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

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Tactic or Technique is

Rule Name & Severity	Author	Last Updated	Labels
Credential phishing link (unknown sender)	Sublime Security	7mo ago Jul 16th, 2025	Credential Phishing Social engineering Computer Vision Sender analysis URL analysis URL screenshot	/feeds/core/detection-rules/credential-phishing-link-unknown-sender-a278012b
Credential phishing: Onedrive impersonation	Sublime Security	1mo 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	4mo 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: 'Secure message' and engaging language	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Social engineering Natural Language Understanding Sender analysis	/feeds/core/detection-rules/credential-phishing-secure-message-and-engaging-language-bd95a7b1
Credential phishing: Suspicious e-sign agreement document notification	Sublime Security	1mo 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 subject with urgent financial request and link	Sublime Security	1mo 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	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
Credential theft with 'safe content' deception and social engineering topics	Sublime Security	13d ago Feb 25th, 2026	Credential Phishing Social engineering Evasion Content analysis Natural Language Understanding	/feeds/core/detection-rules/credential-theft-with-safe-content-deception-and-social-engineering-topics-22ceee0d
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
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
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 - PDF attachment leveraging breach data from freemail sender	Sublime Security	1y ago Feb 3rd, 2025	BEC/Fraud Free email provider PDF Social engineering QR code Content analysis File analysis QR code analysis	/feeds/core/detection-rules/extortion-sextortion-pdf-attachment-leveraging-breach-data-from-freemail-sender-efb5a213
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 warning banner using confusable characters	Sublime Security	8d ago Mar 2nd, 2026	BEC/Fraud Credential Phishing Evasion Social engineering Content analysis	/feeds/core/detection-rules/fake-warning-banner-using-confusable-characters-179ee1ff
Fake Zoho Sign template abuse	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Evasion Open redirect Social engineering Content analysis HTML analysis URL analysis	/feeds/core/detection-rules/fake-zoho-sign-template-abuse-785fd0d5
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 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 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 presentation open redirect phishing	Sublime Security	2mo ago Dec 11th, 2025	Credential Phishing Evasion Open redirect Social engineering URL analysis HTML analysis	/feeds/core/detection-rules/google-presentation-open-redirect-phishing-5d01ee3a
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: Bidirectional (BIDI) HTML override with right to left obfuscation	Sublime Security	4mo ago Oct 17th, 2025	BEC/Fraud Credential Phishing Evasion Social engineering Scripting Content analysis HTML analysis	/feeds/core/detection-rules/html-bidirectional-bidi-html-override-with-right-to-left-obfuscation-f93940d2
Image as content with a link to an open redirect (unsolicited)	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Evasion Image as content Open redirect Social engineering Content analysis HTML analysis URL analysis	/feeds/core/detection-rules/image-as-content-with-a-link-to-an-open-redirect-unsolicited-f5cec36b

510 Rules

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