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
Attachment: PDF with fake invoice using suspicious font sizing	Sublime Security	3mo ago Jun 9th, 2026	BEC/Fraud Callback Phishing PDF Social engineering File analysis YARA Content analysis
Attachment: PDF with link to DMG file download	Sublime Security	8mo ago Jan 12th, 2026	Malware/Ransomware Evasion PDF Archive analysis Content analysis File analysis URL analysis
Attachment: PDF with link to zip containing a wsf file	Sublime Security	8mo ago Jan 12th, 2026	Malware/Ransomware Evasion PDF Archive analysis Content analysis File analysis URL analysis
Attachment: PDF with Microsoft Purview message impersonation	Sublime Security	10mo ago Nov 10th, 2025	Credential Phishing Impersonation: Brand PDF Social engineering File analysis Natural Language Understanding Content analysis
Attachment: PDF with password in filename matching body text	Sublime Security	6mo ago Feb 19th, 2026	Malware/Ransomware Credential Phishing Encryption Evasion PDF Content analysis File analysis
Attachment: PDF with personal Microsoft OneNote URL	Sublime Security	9mo ago Dec 4th, 2025	Credential Phishing PDF Social engineering File analysis Content analysis
Attachment: PDF with QR code containing recipient-specific credential theft content	Sublime Security	3mo ago Jun 10th, 2026	Credential Phishing PDF QR code Social engineering File analysis Natural Language Understanding QR code analysis Content analysis
Attachment: PDF with secure document acknowledgment prompt	Sublime Security	1mo ago Jul 17th, 2026	Credential Phishing Evasion PDF Social engineering Image as content Impersonation: Brand Content analysis File analysis YARA
Attachment: PDF with suspicious document view lure	Sublime Security	1mo ago Jul 14th, 2026	Malware/Ransomware PDF Social engineering Content analysis File analysis YARA
Attachment: PDF with suspicious internal object reference identifier	Sublime Security	2mo ago Jun 29th, 2026	BEC/Fraud PDF Content analysis File analysis
Attachment: PDF with suspicious link and action-oriented language	Sublime Security	23d ago Aug 18th, 2026	Credential Phishing PDF Social engineering Evasion File analysis URL analysis Content analysis URL screenshot
Attachment: PDF with View RFP Document lure with external link	Sublime Security	14d ago Aug 27th, 2026	Credential Phishing PDF Social engineering File analysis URL analysis Content analysis
Attachment: PDF with W-9 form indicators	Sublime Security	2mo ago Jun 26th, 2026	BEC/Fraud PDF Social engineering Impersonation: Brand YARA File analysis Content analysis
Attachment: RFP/RFQ impersonating government entities	Sublime Security	2y ago Jan 30th, 2024	BEC/Fraud Impersonation: Brand PDF Social engineering Content analysis File analysis Natural Language Understanding Optical Character Recognition Sender analysis
Attachment: Romance scam with image lure and advance-fee or suspicious link indicators	Sublime Security	2mo ago Jul 1st, 2026	BEC/Fraud Spam Social engineering Image as content Free email provider Free file host Out of band pivot Natural Language Understanding Header analysis Sender analysis Content analysis URL analysis File analysis
Attachment: Self-sender PDF with minimal content and view prompt	Sublime Security	6mo ago Feb 12th, 2026	Credential Phishing Malware/Ransomware PDF Social engineering Evasion Content analysis File analysis Sender analysis
Attachment: Suspicious employee policy update document lure	Sublime Security	8mo ago Dec 26th, 2025	Credential Phishing PDF Social engineering Evasion Content analysis File analysis Sender analysis
Attachment: Suspicious PDF created with headless browser	Sublime Security	2mo ago Jul 1st, 2026	Credential Phishing Evasion PDF Content analysis Exif analysis File analysis Optical Character Recognition
Attachment: SVG file execution	Sublime Security	1y ago Aug 8th, 2025	Malware/Ransomware Scripting Archive analysis Content analysis File analysis
Attachment: SVG file with HTML entity encoded href attributes	Sublime Security	3mo ago May 20th, 2026	Malware/Ransomware Credential Phishing Evasion HTML smuggling File analysis Content analysis
Attachment: SVG file with hyperlinks and cursor styling	Sublime Security	3mo ago May 20th, 2026	Credential Phishing Evasion Image as content File analysis XML analysis Content analysis
Attachment: Targeted DOCX with personalized recipient acknowledgement lure	Sublime Security	1mo ago Aug 4th, 2026	Credential Phishing Social engineering Archive analysis Content analysis File analysis XML analysis
Attachment: USDA bid invitation impersonation	Sublime Security	1y ago Aug 5th, 2025	BEC/Fraud Impersonation: Brand PDF Macros Social engineering Content analysis File analysis Header analysis Natural Language Understanding Optical Character Recognition Sender analysis
Attachment: Web files with suspicious comments	Sublime Security	1y ago Aug 8th, 2025	Credential Phishing Malware/Ransomware HTML smuggling Evasion File analysis HTML analysis Content analysis
BEC: Employee impersonation with subject manipulation	Sublime Security	7mo ago Jan 16th, 2026	BEC/Fraud Impersonation: Employee Social engineering Content analysis Natural Language Understanding Sender analysis
BEC: Executive coaching vendor impersonation	Sublime Security	2mo ago Jul 1st, 2026	BEC/Fraud Impersonation: Brand Social engineering Content analysis HTML analysis Natural Language Understanding
BEC: Financial fraud from newly registered sender domain	Sublime Security	2mo ago Jun 25th, 2026	BEC/Fraud Social engineering Spoofing Natural Language Understanding Whois Content analysis Sender analysis Header analysis
BEC/Fraud: Fake investment outreach from suspicious TLD	Sublime Security	30d ago Aug 11th, 2026	BEC/Fraud Social engineering Header analysis Sender analysis Content analysis Natural Language Understanding
BEC/Fraud: Generic scam attempt to undisclosed recipients	Sublime Security	1mo ago Jul 27th, 2026	BEC/Fraud Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
BEC/Fraud: Job scam fake thread or plaintext pivot to freemail	Sublime Security	3mo ago Jun 5th, 2026	BEC/Fraud Free email provider Out of band pivot Content analysis File analysis Natural Language Understanding
BEC/Fraud: Penpal scam	Sublime Security	1mo ago Jul 27th, 2026	BEC/Fraud Free email provider Social engineering Content analysis Header analysis Sender analysis
BEC/Fraud: Reply-chain manipulation with urgent keywords and self-reply	Sublime Security	6mo ago Mar 11th, 2026	BEC/Fraud Social engineering Evasion Content analysis Header analysis Sender analysis
BEC/Fraud: Romance scam	Sublime Security	6mo ago Mar 9th, 2026	BEC/Fraud Free email provider Social engineering Content analysis Header analysis
BEC/Fraud: Scam lure with freemail pivot	Sublime Security	4mo ago Apr 30th, 2026	BEC/Fraud Free email provider Out of band pivot Content analysis Header analysis Sender analysis
BEC/Fraud: Self-addressed reply with unrelated link in ongoing thread	Sublime Security	15d ago Aug 26th, 2026	BEC/Fraud Credential Phishing Social engineering Out of band pivot URL analysis Header analysis Sender analysis Content analysis
BEC/Fraud: Student loan callback phishing	Sublime Security	4mo ago May 4th, 2026	BEC/Fraud Free email provider Out of band pivot Social engineering Content analysis Natural Language Understanding Sender analysis
BEC/Fraud: Unsolicited business acquisition offer	Sublime Security	2mo ago Jul 6th, 2026	BEC/Fraud Social engineering Content analysis
BEC/Fraud: Urgent language and suspicious sending/infrastructure patterns	Sublime Security	4mo ago Apr 17th, 2026	BEC/Fraud Callback Phishing Spam Impersonation: Brand Social engineering Free email provider Content analysis Header analysis Sender analysis Whois
BEC: Tax document request	Sublime Security	1mo ago Aug 6th, 2026	BEC/Fraud Social engineering Spoofing Content analysis Header analysis Natural Language Understanding Sender analysis
BEC: Wealth management lure from newly registered domain	Sublime Security	2d ago Sep 8th, 2026	BEC/Fraud Social engineering Whois Content analysis Natural Language Understanding
BEC with unusual reply-to or return-path mismatch	Sublime Security	3mo ago Jun 5th, 2026	BEC/Fraud Evasion Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
Benefits enrollment impersonation	Sublime Security	3mo ago Jun 5th, 2026	Credential Phishing Evasion Impersonation: Employee Out of band pivot Social engineering Content analysis Header analysis Sender analysis
Body: CSS clamp() font obfuscation	Sublime Security	9d ago Sep 1st, 2026	Credential Phishing Evasion Social engineering HTML analysis URL analysis Content analysis
Body: CSS Hidden text via clip-path	Sublime Security	1mo ago Aug 5th, 2026	Spam Credential Phishing Evasion HTML analysis Content analysis
Body: CSS Hidden text via table-column	Sublime Security	7d ago Sep 3rd, 2026	Credential Phishing Spam Evasion HTML analysis Content analysis
Body: CVE-2026-42897 Exchange OWA stored XSS	Sublime Security	10h ago Sep 9th, 2026	Malware/Ransomware Evasion Exploit Scripting Content analysis HTML analysis
Body: Embedded email headers indicative of thread hijacking/abuse	Sublime Security	9mo ago Dec 1st, 2025	Credential Phishing BEC/Fraud Spam Evasion Social engineering Spoofing Content analysis Header analysis Sender analysis
Body: Fake secure email portal with HTML obfuscation	Sublime Security	2mo ago Jun 18th, 2026	Credential Phishing Evasion Social engineering Spoofing Content analysis HTML analysis URL analysis Sender analysis Threat intelligence
Body HTML: Comment with 24-character hex token	Sublime Security	9d ago Sep 1st, 2026	Spam Evasion Content analysis HTML analysis
Body: HTML whitespace stuffing with short initial message	Sublime Security	13d ago Aug 28th, 2026	Credential Phishing Evasion Social engineering Content analysis HTML analysis Header analysis

675 Rules

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