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
Service abuse: Roomsy with unrelated body content	Sublime Security	3mo ago Dec 2nd, 2025	BEC/Fraud Credential Phishing Impersonation: Brand Social engineering Header analysis Sender analysis Natural Language Understanding	/feeds/core/detection-rules/service-abuse-roomsy-with-unrelated-body-content-18e08a5a
Service abuse: Sendgrid credential theft with personalized request targeting single recipient	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Social engineering Header analysis Natural Language Understanding Sender analysis Content analysis	/feeds/core/detection-rules/service-abuse-sendgrid-credential-theft-with-personalized-request-targeting-single-recipient-b9680da1
Service abuse: SendGrid impersonation via Sendgrid from new sender	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Impersonation: Brand Social engineering Header analysis Sender analysis	/feeds/core/detection-rules/service-abuse-sendgrid-impersonation-via-sendgrid-from-new-sender-aa5d18ca
Service abuse: SurveyMonkey survey from newly registered domain	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Evasion Free file host Social engineering Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/service-abuse-surveymonkey-survey-from-newly-registered-domain-50a85fa7
Service abuse: Suspicious Zoom Docs link	Sublime Security	3mo ago Dec 2nd, 2025	Credential Phishing Social engineering Free file host Evasion HTML analysis Sender analysis Header analysis	/feeds/core/detection-rules/service-abuse-suspicious-zoom-docs-link-064b2594
Service abuse: Task management message sent via SendGrid	Sublime Security	5mo ago Oct 6th, 2025	Credential Phishing Impersonation: Brand Social engineering Evasion Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/service-abuse-task-management-message-sent-via-sendgrid-568a63f5
Service abuse: Trello board invitation with VIP impersonation	Sublime Security	1mo ago Feb 3rd, 2026	Credential Phishing Impersonation: VIP Social engineering Content analysis Header analysis HTML analysis Sender analysis	/feeds/core/detection-rules/service-abuse-trello-board-invitation-with-vip-impersonation-fedfc94b
Sharepoint file share with suspicious recipients pattern	Sublime Security	2y ago Mar 27th, 2024	Credential Phishing Malware/Ransomware Evasion Content analysis Header analysis URL analysis	/feeds/core/detection-rules/sharepoint-file-share-with-suspicious-recipients-pattern-998a0826
Sharepoint link likely unrelated to sender	Sublime Security	1mo ago Jan 12th, 2026	BEC/Fraud Credential Phishing Impersonation: Employee Lookalike domain OneNote PDF Social engineering URL analysis Sender analysis Header analysis HTML analysis	/feeds/core/detection-rules/sharepoint-link-likely-unrelated-to-sender-6870f489
Sharepoint online with external recipients and external display name	@vector_sec	3y ago Aug 17th, 2023	Credential Phishing Spam Evasion Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/sharepoint-online-with-external-recipients-and-external-display-name-5579bb4b
SharePoint OTP for filename matching org name	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Impersonation: Brand Social engineering Content analysis Header analysis	/feeds/core/detection-rules/sharepoint-otp-for-filename-matching-org-name-89911cbd
Shopify infrastructure abuse	Sublime Security	2y ago Nov 13th, 2024	Credential Phishing Spam Evasion Free subdomain host Impersonation: Brand Social engineering Content analysis Header analysis URL analysis	/feeds/core/detection-rules/shopify-infrastructure-abuse-844ff164
Spam: BlackBaud infrastructure abuse	Sublime Security	2y ago Jan 17th, 2024	Spam Evasion Impersonation: Brand Image as content Social engineering Content analysis Header analysis	/feeds/core/detection-rules/spam-blackbaud-infrastructure-abuse-3db46591
Spam: Fake dating profile notification	Sublime Security	3mo ago Dec 3rd, 2025	Spam Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis	/feeds/core/detection-rules/spam-fake-dating-profile-notification-0f33fea2
Spam: Firebase password reset from suspicious sender	Sublime Security	3mo ago Dec 2nd, 2025	Credential Phishing Spam Evasion Social engineering Header analysis Sender analysis URL analysis	/feeds/core/detection-rules/spam-firebase-password-reset-from-suspicious-sender-a2f673a9
Spam: Link to blob.core.windows.net from new domain (<30d)	Sublime Security	7mo ago Jul 16th, 2025	Spam Free subdomain host Header analysis URL analysis Sender analysis	/feeds/core/detection-rules/spam-link-to-blobcorewindowsnet-from-new-domain-less30d-a09b3800
Spam: Mastercard promotional content with image-based body	Sublime Security	4mo ago Nov 5th, 2025	Credential Phishing Spam Image as content Impersonation: Brand Social engineering Computer Vision Content analysis Header analysis Natural Language Understanding Optical Character Recognition Sender analysis	/feeds/core/detection-rules/spam-mastercard-promotional-content-with-image-based-body-5f2cb559
Spam: Personalized subject and greetings via Salesforce Marketing Cloud	Sublime Security	4mo ago Nov 3rd, 2025	Spam Social engineering Content analysis Header analysis	/feeds/core/detection-rules/spam-personalized-subject-and-greetings-via-salesforce-marketing-cloud-c77f127f
Spam: Sendersrv.com with financial communications and unsubscribe language	Sublime Security	14d ago Feb 24th, 2026	Spam Evasion Social engineering Header analysis Content analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/spam-sendersrvcom-with-financial-communications-and-unsubscribe-language-69570820
Spam: Single recipient duplicated in cc	Sublime Security	1mo ago Jan 12th, 2026	Spam Impersonation: Brand Social engineering Header analysis Content analysis URL analysis Sender analysis	/feeds/core/detection-rules/spam-single-recipient-duplicated-in-cc-387cacc9
Spam: Unsolicited WordPress account creation or password reset request	Sublime Security	3mo ago Nov 24th, 2025	Spam Social engineering Header analysis Sender analysis URL analysis	/feeds/core/detection-rules/spam-unsolicited-wordpress-account-creation-or-password-reset-request-e182b6b2
SPF temp error	Sublime Security	1mo ago Jan 12th, 2026	Spoofing Header analysis	/feeds/core/detection-rules/spf-temp-error-2df7e839
Spoofable internal domain with suspicious signals	Sublime Security	7mo ago Jul 23rd, 2025	Credential Phishing Free file host Free subdomain host Social engineering Spoofing Content analysis Header analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/spoofable-internal-domain-with-suspicious-signals-40089d69
Stripe invoice abuse	Sublime Security	1mo ago Jan 12th, 2026	BEC/Fraud Callback Phishing PDF File analysis Header analysis	/feeds/core/detection-rules/stripe-invoice-abuse-90162d16
Subject and sender display name contains matching long alphanumeric string	Sublime Security	1mo ago Jan 12th, 2026	Malware/Ransomware Credential Phishing Evasion Social engineering Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/subject-and-sender-display-name-contains-matching-long-alphanumeric-string-a8a0c831
Subject: Suspicious bracketed reference	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Evasion Impersonation: Brand Header analysis Content analysis	/feeds/core/detection-rules/subject-suspicious-bracketed-reference-663dbce4
Suspicious attachment with unscannable Cloudflare link	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Evasion PDF Social engineering Impersonation: Employee Impersonation: VIP File analysis URL analysis Sender analysis Content analysis Header analysis Natural Language Understanding	/feeds/core/detection-rules/suspicious-attachment-with-unscannable-cloudflare-link-00f92b6f
Suspicious DocuSign share from new domain	Sublime Security	7mo ago Aug 5th, 2025	BEC/Fraud Credential Phishing Evasion Free file host Impersonation: Brand Social engineering Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/suspicious-docusign-share-from-new-domain-d430a1f3
Suspicious Links to Cloudflare R2 and Edge Services	Sublime Security	1mo ago Jan 12th, 2026	BEC/Fraud Callback Phishing Credential Phishing Extortion Malware/Ransomware Spam Free file host Header analysis Sender analysis URL analysis	/feeds/core/detection-rules/suspicious-links-to-cloudflare-r2-and-edge-services-5dd3e5c8
Suspicious mailer received from Gmail servers	Sublime Security	7mo ago Jul 16th, 2025	Callback Phishing Spam Free email provider Social engineering Header analysis	/feeds/core/detection-rules/suspicious-mailer-received-from-gmail-servers-f05f04ee
Suspicious message with unscannable Cloudflare link	Sublime Security	5mo ago Sep 22nd, 2025	Credential Phishing Content analysis Header analysis URL analysis Sender analysis	/feeds/core/detection-rules/suspicious-message-with-unscannable-cloudflare-link-70ea21f9
Suspicious message with unscannable Vercel link	Sublime Security	7mo ago Jul 16th, 2025	Credential Phishing Evasion Content analysis Header analysis Sender analysis URL analysis	/feeds/core/detection-rules/suspicious-message-with-unscannable-vercel-link-b5acffe7
Suspicious newly registered reply-to domain with engaging financial or urgent language	Sublime Security	1mo ago Jan 12th, 2026	BEC/Fraud Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis Whois	/feeds/core/detection-rules/suspicious-newly-registered-reply-to-domain-with-engaging-financial-or-urgent-language-db4d9bb3
Suspicious recipient pattern and language with low reputation link to login	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Social engineering Computer Vision Content analysis Header analysis Natural Language Understanding Optical Character Recognition Sender analysis URL analysis URL screenshot	/feeds/core/detection-rules/suspicious-recipient-pattern-and-language-with-low-reputation-link-to-login-a8ea0402
Suspicious recipients pattern with NLU credential theft indicators	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Evasion Content analysis Header analysis Natural Language Understanding URL analysis	/feeds/core/detection-rules/suspicious-recipients-pattern-with-nlu-credential-theft-indicators-8e121c3e
Suspicious recipients pattern with no Compauth pass and suspicious content	Sublime Security	1mo ago Jan 12th, 2026	Content analysis Computer Vision Header analysis Natural Language Understanding URL analysis URL screenshot	/feeds/core/detection-rules/suspicious-recipients-pattern-with-no-compauth-pass-and-suspicious-content-34fb65f6
Suspicious request for financial information	Sublime Security	3mo ago Dec 6th, 2025	BEC/Fraud Free email provider Impersonation: Employee Impersonation: VIP Social engineering Content analysis Header analysis Sender analysis	/feeds/core/detection-rules/suspicious-request-for-financial-information-4ebdaa4d
Suspicious SharePoint file sharing	Sublime Security	7mo ago Aug 5th, 2025	Credential Phishing Free email provider Free file host OneNote PDF Content analysis Header analysis Sender analysis URL analysis	/feeds/core/detection-rules/suspicious-sharepoint-file-sharing-971c3d9c
Tax Form: W-8BEN solicitation	Sublime Security	15d ago Feb 23rd, 2026	BEC/Fraud Credential Phishing Social engineering Content analysis Header analysis URL analysis	/feeds/core/detection-rules/tax-form-w-8ben-solicitation-a64edb69
Unusually long local part from untrusted sender address	Sublime Security	7mo ago Aug 5th, 2025	Credential Phishing Spam Evasion Header analysis Sender analysis	/feeds/core/detection-rules/unusually-long-local-part-from-untrusted-sender-address-91a9cd45
VIP / Executive impersonation in subject (untrusted)	Sublime Security	6mo ago Aug 14th, 2025	BEC/Fraud Impersonation: VIP Header analysis Sender analysis	/feeds/core/detection-rules/vip-executive-impersonation-in-subject-untrusted-0a641fe5
VIP / Executive impersonation (strict match, untrusted)	Sublime Security	13d ago Feb 25th, 2026	BEC/Fraud Impersonation: VIP Header analysis Sender analysis	/feeds/core/detection-rules/vip-executive-impersonation-strict-match-untrusted-e42c84b7
VIP impersonation: Fake thread with display name match, email mismatch	Sublime Security	1mo ago Jan 12th, 2026	BEC/Fraud Evasion Impersonation: VIP Social engineering Spoofing Content analysis Header analysis Sender analysis Whois	/feeds/core/detection-rules/vip-impersonation-fake-thread-with-display-name-match-email-mismatch-11cc3e28
VIP Impersonation via Google Group relay with suspicious indicators	Sublime Security	3mo ago Nov 12th, 2025	BEC/Fraud Credential Phishing Malware/Ransomware Evasion Free email provider Impersonation: Employee Social engineering Spoofing Content analysis Header analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/vip-impersonation-via-google-group-relay-with-suspicious-indicators-57f9cd3b
VIP impersonation with charitable donation fraud	Sublime Security	3mo ago Nov 12th, 2025	BEC/Fraud Impersonation: Employee Impersonation: VIP Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/vip-impersonation-with-charitable-donation-fraud-35a56b8e
VIP impersonation with invoicing request	Sublime Security	2y ago Apr 23rd, 2024	BEC/Fraud Impersonation: VIP Content analysis Header analysis Natural Language Understanding	/feeds/core/detection-rules/vip-impersonation-with-invoicing-request-a60f89a0
VIP impersonation with w2 request with reply-to mismatch	Sublime Security	11d ago Feb 27th, 2026	BEC/Fraud Impersonation: VIP Content analysis Header analysis Natural Language Understanding	/feeds/core/detection-rules/vip-impersonation-with-w2-request-with-reply-to-mismatch-e7e73fad
VIP local_part impersonation from unsolicited sender	Sublime Security	6mo ago Aug 12th, 2025	Impersonation: VIP Spoofing Header analysis Sender analysis	/feeds/core/detection-rules/vip-localpart-impersonation-from-unsolicited-sender-74035fdc
Xero infrastructure abuse	Sublime Security	4mo ago Nov 3rd, 2025	Credential Phishing Evasion Social engineering Content analysis Header analysis Natural Language Understanding URL analysis	/feeds/core/detection-rules/xero-infrastructure-abuse-918c4bd3
X (Twitter) impersonation with credential phishing motives	Sublime Security	7mo ago Aug 5th, 2025	Credential Phishing Impersonation: Brand Social engineering Computer Vision File analysis Header analysis Optical Character Recognition Natural Language Understanding Sender analysis	/feeds/core/detection-rules/x-twitter-impersonation-with-credential-phishing-motives-0b60dca6

351 Rules

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