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 Oct 23rd, 2026

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Tactic or Technique is

Rule Name & Severity	Author	Last Updated	Labels
Attachment: Filename containing Unicode braille pattern blank character	@vector_sec	1y ago Aug 5th, 2025	Malware/Ransomware Evasion Archive analysis File analysis
Attachment: Filename containing Unicode right-to-left override character	@vector_sec	9mo ago Jan 12th, 2026	Malware/Ransomware Evasion Archive analysis File analysis
Attachment: Finance themed PDF with observed phishing template	Sublime Security	7mo ago Mar 2nd, 2026	Credential Phishing PDF Evasion File analysis Content analysis
Attachment: GZ archive with credential theft content	Sublime Security	1mo ago Sep 2nd, 2026	Credential Phishing Evasion Archive analysis File analysis YARA Natural Language Understanding HTML analysis URL analysis
Attachment: Gzip-archived with nested HTML file containing image and button link	Sublime Security	1mo ago Sep 3rd, 2026	Credential Phishing HTML smuggling Image as content Evasion Archive analysis YARA HTML analysis URL analysis File analysis
Attachment: Hex-encoded recipient email in URL fragment	Sublime Security	1mo ago Sep 16th, 2026	Credential Phishing BEC/Fraud Social engineering Evasion PDF File analysis URL analysis Content analysis
Attachment: HTML attachment with Javascript location	@vector_sec	1y ago Aug 5th, 2025	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis Javascript analysis HTML analysis
Attachment: HTML file contains exclusively Javascript	Sublime Security	9mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis File analysis
Attachment: HTML file with excessive 'const' declarations and abnormally long timeouts	Sublime Security	11mo ago Nov 3rd, 2025	Malware/Ransomware Credential Phishing HTML smuggling Scripting Evasion HTML analysis File analysis Content analysis
Attachment: HTML file with excessive padding and suspicious patterns	Sublime Security	9mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Evasion HTML smuggling File analysis HTML analysis YARA
Attachment: HTML smuggling 'body onload' linking to suspicious destination	Sublime Security	9mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis HTML analysis URL analysis
Attachment: HTML smuggling 'body onload' with high entropy and suspicious text	Sublime Security	9mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis HTML analysis
Attachment: HTML smuggling with atob and high entropy via calendar invite	Sublime Security	1mo ago Sep 23rd, 2026	Credential Phishing Malware/Ransomware Evasion HTML smuggling ICS Phishing Scripting File analysis HTML analysis Javascript analysis Sender analysis
Attachment: HTML smuggling with base64 encoded ZIP file	Sublime Security	11mo ago Nov 20th, 2025	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis HTML analysis Javascript analysis
Attachment: HTML smuggling with concatenation obfuscation	@vector_sec	9mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis HTML analysis
Attachment: HTML smuggling with decimal encoding	Sublime Security	1mo ago Sep 23rd, 2026	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis HTML analysis
Attachment: HTML smuggling with dynamically constructed redirect URL	Sublime Security	26d ago Sep 29th, 2026	Credential Phishing HTML smuggling Evasion Impersonation: Brand Social engineering Scripting HTML analysis Javascript analysis File analysis
Attachment: HTML smuggling with embedded base64-encoded executable	Sublime Security	2y ago Mar 25th, 2024	Malware/Ransomware Evasion HTML smuggling Archive analysis File analysis HTML analysis YARA
Attachment: HTML smuggling with embedded base64-encoded ISO	Sublime Security	3y ago Aug 21st, 2023	Credential Phishing Malware/Ransomware Evasion HTML smuggling ISO Archive analysis Content analysis File analysis HTML analysis Sender analysis
Attachment: HTML smuggling with eval and atob	Sublime Security	9mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis HTML analysis Javascript analysis
Attachment: HTML smuggling with eval and atob via calendar invite	Sublime Security	5mo ago Apr 28th, 2026	Credential Phishing Malware/Ransomware Evasion HTML smuggling ICS Phishing Scripting File analysis HTML analysis Javascript analysis
Attachment: HTML smuggling with excessive line break obfuscation	Sublime Security	9mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Encryption Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis HTML analysis Javascript analysis
Attachment: HTML smuggling with excessive string concatenation and suspicious patterns	Sublime Security	2y ago Aug 27th, 2024	Credential Phishing Evasion HTML smuggling Scripting Social engineering File analysis HTML analysis Javascript analysis
Attachment: HTML smuggling with fromCharCode and other signals	Sublime Security	3y ago Aug 21st, 2023	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis Javascript analysis HTML analysis
Attachment: HTML smuggling with hex strings	@ajpc500	3y ago Aug 21st, 2023	Credential Phishing Malware/Ransomware Evasion HTML smuggling Archive analysis Content analysis File analysis HTML analysis Javascript analysis
Attachment: HTML smuggling with high entropy and other signals	Sublime Security	3y ago Aug 21st, 2023	Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis HTML analysis
Attachment: HTML smuggling with raw array buffer	Sublime Security	3y ago Aug 21st, 2023	Credential Phishing Malware/Ransomware Evasion Free subdomain host HTML smuggling Archive analysis Content analysis File analysis Javascript analysis
Attachment: HTML smuggling with RC4 decryption	Sublime Security	9mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Encryption Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis HTML analysis Javascript analysis
Attachment: HTML smuggling with ROT13	@Kyle_Parrish_	9mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Encryption Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis Javascript analysis HTML analysis
Attachment: HTML smuggling with setTimeout	Sublime Security	9mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis HTML analysis Javascript analysis
Attachment: HTML smuggling with unescape	Sublime Security	9mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis File analysis HTML analysis Javascript analysis
Attachment: HTML with emoji-to-character map	Sublime Security	1mo ago Sep 23rd, 2026	Credential Phishing Evasion HTML smuggling Impersonation: Brand Scripting Social engineering File analysis HTML analysis Javascript analysis Sender analysis
Attachment: HTML with hidden body	Sublime Security	1mo ago Sep 23rd, 2026	Credential Phishing Evasion Scripting Content analysis HTML analysis File analysis
Attachment: HTML with JavaScript functions for HTTP requests	Sublime Security	1mo ago Sep 23rd, 2026	Credential Phishing Evasion Scripting Content analysis HTML analysis Javascript analysis File analysis
Attachment: ICS calendar file with base64 encoded recipient address in URL parameters	Sublime Security	5mo ago May 12th, 2026	Credential Phishing Evasion Social engineering ICS Phishing File analysis URL analysis Content analysis
Attachment: ICS calendar file with legal language	Sublime Security	27d ago Sep 28th, 2026	BEC/Fraud Social engineering Evasion ICS Phishing File analysis Content analysis URL analysis
Attachment: ICS calendar file with QR code containing recipient email address	Sublime Security	1mo ago Sep 22nd, 2026	Credential Phishing QR code Social engineering Evasion File analysis QR code analysis URL analysis Content analysis
Attachment: ICS calendar file with real estate fraud link	Sublime Security	1mo ago Sep 18th, 2026	BEC/Fraud Social engineering Evasion File analysis Content analysis URL analysis
Attachment: ICS calendar file with suspicious product identifier	Sublime Security	2mo ago Jul 27th, 2026	Credential Phishing Evasion Social engineering ICS Phishing File analysis Content analysis
Attachment: ICS calendar invite hiding credential theft	Sublime Security	27d ago Sep 28th, 2026	Credential Phishing Social engineering Evasion ICS Phishing File analysis Content analysis Natural Language Understanding Header analysis Sender analysis
Attachment: ICS calendar invite with financial lure and suspicious link	Sublime Security	1mo ago Aug 31st, 2026	Credential Phishing BEC/Fraud Social engineering Evasion File analysis Content analysis URL analysis Whois Header analysis
Attachment: ICS calendar invite with hex-encoded recipient in link	Sublime Security	27d ago Sep 28th, 2026	Credential Phishing Evasion Social engineering ICS Phishing File analysis URL analysis
Attachment: ICS calendar with embedded file from internal sender with SPF failure	Sublime Security	5mo ago Apr 28th, 2026	Credential Phishing Spoofing Evasion ICS Phishing File analysis Header analysis Sender analysis
Attachment: ICS calendar with suspicious link Leading to minimal JS landing page	Sublime Security	27d ago Sep 28th, 2026	Credential Phishing Free file host Free subdomain host Evasion Scripting Social engineering ICS Phishing File analysis URL analysis Whois Javascript analysis Content analysis
Attachment: ICS file with AWS Lambda URL	Sublime Security	3mo ago Jul 16th, 2026	Credential Phishing Malware/Ransomware Evasion Free file host ICS Phishing Content analysis File analysis URL analysis
Attachment: ICS file with excessive custom properties	Sublime Security	1mo ago Sep 4th, 2026	Malware/Ransomware Evasion ICS Phishing File analysis Content analysis
Attachment: ICS file with non-Gregorian calendar scale	Sublime Security	5mo ago Apr 28th, 2026	Credential Phishing Evasion ICS Phishing File analysis Content analysis
Attachment: ICS link with valueless base64 query parameter	Sublime Security	27d ago Sep 28th, 2026	Credential Phishing Evasion Social engineering ICS Phishing File analysis URL analysis Header analysis
Attachment: ICS voicemail lure with suspicious link	Sublime Security	11d ago Oct 14th, 2026	Credential Phishing Social engineering Free file host Evasion ICS Phishing File analysis Content analysis URL analysis Whois Header analysis
Attachment: ICS with embedded document	Sublime Security	5mo ago Apr 28th, 2026	Malware/Ransomware Evasion ICS Phishing File analysis

557 Rules

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