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 30th, 2026

Feed Source

GitHub

Tactic or Technique is

Rule Name & Severity	Author	Last Updated	Labels
Attachment: Calendar file with invisible Unicode characters	Sublime Security	5mo ago Apr 28th, 2026	BEC/Fraud Credential Phishing Malware/Ransomware Evasion ICS Phishing File analysis Content analysis
Attachment: Calendar invite from recently registered domain	Sublime Security	5mo ago Apr 28th, 2026	Callback Phishing Evasion ICS Phishing Social engineering File analysis Whois
Attachment: Calendar invite with Google redirect and invoice request	Sublime Security	5mo ago Apr 28th, 2026	Credential Phishing BEC/Fraud ICS Phishing Open redirect Social engineering File analysis Natural Language Understanding URL analysis
Attachment: Calendar invite with suspicious link leading to an open redirect	Sublime Security	2d ago Sep 28th, 2026	Spam Free email provider Free file host Free subdomain host ICS Phishing Open redirect Content analysis URL analysis
Attachment: HTML smuggling with atob and high entropy via calendar invite	Sublime Security	7d 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 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: ICS calendar file with base64 encoded recipient address in URL parameters	Sublime Security	4mo 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	2d ago Sep 28th, 2026	BEC/Fraud Social engineering Evasion ICS Phishing 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 file with suspicious UID domain	Sublime Security	1d ago Sep 29th, 2026	Credential Phishing BEC/Fraud Social engineering ICS Phishing File analysis Content analysis
Attachment: ICS calendar invite hiding credential theft	Sublime Security	2d 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 bid/RFP lure and suspicious link	Sublime Security	2d ago Sep 28th, 2026	BEC/Fraud Social engineering Free file host Free subdomain host Lookalike domain ICS Phishing File analysis Content analysis URL analysis Whois
Attachment: ICS calendar invite with hex-encoded recipient in link	Sublime Security	2d 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	2d 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	2mo ago Jul 16th, 2026	Credential Phishing Malware/Ransomware Evasion Free file host ICS Phishing Content analysis File analysis URL analysis
Attachment: ICS file with credential theft indicators	Sublime Security	2d ago Sep 28th, 2026	Credential Phishing Free file host Free subdomain host Social engineering ICS Phishing File analysis Natural Language Understanding URL analysis Whois
Attachment: ICS file with excessive custom properties	Sublime Security	26d ago Sep 4th, 2026	Malware/Ransomware Evasion ICS Phishing File analysis Content analysis
Attachment: ICS file with meeting prefix	Sublime Security	5mo ago Apr 28th, 2026	BEC/Fraud Credential Phishing ICS Phishing Social engineering File analysis Header 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 invite meeting lure	Sublime Security	2d ago Sep 28th, 2026	Credential Phishing Social engineering Impersonation: Brand Spoofing Open redirect ICS Phishing Content analysis URL analysis Header analysis Sender analysis File analysis
Attachment: ICS link with valueless base64 query parameter	Sublime Security	2d 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	2d ago Sep 28th, 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
Attachment: ICS with embedded Javascript in SVG file	Sublime Security	5mo ago Apr 28th, 2026	Credential Phishing Malware/Ransomware Scripting Evasion ICS Phishing File analysis Javascript analysis Sender analysis
Attachment: ICS with employee policy review lure	Sublime Security	5mo ago Apr 28th, 2026	Credential Phishing BEC/Fraud Evasion ICS Phishing Social engineering File analysis Content analysis
Attachment: ICS with Suspicious Office 365 app authorization (OAuth) link	Sublime Security	2d ago Sep 28th, 2026	Credential Phishing Evasion Social engineering ICS Phishing File analysis Content analysis URL analysis
Attachment: Oversized guest-list calendar invite with purchase order lure	Sublime Security	2d ago Sep 28th, 2026	BEC/Fraud Social engineering Impersonation: Brand ICS Phishing File analysis Content analysis Natural Language Understanding Sender analysis Header analysis
Attachment: Oversized guest-list calendar invite with voicemail lure	Sublime Security	2d ago Sep 28th, 2026	BEC/Fraud Social engineering Impersonation: Brand ICS Phishing File analysis Content analysis Natural Language Understanding Sender analysis Header analysis
Callback phishing via calendar invite	Sublime Security	1mo ago Aug 7th, 2026	Callback Phishing Social engineering Evasion ICS Phishing File analysis Header analysis Natural Language Understanding Sender analysis
Link: Google Calendar invite linking to an open redirect from an untrusted freemail sender	Sublime Security	2d ago Sep 28th, 2026	Spam Free email provider Free file host ICS Phishing Open redirect Social engineering Content analysis Sender analysis URL analysis
Non-RFC compliant calendar files from unsolicited sender	Sublime Security	5mo ago Apr 28th, 2026	Evasion ICS Phishing Social engineering Archive analysis Content analysis File analysis Sender analysis
Service abuse: Google Calendar notification with callback scam language	Sublime Security	5mo ago Apr 28th, 2026	Callback Phishing ICS Phishing Out of band pivot Social engineering Natural Language Understanding Content analysis Sender analysis

33 Rules