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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Rule Name & Severity	Author	Last Updated	Labels
Credential phishing: Image as content, short or no body contents	Sublime Security	1mo 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: Suspicious language, link, recipients and other indicators	Sublime Security	7mo 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 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: Gophish abuse with hidden tracking image	Sublime Security	4mo ago Nov 5th, 2025	Spam Evasion Image as content Content analysis HTML analysis	/feeds/core/detection-rules/credential-theft-gophish-abuse-with-hidden-tracking-image-59915ceb
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
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
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
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
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
Fake shipping notification with suspicious language	Sublime Security	2y ago May 3rd, 2024	Credential Phishing Spam Evasion Content analysis Natural Language Understanding	/feeds/core/detection-rules/fake-shipping-notification-with-suspicious-language-67748b0a
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 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
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 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
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
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: 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	4mo ago Nov 6th, 2025	BEC/Fraud Credential Phishing Malware/Ransomware Evasion Spoofing Header analysis	/feeds/core/detection-rules/headers-outlook-express-mailer-b7a698de
Headers: risky-recover-production message ID	Sublime Security	12d ago Feb 26th, 2026	Spam Evasion Header analysis	/feeds/core/detection-rules/headers-risky-recover-production-message-id-4cc0b5dc
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
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
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
Impersonation: SharePoint reply header anomaly	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Social engineering Impersonation: Brand Evasion Spoofing Header analysis Content analysis Sender analysis	/feeds/core/detection-rules/impersonation-sharepoint-reply-header-anomaly-78875848
Impersonation: Suspected supplier impersonation with suspicious content	Sublime Security	1y ago Feb 3rd, 2025	BEC/Fraud Evasion Free email provider Lookalike domain Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis Whois	/feeds/core/detection-rules/impersonation-suspected-supplier-impersonation-with-suspicious-content-63d8b1ce
Inbound message from popular service via newly observed distribution list	Sublime Security	7mo ago Aug 5th, 2025	Callback Phishing Evasion Social engineering Header analysis Sender analysis	/feeds/core/detection-rules/inbound-message-from-popular-service-via-newly-observed-distribution-list-8f4bc148
Inline image as message with attachment or link	Sublime Security	7mo ago Jul 16th, 2025	Credential Phishing Evasion Image as content Content analysis HTML analysis URL analysis	/feeds/core/detection-rules/inline-image-as-message-with-attachment-or-link-823d7107
Issuu document with suspicious embedded link	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Social engineering Free file host Evasion URL analysis URL screenshot Natural Language Understanding Optical Character Recognition	/feeds/core/detection-rules/issuu-document-with-suspicious-embedded-link-0d73f43d
Link: 9WOLF phishkit initial landing URI	Sublime Security	1mo ago Jan 30th, 2026	Malware/Ransomware Evasion URL analysis Threat intelligence	/feeds/core/detection-rules/link-9wolf-phishkit-initial-landing-uri-a165e206
Link: Abused Adobe Express	Sublime Security	7mo ago Jul 23rd, 2025	Credential Phishing Evasion Free subdomain host Free file host Content analysis Sender analysis URL analysis Whois HTML analysis	/feeds/core/detection-rules/link-abused-adobe-express-c7d17bfd
Link: Adobe share from unsolicited sender	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Free file host Evasion Content analysis Sender analysis	/feeds/core/detection-rules/link-adobe-share-from-unsolicited-sender-8e29ab33
Link: Adobe share with suspicious indicators	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Evasion Free file host Content analysis URL screenshot Sender analysis Natural Language Understanding URL analysis	/feeds/core/detection-rules/link-adobe-share-with-suspicious-indicators-b33cae80
Link: Apple App Store malicious ad manager themed apps from free email provider	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing BEC/Fraud Malware/Ransomware Free email provider Social engineering Evasion Content analysis Sender analysis URL analysis	/feeds/core/detection-rules/link-apple-app-store-malicious-ad-manager-themed-apps-from-free-email-provider-9ce402c6
Link: Apple TestFlight from free email provider	Sublime Security	4mo ago Oct 17th, 2025	Credential Phishing Free email provider Evasion Sender analysis URL analysis	/feeds/core/detection-rules/link-apple-testflight-from-free-email-provider-9b447f1f
Link: Base64 encoded recipient address in URL fragment with hex subdomain	Sublime Security	1mo ago Jan 29th, 2026	Credential Phishing Evasion URL analysis Content analysis	/feeds/core/detection-rules/link-base64-encoded-recipient-address-in-url-fragment-with-hex-subdomain-781e86ae
Link: Base64 encoded recipient address in URL fragment with subject hash	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Encryption Evasion Social engineering Content analysis URL analysis Header analysis	/feeds/core/detection-rules/link-base64-encoded-recipient-address-in-url-fragment-with-subject-hash-eb9694b8
Link: Common hidden directory observed	Sublime Security	1mo ago Feb 3rd, 2026	Credential Phishing Evasion URL analysis HTML analysis	/feeds/core/detection-rules/link-common-hidden-directory-observed-9f316da6
Link: Credential phishing link with undisclosed recipients	Sublime Security	7mo ago Aug 5th, 2025	Credential Phishing Evasion Computer Vision Header analysis URL screenshot	/feeds/core/detection-rules/link-credential-phishing-link-with-undisclosed-recipients-06fc155e
Link: Credential theft with invisible Unicode character in page title from unsolicited sender	Sublime Security	25d ago Feb 13th, 2026	Credential Phishing Evasion Social engineering Natural Language Understanding Content analysis HTML analysis URL analysis URL screenshot	/feeds/core/detection-rules/link-credential-theft-with-invisible-unicode-character-in-page-title-from-unsolicited-sender-5fe14d53
Link: Cryptocurrency fraud with suspicious links	Sublime Security	3mo ago Dec 1st, 2025	BEC/Fraud Social engineering Evasion Free subdomain host Scripting Content analysis Header analysis Javascript analysis Natural Language Understanding Sender analysis URL analysis URL screenshot Whois	/feeds/core/detection-rules/link-cryptocurrency-fraud-with-suspicious-links-d0da37ce
Link: CVE-2024-21413 Microsoft Outlook Remote Code Execution Vulnerability	Sublime Security	2y ago Feb 15th, 2024	Malware/Ransomware Evasion Exploit URL analysis	/feeds/core/detection-rules/link-cve-2024-21413-microsoft-outlook-remote-code-execution-vulnerability-e8151426
Link: Direct download of executable file	Sublime Security	8d ago Mar 2nd, 2026	Malware/Ransomware Evasion Sender analysis URL analysis	/feeds/core/detection-rules/link-direct-download-of-executable-file-dbbfd077
Link: Direct link to gamma.app document with mode parameter	Sublime Security	7mo ago Aug 5th, 2025	Credential Phishing Malware/Ransomware Free file host Evasion URL analysis	/feeds/core/detection-rules/link-direct-link-to-gammaapp-document-with-mode-parameter-080ab581

351 Rules

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