{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/imap/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["medium"],"_cs_tags":["email-security","threat-detection","imap"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eA security-conscious individual has developed a self-hosted email threat detection tool, \u0026ldquo;VerdictMail,\u0026rdquo; designed to enhance email security through real-time analysis and machine learning. Released in March 2026, the tool leverages IMAP IDLE to monitor incoming emails. VerdictMail then performs a series of enrichment steps, including SPF, DKIM, and DMARC validation to verify sender authenticity. DNSBL lookups identify potential spam sources, while WHOIS queries provide registrant information. Additionally, the tool integrates with URLhaus and VirusTotal to assess the reputation of embedded URLs and attachments. Finally, VerdictMail employs a provider-agnostic Large Language Model (LLM) to render a final verdict on the email\u0026rsquo;s threat level, providing a comprehensive security layer for personal or small-scale email infrastructure.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003cp\u003eThis tool is a defensive measure, not an attack. The below steps describe how the tool functions to analyze potential attacks.\u003c/p\u003e\n\u003col\u003e\n\u003cli\u003e\u003cstrong\u003eEmail Reception:\u003c/strong\u003e VerdictMail monitors a designated IMAP mailbox using the IMAP IDLE protocol for real-time email arrival.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eHeader Analysis:\u003c/strong\u003e Upon receiving a new email, the tool extracts relevant headers, including Sender, From, Reply-To, and Message-ID.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eAuthentication Checks:\u003c/strong\u003e VerdictMail performs SPF, DKIM, and DMARC checks to validate the sender\u0026rsquo;s authenticity and domain reputation.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eReputation Lookups:\u003c/strong\u003e The tool queries DNSBLs (DNS Blacklists) to identify known spam sources and malicious IPs associated with the sender.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eWHOIS Enrichment:\u003c/strong\u003e WHOIS lookups are conducted on the sender\u0026rsquo;s domain to gather registrant information and assess the domain\u0026rsquo;s legitimacy.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eURL and Attachment Scanning:\u003c/strong\u003e URLs within the email body are extracted and checked against URLhaus for known malicious URLs. Attachments are submitted to VirusTotal for malware scanning.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eLLM Verdict Generation:\u003c/strong\u003e All gathered data is fed into a provider-agnostic Large Language Model (LLM), which analyzes the information and generates a threat verdict.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eAlerting/Quarantine:\u003c/strong\u003e Based on the LLM\u0026rsquo;s verdict, VerdictMail can flag the email as suspicious, quarantine it, or generate an alert for further investigation.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eVerdictMail aims to reduce the risk of successful phishing attacks, malware infections, and business email compromise (BEC). By automatically analyzing emails and providing a threat verdict, it helps users identify and avoid potentially harmful messages. While the exact number of users is unknown, the tool could prevent financial losses, data breaches, and reputational damage for individuals and small organizations adopting it.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eConsider implementing similar multi-stage enrichment techniques in existing email security solutions by incorporating SPF, DKIM, and DMARC validation (Attack Chain Step 3).\u003c/li\u003e\n\u003cli\u003eIntegrate threat intelligence feeds like URLhaus (Attack Chain Step 6) and VirusTotal (Attack Chain Step 6) into email security workflows to identify malicious URLs and attachments.\u003c/li\u003e\n\u003cli\u003eExplore using LLMs for email threat assessment as an additional layer of security (Attack Chain Step 7).\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-03-18T10:00:00Z","date_published":"2026-03-18T10:00:00Z","id":"/briefs/2026-03-verdictmail/","summary":"A user created a self-hosted email threat detection tool, named VerdictMail, employing IMAP IDLE for real-time monitoring and multi-stage enrichment via SPF, DKIM, DMARC, DNSBL, WHOIS, URLhaus, and VirusTotal, coupled with an LLM for threat assessment.","title":"Self-Hosted Email Threat Detection Tool","url":"https://feed.craftedsignal.io/briefs/2026-03-verdictmail/"}],"language":"en","title":"CraftedSignal Threat Feed — Imap","version":"https://jsonfeed.org/version/1.1"}