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 Jan 23rd, 2026

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Rule Name & Severity	Author	Last Updated	Labels
Attachment: HTML smuggling with decimal encoding	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis HTML analysis	/feeds/core/detection-rules/attachment-html-smuggling-with-decimal-encoding-f99213c4
Attachment: HTML smuggling with embedded base64-encoded executable	Sublime Security	2y ago Mar 25th, 2024	Malware/Ransomware Evasion HTML smuggling Archive analysis File analysis HTML analysis YARA	/feeds/core/detection-rules/attachment-html-smuggling-with-embedded-base64-encoded-executable-b00c4527
Attachment: HTML smuggling with embedded base64-encoded ISO	Sublime Security	3y ago Aug 21st, 2023	Credential Phishing Malware/Ransomware Evasion HTML smuggling ISO Archive analysis Content analysis File analysis HTML analysis Sender analysis	/feeds/core/detection-rules/attachment-html-smuggling-with-embedded-base64-encoded-iso-294ecd2d
Attachment: HTML smuggling with eval and atob	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis HTML analysis Javascript analysis	/feeds/core/detection-rules/attachment-html-smuggling-with-eval-and-atob-9f521ca2
Attachment: HTML smuggling with eval and atob via calendar invite	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting File analysis HTML analysis Javascript analysis	/feeds/core/detection-rules/attachment-html-smuggling-with-eval-and-atob-via-calendar-invite-597c2edd
Attachment: HTML smuggling with excessive line break obfuscation	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Encryption Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis HTML analysis Javascript analysis	/feeds/core/detection-rules/attachment-html-smuggling-with-excessive-line-break-obfuscation-7e901440
Attachment: HTML smuggling with excessive string concatenation and suspicious patterns	Sublime Security	2y ago Aug 27th, 2024	Credential Phishing Evasion HTML smuggling Scripting Social engineering File analysis HTML analysis Javascript analysis	/feeds/core/detection-rules/attachment-html-smuggling-with-excessive-string-concatenation-and-suspicious-patterns-e34fce8d
Attachment: HTML smuggling with fromCharCode and other signals	Sublime Security	3y ago Aug 21st, 2023	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis Javascript analysis HTML analysis	/feeds/core/detection-rules/attachment-html-smuggling-with-fromcharcode-and-other-signals-a68ce0ef
Attachment: HTML smuggling with hex strings	@ajpc500	3y ago Aug 21st, 2023	Credential Phishing Malware/Ransomware Evasion HTML smuggling Archive analysis Content analysis File analysis HTML analysis Javascript analysis	/feeds/core/detection-rules/attachment-html-smuggling-with-hex-strings-b4208ed6
Attachment: HTML smuggling with high entropy and other signals	Sublime Security	3y ago Aug 21st, 2023	Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis HTML analysis	/feeds/core/detection-rules/attachment-html-smuggling-with-high-entropy-and-other-signals-be157288
Attachment: HTML smuggling with raw array buffer	Sublime Security	3y ago Aug 21st, 2023	Credential Phishing Malware/Ransomware Evasion Free subdomain host HTML smuggling Archive analysis Content analysis File analysis Javascript analysis	/feeds/core/detection-rules/attachment-html-smuggling-with-raw-array-buffer-a0d5c3dc
Attachment: HTML smuggling with RC4 decryption	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Encryption Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis HTML analysis Javascript analysis	/feeds/core/detection-rules/attachment-html-smuggling-with-rc4-decryption-3a46d765
Attachment: HTML smuggling with ROT13	@Kyle_Parrish_	11d ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Encryption Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis Javascript analysis HTML analysis	/feeds/core/detection-rules/attachment-html-smuggling-with-rot13-6eacc4cf
Attachment: HTML smuggling with setTimeout	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis Content analysis File analysis HTML analysis Javascript analysis	/feeds/core/detection-rules/attachment-html-smuggling-with-settimeout-4e0b2c32
Attachment: HTML smuggling with unescape	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Evasion HTML smuggling Scripting Archive analysis File analysis HTML analysis Javascript analysis	/feeds/core/detection-rules/attachment-html-smuggling-with-unescape-0b0fed36
Attachment: HTML with emoji-to-character map	Sublime Security	5mo ago Aug 5th, 2025	Credential Phishing Evasion HTML smuggling Impersonation: Brand Scripting Social engineering File analysis HTML analysis Javascript analysis Sender analysis	/feeds/core/detection-rules/attachment-html-with-emoji-to-character-map-3119d086
Attachment: HTML with hidden body	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Evasion Scripting Content analysis HTML analysis File analysis	/feeds/core/detection-rules/attachment-html-with-hidden-body-b059a781
Attachment: HTML with JavaScript functions for HTTP requests	Sublime Security	5mo ago Aug 5th, 2025	Credential Phishing Evasion Scripting Content analysis HTML analysis Javascript analysis File analysis	/feeds/core/detection-rules/attachment-html-with-javascript-functions-for-http-requests-01e679fd
Attachment: ICS calendar with embedded file from internal sender with SPF failure	Sublime Security	3mo ago Oct 22nd, 2025	Credential Phishing Spoofing Evasion File analysis Header analysis Sender analysis	/feeds/core/detection-rules/attachment-ics-calendar-with-embedded-file-from-internal-sender-with-spf-failure-d9ce9db8
Attachment: ICS file with non-Gregorian calendar scale	Sublime Security	2mo ago Nov 4th, 2025	Credential Phishing Evasion File analysis Content analysis	/feeds/core/detection-rules/attachment-ics-file-with-non-gregorian-calendar-scale-9315bbf5
Attachment: ICS with embedded document	Sublime Security	4mo ago Sep 22nd, 2025	Malware/Ransomware Evasion File analysis	/feeds/core/detection-rules/attachment-ics-with-embedded-document-8f9957d9
Attachment: JavaScript file with suspicious base64-encoded executable	Sublime Security	2y ago Apr 1st, 2024	Malware/Ransomware Evasion Scripting Archive analysis File analysis YARA	/feeds/core/detection-rules/attachment-javascript-file-with-suspicious-base64-encoded-executable-b8db0cf3
Attachment: Legal themed message or PDF with suspicious indicators	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Extortion BEC/Fraud Evasion PDF Social engineering Content analysis File analysis Natural Language Understanding Optical Character Recognition URL analysis Whois Header analysis Exif analysis	/feeds/core/detection-rules/attachment-legal-themed-message-or-pdf-with-suspicious-indicators-19133301
Attachment: Link file with UNC path	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Evasion LNK File analysis	/feeds/core/detection-rules/attachment-link-file-with-unc-path-3b7ee0fb
Attachment: Link to Doubleclick.net open redirect	Sublime Security	5mo ago Aug 5th, 2025	BEC/Fraud Credential Phishing Evasion Open redirect Social engineering Content analysis File analysis URL analysis	/feeds/core/detection-rules/attachment-link-to-doubleclicknet-open-redirect-506c16cc
Attachment: Macro files containing MHT content	Sublime Security	11d ago Jan 12th, 2026	Malware/Ransomware Credential Phishing Evasion Macros Scripting Archive analysis File analysis Macro analysis	/feeds/core/detection-rules/attachment-macro-files-containing-mht-content-4d54e40b
Attachment: Malformed OLE file	Sublime Security	2y ago Nov 25th, 2024	Credential Phishing Malware/Ransomware Evasion File analysis YARA	/feeds/core/detection-rules/attachment-malformed-ole-file-5aadc68f
Attachment: MSI installer file	@ajpc500	5mo ago Aug 5th, 2025	Malware/Ransomware Evasion Archive analysis File analysis	/feeds/core/detection-rules/attachment-msi-installer-file-ae17b1a9
Attachment: Office file contains OLE relationship to credential phishing page	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Evasion Social engineering File analysis HTML analysis Natural Language Understanding OLE analysis URL analysis	/feeds/core/detection-rules/attachment-office-file-contains-ole-relationship-to-credential-phishing-page-d55793d0
Attachment: Office file with credential phishing URLs	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Evasion Social engineering File analysis URL analysis Archive analysis Content analysis	/feeds/core/detection-rules/attachment-office-file-with-credential-phishing-urls-b2cae98d
Attachment: Office file with document sharing and browser instruction lures	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Social engineering Evasion Archive analysis File analysis Macro analysis Optical Character Recognition Content analysis	/feeds/core/detection-rules/attachment-office-file-with-document-sharing-and-browser-instruction-lures-b1250a4b
Attachment: Office file with suspicious function calls or downloaded file path	Sublime Security	11d ago Jan 12th, 2026	Malware/Ransomware Evasion Scripting Archive analysis File analysis	/feeds/core/detection-rules/attachment-office-file-with-suspicious-function-calls-or-downloaded-file-path-4c78b969
Attachment: OLE external relationship containing file scheme link to executable filetype	Sublime Security	2mo ago Nov 24th, 2025	Malware/Ransomware Evasion Archive analysis Content analysis OLE analysis Sender analysis	/feeds/core/detection-rules/attachment-ole-external-relationship-containing-file-scheme-link-to-executable-filetype-33bf6fd4
Attachment: OLE external relationship containing file scheme link to IP address	Sublime Security	11d ago Jan 12th, 2026	Malware/Ransomware Evasion Archive analysis Content analysis OLE analysis Sender analysis	/feeds/core/detection-rules/attachment-ole-external-relationship-containing-file-scheme-link-to-ip-address-3aab998c
Attachment: Password-protected PDF with fake document indicators	Sublime Security	2d ago Jan 21st, 2026	Malware/Ransomware Credential Phishing Encryption Evasion PDF File analysis YARA Exif analysis	/feeds/core/detection-rules/attachment-password-protected-pdf-with-fake-document-indicators-b45e4440
Attachment: PDF file with low reputation links to suspicious filetypes (unsolicited)	Sublime Security	11d ago Jan 12th, 2026	Malware/Ransomware Evasion PDF Archive analysis File analysis Sender analysis	/feeds/core/detection-rules/attachment-pdf-file-with-low-reputation-links-to-suspicious-filetypes-unsolicited-6144f880
Attachment: PDF file with low reputation link to ZIP file (unsolicited)	Michael Tingle	11d ago Jan 12th, 2026	Malware/Ransomware Evasion PDF Archive analysis File analysis Natural Language Understanding Sender analysis URL analysis	/feeds/core/detection-rules/attachment-pdf-file-with-low-reputation-link-to-zip-file-unsolicited-d1ee2859
Attachment: PDF generated with wkhtmltopdf tool and default title	Sublime Security	1mo ago Dec 19th, 2025	BEC/Fraud Callback Phishing Credential Phishing Malware/Ransomware PDF Evasion File analysis Exif analysis	/feeds/core/detection-rules/attachment-pdf-generated-with-wkhtmltopdf-tool-and-default-title-64e6c8a8
Attachment: PDF with link to DMG file download	Sublime Security	11d ago Jan 12th, 2026	Malware/Ransomware Evasion PDF Archive analysis Content analysis File analysis URL analysis	/feeds/core/detection-rules/attachment-pdf-with-link-to-dmg-file-download-2c486fe0
Attachment: PDF with link to zip containing a wsf file	Sublime Security	11d ago Jan 12th, 2026	Malware/Ransomware Evasion PDF Archive analysis Content analysis File analysis URL analysis	/feeds/core/detection-rules/attachment-pdf-with-link-to-zip-containing-a-wsf-file-93bc7db4
Attachment: PDF with suspicious HeadlessChrome metadata	Sublime Security	15d ago Jan 8th, 2026	Credential Phishing Malware/Ransomware Evasion PDF File analysis Exif analysis	/feeds/core/detection-rules/attachment-pdf-with-suspicious-headlesschrome-metadata-eda99b1d
Attachment: PDF with suspicious language and redirect to suspicious file type	Sublime Security	11d ago Jan 12th, 2026	Malware/Ransomware Credential Phishing Evasion PDF File analysis Natural Language Understanding Optical Character Recognition URL analysis	/feeds/core/detection-rules/attachment-pdf-with-suspicious-language-and-redirect-to-suspicious-file-type-adda3c3f
Attachment: Potential sandbox evasion in Office file	@ajpc500	11d ago Jan 12th, 2026	Malware/Ransomware Evasion Macros File analysis Macro analysis	/feeds/core/detection-rules/attachment-potential-sandbox-evasion-in-office-file-1c591681
Attachment: PowerPoint with suspicious hyperlink	Sublime Security	11d ago Jan 12th, 2026	Malware/Ransomware Evasion Scripting Exif analysis File analysis	/feeds/core/detection-rules/attachment-powerpoint-with-suspicious-hyperlink-0a999fb1
Attachment: QR code link with base64-encoded recipient address	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing QR code Image as content Social engineering Evasion PDF Macros Computer Vision File analysis Natural Language Understanding QR code analysis Sender analysis	/feeds/core/detection-rules/attachment-qr-code-link-with-base64-encoded-recipient-address-927a0c1a
Attachment: QR code with recipient targeting and special characters	Sublime Security	2d ago Jan 21st, 2026	Credential Phishing QR code Social engineering Evasion File analysis QR code analysis URL analysis Computer Vision	/feeds/core/detection-rules/attachment-qr-code-with-recipient-targeting-and-special-characters-fc9e1c09
Attachment: QR code with userinfo portion	Sublime Security	11d ago Jan 12th, 2026	Credential Phishing Malware/Ransomware Evasion Image as content PDF QR code QR code analysis File analysis Sender analysis	/feeds/core/detection-rules/attachment-qr-code-with-userinfo-portion-9d62cc5c
Attachment: RFC822 containing suspicious file sharing language with links from untrusted sender	Sublime Security	2mo ago Nov 4th, 2025	Credential Phishing Evasion Social engineering File analysis Header analysis Natural Language Understanding Sender analysis	/feeds/core/detection-rules/attachment-rfc822-containing-suspicious-file-sharing-language-with-links-from-untrusted-sender-d96854d7
Attachment: RTF file with suspicious link	Sublime Security	6mo ago Jul 23rd, 2025	Credential Phishing Evasion Archive analysis File analysis Sender analysis URL analysis	/feeds/core/detection-rules/attachment-rtf-file-with-suspicious-link-c848f9aa
Attachment: RTF with embedded content	@amitchell516	2y ago Feb 26th, 2024	Malware/Ransomware Evasion File analysis YARA	/feeds/core/detection-rules/attachment-rtf-with-embedded-content-61dd2dd7

313 Rules

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