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 Jan 23rd, 2026

Feed Source

GitHub

Detection Method is

Rule Name & Severity	Author	Last Updated	Labels
Spam: SMTP & Proxy Communications in Email Body	Sublime Security	1mo 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	12d 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
Spam: Website errors solicitation	Sublime Security	1mo ago Dec 11th, 2025	Spam Content analysis Sender analysis Natural Language Understanding	/feeds/core/detection-rules/spam-website-errors-solicitation-122ea794
Spoofable internal domain with suspicious signals	Sublime Security	6mo ago Jul 23rd, 2025	Credential Phishing Free file host Free subdomain host Social engineering Spoofing Content analysis Header analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/spoofable-internal-domain-with-suspicious-signals-40089d69
Subject and sender display name contains matching long alphanumeric string	Sublime Security	12d ago Jan 12th, 2026	Malware/Ransomware Credential Phishing Evasion Social engineering Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/subject-and-sender-display-name-contains-matching-long-alphanumeric-string-a8a0c831
Subject: Suspicious bracketed reference	Sublime Security	12d ago Jan 12th, 2026	Credential Phishing Evasion Impersonation: Brand Header analysis Content analysis	/feeds/core/detection-rules/subject-suspicious-bracketed-reference-663dbce4
Suspected cross-site scripting (XSS) found in subject	Sublime Security	4mo ago Sep 4th, 2025	Credential Phishing Evasion Scripting Content analysis Sender analysis	/feeds/core/detection-rules/suspected-cross-site-scripting-xss-found-in-subject-8a946cfa
Suspected lookalike domain with suspicious language	Sublime Security	12d ago Jan 12th, 2026	BEC/Fraud Evasion Lookalike domain Social engineering Content analysis Natural Language Understanding Sender analysis Whois	/feeds/core/detection-rules/suspected-lookalike-domain-with-suspicious-language-3674ced0
Suspected WordPress abuse with cross-site scripting (XSS) indicators	Sublime Security	5mo ago Aug 5th, 2025	Malware/Ransomware Credential Phishing Scripting Impersonation: Brand Social engineering Content analysis Sender analysis	/feeds/core/detection-rules/suspected-wordpress-abuse-with-cross-site-scripting-xss-indicators-9c21225b
Suspicious attachment with unscannable Cloudflare link	Sublime Security	12d ago Jan 12th, 2026	Credential Phishing Evasion PDF Social engineering Impersonation: Employee Impersonation: VIP File analysis URL analysis Sender analysis Content analysis Header analysis Natural Language Understanding	/feeds/core/detection-rules/suspicious-attachment-with-unscannable-cloudflare-link-00f92b6f
Suspicious DocuSign share from new domain	Sublime Security	5mo ago Aug 5th, 2025	BEC/Fraud Credential Phishing Evasion Free file host Impersonation: Brand Social engineering Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/suspicious-docusign-share-from-new-domain-d430a1f3
Suspicious invoice reference with missing or image-only attachments	Sublime Security	12d ago Jan 12th, 2026	Credential Phishing Social engineering Content analysis Computer Vision File analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/suspicious-invoice-reference-with-missing-or-image-only-attachments-466c1680
Suspicious link to Looker Studio (lookerstudio.google.com) from a new and unsolicited sender	Sublime Security	12d ago Jan 12th, 2026	Credential Phishing Evasion Social engineering Content analysis Sender analysis URL analysis	/feeds/core/detection-rules/suspicious-link-to-looker-studio-lookerstudiogooglecom-from-a-new-and-unsolicited-sender-dbb50cb4
Suspicious message with unscannable Cloudflare link	Sublime Security	4mo ago Sep 22nd, 2025	Credential Phishing Content analysis Header analysis URL analysis Sender analysis	/feeds/core/detection-rules/suspicious-message-with-unscannable-cloudflare-link-70ea21f9
Suspicious message with unscannable Vercel link	Sublime Security	6mo ago Jul 16th, 2025	Credential Phishing Evasion Content analysis Header analysis Sender analysis URL analysis	/feeds/core/detection-rules/suspicious-message-with-unscannable-vercel-link-b5acffe7
Suspicious newly registered reply-to domain with engaging financial or urgent language	Sublime Security	12d ago Jan 12th, 2026	BEC/Fraud Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis Whois	/feeds/core/detection-rules/suspicious-newly-registered-reply-to-domain-with-engaging-financial-or-urgent-language-db4d9bb3
Suspicious recipient pattern and language with low reputation link to login	Sublime Security	12d ago Jan 12th, 2026	Credential Phishing Social engineering Computer Vision Content analysis Header analysis Natural Language Understanding Optical Character Recognition Sender analysis URL analysis URL screenshot	/feeds/core/detection-rules/suspicious-recipient-pattern-and-language-with-low-reputation-link-to-login-a8ea0402
Suspicious recipients pattern with NLU credential theft indicators	Sublime Security	12d ago Jan 12th, 2026	Credential Phishing Evasion Content analysis Header analysis Natural Language Understanding URL analysis	/feeds/core/detection-rules/suspicious-recipients-pattern-with-nlu-credential-theft-indicators-8e121c3e
Suspicious recipients pattern with no Compauth pass and suspicious content	Sublime Security	12d ago Jan 12th, 2026	Content analysis Computer Vision Header analysis Natural Language Understanding URL analysis URL screenshot	/feeds/core/detection-rules/suspicious-recipients-pattern-with-no-compauth-pass-and-suspicious-content-34fb65f6
Suspicious request for financial information	Sublime Security	1mo 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 sender display name with long procedurally generated text blob	Sublime Security	6mo ago Jul 16th, 2025	Credential Phishing Evasion Content analysis Sender analysis	/feeds/core/detection-rules/suspicious-sender-display-name-with-long-procedurally-generated-text-blob-2a40b043
Suspicious SharePoint file sharing	Sublime Security	5mo 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
Suspicious subject with long procedurally generated text blob	Sublime Security	12d ago Jan 12th, 2026	Credential Phishing Spam Evasion Content analysis Sender analysis	/feeds/core/detection-rules/suspicious-subject-with-long-procedurally-generated-text-blob-e819593d
Truth Social infrastructure abuse via link redirect	Sublime Security	6mo ago Jul 16th, 2025	Credential Phishing Malware/Ransomware Spam Evasion Impersonation: Brand Social engineering Content analysis Sender analysis URL analysis	/feeds/core/detection-rules/truth-social-infrastructure-abuse-via-link-redirect-aaaa30a8
Twitter infrastructure abuse via link shortener	Sublime Security	6mo ago Jul 16th, 2025	Credential Phishing Malware/Ransomware Spam Evasion Impersonation: Brand Social engineering Content analysis Sender analysis URL analysis	/feeds/core/detection-rules/twitter-infrastructure-abuse-via-link-shortener-99ca165e
Unicode QR code	Sublime Security	5mo ago Aug 25th, 2025	Credential Phishing Evasion Content analysis Sender analysis QR code analysis	/feeds/core/detection-rules/unicode-qr-code-1a0bdd25
URL with Unicode U+2044 (⁄) or U+2215 (∕) characters	@delivr_to	12d ago Jan 12th, 2026	Credential Phishing Evasion Social engineering Content analysis URL analysis	/feeds/core/detection-rules/url-with-unicode-u2044-or-u2215-characters-12069f5b
Vendor impersonation: Thread hijacking with typosquat domain	Sublime Security	12d ago Jan 12th, 2026	BEC/Fraud Lookalike domain Social engineering Spoofing Content analysis Natural Language Understanding Sender analysis Whois	/feeds/core/detection-rules/vendor-impersonation-thread-hijacking-with-typosquat-domain-9c2f38ed
Venmo payment request abuse	Sublime Security	4mo ago Sep 5th, 2025	Callback Phishing BEC/Fraud Social engineering Impersonation: Brand Evasion Natural Language Understanding Content analysis Sender analysis HTML analysis	/feeds/core/detection-rules/venmo-payment-request-abuse-4450639a
VIP impersonation: Fake thread with display name match, email mismatch	Sublime Security	12d ago Jan 12th, 2026	BEC/Fraud Evasion Impersonation: VIP Social engineering Spoofing Content analysis Header analysis Sender analysis Whois	/feeds/core/detection-rules/vip-impersonation-fake-thread-with-display-name-match-email-mismatch-11cc3e28
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
VIP impersonation with BEC language (near match, untrusted sender)	Sublime Security	12d ago Jan 12th, 2026	BEC/Fraud Impersonation: VIP Social engineering Content analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/vip-impersonation-with-bec-language-near-match-untrusted-sender-303081da
VIP impersonation with charitable donation fraud	Sublime Security	2mo ago Nov 12th, 2025	BEC/Fraud Impersonation: Employee Impersonation: VIP Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/vip-impersonation-with-charitable-donation-fraud-35a56b8e
VIP impersonation with invoicing request	Sublime Security	2y ago Apr 23rd, 2024	BEC/Fraud Impersonation: VIP Content analysis Header analysis Natural Language Understanding	/feeds/core/detection-rules/vip-impersonation-with-invoicing-request-a60f89a0
VIP impersonation with urgent request (strict match, untrusted sender)	Sublime Security	12d ago Jan 12th, 2026	BEC/Fraud Impersonation: VIP Social engineering Content analysis Content analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/vip-impersonation-with-urgent-request-strict-match-untrusted-sender-0dd1fa60
Xero infrastructure abuse	Sublime Security	2mo ago Nov 3rd, 2025	Credential Phishing Evasion Social engineering Content analysis Header analysis Natural Language Understanding URL analysis	/feeds/core/detection-rules/xero-infrastructure-abuse-918c4bd3
Xero invoice abuse	Sublime Security	1mo ago Dec 17th, 2025	BEC/Fraud Credential Phishing Impersonation: Brand Impersonation: Employee Social engineering Natural Language Understanding Content analysis Sender analysis	/feeds/core/detection-rules/xero-invoice-abuse-6538c600

438 Rules

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