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

Detection Method is

Rule Name & Severity	Author	Last Updated	Labels
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
Encrypted Microsoft Office files from untrusted sender	Sublime Security	1y ago Aug 5th, 2025	BEC/Fraud Callback Phishing Credential Phishing Extortion Malware/Ransomware Spam Encryption Evasion File analysis YARA Sender analysis
Evasion: Hidden content divs from freemail sender	Sublime Security	2mo ago Jun 17th, 2026	Credential Phishing Evasion Free email provider HTML analysis Content analysis Sender 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 (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 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 from suspicious sender domain	Sublime Security	6mo ago Feb 13th, 2026	Credential Phishing Malware/Ransomware Free file host 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 Accelerated Mobile Pages (AMP) abuse	Sublime Security	8mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Impersonation: Brand Open redirect Computer Vision Content analysis Natural Language Understanding Optical Character Recognition Sender analysis URL analysis URL screenshot
Google Drive abuse: Credential phishing link	Sublime Security	2y ago Jul 31st, 2024	Credential Phishing Free file host Impersonation: Brand Computer Vision Natural Language Understanding Optical Character Recognition Sender analysis URL analysis URL screenshot
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 services using g.co shortlinks	Sublime Security	8mo ago Jan 12th, 2026	Credential Phishing Evasion Free email provider Content analysis Header analysis Sender analysis URL analysis
Google share notification with suspicious comments	Sublime Security	8mo ago Jan 12th, 2026	Credential Phishing Impersonation: VIP Free file host HTML analysis Header analysis Sender analysis Content 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: Self-sender using Microsoft CompAuth bypass with credential theft content	Sublime Security	4mo ago Apr 27th, 2026	Credential Phishing Spoofing Evasion Natural Language Understanding 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
HR impersonation via e-sign agreement comment	Sublime Security	3mo ago Jun 5th, 2026	BEC/Fraud Credential Phishing Evasion Impersonation: Brand Out of band pivot Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
HTML smuggling containing recipient email address	Sublime Security	10mo ago Nov 4th, 2025	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis File analysis Sender analysis
Impersonation: Australian Federal Police with criminal case language	Sublime Security	3mo ago Jun 4th, 2026	BEC/Fraud Extortion Impersonation: Brand Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
Impersonation: Chrome Web Store policy	Sublime Security	1y ago Aug 5th, 2025	Credential Phishing Impersonation: Brand Free email provider Lookalike domain Content analysis Header analysis HTML analysis Sender analysis URL analysis
Impersonation: Employee name in subject with suspicious sender	Sublime Security	2mo ago Jul 10th, 2026	BEC/Fraud Impersonation: Employee Impersonation: VIP Free email provider Social engineering Spoofing Sender analysis Content analysis
Impersonation: Employee using fabricated identity in initial contact	Sublime Security	3mo ago May 28th, 2026	BEC/Fraud Impersonation: Employee Social engineering Content analysis Sender analysis
Impersonation: Executive using numbered local part	Sublime Security	7mo ago Jan 30th, 2026	BEC/Fraud Free email provider Impersonation: VIP Social engineering Header analysis Sender analysis
Impersonation: Fake Gmail attachment	Sublime Security	8mo ago Jan 12th, 2026	Credential Phishing Impersonation: Brand Content analysis File analysis Sender analysis
Impersonation: HR administrative center PDF password lure	Sublime Security	13d ago Aug 28th, 2026	Credential Phishing Impersonation: Brand PDF Social engineering Evasion Content analysis Header analysis Sender analysis
Impersonation: Human Resources with link or attachment and engaging language	Sublime Security	3mo ago Jun 5th, 2026	BEC/Fraud Credential Phishing Impersonation: Employee Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
Impersonation: Internal corporate services	Sublime Security	1mo ago Jul 22nd, 2026	Credential Phishing Impersonation: Employee Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
Impersonation: Legal firm with copyright infringement notice	Sublime Security	2mo ago Jun 24th, 2026	BEC/Fraud Extortion Impersonation: Brand Social engineering Content analysis Header analysis Sender analysis
Impersonation: Recipient organization in sender display name with credential theft image	Sublime Security	6mo ago Feb 17th, 2026	Credential Phishing Image as content Impersonation: Brand Social engineering Computer Vision Content analysis File analysis Natural Language Understanding Optical Character Recognition Sender analysis

753 Rules

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