a major breach in the news I always check DMARC and 7/10 times its not correctly configured (causation or correlation? will never know) and 99% of the time they haven't configured DMARC for their MOREA domain which may be acting as the #SMTP proxy address. Theres also the more debatable MDO controls such as dynamic delivery...personally think its best left off as it can be a bad UX and bad experience for a #SOC responder trying to purge emails. I also think allowing End users to control their own safe senders is a SOC responder nightmare as it overrides admin controls. With collaboration now extending to other areas such as Teams, Slacks there is yet another set of policies and controls to enable.... maybe I'll talk about those in another post. #Purview #MDO #Defender #Phish #Security #Cybersecurity #DefenceInDepth