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 Mar 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	25d ago Feb 13th, 2026	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
Credential Phishing via Dropbox comment abuse	Sublime Security	5mo ago Sep 22nd, 2025	Credential Phishing Evasion Out of band pivot Social engineering Content analysis Computer Vision Sender analysis	/feeds/core/detection-rules/credential-phishing-via-dropbox-comment-abuse-744d494d
CVE-2023-5631 - Roundcube Webmail XSS via crafted SVG	Sublime Security	1mo ago Jan 12th, 2026	Malware/Ransomware Evasion Exploit HTML smuggling Scripting Content analysis HTML analysis Sender analysis	/feeds/core/detection-rules/cve-2023-5631-roundcube-webmail-xss-via-crafted-svg-8405d61b
Cyrillic vowel substitution in subject or display name from unknown sender	Sublime Security	7mo 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
Cyrillic vowel substitutions with suspicious subject from unknown sender	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Evasion Impersonation: Brand Social engineering Content analysis Sender analysis	/feeds/core/detection-rules/cyrillic-vowel-substitutions-with-suspicious-subject-from-unknown-sender-10251c3c
Deceptive Dropbox mention	Sublime Security	1mo 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	7mo 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	1mo 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	1mo ago Jan 12th, 2026	Credential Phishing Social engineering Header analysis Sender analysis	/feeds/core/detection-rules/display-name-impersonation-using-recipient-sld-81a8ed12
Disposable sender email (unsolicited)	Sublime Security	3y ago Dec 7th, 2023	Sender analysis	/feeds/core/detection-rules/disposable-sender-email-unsolicited-5436b3db
DocuSign impersonation via CloudHQ links	Sublime Security	7mo 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	7mo 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	1mo 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	5mo 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: Payroll fraud	Sublime Security	7mo ago Aug 5th, 2025	BEC/Fraud Impersonation: Employee Free email provider Social engineering Content analysis Sender analysis	/feeds/core/detection-rules/employee-impersonation-payroll-fraud-2beb7d85
Employee impersonation with urgent request (untrusted sender)	Sublime Security	1mo 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
Encrypted Microsoft Office files from untrusted sender	Sublime Security	7mo ago Aug 5th, 2025	BEC/Fraud Callback Phishing Credential Phishing Extortion Malware/Ransomware Spam Encryption Evasion File analysis YARA Sender analysis	/feeds/core/detection-rules/encrypted-microsoft-office-files-from-untrusted-sender-eb7b26e7
Extortion / sextortion in attachment from untrusted sender	Sublime Security	7mo ago Aug 5th, 2025	Extortion Social engineering Spoofing Computer Vision Content analysis File analysis Natural Language Understanding Optical Character Recognition Sender analysis	/feeds/core/detection-rules/extortion-sextortion-in-attachment-from-untrusted-sender-3cb8d32c
Extortion / sextortion (untrusted sender)	Sublime Security	1mo 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 email quarantine notification	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Social engineering Content analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/fake-email-quarantine-notification-73f26a3d
Fake message thread - Untrusted sender with a mismatched freemail reply-to address	Sublime Security	1mo 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	3mo 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 request for tax preparation	Sublime Security	1mo ago Jan 12th, 2026	BEC/Fraud Malware/Ransomware Social engineering Content analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/fake-request-for-tax-preparation-e36b85b3
Fake scan-to-email message	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Free file host Social engineering Content analysis Optical Character Recognition Sender analysis URL analysis	/feeds/core/detection-rules/fake-scan-to-email-message-78851fbe
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	1mo 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 voicemail notification (untrusted sender)	Sublime Security	1mo ago Jan 22nd, 2026	Credential Phishing Social engineering Content analysis Natural Language Understanding Sender analysis URL analysis	/feeds/core/detection-rules/fake-voicemail-notification-untrusted-sender-74ba7787
Fake Zoom meeting invite with suspicious link	Sublime Security	3mo 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 from suspicious sender domain	Sublime Security	25d ago Feb 13th, 2026	Credential Phishing Malware/Ransomware Free file host Sender analysis URL analysis	/feeds/core/detection-rules/file-sharing-link-from-suspicious-sender-domain-95f20354
File sharing link with a suspicious subject	Sublime Security	21d ago Feb 17th, 2026	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	7mo 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
Fraudulent order confirmation/shipping notification from Chinese sender domain	Sublime Security	1mo ago Jan 12th, 2026	BEC/Fraud Social engineering Content analysis Natural Language Understanding Sender analysis Whois	/feeds/core/detection-rules/fraudulent-order-confirmationshipping-notification-from-chinese-sender-domain-4392a14e
Free email provider sender with mismatched provider reply-to	Sublime Security	7mo 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 login or captcha (untrusted sender)	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Free subdomain host Social engineering Computer Vision File analysis Sender analysis URL screenshot	/feeds/core/detection-rules/free-subdomain-link-with-login-or-captcha-untrusted-sender-93288f82
Generic service abuse from newly registered domain	Sublime Security	7mo 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 Accelerated Mobile Pages (AMP) abuse	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Impersonation: Brand Open redirect Computer Vision Content analysis Natural Language Understanding Optical Character Recognition Sender analysis URL analysis URL screenshot	/feeds/core/detection-rules/google-accelerated-mobile-pages-amp-abuse-46907029
Google Drive abuse: Credential phishing link	Sublime Security	2y ago Jul 31st, 2024	Credential Phishing Free file host Impersonation: Brand Computer Vision Natural Language Understanding Optical Character Recognition Sender analysis URL analysis URL screenshot	/feeds/core/detection-rules/google-drive-abuse-credential-phishing-link-c74aece0
Google Drive direct download link from unsolicited sender	Sublime Security	7mo ago Jul 16th, 2025	Malware/Ransomware Credential Phishing Evasion Social engineering Free file host URL analysis Sender analysis Content analysis	/feeds/core/detection-rules/google-drive-direct-download-link-from-unsolicited-sender-78a19343
Google Notification alert link from non-Google sender	Sublime Security	1mo 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	1mo 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	1mo 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	1mo 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	3mo 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: System account impersonation with empty sender address	Sublime Security	1mo 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
Honorific greeting BEC attempt with sender and reply-to mismatch	Sublime Security	1mo 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	1mo 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
HTML smuggling containing recipient email address	Sublime Security	4mo ago Nov 4th, 2025	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis File analysis Sender analysis	/feeds/core/detection-rules/html-smuggling-containing-recipient-email-address-af32ff2f
Impersonation: Chrome Web Store policy	Sublime Security	7mo 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
Impersonation: Executive using numbered local part	Sublime Security	1mo ago Jan 30th, 2026	BEC/Fraud Free email provider Impersonation: VIP Social engineering Header analysis Sender analysis	/feeds/core/detection-rules/impersonation-executive-using-numbered-local-part-8e005a22

618 Rules

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