Sublime Core Feed

This repo contains open-source Rules for Sublime, a free and open platform for detecting and preventing email attacks like BEC, malware, and credential phishing.

Sublime Security

Last updated Feb 6th, 2026

Feed Source

GitHub

Tactic or Technique is

Rule Name & Severity	Author	Last Updated	Labels
Reconnaissance: Hotel booking reply-to redirect	Sublime Security	11d ago Jan 27th, 2026	BEC/Fraud Free email provider Social engineering Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/reconnaissance-hotel-booking-reply-to-redirect-08c36035
Reconnaissance: Short generic greeting message	Sublime Security	11d ago Jan 27th, 2026	BEC/Fraud Callback Phishing Social engineering Free email provider Content analysis Header analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/reconnaissance-short-generic-greeting-message-c67dedab
Request for Quote or Purchase (RFQ\|RFP) with suspicious sender or recipient pattern	Sublime Security	23d ago Jan 15th, 2026	BEC/Fraud Evasion Free email provider Content analysis Natural Language Understanding URL analysis	/feeds/core/detection-rules/request-for-quote-or-purchase-rfqorrfp-with-suspicious-sender-or-recipient-pattern-2ac0d329
Scam: Piano giveaway	Sublime Security	1mo ago Dec 11th, 2025	BEC/Fraud Free email provider Content analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/scam-piano-giveaway-1a91a203
Service abuse: Free provider with SendGrid routing	Sublime Security	30d ago Jan 8th, 2026	Credential Phishing Free email provider Evasion Header analysis Sender analysis	/feeds/core/detection-rules/service-abuse-free-provider-with-sendgrid-routing-3079cacb
Service abuse: Google Drive share from an unsolicited reply-to address	Sublime Security	6mo ago Aug 5th, 2025	BEC/Fraud Callback Phishing Credential Phishing Free email provider Social engineering Free file host Header analysis Sender analysis	/feeds/core/detection-rules/service-abuse-google-drive-share-from-an-unsolicited-reply-to-address-4581ec0c
Service abuse: Google Drive share from new reply-to domain	Sublime Security	2mo ago Nov 13th, 2025	BEC/Fraud Callback Phishing Credential Phishing Free email provider Social engineering Free file host Header analysis Sender analysis Whois	/feeds/core/detection-rules/service-abuse-google-drive-share-from-new-reply-to-domain-c1a2d367
Spam: Default Microsoft Exchange Online sender domain (onmicrosoft.com)	Sublime Security	26d ago Jan 12th, 2026	Callback Phishing Credential Phishing Spam Free email provider Impersonation: Brand Social engineering Content analysis Sender analysis	/feeds/core/detection-rules/spam-default-microsoft-exchange-online-sender-domain-onmicrosoftcom-3f2a64ce
Spam: Fake dating profile notification	Sublime Security	2mo ago Dec 3rd, 2025	Spam Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis	/feeds/core/detection-rules/spam-fake-dating-profile-notification-0f33fea2
Spam: New link domain (<=10d) and emojis	Sublime Security	6mo ago Jul 16th, 2025	Spam Free email provider Content analysis Sender analysis URL analysis Whois	/feeds/core/detection-rules/spam-new-link-domain-less10d-and-emojis-33677993
Spam: Sexually explicit Google Drive share	Sublime Security	6mo ago Aug 5th, 2025	Spam Social engineering Free email provider Content analysis Sender analysis	/feeds/core/detection-rules/spam-sexually-explicit-google-drive-share-3f951c06
Spam: Sexually explicit Google group invitation	Sublime Security	2mo ago Nov 12th, 2025	Spam Free email provider Social engineering Content analysis Sender analysis	/feeds/core/detection-rules/spam-sexually-explicit-google-group-invitation-4e0bec29
Spam: Sexually explicit Looker Studio report	Sublime Security	4mo ago Oct 2nd, 2025	Spam Social engineering Free email provider Content analysis Sender analysis	/feeds/core/detection-rules/spam-sexually-explicit-looker-studio-report-f1e649cd
Spam: SMTP & Proxy Communications in Email Body	Sublime Security	2mo ago Dec 2nd, 2025	Spam Free email provider Content analysis	/feeds/core/detection-rules/spam-smtp-and-proxy-communications-in-email-body-2bdc6a3b
Spam: Unsolicited malformed PDF	Sublime Security	6mo ago Jul 16th, 2025	Spam Evasion Free email provider PDF Content analysis File analysis Sender analysis	/feeds/core/detection-rules/spam-unsolicited-malformed-pdf-f0c50031
Spam: URL shortener with short body content and emojis	Sublime Security	26d ago Jan 12th, 2026	Spam Free email provider Content analysis Sender analysis URL analysis	/feeds/core/detection-rules/spam-url-shortener-with-short-body-content-and-emojis-b7797e4c
Suspicious mailer received from Gmail servers	Sublime Security	6mo ago Jul 16th, 2025	Callback Phishing Spam Free email provider Social engineering Header analysis	/feeds/core/detection-rules/suspicious-mailer-received-from-gmail-servers-f05f04ee
Suspicious request for financial information	Sublime Security	2mo ago Dec 6th, 2025	BEC/Fraud Free email provider Impersonation: Employee Impersonation: VIP Social engineering Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/suspicious-request-for-financial-information-4ebdaa4d
Suspicious SharePoint file sharing	Sublime Security	6mo ago Aug 5th, 2025	Credential Phishing Free email provider Free file host OneNote PDF Content analysis Header analysis Sender analysis URL analysis	/feeds/core/detection-rules/suspicious-sharepoint-file-sharing-971c3d9c
VIP Impersonation via Google Group relay with suspicious indicators	Sublime Security	2mo ago Nov 12th, 2025	BEC/Fraud Credential Phishing Malware/Ransomware Evasion Free email provider Impersonation: Employee Social engineering Spoofing Content analysis Header analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/vip-impersonation-via-google-group-relay-with-suspicious-indicators-57f9cd3b

70 Rules

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