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

Feed Source

GitHub

Detection Method is

Rule Name & Severity	Author	Last Updated	Labels
COVID-19 themed fraud with sender and reply-to mismatch or compensation award	Sublime Security	1mo ago Sep 23rd, 2026	BEC/Fraud Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
Credential Phishing: Bitcoin portfolio confirmation	Sublime Security	1mo ago Aug 27th, 2026	Credential Phishing BEC/Fraud Social engineering Content analysis Natural Language Understanding Header analysis
Credential phishing: DocuSign embedded image lure with no DocuSign domains in links	Sublime Security	1mo ago Sep 23rd, 2026	Credential Phishing Impersonation: Brand Social engineering Computer Vision Content analysis Header analysis Natural Language Understanding Optical Character Recognition Sender analysis
Credential phishing: Engaging language and other indicators (untrusted sender)	Sublime Security	24d ago Oct 1st, 2026	Credential Phishing Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis
Credential phishing: Financial lure via ActiveCampaign infrastructure	Sublime Security	2d ago Oct 23rd, 2026	Credential Phishing Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
Credential phishing: Hyper-linked image leading to free file host	Sublime Security	26d ago Sep 29th, 2026	Credential Phishing Evasion Free file host Image as content Social engineering Content analysis Header analysis Sender analysis URL analysis
Credential phishing: Image as content, short or no body contents	Sublime Security	9mo ago Jan 12th, 2026	Credential Phishing Evasion Image as content Computer Vision Content analysis File analysis Header analysis Natural Language Understanding Optical Character Recognition
Credential phishing language and suspicious indicators (unknown sender)	Sublime Security	26d ago Sep 29th, 2026	Credential Phishing Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis
Credential phishing: Onedrive impersonation	Sublime Security	3mo ago Jul 16th, 2026	Credential Phishing Free subdomain host Impersonation: Brand Social engineering Content analysis Header analysis Natural Language Understanding URL analysis
Credential phishing: Re-Authentication lure	Sublime Security	1mo ago Sep 23rd, 2026	Credential Phishing Social engineering Impersonation: Brand Natural Language Understanding Content analysis URL analysis Header analysis Sender analysis
Credential phishing: Suspicious e-sign agreement document notification	Sublime Security	3d ago Oct 22nd, 2026	Credential Phishing Social engineering Content analysis Header analysis HTML analysis URL analysis Sender analysis
Credential Phishing: Suspicious language, link, recipients and other indicators	Sublime Security	1y ago Jul 16th, 2025	Credential Phishing Evasion Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis
Credential phishing: Suspicious subject with urgent financial request and link	Sublime Security	1mo ago Sep 23rd, 2026	Credential Phishing Impersonation: Brand Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
Credential phishing: Tax form impersonation with payment request	Sublime Security	1mo ago Sep 23rd, 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	9mo 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	1mo ago Sep 23rd, 2026	Credential Phishing Social engineering Header analysis Sender analysis
Display Name Emoji with Financial Symbols	Sublime Security	9mo 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	1mo ago Sep 23rd, 2026	Credential Phishing Social engineering Header analysis Sender analysis
DocuSign impersonation via CloudHQ links	Sublime Security	2mo 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	9mo 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	7mo 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	1mo ago Sep 23rd, 2026	BEC/Fraud Impersonation: Employee Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
Evasion: Suspicious use of Unicode tag characters	Sublime Security	21d ago Oct 4th, 2026	BEC/Fraud Credential Phishing Evasion Social engineering Content analysis HTML analysis Header analysis
Evasion: Zero-width character stuffing in subject or sender name	Sublime Security	16d ago Oct 9th, 2026	Credential Phishing Spam Evasion Content analysis Header analysis
Extortion / sextortion (untrusted sender)	Sublime Security	1mo ago Sep 23rd, 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	9mo 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	1mo ago Sep 23rd, 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	1mo ago Sep 23rd, 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	4mo 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	8mo 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	9mo ago Jan 12th, 2026	Credential Phishing Social engineering Content analysis Header analysis Sender analysis URL analysis
Google services using g.co shortlinks	Sublime Security	9mo 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	9mo 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	9mo 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	11mo 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	11mo ago Nov 6th, 2025	BEC/Fraud Credential Phishing Malware/Ransomware Evasion Spoofing Header analysis
Headers: risky-recover-production message ID	Sublime Security	8mo ago Feb 26th, 2026	Spam Evasion Header analysis
Headers: Self-sender using Microsoft CompAuth bypass with credential theft content	Sublime Security	6mo 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	9mo 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	5mo 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

466 Rules

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