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 6th, 2026

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GitHub

Rule Name & Severity	Author	Last Updated	Labels
Compensation review with QR code in attached EML	Sublime Security	3mo ago Nov 26th, 2025	Credential Phishing QR code Social engineering Computer Vision Content analysis Optical Character Recognition QR code analysis	/feeds/core/detection-rules/compensation-review-with-qr-code-in-attached-eml-98a2f03c
Credential phishing: Engaging language with IPFS link	Sublime Security	2y ago May 3rd, 2024	Credential Phishing Free file host Free subdomain host IPFS Content analysis Natural Language Understanding URL analysis	/feeds/core/detection-rules/credential-phishing-engaging-language-with-ipfs-link-996c4d83
Credential phishing: Fake password expiration from new and unsolicited sender	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Social engineering Content analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/credential-phishing-fake-password-expiration-from-new-and-unsolicited-sender-5d9c3a75
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: 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 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
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
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
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
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 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 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 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
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
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 with atob in message body	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware HTML smuggling Content analysis HTML analysis	/feeds/core/detection-rules/html-smuggling-with-atob-in-message-body-0f86851f
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: 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: Fake Gmail attachment	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Impersonation: Brand Content analysis File analysis Sender analysis	/feeds/core/detection-rules/impersonation-fake-gmail-attachment-0f5a4e14
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: Social Security Administration (SSA)	Sublime Security	1mo ago Jan 12th, 2026	BEC/Fraud Credential Phishing Impersonation: Brand Social engineering Content analysis Sender analysis URL analysis	/feeds/core/detection-rules/impersonation-social-security-administration-ssa-6196767e
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
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: Display text with excessive right-to-left mark characters	Sublime Security	1mo ago Jan 21st, 2026	Credential Phishing Evasion Content analysis URL analysis	/feeds/core/detection-rules/link-display-text-with-excessive-right-to-left-mark-characters-a45cfd4c
Link: File sharing pretext with suspicious body and link	Sublime Security	4mo ago Oct 10th, 2025	Credential Phishing Social engineering Evasion Natural Language Understanding Content analysis URL analysis HTML analysis	/feeds/core/detection-rules/link-file-sharing-pretext-with-suspicious-body-and-link-c5718a8e
Link: Microsoft impersonation using hosted png with suspicious link	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Impersonation: Brand Social engineering Content analysis Natural Language Understanding Sender analysis URL analysis	/feeds/core/detection-rules/link-microsoft-impersonation-using-hosted-png-with-suspicious-link-07c696d4
Link: PDF and financial display text to free file host	Sublime Security	5mo ago Sep 24th, 2025	Credential Phishing Free file host Free email provider Social engineering Content analysis Sender analysis URL analysis	/feeds/core/detection-rules/link-pdf-and-financial-display-text-to-free-file-host-b010740b
Link: Self-sender with sender org in subject and credential theft indicator	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Social engineering Evasion Natural Language Understanding Content analysis Sender analysis URL analysis Header analysis	/feeds/core/detection-rules/link-self-sender-with-sender-org-in-subject-and-credential-theft-indicator-bfa9aa08
Link: SharePoint OneNote or PDF link with self sender behavior	Sublime Security	9d ago Feb 27th, 2026	Credential Phishing Evasion Free file host OneNote PDF Header analysis URL analysis Sender analysis	/feeds/core/detection-rules/link-sharepoint-onenote-or-pdf-link-with-self-sender-behavior-588e7203
Link: Suspicious SharePoint document name	Sublime Security	23d ago Feb 13th, 2026	Credential Phishing Free file host Evasion Content analysis	/feeds/core/detection-rules/link-suspicious-sharepoint-document-name-f95fee6e
Link: Uncommon SharePoint document type with sender's display name	Sublime Security	7mo ago Aug 5th, 2025	Credential Phishing Social engineering OneNote PDF Content analysis Header analysis HTML analysis URL analysis	/feeds/core/detection-rules/link-uncommon-sharepoint-document-type-with-senders-display-name-02d290b2
Link: URL scheme obfuscation via split HTML anchors	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing BEC/Fraud Evasion HTML injection Social engineering Content analysis HTML analysis URL analysis	/feeds/core/detection-rules/link-url-scheme-obfuscation-via-split-html-anchors-10375948
Link: Zoho form link from unsolicited sender	Sublime Security	7mo ago Aug 5th, 2025	Callback Phishing Free file host Content analysis URL analysis Sender analysis	/feeds/core/detection-rules/link-zoho-form-link-from-unsolicited-sender-eb04a9f2
Microsoft device code phishing	@ajpc500	1mo ago Jan 12th, 2026	Credential Phishing Impersonation: Brand Social engineering Content analysis Sender analysis URL analysis	/feeds/core/detection-rules/microsoft-device-code-phishing-61f3ae67
Open redirect (go2.aspx) leading to Microsoft credential phishing	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Impersonation: Brand Open redirect Content analysis Header analysis URL analysis	/feeds/core/detection-rules/open-redirect-go2aspx-leading-to-microsoft-credential-phishing-51667096
Open Redirect: Google domain with /url path and suspicious indicators	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Evasion Open redirect Computer Vision Content analysis File analysis Header analysis Natural Language Understanding Optical Character Recognition Sender analysis URL analysis	/feeds/core/detection-rules/open-redirect-google-domain-with-url-path-and-suspicious-indicators-fc5adf74
Outlook hyperlink bypass: left-to-right mark (LRM) in base HTML tag	Sublime Security	2mo ago Dec 10th, 2025	Credential Phishing Evasion Exploit Content analysis HTML analysis URL analysis	/feeds/core/detection-rules/outlook-hyperlink-bypass-left-to-right-mark-lrm-in-base-html-tag-160cc681
PayPal invoice abuse	Sublime Security	25d ago Feb 11th, 2026	BEC/Fraud Callback Phishing Evasion Social engineering Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/paypal-invoice-abuse-0ff7a0d4
Potential prompt injection attack in body HTML	Sublime Security	1mo ago Jan 12th, 2026	Callback Phishing Credential Phishing Extortion Malware/Ransomware Spam BEC/Fraud Evasion Social engineering Header analysis HTML analysis Content analysis	/feeds/core/detection-rules/potential-prompt-injection-attack-in-body-html-5fb24736
QR Code with suspicious indicators	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing QR code Social engineering Content analysis Header analysis Computer Vision Natural Language Understanding QR code analysis Sender analysis URL analysis	/feeds/core/detection-rules/qr-code-with-suspicious-indicators-04f5c34f
Reconnaissance: All recipients cc/bcc'd or undisclosed	Sublime Security	1mo ago Feb 5th, 2026	Reconnaissance Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/reconnaissance-all-recipients-ccbccd-or-undisclosed-420f60d3
Reconnaissance: Empty message from uncommon sender	Sublime Security	11d ago Feb 25th, 2026	Spam Evasion Social engineering Content analysis Header analysis	/feeds/core/detection-rules/reconnaissance-empty-message-from-uncommon-sender-b347cdbc
Self-sent fake PDF attachment with misleading link	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Evasion Free subdomain host Social engineering Content analysis URL analysis Sender analysis	/feeds/core/detection-rules/self-sent-fake-pdf-attachment-with-misleading-link-8a285d2e
Service abuse: Adobe Creative Cloud share from an unsolicited sender address	Sublime Security	4mo ago Oct 22nd, 2025	Credential Phishing Social engineering Free file host Evasion HTML analysis Sender analysis Header analysis	/feeds/core/detection-rules/service-abuse-adobe-creative-cloud-share-from-an-unsolicited-sender-address-47e42ca1
Service abuse: Apple TestFlight with suspicious developer reference	Sublime Security	30d ago Feb 6th, 2026	Spam Social engineering Content analysis HTML analysis Natural Language Understanding Sender analysis URL analysis	/feeds/core/detection-rules/service-abuse-apple-testflight-with-suspicious-developer-reference-e7ea0ee0
Service abuse: Google classroom solicitation	Sublime Security	1mo ago Jan 12th, 2026	Callback Phishing BEC/Fraud Impersonation: Brand Out of band pivot Social engineering Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/service-abuse-google-classroom-solicitation-e9c39e92
Service abuse: HelloSign from an unsolicited sender address	Sublime Security	7mo ago Aug 5th, 2025	Credential Phishing Social engineering Free file host Evasion HTML analysis Sender analysis Header analysis	/feeds/core/detection-rules/service-abuse-hellosign-from-an-unsolicited-sender-address-68ca0753
Service Abuse: HelloSign share with suspicious sender or document name	Sublime Security	1mo ago Jan 12th, 2026	Callback Phishing BEC/Fraud Evasion Social engineering Sender analysis Header analysis Content analysis	/feeds/core/detection-rules/service-abuse-hellosign-share-with-suspicious-sender-or-document-name-464d98f3

122 Rules

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