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 Sep 9th, 2026

Feed Source

GitHub

Tactic or Technique is

Rule Name & Severity	Author	Last Updated	Labels
Credential phishing: Personalized document signing request	Sublime Security	1mo ago Jul 27th, 2026	Credential Phishing BEC/Fraud Impersonation: Brand Social engineering Content analysis HTML analysis
Credential phishing: Re-Authentication lure	Sublime Security	10mo ago Oct 17th, 2025	Credential Phishing Social engineering Impersonation: Brand Natural Language Understanding Content analysis URL analysis Header analysis Sender analysis
Credential phishing: 'Secure message' and engaging language	Sublime Security	1mo ago Jul 17th, 2026	Credential Phishing Social engineering Natural Language Understanding Sender analysis
Credential phishing: Suspicious e-sign agreement document notification	Sublime Security	6d ago Sep 4th, 2026	Credential Phishing Social engineering Content analysis Header analysis HTML analysis URL analysis Sender analysis
Credential phishing: Suspicious subject with urgent financial request and link	Sublime Security	3mo ago Jun 5th, 2026	Credential Phishing Impersonation: Brand Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
Credential phishing: Tax form impersonation with payment request	Sublime Security	6mo ago Feb 13th, 2026	BEC/Fraud Credential Phishing Impersonation: Brand Social engineering PDF Content analysis Header analysis Sender analysis URL analysis
Credential Phishing via Dropbox comment abuse	Sublime Security	11mo ago Sep 22nd, 2025	Credential Phishing Evasion Out of band pivot Social engineering Content analysis Computer Vision Sender analysis
Credential Phishing: W-2 lure with inline SVG Windows logo	Sublime Security	5mo ago Apr 8th, 2026	Credential Phishing Evasion HTML smuggling Social engineering Content analysis HTML analysis
Credential theft: JavaScript date manipulation in HTML body	Sublime Security	1mo ago Jul 28th, 2026	Credential Phishing Evasion Scripting Social engineering HTML analysis Javascript analysis Natural Language Understanding
Credential theft with 'safe content' deception and social engineering topics	Sublime Security	22d ago Aug 19th, 2026	Credential Phishing Social engineering Evasion Content analysis Natural Language Understanding
Cyrillic vowel substitution in subject or display name from unknown sender	Sublime Security	1y ago Jul 16th, 2025	Credential Phishing Evasion Social engineering Spoofing Content analysis Header analysis Sender analysis
Cyrillic vowel substitutions with suspicious subject from unknown sender	Sublime Security	1mo ago Jul 17th, 2026	Credential Phishing Evasion Impersonation: Brand Social engineering Content analysis Sender analysis
Deceptive Dropbox mention	Sublime Security	8mo ago Jan 12th, 2026	Credential Phishing Impersonation: Brand Free file host Free subdomain host Social engineering Header analysis Content analysis Natural Language Understanding Sender analysis URL analysis
Display name and subject impersonation using recipient SLD (new sender)	Sublime Security	1y ago Jul 16th, 2025	Credential Phishing Social engineering Header analysis Sender analysis
Display Name Emoji with Financial Symbols	Sublime Security	8mo ago Jan 12th, 2026	BEC/Fraud Callback Phishing Social engineering Evasion Content analysis Header analysis Sender analysis
Display name impersonation using recipient SLD	Sublime Security	8mo ago Jan 12th, 2026	Credential Phishing Social engineering Header analysis Sender analysis
Domain impersonation: Freemail reply-to local lookalike with financial request	Sublime Security	8mo ago Jan 12th, 2026	Credential Phishing Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
EML attachment with credential theft language (unknown sender)	Sublime Security	5mo ago Mar 17th, 2026	Credential Phishing Evasion Social engineering Natural Language Understanding Sender analysis Content analysis Header analysis
Employee impersonation: Payroll fraud	Sublime Security	2mo ago Jun 18th, 2026	BEC/Fraud Impersonation: Employee Free email provider Social engineering Content analysis Sender analysis
Employee impersonation with urgent request (untrusted sender)	Sublime Security	8mo ago Jan 12th, 2026	BEC/Fraud Impersonation: Employee Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
Evasion: Hidden text using CSS-obscured HTML option labels	Sublime Security	9d ago Sep 1st, 2026	Credential Phishing Evasion Social engineering Impersonation: Brand HTML analysis URL analysis Content analysis
Extortion / sextortion in attachment from untrusted sender	Sublime Security	1mo ago Aug 6th, 2026	Extortion Social engineering Spoofing Computer Vision Content analysis File analysis Natural Language Understanding Optical Character Recognition Sender analysis
Extortion / Sextortion - PDF attachment leveraging breach data from freemail sender	Sublime Security	1y ago Feb 3rd, 2025	BEC/Fraud Free email provider PDF Social engineering QR code Content analysis File analysis QR code analysis
Extortion / sextortion (untrusted sender)	Sublime Security	30d ago Aug 11th, 2026	Extortion Social engineering Spoofing Content analysis Header analysis Natural Language Understanding Sender analysis
Fake email quarantine notification	Sublime Security	22d ago Aug 19th, 2026	Credential Phishing Social engineering Content analysis Natural Language Understanding Sender analysis
Fake message thread - Untrusted sender with a mismatched freemail reply-to address	Sublime Security	8mo ago Jan 12th, 2026	BEC/Fraud Free email provider Social engineering Content analysis Header analysis Sender analysis
Fake message thread with a suspicious link and engaging language from an unknown sender	Sublime Security	3mo ago Jun 5th, 2026	Credential Phishing Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis
Fake request for tax preparation	Sublime Security	8mo ago Jan 12th, 2026	BEC/Fraud Malware/Ransomware Social engineering Content analysis Natural Language Understanding Sender analysis
Fake scan-to-email message	Sublime Security	8mo ago Jan 12th, 2026	Credential Phishing Free file host Social engineering Content analysis Optical Character Recognition Sender analysis URL analysis
Fake shipping notification with link to free file hosting	Sublime Security	2y ago Jul 10th, 2024	Spam Free file host Impersonation: Brand Social engineering Content analysis Header analysis Sender analysis
Fake thread with suspicious indicators	Sublime Security	2mo ago Jun 17th, 2026	BEC/Fraud Credential Phishing Spam Evasion Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
Fake voicemail notification (untrusted sender)	Sublime Security	2mo ago Jun 25th, 2026	Credential Phishing Social engineering Content analysis Natural Language Understanding Sender analysis URL analysis
Fake warning banner using confusable characters	Sublime Security	6mo ago Mar 2nd, 2026	BEC/Fraud Credential Phishing Evasion Social engineering Content analysis
Fake Zoho Sign template abuse	Sublime Security	8mo ago Jan 12th, 2026	Credential Phishing Evasion Open redirect Social engineering Content analysis HTML analysis URL analysis
Fake Zoom meeting invite with suspicious link	Sublime Security	2mo ago Jun 16th, 2026	Credential Phishing Impersonation: Brand Evasion Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis
File sharing link with a suspicious subject	Sublime Security	6mo ago Feb 17th, 2026	BEC/Fraud Free file host Social engineering Header analysis Sender analysis URL analysis
Fraudulent e-commerce operators	Sublime Security	1y ago Aug 5th, 2025	BEC/Fraud Impersonation: Brand Lookalike domain Social engineering Content analysis Header analysis Sender analysis
Fraudulent order confirmation/shipping notification from Chinese sender domain	Sublime Security	8mo ago Jan 12th, 2026	BEC/Fraud Social engineering Content analysis Natural Language Understanding Sender analysis Whois
Free email provider sender with mismatched provider reply-to	Sublime Security	1y ago Aug 5th, 2025	BEC/Fraud Credential Phishing Free email provider Social engineering Header analysis Sender analysis
Free subdomain link with login or captcha (untrusted sender)	Sublime Security	8mo ago Jan 12th, 2026	Credential Phishing Free subdomain host Social engineering Computer Vision File analysis Sender analysis URL screenshot
Generic service abuse from newly registered domain	Sublime Security	1y ago Aug 5th, 2025	BEC/Fraud Callback Phishing Credential Phishing Evasion Social engineering Header analysis Sender analysis Whois
Google Drive direct download link from unsolicited sender	Sublime Security	1y ago Jul 16th, 2025	Malware/Ransomware Credential Phishing Evasion Social engineering Free file host URL analysis Sender analysis Content analysis
Google Notification alert link from non-Google sender	Sublime Security	8mo ago Jan 12th, 2026	Credential Phishing Social engineering Content analysis Header analysis Sender analysis URL analysis
Google presentation open redirect phishing	Sublime Security	9mo ago Dec 11th, 2025	Credential Phishing Evasion Open redirect Social engineering URL analysis HTML analysis
Hardbacon infrastructure abuse	Sublime Security	2y ago Dec 20th, 2024	Credential Phishing Evasion Impersonation: Brand Social engineering Header analysis Sender analysis
Headers: Fake in-reply-to with wildcard sender and missing thread context	Sublime Security	7mo ago Jan 23rd, 2026	BEC/Fraud Credential Phishing Evasion Social engineering Spoofing Header analysis Sender analysis Content analysis
Headers: Invalid recipient domain with mismatched reply-to from new sender	Sublime Security	9mo ago Nov 21st, 2025	BEC/Fraud Credential Phishing Spam Evasion Social engineering Header analysis Sender analysis
Headers: System account impersonation with empty sender address	Sublime Security	8mo ago Jan 12th, 2026	BEC/Fraud Credential Phishing Impersonation: Employee Social engineering Spoofing Header analysis Sender analysis Natural Language Understanding
Headers: X-Source-Auth mismatch with mismatched reply-to domain	Sublime Security	3mo ago May 21st, 2026	BEC/Fraud Social engineering Spoofing Content analysis Header analysis Natural Language Understanding Sender analysis
Honorific greeting BEC attempt with sender and reply-to mismatch	Sublime Security	1mo ago Jul 27th, 2026	BEC/Fraud Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis

764 Rules

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