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 3rd, 2026

Feed Source

GitHub

Attack Type is

Rule Name & Severity	Author	Last Updated	Labels
Attachment: Calendar invite with suspicious link leading to an open redirect	Sublime Security	8mo ago Jul 16th, 2025	Spam Free email provider Free file host Free subdomain host Open redirect Content analysis URL analysis
Attachment: Cold outreach with invitation subject and not attachment	Sublime Security	1h ago Apr 3rd, 2026	Spam Social engineering Image as content Content analysis Natural Language Understanding File analysis
BEC/Fraud: Urgent language and suspicious sending/infrastructure patterns	Sublime Security	2mo ago Jan 12th, 2026	BEC/Fraud Callback Phishing Spam Impersonation: Brand Social engineering Free email provider Content analysis Header analysis Sender analysis Whois
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: Comment with 24-character hex token	Sublime Security	17d ago Mar 17th, 2026	Spam Evasion Content analysis HTML analysis
Brand impersonation: Hulu	Sublime Security	2mo ago Jan 12th, 2026	Credential Phishing Spam Free email provider Impersonation: Brand Lookalike domain Social engineering Computer Vision Header analysis Sender analysis
Brand impersonation: KnowBe4	Sublime Security	2y ago Nov 25th, 2024	Credential Phishing Spam Free email provider Impersonation: Brand Lookalike domain Social engineering Computer Vision Header analysis Sender analysis
Brand impersonation: SendGrid	Sublime Security	22d ago Mar 12th, 2026	BEC/Fraud Credential Phishing Spam Impersonation: Brand Social engineering Content analysis Header analysis Natural Language Understanding Optical Character Recognition Sender analysis
Brand Impersonation: Shein	Sublime Security	5mo ago Oct 15th, 2025	Credential Phishing Spam Impersonation: Brand Social engineering Computer Vision Content analysis Header analysis Natural Language Understanding Optical Character Recognition Sender analysis
Brand impersonation: SiriusXM	Sublime Security	8mo ago Aug 5th, 2025	Callback Phishing Credential Phishing Spam Free email provider Impersonation: Brand Social engineering Content analysis Header analysis Sender analysis
Brand impersonation: Vanguard	Sublime Security	6mo ago Sep 22nd, 2025	BEC/Fraud Callback Phishing Credential Phishing Extortion Malware/Ransomware Spam Impersonation: Brand Natural Language Understanding Header analysis Sender analysis
Brand impersonation: WeTransfer	Sublime Security	8mo ago Aug 5th, 2025	BEC/Fraud Callback Phishing Credential Phishing Extortion Malware/Ransomware Spam Impersonation: Brand Content analysis Header analysis Sender analysis
Credential theft: Gophish abuse with hidden tracking image	Sublime Security	4mo ago Nov 5th, 2025	Spam Evasion Image as content Content analysis HTML analysis
Encrypted Microsoft Office files from untrusted sender	Sublime Security	8mo ago Aug 5th, 2025	BEC/Fraud Callback Phishing Credential Phishing Extortion Malware/Ransomware Spam Encryption Evasion File analysis YARA Sender 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 shipping notification with suspicious language	Sublime Security	2y ago May 3rd, 2024	Credential Phishing Spam Evasion Content analysis Natural Language Understanding
Fake thread with suspicious indicators	Sublime Security	2mo ago Jan 12th, 2026	BEC/Fraud Credential Phishing Spam Evasion Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis
Headers: Invalid recipient domain with mismatched reply-to from new sender	Sublime Security	4mo ago Nov 21st, 2025	BEC/Fraud Credential Phishing Spam Evasion Social engineering Header analysis Sender analysis
Headers: risky-recover-production message ID	Sublime Security	1mo ago Feb 26th, 2026	Spam Evasion Header 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
Link abuse: Self-service creation platform link with suspicious recipient behavior	Sublime Security	4mo ago Dec 2nd, 2025	BEC/Fraud Credential Phishing Spam Free email provider Social engineering Header analysis Sender analysis URL analysis
Link: Blogspot hosting explicit romance content	Sublime Security	25d ago Mar 9th, 2026	Spam Free subdomain host Social engineering Natural Language Understanding URL analysis
Link: Google Calendar invite linking to an open redirect from an untrusted freemail sender	Sublime Security	8mo ago Jul 16th, 2025	Spam Free email provider Free file host Open redirect Social engineering Content analysis Sender analysis URL analysis
Link: Romance/Sexual Language With Suspicious Link	Sublime Security	7mo ago Aug 22nd, 2025	Spam Social engineering Content analysis Header analysis URL analysis Whois
Link: Spam website with evasion indicators	Sublime Security	4mo ago Nov 25th, 2025	Spam Evasion URL analysis URL screenshot Content analysis
Link: Squarespace infrastructure abuse	Sublime Security	8mo ago Aug 5th, 2025	Credential Phishing Spam Impersonation: Brand Social engineering Header analysis URL analysis Sender analysis
Mass campaign: Cross Site Scripting (XSS) attempt	Sublime Security	8mo ago Jul 16th, 2025	Malware/Ransomware Spam Exploit Free email provider Scripting Social engineering Content analysis Header analysis Sender analysis
Mismatched links: Free file share with urgent language	Sublime Security	8mo ago Aug 5th, 2025	BEC/Fraud Callback Phishing Credential Phishing Extortion Malware/Ransomware Spam Free file host Social engineering Natural Language Understanding Sender analysis URL analysis
Open redirect: Cartoon Network	Sublime Security	2mo ago Jan 12th, 2026	Credential Phishing Spam Open redirect Evasion Content analysis URL analysis
Open redirect: Klaviyo	Sublime Security	2y ago May 14th, 2024	Credential Phishing Spam Evasion Impersonation: Brand Open redirect Social engineering Content analysis URL analysis
Potential prompt injection attack in body HTML	Sublime Security	2mo ago Jan 12th, 2026	Callback Phishing Credential Phishing Extortion Malware/Ransomware Spam BEC/Fraud Evasion Social engineering Header analysis HTML analysis Content analysis
Reconnaissance: Email address harvesting attempt	Sublime Security	1mo ago Feb 23rd, 2026	BEC/Fraud Credential Phishing Spam Free email provider Social engineering Content analysis Header analysis Sender analysis URL analysis
Reconnaissance: Empty message from uncommon sender	Sublime Security	1mo ago Feb 25th, 2026	Spam Evasion Social engineering Content analysis Header analysis
Sender: IP address in local part	Sublime Security	22d ago Mar 12th, 2026	Spam Credential Phishing BEC/Fraud Evasion Spoofing Sender analysis
Service abuse: Adobe Sign notification from an unsolicited reply-to address	Sublime Security	8mo ago Aug 5th, 2025	BEC/Fraud Callback Phishing Spam Social engineering Impersonation: Brand Header analysis Sender analysis
Service abuse: Apple TestFlight with suspicious developer reference	Sublime Security	1mo ago Feb 6th, 2026	Spam Social engineering Content analysis HTML analysis Natural Language Understanding Sender analysis URL analysis
Service abuse: Domains By Proxy sender	Sublime Security	16d ago Mar 18th, 2026	Spam Credential Phishing BEC/Fraud Evasion Social engineering Header analysis Sender analysis
Service abuse: Google Firebase sender address with suspicious content	Sublime Security	1d ago Apr 2nd, 2026	Spam Credential Phishing Free subdomain host Social engineering Content analysis Header analysis HTML analysis Natural Language Understanding Sender analysis URL analysis Whois
Sharepoint online with external recipients and external display name	@vector_sec	3y ago Aug 17th, 2023	Credential Phishing Spam Evasion Content analysis Header analysis Sender analysis
Shopify infrastructure abuse	Sublime Security	2y ago Nov 13th, 2024	Credential Phishing Spam Evasion Free subdomain host Impersonation: Brand Social engineering Content analysis Header analysis URL analysis
Spam: Attendee list solicitation	Sublime Security	7mo ago Aug 29th, 2025	Spam Content analysis Sender analysis
Spam: BlackBaud infrastructure abuse	Sublime Security	2y ago Jan 17th, 2024	Spam Evasion Impersonation: Brand Image as content Social engineering Content analysis Header analysis
Spam: Campaign with excessive display-text and keywords found	Sublime Security	2mo ago Jan 12th, 2026	Spam Content analysis
Spam: Campaign with excessive space/char obfuscation and free file hosted link	Sublime Security	2mo ago Jan 12th, 2026	Spam Free file host Content analysis Sender analysis
Spam: Commonly observed formatting of unauthorized free giveaways	Sublime Security	2mo ago Jan 14th, 2026	Spam Impersonation: Brand Social engineering Content analysis HTML analysis Sender analysis URL analysis
Spam: Cryptocurrency airdrop/giveaway	Sublime Security	5mo ago Oct 16th, 2025	Spam Social engineering Impersonation: Brand Content analysis
Spam: Default Microsoft Exchange Online sender domain (onmicrosoft.com)	Sublime Security	2mo ago Jan 12th, 2026	Callback Phishing Credential Phishing Spam Free email provider Impersonation: Brand Social engineering Content analysis Sender analysis
Spam: Fake dating profile notification	Sublime Security	14d ago Mar 20th, 2026	Spam Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis
Spam: Fake photo share	Sublime Security	4mo ago Nov 8th, 2025	Spam Evasion Social engineering Content analysis Sender analysis URL analysis Whois
Spam: Firebase password reset from suspicious sender	Sublime Security	4mo ago Dec 2nd, 2025	Credential Phishing Spam Evasion Social engineering Header analysis Sender analysis URL analysis

76 Rules

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