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 6th, 2026

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Rule Name & Severity	Author	Last Updated	Labels
Attachment: Callback phishing solicitation via pdf file	Sublime Security	5mo ago Aug 5th, 2025	Callback Phishing Evasion Free email provider Out of band pivot PDF Social engineering Exif analysis File analysis Optical Character Recognition Sender analysis	/feeds/core/detection-rules/attachment-callback-phishing-solicitation-via-pdf-file-ac33f097
Attachment: Legal themed message or PDF with suspicious indicators	Sublime Security	1mo ago Dec 1st, 2025	Credential Phishing Extortion BEC/Fraud Evasion PDF Social engineering Content analysis File analysis Natural Language Understanding Optical Character Recognition URL analysis Whois Header analysis Exif analysis	/feeds/core/detection-rules/attachment-legal-themed-message-or-pdf-with-suspicious-indicators-19133301
Body: Embedded email headers indicative of thread hijacking/abuse	Sublime Security	1mo ago Dec 1st, 2025	Credential Phishing BEC/Fraud Spam Evasion Social engineering Spoofing Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/body-embedded-email-headers-indicative-of-thread-hijackingabuse-6e8eeebb
Brand impersonation: Google Drive fake file share	Sublime Security	18d ago Dec 19th, 2025	Credential Phishing Malware/Ransomware Impersonation: Brand Social engineering Content analysis Header analysis URL analysis Computer Vision	/feeds/core/detection-rules/brand-impersonation-google-drive-fake-file-share-b424a941
Brand impersonation: Microsoft with low reputation links	Sublime Security	27d ago Dec 10th, 2025	Credential Phishing Free file host Image as content Impersonation: Brand Social engineering Computer Vision Content analysis File analysis Header analysis Natural Language Understanding Optical Character Recognition Sender analysis URL analysis	/feeds/core/detection-rules/brand-impersonation-microsoft-with-low-reputation-links-b59201b6
Brand impersonation: Sharepoint fake file share	Sublime Security	27d ago Dec 10th, 2025	Credential Phishing Malware/Ransomware Impersonation: Brand Social engineering Content analysis Header analysis URL analysis Computer Vision	/feeds/core/detection-rules/brand-impersonation-sharepoint-fake-file-share-ff8b296b
Brand impersonation: Wells Fargo	Sublime Security	11mo ago Jan 15th, 2025	Credential Phishing Impersonation: Brand Lookalike domain Social engineering Content analysis Sender analysis	/feeds/core/detection-rules/brand-impersonation-wells-fargo-02d7301f
Fake message thread - Untrusted sender with a mismatched freemail reply-to address	Sublime Security	5mo ago Aug 5th, 2025	BEC/Fraud Free email provider Social engineering Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/fake-message-thread-untrusted-sender-with-a-mismatched-freemail-reply-to-address-ca64e819
Fake thread with suspicious indicators	Sublime Security	28d ago Dec 9th, 2025	BEC/Fraud Credential Phishing Spam Evasion Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/fake-thread-with-suspicious-indicators-c2e18a57
HTML smuggling with atob in message body	Sublime Security	3y ago Aug 17th, 2023	Credential Phishing Malware/Ransomware HTML smuggling Content analysis HTML analysis	/feeds/core/detection-rules/html-smuggling-with-atob-in-message-body-0f86851f
Impersonation: Fake Gmail attachment	Sublime Security	5mo ago Aug 5th, 2025	Credential Phishing Impersonation: Brand Content analysis File analysis Sender analysis	/feeds/core/detection-rules/impersonation-fake-gmail-attachment-0f5a4e14
Impersonation: SharePoint reply header anomaly	Sublime Security	5mo ago Aug 5th, 2025	Credential Phishing Social engineering Impersonation: Brand Evasion Spoofing Header analysis Content analysis Sender analysis	/feeds/core/detection-rules/impersonation-sharepoint-reply-header-anomaly-78875848
Impersonation: Suspected supplier impersonation with suspicious content	Sublime Security	11mo ago Feb 3rd, 2025	BEC/Fraud Evasion Free email provider Lookalike domain Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis Whois	/feeds/core/detection-rules/impersonation-suspected-supplier-impersonation-with-suspicious-content-63d8b1ce
Link: Secure SharePoint file share from new or unusual sender	Sublime Security	4mo ago Sep 5th, 2025	Credential Phishing Free file host Evasion Content analysis Sender analysis	/feeds/core/detection-rules/link-secure-sharepoint-file-share-from-new-or-unusual-sender-74ed3020
Link to Google Apps Script macro via comment tagging	Sublime Security	5mo ago Aug 5th, 2025	Credential Phishing Malware/Ransomware Social engineering Content analysis Sender analysis URL analysis	/feeds/core/detection-rules/link-to-google-apps-script-macro-via-comment-tagging-66fecd30
Link: Zoho form link from unsolicited sender	Sublime Security	5mo ago Aug 5th, 2025	Callback Phishing Free file host Content analysis URL analysis Sender analysis	/feeds/core/detection-rules/link-zoho-form-link-from-unsolicited-sender-eb04a9f2
Malformed URL prefix	Sublime Security	4mo ago Sep 4th, 2025	Credential Phishing Malware/Ransomware Evasion URL analysis	/feeds/core/detection-rules/malformed-url-prefix-4e659d28
Service abuse: Random Google Firebase sender address with suspicious content	Sublime Security	1mo ago Nov 26th, 2025	Spam Credential Phishing Free subdomain host Social engineering Content analysis Header analysis HTML analysis Natural Language Understanding Sender analysis URL analysis Whois	/feeds/core/detection-rules/service-abuse-random-google-firebase-sender-address-with-suspicious-content-9f8899a9
Spam: Attendee list solicitation	Sublime Security	4mo ago Aug 29th, 2025	Spam Content analysis Sender analysis	/feeds/core/detection-rules/spam-attendee-list-solicitation-69715b62
Spam: Fake photo share	Sublime Security	1mo ago Nov 8th, 2025	Spam Evasion Social engineering Content analysis Sender analysis URL analysis Whois	/feeds/core/detection-rules/spam-fake-photo-share-eb086f7d
Spam: New link domain (<=10d) and emojis	Sublime Security	5mo 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: URL shortener with short body content and emojis	Sublime Security	5mo ago Jul 23rd, 2025	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 invoice reference with missing or image-only attachments	Sublime Security	1mo ago Dec 2nd, 2025	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
URL with Unicode U+2044 (⁄) or U+2215 (∕) characters	@delivr_to	2y ago Feb 23rd, 2024	Credential Phishing Evasion Social engineering Content analysis URL analysis	/feeds/core/detection-rules/url-with-unicode-u2044-or-u2215-characters-12069f5b
VIP impersonation: Fake thread with display name match, email mismatch	Sublime Security	2y ago Jul 29th, 2024	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 with charitable donation fraud	Sublime Security	1mo 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

26 Rules