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
Service abuse: Dropbox 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-dropbox-share-with-suspicious-sender-or-document-name-27007c9f
Service Abuse: ExactTarget with suspicious sender indicators	Sublime Security	4mo ago Nov 8th, 2025	Credential Phishing BEC/Fraud Evasion Social engineering Header analysis Sender analysis	/feeds/core/detection-rules/service-abuse-exacttarget-with-suspicious-sender-indicators-6154f197
Service abuse: FlipHTML5 with attachment deception and credential theft language	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Social engineering Free file host Evasion Content analysis Natural Language Understanding URL analysis	/feeds/core/detection-rules/service-abuse-fliphtml5-with-attachment-deception-and-credential-theft-language-02464799
Service abuse: Free provider with SendGrid routing	Sublime Security	2mo ago Jan 8th, 2026	Credential Phishing Free email provider Evasion Header analysis Sender analysis	/feeds/core/detection-rules/service-abuse-free-provider-with-sendgrid-routing-3079cacb
Service Abuse: GoDaddy infrastructure	Sublime Security	2mo ago Jan 7th, 2026	Callback Phishing Extortion Evasion Natural Language Understanding Content analysis	/feeds/core/detection-rules/service-abuse-godaddy-infrastructure-8a2dd357
Service abuse: Google application integration redirecting to suspicious hosts	Sublime Security	2mo ago Dec 17th, 2025	Credential Phishing Malware/Ransomware Evasion Free file host Free subdomain host Open redirect Header analysis Sender analysis URL analysis	/feeds/core/detection-rules/service-abuse-google-application-integration-redirecting-to-suspicious-hosts-473d3247
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
Service abuse: HungerRush domain with SendGrid tracking targeting ProtonMail	Sublime Security	6d ago Mar 4th, 2026	BEC/Fraud Evasion Sender analysis HTML analysis Content analysis	/feeds/core/detection-rules/service-abuse-hungerrush-domain-with-sendgrid-tracking-targeting-protonmail-73f62e74
Service abuse: Monday.com infrastructure with phishing intent	Sublime Security	20h ago Mar 9th, 2026	Credential Phishing Evasion Social engineering QR code Content analysis File analysis Header analysis QR code analysis Sender analysis URL analysis	/feeds/core/detection-rules/service-abuse-mondaycom-infrastructure-with-phishing-intent-a346e3b1
Service abuse: Nylas tracking subdomain with suspicious content	Sublime Security	4d ago Mar 6th, 2026	BEC/Fraud Credential Phishing Evasion Social engineering Content analysis Natural Language Understanding URL analysis	/feeds/core/detection-rules/service-abuse-nylas-tracking-subdomain-with-suspicious-content-a3a6c896
Service abuse: Payoneer callback scam	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-payoneer-callback-scam-b7fb174c
Service abuse: QuickBooks notification from new domain	Sublime Security	1mo ago Jan 12th, 2026	Callback Phishing Credential Phishing BEC/Fraud Evasion Social engineering Content analysis Sender analysis Header analysis	/feeds/core/detection-rules/service-abuse-quickbooks-notification-from-new-domain-c4f46473
Service abuse: QuickBooks notification with suspicious comments	Sublime Security	1mo ago Jan 12th, 2026	Callback Phishing Credential Phishing BEC/Fraud Evasion Social engineering Content analysis Sender analysis Header analysis	/feeds/core/detection-rules/service-abuse-quickbooks-notification-with-suspicious-comments-a23d0950
Service abuse: SendGrid-formatted link with actor-controlled fragment	Sublime Security	3mo ago Nov 24th, 2025	Credential Phishing Evasion Social engineering Content analysis URL analysis	/feeds/core/detection-rules/service-abuse-sendgrid-formatted-link-with-actor-controlled-fragment-cb511fe9
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: Wix redirect through bulk mailer domains	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Evasion Open redirect URL analysis Sender analysis	/feeds/core/detection-rules/service-abuse-wix-redirect-through-bulk-mailer-domains-60af216d
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 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
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 photo share	Sublime Security	4mo ago Nov 8th, 2025	Spam Evasion Social engineering Content analysis Sender analysis URL analysis Whois	/feeds/core/detection-rules/spam-fake-photo-share-eb086f7d
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/fraud: Predatory journal/research paper request	Sublime Security	4mo ago Nov 3rd, 2025	BEC/Fraud Spam Social engineering Impersonation: Brand Lookalike domain Evasion Natural Language Understanding Content analysis Sender analysis URL analysis Whois	/feeds/core/detection-rules/spamfraud-predatory-journalresearch-paper-request-263ca56b
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: Unsolicited malformed PDF	Sublime Security	7mo ago Jul 16th, 2025	Spam Evasion Free email provider PDF Content analysis File analysis Sender analysis	/feeds/core/detection-rules/spam-unsolicited-malformed-pdf-f0c50031
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
Suspected cross-site scripting (XSS) found in subject	Sublime Security	6mo ago Sep 4th, 2025	Credential Phishing Evasion Scripting Content analysis Sender analysis	/feeds/core/detection-rules/suspected-cross-site-scripting-xss-found-in-subject-8a946cfa
Suspected lookalike domain with suspicious language	Sublime Security	1mo ago Jan 12th, 2026	BEC/Fraud Evasion Lookalike domain Social engineering Content analysis Natural Language Understanding Sender analysis Whois	/feeds/core/detection-rules/suspected-lookalike-domain-with-suspicious-language-3674ced0
Suspicious attachment: Duplicate decoy PDF files	Sublime Security	7mo ago Aug 5th, 2025	Credential Phishing Evasion PDF File analysis Optical Character Recognition	/feeds/core/detection-rules/suspicious-attachment-duplicate-decoy-pdf-files-79b9b2e7
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 link to Looker Studio (lookerstudio.google.com) from a new and unsolicited sender	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Evasion Social engineering Content analysis Sender analysis URL analysis	/feeds/core/detection-rules/suspicious-link-to-looker-studio-lookerstudiogooglecom-from-a-new-and-unsolicited-sender-dbb50cb4
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 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 sender display name with long procedurally generated text blob	Sublime Security	7mo ago Jul 16th, 2025	Credential Phishing Evasion Content analysis Sender analysis	/feeds/core/detection-rules/suspicious-sender-display-name-with-long-procedurally-generated-text-blob-2a40b043
Suspicious subject with long procedurally generated text blob	Sublime Security	1mo ago Jan 12th, 2026	Credential Phishing Spam Evasion Content analysis Sender analysis	/feeds/core/detection-rules/suspicious-subject-with-long-procedurally-generated-text-blob-e819593d
Truth Social infrastructure abuse via link redirect	Sublime Security	7mo ago Jul 16th, 2025	Credential Phishing Malware/Ransomware Spam Evasion Impersonation: Brand Social engineering Content analysis Sender analysis URL analysis	/feeds/core/detection-rules/truth-social-infrastructure-abuse-via-link-redirect-aaaa30a8
Twitter infrastructure abuse via link shortener	Sublime Security	7mo ago Jul 16th, 2025	Credential Phishing Malware/Ransomware Spam Evasion Impersonation: Brand Social engineering Content analysis Sender analysis URL analysis	/feeds/core/detection-rules/twitter-infrastructure-abuse-via-link-shortener-99ca165e
Unicode QR code	Sublime Security	6mo ago Aug 25th, 2025	Credential Phishing Evasion Content analysis Sender analysis QR code analysis	/feeds/core/detection-rules/unicode-qr-code-1a0bdd25
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
URI protocol handler: search-ms	Sublime Security	1mo ago Jan 12th, 2026	Malware/Ransomware Evasion File analysis HTML analysis	/feeds/core/detection-rules/uri-protocol-handler-search-ms-ee27d9c0
URL with Unicode U+2044 (⁄) or U+2215 (∕) characters	@delivr_to	1mo ago Jan 12th, 2026	Credential Phishing Evasion Social engineering Content analysis URL analysis	/feeds/core/detection-rules/url-with-unicode-u2044-or-u2215-characters-12069f5b
Vendor compromise: GovDelivery message with suspicious link	Sublime Security	7mo ago Aug 5th, 2025	Credential Phishing Malware/Ransomware Free subdomain host IPFS Social engineering Evasion Impersonation: Brand Natural Language Understanding URL analysis Whois	/feeds/core/detection-rules/vendor-compromise-govdelivery-message-with-suspicious-link-0d2d5172
Venmo payment request abuse	Sublime Security	6mo ago Sep 5th, 2025	Callback Phishing BEC/Fraud Social engineering Impersonation: Brand Evasion Natural Language Understanding Content analysis Sender analysis HTML analysis	/feeds/core/detection-rules/venmo-payment-request-abuse-4450639a
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

351 Rules

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