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 Apr 24th, 2026

Feed Source

GitHub

Detection Method is

Rule Name & Severity	Author	Last Updated	Labels
Advance Fee Fraud (AFF) from freemail provider or suspicious TLD	Sublime Security	10d ago Apr 14th, 2026	BEC/Fraud Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
AnonymousFox indicators	Sublime Security	8mo ago Aug 5th, 2025	BEC/Fraud Credential Phishing Malware/Ransomware Header analysis Sender analysis
Attachment: Any .sap file (unsolicited)	Sublime Security	5mo ago Oct 27th, 2025	Malware/Ransomware Evasion Scripting File analysis Header analysis Sender analysis
Attachment: Callback phishing solicitation via text-based file	Sublime Security	7mo ago Sep 22nd, 2025	Callback Phishing Evasion Out of band pivot Social engineering Content analysis File analysis Header analysis Sender analysis
Attachment: Compensation review lure with QR code	Sublime Security	10d ago Apr 14th, 2026	Credential Phishing PDF QR code Social engineering File analysis Optical Character Recognition QR code analysis Natural Language Understanding Sender analysis Header analysis
Attachment: DocuSign impersonation via PDF linking to new domain	Sublime Security	3mo ago Jan 12th, 2026	Credential Phishing Impersonation: Brand PDF Social engineering Header analysis Sender analysis URL analysis File analysis Computer Vision Whois
Attachment: Dropbox image lure with no Dropbox domains in links	Sublime Security	9mo ago Jul 16th, 2025	Credential Phishing Impersonation: Brand Social engineering Content analysis File analysis Header analysis Optical Character Recognition Sender analysis
Attachment: EML file contains HTML attachment with login portal indicators	Sublime Security	3mo ago Jan 12th, 2026	Credential Phishing Evasion HTML smuggling Content analysis File analysis Header analysis HTML analysis Javascript analysis Sender analysis
Attachment: EML file with HTML attachment (unsolicited)	Sublime Security	8mo ago Aug 20th, 2025	Credential Phishing Malware/Ransomware Evasion HTML smuggling Content analysis File analysis Header analysis HTML analysis Sender analysis
Attachment: EML with link to credential phishing page	Sublime Security	9mo ago Jul 16th, 2025	Credential Phishing Evasion Free file host Free subdomain host Social engineering Computer Vision Content analysis File analysis Header analysis HTML analysis Natural Language Understanding Optical Character Recognition URL analysis URL screenshot
Attachment: EML with Sharepoint link likely unrelated to sender	Sublime Security	7mo ago Sep 23rd, 2025	BEC/Fraud Credential Phishing Impersonation: Brand Social engineering Evasion File analysis URL analysis Header analysis Sender analysis
Attachment: Fake secure message and suspicious indicators	Sublime Security	3mo ago Jan 12th, 2026	Credential Phishing Image as content Impersonation: Brand Social engineering Content analysis File analysis Header analysis Natural Language Understanding Sender analysis
Attachment: HTML smuggling Microsoft sign in	Sublime Security	3mo ago Jan 12th, 2026	Credential Phishing Free subdomain host HTML smuggling Impersonation: Brand Social engineering Archive analysis Content analysis File analysis Header analysis Javascript analysis Sender analysis URL analysis
Attachment: HTML smuggling - QR Code with suspicious links	Sublime Security	3mo ago Jan 12th, 2026	Credential Phishing QR code Computer Vision Header analysis Natural Language Understanding QR code analysis Sender analysis URL analysis URL screenshot
Attachment: ICS calendar with embedded file from internal sender with SPF failure	Sublime Security	6mo ago Oct 22nd, 2025	Credential Phishing Spoofing Evasion File analysis Header analysis Sender analysis
Attachment: ICS file with meeting prefix	Sublime Security	2mo ago Jan 26th, 2026	BEC/Fraud Credential Phishing Social engineering File analysis Header analysis
Attachment: Legal themed message or PDF with suspicious indicators	Sublime Security	21d ago Apr 3rd, 2026	Credential Phishing Extortion BEC/Fraud Evasion PDF Social engineering Content analysis File analysis Natural Language Understanding Optical Character Recognition URL analysis Whois Header analysis Exif analysis
Attachment: Microsoft 365 credential phishing	Sublime Security	3mo ago Jan 12th, 2026	Credential Phishing Impersonation: Brand Social engineering Content analysis File analysis Header analysis Optical Character Recognition Sender analysis
Attachment: Microsoft impersonation via PDF with link and suspicious language	Sublime Security	9mo ago Jul 16th, 2025	Credential Phishing Malware/Ransomware Image as content Impersonation: Brand PDF Scripting Social engineering Computer Vision File analysis Header analysis Natural Language Understanding Sender analysis
Attachment: PDF with credential theft language and invalid reply-to domain	Sublime Security	14d ago Apr 10th, 2026	Credential Phishing PDF Social engineering Spoofing File analysis Header analysis Natural Language Understanding Content analysis
Attachment: QR code with credential phishing indicators	Sublime Security	3mo ago Jan 12th, 2026	Credential Phishing QR code Social engineering Computer Vision Header analysis Natural Language Understanding QR code analysis Sender analysis URL analysis URL screenshot
Attachment: RFC822 containing suspicious file sharing language with links from untrusted sender	Sublime Security	5mo ago Nov 4th, 2025	Credential Phishing Evasion Social engineering File analysis Header analysis Natural Language Understanding Sender analysis
Attachment: USDA bid invitation impersonation	Sublime Security	8mo 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 with auto-executing macro (unsolicited)	Sublime Security	3mo ago Jan 12th, 2026	Malware/Ransomware Macros Archive analysis Header analysis File analysis Macro analysis OLE analysis Sender analysis
BEC/Fraud: Generic scam attempt to undisclosed recipients	Sublime Security	3mo ago Jan 12th, 2026	BEC/Fraud Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
BEC/Fraud: Penpal scam	Sublime Security	8mo ago Aug 5th, 2025	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	1mo ago Mar 11th, 2026	BEC/Fraud Social engineering Evasion Content analysis Header analysis Sender analysis
BEC/Fraud: Romance scam	Sublime Security	1mo ago Mar 9th, 2026	BEC/Fraud Free email provider Social engineering Content analysis Header analysis
BEC/Fraud: Scam lure with freemail pivot	Sublime Security	8mo ago Aug 5th, 2025	BEC/Fraud Free email provider Out of band pivot Content analysis Header analysis Sender analysis
BEC/Fraud: Urgent language and suspicious sending/infrastructure patterns	Sublime Security	7d ago Apr 17th, 2026	BEC/Fraud Callback Phishing Spam Impersonation: Brand Social engineering Free email provider Content analysis Header analysis Sender analysis Whois
BEC with unusual reply-to or return-path mismatch	Sublime Security	1mo ago Mar 3rd, 2026	BEC/Fraud Evasion Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
Benefits enrollment impersonation	Sublime Security	21d ago Apr 3rd, 2026	Credential Phishing Evasion Impersonation: Employee Out of band pivot Social engineering Content analysis Header analysis Sender analysis
Body: Embedded email headers indicative of thread hijacking/abuse	Sublime Security	4mo ago Dec 1st, 2025	Credential Phishing BEC/Fraud Spam Evasion Social engineering Spoofing Content analysis Header analysis Sender analysis
Body HTML: Recipient SLD in HTML class	Sublime Security	7mo ago Sep 23rd, 2025	Credential Phishing Evasion Social engineering HTML analysis Header analysis Sender analysis
Brand impersonation: AARP	Sublime Security	4mo ago Dec 1st, 2025	BEC/Fraud Credential Phishing Impersonation: Brand Social engineering Content analysis Header analysis Sender analysis
Brand impersonation: Adobe (QR code)	Sublime Security	4d ago Apr 20th, 2026	Credential Phishing Impersonation: Brand PDF QR code Computer Vision Header analysis QR code analysis Sender analysis
Brand impersonation: Adobe Sign with suspicious indicators	Sublime Security	3mo ago Jan 8th, 2026	Credential Phishing Impersonation: Brand Social engineering Content analysis Header analysis HTML analysis Sender analysis
Brand impersonation: Adobe with suspicious language and link	Sublime Security	5mo ago Nov 24th, 2025	Credential Phishing Impersonation: Brand Social engineering Computer Vision Content analysis Header analysis Sender analysis
Brand impersonation: ADP	Sublime Security	3mo ago Jan 12th, 2026	Credential Phishing Impersonation: Brand Social engineering Header analysis Sender analysis
Brand impersonation: AliExpress	Sublime Security	8mo ago Aug 5th, 2025	Callback Phishing Credential Phishing Impersonation: Brand Social engineering Content analysis Header analysis URL analysis
Brand impersonation: Amazon	Sublime Security	2mo ago Feb 13th, 2026	Credential Phishing Impersonation: Brand Social engineering Header analysis Sender analysis
Brand impersonation: Amazon Web Services (AWS)	Sublime Security	6mo ago Oct 10th, 2025	Credential Phishing Impersonation: Brand Social engineering Content analysis Header analysis Optical Character Recognition Sender analysis Natural Language Understanding
Brand impersonation: Amazon with suspicious attachment	Sublime Security	10d ago Apr 14th, 2026	Credential Phishing Impersonation: Brand Social engineering Computer Vision File analysis Header analysis Natural Language Understanding Optical Character Recognition Sender analysis
Brand impersonation: American Express (AMEX)	Sublime Security	2mo ago Feb 17th, 2026	Credential Phishing Impersonation: Brand Lookalike domain Social engineering Header analysis Sender analysis
Brand impersonation: Apple	Sublime Security	3y ago Aug 21st, 2023	Credential Phishing Impersonation: Brand Social engineering Header analysis Sender analysis
Brand impersonation: Aquent	Sublime Security	6mo ago Oct 9th, 2025	BEC/Fraud Credential Phishing Impersonation: Brand Social engineering Content analysis Header analysis Sender analysis
Brand impersonation: Aramco	Sublime Security	2mo ago Jan 28th, 2026	BEC/Fraud Impersonation: Brand Lookalike domain Social engineering Content analysis Header analysis HTML analysis Natural Language Understanding Sender analysis
Brand impersonation: AuthentiSign	Sublime Security	3mo ago Jan 21st, 2026	Credential Phishing BEC/Fraud Impersonation: Brand Lookalike domain Social engineering Content analysis Header analysis Sender analysis
Brand impersonation: Automobile assistance associations	Sublime Security	40m ago Apr 24th, 2026	Credential Phishing Impersonation: Brand Social engineering Content analysis Natural Language Understanding Header analysis Sender analysis
Brand impersonation: Bank of America	Sublime Security	24d ago Mar 31st, 2026	Credential Phishing Impersonation: Brand Lookalike domain Social engineering Header analysis Sender analysis

371 Rules

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