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 Mar 27th, 2026

Feed Source

GitHub

Tactic or Technique is

Rule Name & Severity	Author	Last Updated	Labels
Attachment: Calendar invite with suspicious link leading to an open redirect	Sublime Security	8mo ago Jul 16th, 2025	Spam Free email provider Free file host Free subdomain host Open redirect Content analysis URL analysis
Attachment: Callback phishing solicitation via image file	@vector_sec	2mo ago Jan 12th, 2026	Callback Phishing Evasion Free email provider Out of band pivot Social engineering Image as content Content analysis Optical Character Recognition Sender analysis URL analysis Computer Vision
Attachment: Callback phishing solicitation via pdf file	Sublime Security	7mo 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: PDF file with link to fake Bitcoin exchange	Sublime Security	2mo ago Jan 12th, 2026	BEC/Fraud Free email provider Impersonation: Brand PDF Social engineering Exif analysis File analysis Sender analysis URL analysis
BEC/Fraud: Job scam fake thread or plaintext pivot to freemail	Sublime Security	2mo ago Jan 12th, 2026	BEC/Fraud Free email provider Out of band pivot Content analysis File analysis Natural Language Understanding
BEC/Fraud: Penpal scam	Sublime Security	7mo ago Aug 5th, 2025	BEC/Fraud Free email provider Social engineering Content analysis Header analysis Sender analysis
BEC/Fraud: Romance scam	Sublime Security	21d ago Mar 9th, 2026	BEC/Fraud Free email provider Social engineering Content analysis Header analysis
BEC/Fraud: Scam lure with freemail pivot	Sublime Security	7mo ago Aug 5th, 2025	BEC/Fraud Free email provider Out of band pivot Content analysis Header analysis Sender analysis
BEC/Fraud: Student loan callback phishing	Sublime Security	6mo ago Sep 5th, 2025	BEC/Fraud Free email provider Out of band pivot Social engineering Content analysis Natural Language Understanding Sender analysis
BEC/Fraud: Urgent language and suspicious sending/infrastructure patterns	Sublime Security	2mo ago Jan 12th, 2026	BEC/Fraud Callback Phishing Spam Impersonation: Brand Social engineering Free email provider Content analysis Header analysis Sender analysis Whois
BEC with unusual reply-to or return-path mismatch	Sublime Security	27d ago Mar 3rd, 2026	BEC/Fraud Evasion Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
Brand impersonation: Hulu	Sublime Security	2mo ago Jan 12th, 2026	Credential Phishing Spam Free email provider Impersonation: Brand Lookalike domain Social engineering Computer Vision Header analysis Sender analysis
Brand impersonation: KnowBe4	Sublime Security	2y ago Nov 25th, 2024	Credential Phishing Spam Free email provider Impersonation: Brand Lookalike domain Social engineering Computer Vision Header analysis Sender analysis
Brand impersonation: Norton	Sublime Security	2mo ago Jan 12th, 2026	Credential Phishing Free email provider Impersonation: Brand Social engineering Content analysis File analysis Header analysis Sender analysis
Brand impersonation: SiriusXM	Sublime Security	7mo ago Aug 5th, 2025	Callback Phishing Credential Phishing Spam Free email provider Impersonation: Brand Social engineering Content analysis Header analysis Sender analysis
Brand impersonation: Zoom via lookalike domain	Sublime Security	24d ago Mar 6th, 2026	Credential Phishing Impersonation: Brand Free email provider Social engineering URL analysis Sender analysis
Business Email Compromise (BEC) attempt with masked recipients and reply-to mismatch (unsolicited)	Sublime Security	8mo ago Jul 16th, 2025	BEC/Fraud Evasion Free email provider Header analysis Sender analysis
Callback phishing: AOL senders with suspicious HTML template or PDF attachment	Sublime Security	2mo ago Jan 12th, 2026	Callback Phishing Free email provider Social engineering Content analysis Header analysis File analysis HTML analysis Exif analysis Sender analysis
Callback phishing: Social Security Administration fraud	Sublime Security	2mo ago Jan 12th, 2026	Callback Phishing Evasion Free email provider Out of band pivot PDF Social engineering Exif analysis File analysis Optical Character Recognition Sender analysis
Callback phishing solicitation in message body	Sublime Security	5mo ago Oct 17th, 2025	Callback Phishing Free email provider Impersonation: Brand Out of band pivot Social engineering File analysis Sender analysis
Callback phishing via e-signature service	Sublime Security	2mo ago Jan 12th, 2026	Callback Phishing Free email provider Impersonation: Brand Social engineering Content analysis Computer Vision Header analysis Optical Character Recognition
Callback phishing via Google Group abuse	Sublime Security	8mo ago Jul 16th, 2025	Callback Phishing Free email provider Impersonation: Brand Social engineering File analysis Natural Language Understanding Optical Character Recognition Sender analysis
Callback phishing via Intuit service abuse	Sublime Security	2mo ago Jan 12th, 2026	Callback Phishing Evasion Free email provider Impersonation: Brand Social engineering Computer Vision Content analysis Header analysis Optical Character Recognition
Callback phishing via Zoho service abuse	Sublime Security	2mo ago Jan 12th, 2026	Callback Phishing Evasion Free email provider Impersonation: Brand Social engineering Computer Vision Content analysis Header analysis Optical Character Recognition
Canva infrastructure abuse	Sublime Security	1mo ago Feb 6th, 2026	BEC/Fraud Callback Phishing Social engineering Impersonation: Brand Impersonation: Employee Free email provider Natural Language Understanding Sender analysis Content analysis
ClickFunnels link infrastructure abuse	Sublime Security	1mo ago Feb 5th, 2026	Credential Phishing Free email provider Free subdomain host Social engineering Content analysis Header analysis QR code analysis Sender analysis URL analysis
Constant Contact link infrastructure abuse	Sublime Security	5mo ago Oct 17th, 2025	Credential Phishing Free email provider Open redirect Social engineering Content analysis Header analysis QR code analysis Sender analysis
COVID-19 themed fraud with sender and reply-to mismatch or compensation award	Sublime Security	2mo ago Jan 12th, 2026	BEC/Fraud Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
Credential phishing: Engaging language and other indicators (untrusted sender)	Sublime Security	2mo ago Jan 12th, 2026	Credential Phishing Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis
Credential phishing language and suspicious indicators (unknown sender)	Sublime Security	8mo ago Jul 16th, 2025	Credential Phishing Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis
Domain impersonation: Freemail reply-to local lookalike with financial request	Sublime Security	2mo ago Jan 12th, 2026	Credential Phishing Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
Employee impersonation: Payroll fraud	Sublime Security	7mo ago Aug 5th, 2025	BEC/Fraud Impersonation: Employee Free email provider Social engineering Content analysis 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
Fake message thread - Untrusted sender with a mismatched freemail reply-to address	Sublime Security	2mo ago Jan 12th, 2026	BEC/Fraud Free email provider Social engineering Content analysis Header analysis Sender analysis
Free email provider sender with mismatched provider reply-to	Sublime Security	7mo ago Aug 5th, 2025	BEC/Fraud Credential Phishing Free email provider Social engineering Header analysis Sender analysis
Google services using g.co shortlinks	Sublime Security	2mo ago Jan 12th, 2026	Credential Phishing Evasion Free email provider Content analysis Header analysis Sender analysis URL analysis
Honorific greeting BEC attempt with sender and reply-to mismatch	Sublime Security	2mo ago Jan 12th, 2026	BEC/Fraud Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
Impersonation: Chrome Web Store policy	Sublime Security	7mo ago Aug 5th, 2025	Credential Phishing Impersonation: Brand Free email provider Lookalike domain Content analysis Header analysis HTML analysis Sender analysis URL analysis
Impersonation: Executive using numbered local part	Sublime Security	1mo ago Jan 30th, 2026	BEC/Fraud Free email provider Impersonation: VIP Social engineering Header 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 abuse: Self-service creation platform link with suspicious recipient behavior	Sublime Security	3mo ago Dec 2nd, 2025	BEC/Fraud Credential Phishing Spam Free email provider Social engineering Header analysis Sender analysis URL analysis
Link: Apple App Store malicious ad manager themed apps from free email provider	Sublime Security	2mo ago Jan 12th, 2026	Credential Phishing BEC/Fraud Malware/Ransomware Free email provider Social engineering Evasion Content analysis Sender analysis URL analysis
Link: Apple TestFlight from free email provider	Sublime Security	5mo ago Oct 17th, 2025	Credential Phishing Free email provider Evasion Sender analysis URL analysis
Link: Google Calendar invite linking to an open redirect from an untrusted freemail sender	Sublime Security	8mo ago Jul 16th, 2025	Spam Free email provider Free file host Open redirect Social engineering Content analysis Sender analysis URL analysis
Link: Invoice or receipt from freemail sender with customer service number	@vector_sec	2mo ago Jan 12th, 2026	BEC/Fraud Callback Phishing Free email provider Impersonation: Brand Social engineering Content analysis Sender analysis URL analysis
Link: Multistage landing - Abused Google Drive	Sublime Security	7mo ago Aug 5th, 2025	Credential Phishing Evasion Free email provider Free file host Content analysis Sender analysis URL analysis Whois HTML analysis
Link: PDF and financial display text to free file host	Sublime Security	6mo ago Sep 24th, 2025	Credential Phishing Free file host Free email provider Social engineering Content analysis Sender analysis URL analysis
Mass campaign: Cross Site Scripting (XSS) attempt	Sublime Security	8mo ago Jul 16th, 2025	Malware/Ransomware Spam Exploit Free email provider Scripting Social engineering Content analysis Header analysis Sender analysis
Message traversed multiple onmicrosoft.com tenants	Sublime Security	2mo ago Jan 12th, 2026	Callback Phishing Evasion Free email provider Free subdomain host Sender analysis Header analysis
Reconnaissance: Email address harvesting attempt	Sublime Security	1mo ago Feb 23rd, 2026	BEC/Fraud Credential Phishing Spam Free email provider Social engineering Content analysis Header analysis Sender analysis URL analysis

71 Rules

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