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
Credential phishing: Tax form impersonation with payment request	Sublime Security	6mo ago Feb 13th, 2026	BEC/Fraud Credential Phishing Impersonation: Brand Social engineering PDF Content analysis Header analysis Sender analysis URL analysis
Cyrillic vowel substitution in subject or display name from unknown sender	Sublime Security	1y ago Jul 16th, 2025	Credential Phishing Evasion Social engineering Spoofing Content analysis Header analysis Sender analysis
Deceptive Dropbox mention	Sublime Security	8mo ago Jan 12th, 2026	Credential Phishing Impersonation: Brand Free file host Free subdomain host Social engineering Header analysis Content analysis Natural Language Understanding Sender analysis URL analysis
Display name and subject impersonation using recipient SLD (new sender)	Sublime Security	1y ago Jul 16th, 2025	Credential Phishing Social engineering Header analysis Sender analysis
Display Name Emoji with Financial Symbols	Sublime Security	8mo ago Jan 12th, 2026	BEC/Fraud Callback Phishing Social engineering Evasion Content analysis Header analysis Sender analysis
Display name impersonation using recipient SLD	Sublime Security	8mo ago Jan 12th, 2026	Credential Phishing Social engineering Header analysis Sender analysis
DocuSign impersonation via CloudHQ links	Sublime Security	1mo ago Jul 27th, 2026	Credential Phishing BEC/Fraud Impersonation: Brand Free file host Header analysis URL analysis Content analysis Sender analysis
DocuSign impersonation via spoofed Intuit sender	Sublime Security	1y ago Aug 5th, 2025	Credential Phishing Impersonation: Brand Spoofing Header analysis Sender analysis
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 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
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 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 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 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 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
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 credential theft indicators	Sublime Security	2y ago Dec 12th, 2024	Credential Phishing Free subdomain host Content analysis Header analysis Natural Language Understanding Optical Character Recognition URL 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 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: iOS/iPadOS mailer with invalid build number	Sublime Security	3y ago Aug 17th, 2023	BEC/Fraud Credential Phishing Malware/Ransomware Evasion Header analysis
Headers: Outlook Express mailer	Sublime Security	10mo ago Nov 6th, 2025	BEC/Fraud Credential Phishing Malware/Ransomware Evasion Spoofing Header analysis
Headers: risky-recover-production message ID	Sublime Security	6mo ago Feb 26th, 2026	Spam Evasion Header 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
Headers: Zimbra mailer from a non-supported OS version	Sublime Security	3y ago Aug 17th, 2023	Header 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
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: 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: 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: SAM/SBA federal registration	Sublime Security	6d ago Sep 4th, 2026	Credential Phishing BEC/Fraud Impersonation: Brand Social engineering Image as content Sender analysis Content analysis HTML analysis Header analysis
Impersonation: SharePoint reply header anomaly	Sublime Security	8mo ago Jan 12th, 2026	Credential Phishing Social engineering Impersonation: Brand Evasion Spoofing Header analysis Content analysis Sender analysis
Impersonation: Suspected supplier impersonation with suspicious content	Sublime Security	1mo ago Jul 27th, 2026	BEC/Fraud Evasion Free email provider Lookalike domain Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis Whois
Impersonation using recipient domain (untrusted sender)	Sublime Security	1mo ago Jul 27th, 2026	Credential Phishing Social engineering Header analysis Sender analysis
Inbound message from popular service via newly observed distribution list	Sublime Security	1y ago Aug 5th, 2025	Callback Phishing Evasion Social engineering Header analysis Sender analysis
Invoicera infrastructure abuse	Sublime Security	2y ago Mar 7th, 2024	Credential Phishing Spam Free file host Free subdomain host Image as content Social engineering Content analysis Header analysis Sender analysis

436 Rules

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