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 Apr 24th, 2026

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GitHub

Rule Name & Severity	Author	Last Updated	Labels
Anthropic Magic String in HTML	Sublime Security	2mo ago Feb 9th, 2026	Malware/Ransomware Exploit Content analysis
Attachment: Callback phishing solicitation via pdf file	Sublime Security	8mo 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
Attachment: Legal themed message or PDF with suspicious indicators	Sublime Security	22d ago Apr 3rd, 2026	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
Body: Embedded email headers indicative of thread hijacking/abuse	Sublime Security	4mo ago Dec 1st, 2025	Credential Phishing BEC/Fraud Spam Evasion Social engineering Spoofing Content analysis Header analysis Sender analysis
Brand impersonation: Google Drive fake file share	Sublime Security	4mo ago Dec 19th, 2025	Credential Phishing Malware/Ransomware Impersonation: Brand Social engineering Content analysis Header analysis URL analysis Computer Vision
Brand impersonation: Microsoft with low reputation links	Sublime Security	3mo ago Jan 12th, 2026	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
Brand impersonation: Sharepoint	Sublime Security	3mo ago Jan 10th, 2026	Credential Phishing Impersonation: Brand Social engineering Computer Vision Content analysis File analysis Natural Language Understanding Sender analysis
Brand impersonation: Sharepoint fake file share	Sublime Security	3mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Impersonation: Brand Social engineering Content analysis Header analysis URL analysis Computer Vision
Brand impersonation: Wells Fargo	Sublime Security	10d ago Apr 15th, 2026	Credential Phishing Impersonation: Brand Lookalike domain Social engineering Content analysis Sender analysis
Fake message thread - Untrusted sender with a mismatched freemail reply-to address	Sublime Security	3mo ago Jan 12th, 2026	BEC/Fraud Free email provider Social engineering Content analysis Header analysis Sender analysis
Fake thread with suspicious indicators	Sublime Security	3mo ago Jan 12th, 2026	BEC/Fraud Credential Phishing Spam Evasion Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
HTML smuggling with atob in message body	Sublime Security	3mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware HTML smuggling Content analysis HTML analysis
Impersonation: Fake Gmail attachment	Sublime Security	3mo ago Jan 12th, 2026	Credential Phishing Impersonation: Brand Content analysis File analysis Sender analysis
Impersonation: SharePoint reply header anomaly	Sublime Security	3mo ago Jan 12th, 2026	Credential Phishing Social engineering Impersonation: Brand Evasion Spoofing Header analysis Content analysis Sender analysis
Impersonation: Suspected supplier impersonation with suspicious content	Sublime Security	1y 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
Link: Secure SharePoint file share from new or unusual sender	Sublime Security	3mo ago Jan 12th, 2026	Credential Phishing Free file host Evasion Content analysis Sender analysis
Link to Google Apps Script macro via comment tagging	Sublime Security	3mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Social engineering Content analysis Sender analysis URL analysis
Link: Zoho form link from unsolicited sender	Sublime Security	8mo ago Aug 5th, 2025	Callback Phishing Free file host Content analysis URL analysis Sender analysis
Malformed URL prefix	Sublime Security	7mo ago Sep 4th, 2025	Credential Phishing Malware/Ransomware Evasion URL analysis
Reconnaissance: Empty message from uncommon sender	Sublime Security	1mo ago Feb 25th, 2026	Spam Evasion Social engineering Content analysis Header analysis
Service abuse: Google Firebase sender address with suspicious content	Sublime Security	23d ago Apr 2nd, 2026	Spam Credential Phishing Free subdomain host Social engineering Content analysis Header analysis HTML analysis Natural Language Understanding Sender analysis URL analysis Whois
Spam: Attendee list solicitation	Sublime Security	7mo ago Aug 29th, 2025	Spam Content analysis Sender analysis
Spam: Fake photo share	Sublime Security	5mo ago Nov 8th, 2025	Spam Evasion Social engineering Content analysis Sender analysis URL analysis Whois
Spam: New link domain (<=10d) and emojis	Sublime Security	9mo ago Jul 16th, 2025	Spam Free email provider Content analysis Sender analysis URL analysis Whois
Spam: URL shortener with short body content and emojis	Sublime Security	3mo ago Jan 12th, 2026	Spam Free email provider Content analysis Sender analysis URL analysis
Suspicious invoice reference with missing or image-only attachments	Sublime Security	3mo ago Jan 12th, 2026	Credential Phishing Social engineering Content analysis Computer Vision File analysis Natural Language Understanding Sender analysis
Tax Form: W-8BEN solicitation	Sublime Security	2mo ago Feb 23rd, 2026	BEC/Fraud Credential Phishing Social engineering Content analysis Header analysis URL analysis
URL with Unicode U+2044 (⁄) or U+2215 (∕) characters	@delivr_to	3mo ago Jan 12th, 2026	Credential Phishing Evasion Social engineering Content analysis URL analysis
VIP impersonation: Fake thread with display name match, email mismatch	Sublime Security	22d ago Apr 3rd, 2026	BEC/Fraud Evasion Impersonation: VIP Social engineering Spoofing Content analysis Header analysis Sender analysis Whois
VIP impersonation with charitable donation fraud	Sublime Security	5mo ago Nov 12th, 2025	BEC/Fraud Impersonation: Employee Impersonation: VIP Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis

30 Rules