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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 Apr 28th, 2025

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Rule Name & Severity	Author	Last Updated	Labels
Brand impersonation: DocuSign	Sublime Security	1mo ago Mar 28th, 2025	Credential Phishing Impersonation: Brand Lookalike domain Social engineering Spoofing Header analysis Sender analysis URL analysis	/feeds/core/detection-rules/brand-impersonation-docusign-4d29235c
Brand Impersonation: Navan	Sublime Security	26d ago Apr 4th, 2025	Credential Phishing Impersonation: Brand Social engineering Spoofing Sender analysis Natural Language Understanding URL analysis Content analysis	/feeds/core/detection-rules/brand-impersonation-navan-3573e9a8
Brand spoof: Dropbox	Sublime Security	1y ago Apr 23rd, 2024	Credential Phishing Malware/Ransomware Impersonation: Brand Spoofing Header analysis Sender analysis	/feeds/core/detection-rules/brand-spoof-dropbox-bd99740a
Business Email Compromise (BEC) attempt from unsolicited sender	Sublime Security	1y ago Apr 23rd, 2024	BEC/Fraud Social engineering Spoofing Content analysis File analysis Header analysis Sender analysis	/feeds/core/detection-rules/business-email-compromise-bec-attempt-from-unsolicited-sender-57eccc45
Cyrillic vowel substitution in subject or display name from unknown sender	Sublime Security	4mo ago Dec 19th, 2024	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
DocuSign Impersonation via Spoofed Intuit Sender	Sublime Security	1mo ago Mar 26th, 2025	Credential Phishing Impersonation: Brand Spoofing Header analysis Sender analysis	/feeds/core/detection-rules/docusign-impersonation-via-spoofed-intuit-sender-d437710b
Extortion / Sextortion in Attachment From Untrusted Sender	Sublime Security	4mo ago Dec 18th, 2024	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 (untrusted sender)	Sublime Security	1mo ago Mar 3rd, 2025	Extortion Social engineering Spoofing Content analysis Header analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/extortion-sextortion-untrusted-sender-265913eb
Impersonation: SharePoint Reply Header Anomaly	Sublime Security	1mo ago Mar 3rd, 2025	Credential Phishing Social engineering Impersonation: Brand Evasion Spoofing Header analysis Content analysis Sender analysis	/feeds/core/detection-rules/impersonation-sharepoint-reply-header-anomaly-78875848
SPF temp error	Sublime Security	2y ago Aug 21st, 2023	Spoofing Header analysis	/feeds/core/detection-rules/spf-temp-error-2df7e839
Spoofable internal domain with suspicious signals	Sublime Security	12mo ago May 3rd, 2024	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
VIP impersonation: Fake thread with display name match, email mismatch	Sublime Security	9mo ago Jul 29th, 2024	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	12mo ago May 3rd, 2024	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 local_part impersonation from unsolicited sender	Sublime Security	5mo ago Nov 20th, 2024	Impersonation: VIP Spoofing Header analysis Sender analysis	/feeds/core/detection-rules/vip-localpart-impersonation-from-unsolicited-sender-74035fdc