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 Jan 23rd, 2026

Feed Source

GitHub

Detection Method is

Rule Name & Severity	Author	Last Updated	Labels
Catbox.moe link from untrusted source	Sublime Security	5mo ago Aug 5th, 2025	Malware/Ransomware Free file host Social engineering Header analysis Sender analysis URL analysis	/feeds/core/detection-rules/catboxmoe-link-from-untrusted-source-d6041a8b
ClickFunnels link infrastructure abuse	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Free email provider Free subdomain host Social engineering Content analysis Header analysis QR code analysis Sender analysis URL analysis	/feeds/core/detection-rules/clickfunnels-link-infrastructure-abuse-9192fbe9
Cloud storage impersonation with credential theft indicators	Sublime Security	4mo ago Sep 22nd, 2025	Credential Phishing Free file host Image as content Impersonation: Brand Social engineering Computer Vision Content analysis Header analysis Natural Language Understanding Optical Character Recognition Sender analysis URL analysis	/feeds/core/detection-rules/cloud-storage-impersonation-with-credential-theft-indicators-4c20f72c
Constant Contact link infrastructure abuse	Sublime Security	3mo ago Oct 17th, 2025	Credential Phishing Free email provider Open redirect Social engineering Content analysis Header analysis QR code analysis Sender analysis	/feeds/core/detection-rules/constant-contact-link-infrastructure-abuse-8c5e8e4c
COVID-19 themed fraud with sender and reply-to mismatch or compensation award	Sublime Security	11d ago Jan 12th, 2026	BEC/Fraud Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/covid-19-themed-fraud-with-sender-and-reply-to-mismatch-or-compensation-award-a16480ef
Credential phishing: DocuSign embedded image lure with no DocuSign domains in links	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Impersonation: Brand Social engineering Computer Vision Content analysis Header analysis Natural Language Understanding Optical Character Recognition Sender analysis	/feeds/core/detection-rules/credential-phishing-docusign-embedded-image-lure-with-no-docusign-domains-in-links-dfe8715e
Credential phishing: Engaging language and other indicators (untrusted sender)	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis	/feeds/core/detection-rules/credential-phishing-engaging-language-and-other-indicators-untrusted-sender-c2bc8ca2
Credential phishing: Hyper-linked image leading to free file host	Sublime Security	5mo ago Aug 5th, 2025	Credential Phishing Evasion Free file host Image as content Social engineering Content analysis Header analysis Sender analysis URL analysis	/feeds/core/detection-rules/credential-phishing-hyper-linked-image-leading-to-free-file-host-f5cb1eca
Credential phishing: Image as content, short or no body contents	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Evasion Image as content Computer Vision Content analysis File analysis Header analysis Natural Language Understanding Optical Character Recognition	/feeds/core/detection-rules/credential-phishing-image-as-content-short-or-no-body-contents-01313f38
Credential phishing language and suspicious indicators (unknown sender)	Sublime Security	6mo ago Jul 16th, 2025	Credential Phishing Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis	/feeds/core/detection-rules/credential-phishing-language-and-suspicious-indicators-unknown-sender-89c186f7
Credential phishing: Onedrive impersonation	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Free subdomain host Impersonation: Brand Social engineering Content analysis Header analysis Natural Language Understanding URL analysis	/feeds/core/detection-rules/credential-phishing-onedrive-impersonation-1f990c92
Credential phishing: Re-Authentication lure	Sublime Security	3mo ago Oct 17th, 2025	Credential Phishing Social engineering Impersonation: Brand Natural Language Understanding Content analysis URL analysis Header analysis Sender analysis	/feeds/core/detection-rules/credential-phishing-re-authentication-lure-2e45d3de
Credential phishing: Suspicious e-sign agreement document notification	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Social engineering Content analysis Header analysis HTML analysis URL analysis Sender analysis	/feeds/core/detection-rules/credential-phishing-suspicious-e-sign-agreement-document-notification-9b68c2d8
Credential Phishing: Suspicious language, link, recipients and other indicators	Sublime Security	6mo ago Jul 16th, 2025	Credential Phishing Evasion Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis	/feeds/core/detection-rules/credential-phishing-suspicious-language-link-recipients-and-other-indicators-dcb39190
Credential phishing: Suspicious subject with urgent financial request and link	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Impersonation: Brand Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/credential-phishing-suspicious-subject-with-urgent-financial-request-and-link-056464f4
Credential phishing: Tax form impersonation with payment request	Sublime Security	4mo ago Sep 10th, 2025	BEC/Fraud Credential Phishing Impersonation: Brand Social engineering PDF Content analysis Header analysis Sender analysis URL analysis	/feeds/core/detection-rules/credential-phishing-tax-form-impersonation-with-payment-request-717695cf
Cyrillic vowel substitution in subject or display name from unknown sender	Sublime Security	6mo ago Jul 16th, 2025	Credential Phishing Evasion Social engineering Spoofing Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/cyrillic-vowel-substitution-in-subject-or-display-name-from-unknown-sender-74bc0b0c
Deceptive Dropbox mention	Sublime Security	11d 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	/feeds/core/detection-rules/deceptive-dropbox-mention-58a107bc
Display name and subject impersonation using recipient SLD (new sender)	Sublime Security	6mo ago Jul 16th, 2025	Credential Phishing Social engineering Header analysis Sender analysis	/feeds/core/detection-rules/display-name-and-subject-impersonation-using-recipient-sld-new-sender-cb2b3ed3
Display Name Emoji with Financial Symbols	Sublime Security	11d ago Jan 12th, 2026	BEC/Fraud Callback Phishing Social engineering Evasion Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/display-name-emoji-with-financial-symbols-f316f335
Display name impersonation using recipient SLD	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Social engineering Header analysis Sender analysis	/feeds/core/detection-rules/display-name-impersonation-using-recipient-sld-81a8ed12
DocuSign impersonation via CloudHQ links	Sublime Security	5mo ago Aug 5th, 2025	Credential Phishing BEC/Fraud Impersonation: Brand Free file host Header analysis URL analysis Content analysis Sender analysis	/feeds/core/detection-rules/docusign-impersonation-via-cloudhq-links-44ba2fee
DocuSign impersonation via spoofed Intuit sender	Sublime Security	5mo ago Aug 5th, 2025	Credential Phishing Impersonation: Brand Spoofing Header analysis Sender analysis	/feeds/core/detection-rules/docusign-impersonation-via-spoofed-intuit-sender-d437710b
Domain impersonation: Freemail reply-to local lookalike with financial request	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/domain-impersonation-freemail-reply-to-local-lookalike-with-financial-request-43026a40
EML attachment with credential theft language (unknown sender)	Sublime Security	3mo ago Oct 3rd, 2025	Credential Phishing Evasion Social engineering Natural Language Understanding Sender analysis Content analysis Header analysis	/feeds/core/detection-rules/eml-attachment-with-credential-theft-language-unknown-sender-00e06af1
Employee impersonation with urgent request (untrusted sender)	Sublime Security	11d ago Jan 12th, 2026	BEC/Fraud Impersonation: Employee Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/employee-impersonation-with-urgent-request-untrusted-sender-1ce9a146
Extortion / sextortion (untrusted sender)	Sublime Security	1d ago Jan 22nd, 2026	Extortion Social engineering Spoofing Content analysis Header analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/extortion-sextortion-untrusted-sender-265913eb
Fake message thread - Untrusted sender with a mismatched freemail reply-to address	Sublime Security	11d ago Jan 12th, 2026	BEC/Fraud Free email provider Social engineering Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/fake-message-thread-untrusted-sender-with-a-mismatched-freemail-reply-to-address-ca64e819
Fake message thread with a suspicious link and engaging language from an unknown sender	Sublime Security	2mo ago Nov 12th, 2025	Credential Phishing Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis	/feeds/core/detection-rules/fake-message-thread-with-a-suspicious-link-and-engaging-language-from-an-unknown-sender-8fd0e211
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	/feeds/core/detection-rules/fake-shipping-notification-with-link-to-free-file-hosting-6d3fe05e
Fake thread with suspicious indicators	Sublime Security	11d ago Jan 12th, 2026	BEC/Fraud Credential Phishing Spam Evasion Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/fake-thread-with-suspicious-indicators-c2e18a57
Fake Zoom meeting invite with suspicious link	Sublime Security	1mo ago Dec 1st, 2025	Credential Phishing Impersonation: Brand Evasion Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis	/feeds/core/detection-rules/fake-zoom-meeting-invite-with-suspicious-link-aba95f23
File sharing link with a suspicious subject	Sublime Security	6mo ago Jul 16th, 2025	BEC/Fraud Free file host Social engineering Header analysis Sender analysis URL analysis	/feeds/core/detection-rules/file-sharing-link-with-a-suspicious-subject-a306e2a6
Fraudulent e-commerce operators	Sublime Security	5mo ago Aug 5th, 2025	BEC/Fraud Impersonation: Brand Lookalike domain Social engineering Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/fraudulent-e-commerce-operators-3776a6fc
Free email provider sender with mismatched provider reply-to	Sublime Security	5mo ago Aug 5th, 2025	BEC/Fraud Credential Phishing Free email provider Social engineering Header analysis Sender analysis	/feeds/core/detection-rules/free-email-provider-sender-with-mismatched-provider-reply-to-fcd831d0
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	/feeds/core/detection-rules/free-subdomain-link-with-credential-theft-indicators-9187479c
Generic service abuse from newly registered domain	Sublime Security	5mo ago Aug 5th, 2025	BEC/Fraud Callback Phishing Credential Phishing Evasion Social engineering Header analysis Sender analysis Whois	/feeds/core/detection-rules/generic-service-abuse-from-newly-registered-domain-0937b4c5
Google Notification alert link from non-Google sender	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Social engineering Content analysis Header analysis Sender analysis URL analysis	/feeds/core/detection-rules/google-notification-alert-link-from-non-google-sender-a1c1acfd
Google services using g.co shortlinks	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Evasion Free email provider Content analysis Header analysis Sender analysis URL analysis	/feeds/core/detection-rules/google-services-using-gco-shortlinks-09ff8a73
Google share notification with suspicious comments	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Impersonation: VIP Free file host HTML analysis Header analysis Sender analysis Content analysis	/feeds/core/detection-rules/google-share-notification-with-suspicious-comments-c69c9924
Hardbacon infrastructure abuse	Sublime Security	2y ago Dec 20th, 2024	Credential Phishing Evasion Impersonation: Brand Social engineering Header analysis Sender analysis	/feeds/core/detection-rules/hardbacon-infrastructure-abuse-5330db42
Headers: Fake in-reply-to with wildcard sender and missing thread context	Sublime Security	2h ago Jan 23rd, 2026	BEC/Fraud Credential Phishing Evasion Social engineering Spoofing Header analysis Sender analysis Content analysis	/feeds/core/detection-rules/headers-fake-in-reply-to-with-wildcard-sender-and-missing-thread-context-89da670a
Headers: Invalid recipient domain with mismatched reply-to from new sender	Sublime Security	2mo ago Nov 21st, 2025	BEC/Fraud Credential Phishing Spam Evasion Social engineering Header analysis Sender analysis	/feeds/core/detection-rules/headers-invalid-recipient-domain-with-mismatched-reply-to-from-new-sender-f375ded1
Headers: iOS/iPadOS mailer with invalid build number	Sublime Security	3y ago Aug 17th, 2023	BEC/Fraud Credential Phishing Malware/Ransomware Evasion Header analysis	/feeds/core/detection-rules/headers-iosipados-mailer-with-invalid-build-number-e0b74072
Headers: Outlook Express mailer	Sublime Security	2mo ago Nov 6th, 2025	BEC/Fraud Credential Phishing Malware/Ransomware Evasion Spoofing Header analysis	/feeds/core/detection-rules/headers-outlook-express-mailer-b7a698de
Headers: System account impersonation with empty sender address	Sublime Security	11d ago Jan 12th, 2026	BEC/Fraud Credential Phishing Impersonation: Employee Social engineering Spoofing Header analysis Sender analysis Natural Language Understanding	/feeds/core/detection-rules/headers-system-account-impersonation-with-empty-sender-address-887f7953
Headers: Zimbra mailer from a non-supported OS version	Sublime Security	3y ago Aug 17th, 2023	Header analysis	/feeds/core/detection-rules/headers-zimbra-mailer-from-a-non-supported-os-version-d23e694f
Honorific greeting BEC attempt with sender and reply-to mismatch	Sublime Security	11d ago Jan 12th, 2026	BEC/Fraud Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/honorific-greeting-bec-attempt-with-sender-and-reply-to-mismatch-aa41b1b7
HR impersonation via e-sign agreement comment	Sublime Security	11d ago Jan 12th, 2026	BEC/Fraud Credential Phishing Evasion Impersonation: Brand Out of band pivot Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/hr-impersonation-via-e-sign-agreement-comment-796c6f0f
Impersonation: Chrome Web Store policy	Sublime Security	5mo ago Aug 5th, 2025	Credential Phishing Impersonation: Brand Free email provider Lookalike domain Content analysis Header analysis HTML analysis Sender analysis URL analysis	/feeds/core/detection-rules/impersonation-chrome-web-store-policy-4a98f283

337 Rules

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