Sublime Security

Sublime Core Feed
HTML analysis
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Attack Types
BEC/Fraud
Callback Phishing
Credential Phishing
Extortion
Malware/Ransomware
Reconnaissance
Spam
Tactics and Techniques
Encryption
Evasion
Exploit
Free email provider
Free file host
Free subdomain host
HTML smuggling
ICS Phishing
Image as content
Impersonation: Brand
Impersonation: Employee
Impersonation: VIP
IPFS
ISO
LNK
Lookalike domain
Macros
OneNote
Open redirect
Out of band pivot
PDF
Punycode
QR code
Scripting
Social engineering
Spoofing
Detection Methods
Archive analysis
Content analysis
Computer Vision
Exif analysis
File analysis
Header analysis
HTML analysis
Javascript analysis
Macro analysis
Natural Language Understanding
Optical Character Recognition
OLE analysis
PDF analysis
QR code analysis
Sender analysis
Threat intelligence
URL analysis
URL screenshot
Whois
XML analysis
YARA
Detection Method: HTML analysis
HTML analysis looks at the HTML code in emails, web pages, or attachments to spot potentially malicious elements or deceptive structures. It examines both what’s visible and hidden in the HTML to uncover tactics often used in phishing or malware attacks.
HTML analysis can help you detect:
Hidden scripts or iframes that might run harmful code
Obfuscated JavaScript designed to avoid detection
Misleading hyperlinks where the displayed text doesn’t match the real URL
Forms made to steal credentials or sensitive data
Suspicious HTML comments with hidden instructions
CSS tricks used to hide malicious content
For example, phishing emails often use HTML to replicate trusted login pages. HTML analysis can catch the hidden forms and scripts trying to steal your credentials.
Blog Posts
Talking phish over turkey · Blog · Sublime Security
Living Off the Land: Credential Phishing via Docusign abuse · Blog · Sublime Security
Call Me Maybe? The Rise of Callback Phishing Emails · Blog · Sublime Security
Attack Types (6):
Credential Phishing
Malware/Ransomware
BEC/Fraud
Callback Phishing
Extortion
Spam
Tactics & Techniques (23):
Impersonation: Brand
Social engineering
Evasion
HTML smuggling
Free file host
Spoofing
Open redirect
Impersonation: VIP
Impersonation: Employee
Free subdomain host
Image as content
Out of band pivot
Scripting
Lookalike domain
OneNote
PDF
ICS Phishing
Exploit
Free email provider
Credential Phishing
Encryption
HTML injection
ISO
Rule Name & Severity
Last Updated
Types, Tactics & Capabilities
Brand impersonation: Partiful
3h ago
Oct 26th, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Social engineering
Content analysis
HTML analysis
URL analysis
Credential Phishing
Impersonation: Brand
Social engineering
Content analysis
HTML analysis
URL analysis
Attachment: EML file with HTML attachment (unsolicited)
4d ago
Oct 23rd, 2026
Sublime Security
Credential Phishing
Malware/Ransomware
Evasion
HTML smuggling
Content analysis
File analysis
Header analysis
HTML analysis
Sender analysis
Credential Phishing
Malware/Ransomware
Evasion
HTML smuggling
Content analysis
File analysis
Header analysis
HTML analysis
Sender analysis
Credential phishing: Suspicious e-sign agreement document notification
5d ago
Oct 22nd, 2026
Sublime Security
Credential Phishing
Social engineering
Content analysis
Header analysis
HTML analysis
URL analysis
Sender analysis
Credential Phishing
Social engineering
Content analysis
Header analysis
HTML analysis
URL analysis
Sender analysis
Prompt injection: Hidden instructions to an AI in body HTML
6d ago
Oct 21st, 2026
Sublime Security
BEC/Fraud
Evasion
Social engineering
Content analysis
HTML analysis
Natural Language Understanding
Sender analysis
BEC/Fraud
Evasion
Social engineering
Content analysis
HTML analysis
Natural Language Understanding
Sender analysis
Body: HTML whitespace stuffing with short initial message
7d ago
Oct 20th, 2026
Sublime Security
Credential Phishing
Evasion
Social engineering
Content analysis
HTML analysis
Header analysis
Credential Phishing
Evasion
Social engineering
Content analysis
HTML analysis
Header analysis
Service abuse: Filemail file-sharing notifications
11d ago
Oct 16th, 2026
Sublime Security
Malware/Ransomware
BEC/Fraud
Free file host
Social engineering
Spoofing
Header analysis
HTML analysis
Content analysis
Malware/Ransomware
BEC/Fraud
Free file host
Social engineering
Spoofing
Header analysis
HTML analysis
Content analysis
Link: Self-service platform link to Microsoft login redirect
13d ago
Oct 14th, 2026
Sublime Security
Credential Phishing
Open redirect
Social engineering
URL analysis
HTML analysis
Content analysis
Credential Phishing
Open redirect
Social engineering
URL analysis
HTML analysis
Content analysis
Brand impersonation: Microsoft Teams invitation
18d ago
Oct 9th, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Social engineering
Content analysis
Header analysis
HTML analysis
URL analysis
Credential Phishing
Impersonation: Brand
Social engineering
Content analysis
Header analysis
HTML analysis
URL analysis
Service abuse: Trello board invitation with VIP impersonation
18d ago
Oct 9th, 2026
Sublime Security
Credential Phishing
Impersonation: VIP
Social engineering
Content analysis
Header analysis
HTML analysis
Sender analysis
Credential Phishing
Impersonation: VIP
Social engineering
Content analysis
Header analysis
HTML analysis
Sender analysis
Link: Credential phishing with cloaked content
19d ago
Oct 8th, 2026
Sublime Security
Credential Phishing
Evasion
Social engineering
URL analysis
HTML analysis
Natural Language Understanding
Content analysis
Credential Phishing
Evasion
Social engineering
URL analysis
HTML analysis
Natural Language Understanding
Content analysis
Spoofing: Hidden Outlook headers in self-addressed forwards
21d ago
Oct 6th, 2026
Sublime Security
BEC/Fraud
Credential Phishing
Spoofing
Evasion
Impersonation: Employee
Social engineering
Header analysis
HTML analysis
XML analysis
Sender analysis
Natural Language Understanding
BEC/Fraud
Credential Phishing
Spoofing
Evasion
Impersonation: Employee
Social engineering
Header analysis
HTML analysis
XML analysis
Sender analysis
Natural Language Understanding
Service abuse: Lovable-hosted redirect to external phishing page
21d ago
Oct 6th, 2026
Sublime Security
Credential Phishing
Social engineering
Open redirect
Free subdomain host
URL analysis
HTML analysis
Content analysis
Credential Phishing
Social engineering
Open redirect
Free subdomain host
URL analysis
HTML analysis
Content analysis
Attachment: Fake email body embedded in inline image
22d ago
Oct 5th, 2026
Sublime Security
Credential Phishing
Image as content
Social engineering
Evasion
Optical Character Recognition
Natural Language Understanding
HTML analysis
Header analysis
Sender analysis
Credential Phishing
Image as content
Social engineering
Evasion
Optical Character Recognition
Natural Language Understanding
HTML analysis
Header analysis
Sender analysis
Attachment: Suspicious use of Unicode tag characters in ICS File
23d ago
Oct 4th, 2026
Sublime Security
BEC/Fraud
Credential Phishing
Evasion
Social engineering
Content analysis
HTML analysis
Header analysis
BEC/Fraud
Credential Phishing
Evasion
Social engineering
Content analysis
HTML analysis
Header analysis
Evasion: Suspicious use of Unicode tag characters
23d ago
Oct 4th, 2026
Sublime Security
BEC/Fraud
Credential Phishing
Evasion
Social engineering
Content analysis
HTML analysis
Header analysis
BEC/Fraud
Credential Phishing
Evasion
Social engineering
Content analysis
HTML analysis
Header analysis
Body: Bid solicitation PDF lure
25d ago
Oct 2nd, 2026
Sublime Security
BEC/Fraud
Social engineering
Content analysis
HTML analysis
BEC/Fraud
Social engineering
Content analysis
HTML analysis
Service abuse: Self-service platform redirecting to newly registered suspicious domain
26d ago
Oct 1st, 2026
Sublime Security
Credential Phishing
Out of band pivot
Evasion
URL analysis
Whois
HTML analysis
Credential Phishing
Out of band pivot
Evasion
URL analysis
Whois
HTML analysis
Attachment: HTML smuggling with dynamically constructed redirect URL
28d ago
Sep 29th, 2026
Sublime Security
Credential Phishing
HTML smuggling
Evasion
Impersonation: Brand
Social engineering
Scripting
HTML analysis
Javascript analysis
File analysis
Credential Phishing
HTML smuggling
Evasion
Impersonation: Brand
Social engineering
Scripting
HTML analysis
Javascript analysis
File analysis
Brand impersonation: Fake DocuSign HTML table not linking to DocuSign domains
29d ago
Sep 28th, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Social engineering
Content analysis
HTML analysis
Header analysis
Sender analysis
URL analysis
Credential Phishing
Impersonation: Brand
Social engineering
Content analysis
HTML analysis
Header analysis
Sender analysis
URL analysis
Brand impersonation: Microsoft logo in HTML with fake quarantine release notification
29d ago
Sep 28th, 2026
Sublime Security
Credential Phishing
Evasion
Impersonation: Brand
Social engineering
Content analysis
HTML analysis
Sender analysis
Credential Phishing
Evasion
Impersonation: Brand
Social engineering
Content analysis
HTML analysis
Sender analysis
Page 1 of 9

Rule Name & Severity	Last Updated	Author	Types, Tactics & Capabilities
Brand impersonation: Partiful	3h ago Oct 26th, 2026	Sublime Security	Credential Phishing Impersonation: Brand Social engineering Content analysis HTML analysis URL analysis
Attachment: EML file with HTML attachment (unsolicited)	4d ago Oct 23rd, 2026	Sublime Security	Credential Phishing Malware/Ransomware Evasion HTML smuggling Content analysis File analysis Header analysis HTML analysis Sender analysis
Credential phishing: Suspicious e-sign agreement document notification	5d ago Oct 22nd, 2026	Sublime Security	Credential Phishing Social engineering Content analysis Header analysis HTML analysis URL analysis Sender analysis
Prompt injection: Hidden instructions to an AI in body HTML	6d ago Oct 21st, 2026	Sublime Security	BEC/Fraud Evasion Social engineering Content analysis HTML analysis Natural Language Understanding Sender analysis
Body: HTML whitespace stuffing with short initial message	7d ago Oct 20th, 2026	Sublime Security	Credential Phishing Evasion Social engineering Content analysis HTML analysis Header analysis
Service abuse: Filemail file-sharing notifications	11d ago Oct 16th, 2026	Sublime Security	Malware/Ransomware BEC/Fraud Free file host Social engineering Spoofing Header analysis HTML analysis Content analysis
Link: Self-service platform link to Microsoft login redirect	13d ago Oct 14th, 2026	Sublime Security	Credential Phishing Open redirect Social engineering URL analysis HTML analysis Content analysis
Brand impersonation: Microsoft Teams invitation	18d ago Oct 9th, 2026	Sublime Security	Credential Phishing Impersonation: Brand Social engineering Content analysis Header analysis HTML analysis URL analysis
Service abuse: Trello board invitation with VIP impersonation	18d ago Oct 9th, 2026	Sublime Security	Credential Phishing Impersonation: VIP Social engineering Content analysis Header analysis HTML analysis Sender analysis
Link: Credential phishing with cloaked content	19d ago Oct 8th, 2026	Sublime Security	Credential Phishing Evasion Social engineering URL analysis HTML analysis Natural Language Understanding Content analysis
Spoofing: Hidden Outlook headers in self-addressed forwards	21d ago Oct 6th, 2026	Sublime Security	BEC/Fraud Credential Phishing Spoofing Evasion Impersonation: Employee Social engineering Header analysis HTML analysis XML analysis Sender analysis Natural Language Understanding
Service abuse: Lovable-hosted redirect to external phishing page	21d ago Oct 6th, 2026	Sublime Security	Credential Phishing Social engineering Open redirect Free subdomain host URL analysis HTML analysis Content analysis
Attachment: Fake email body embedded in inline image	22d ago Oct 5th, 2026	Sublime Security	Credential Phishing Image as content Social engineering Evasion Optical Character Recognition Natural Language Understanding HTML analysis Header analysis Sender analysis
Attachment: Suspicious use of Unicode tag characters in ICS File	23d ago Oct 4th, 2026	Sublime Security	BEC/Fraud Credential Phishing Evasion Social engineering Content analysis HTML analysis Header analysis
Evasion: Suspicious use of Unicode tag characters	23d ago Oct 4th, 2026	Sublime Security	BEC/Fraud Credential Phishing Evasion Social engineering Content analysis HTML analysis Header analysis
Body: Bid solicitation PDF lure	25d ago Oct 2nd, 2026	Sublime Security	BEC/Fraud Social engineering Content analysis HTML analysis
Service abuse: Self-service platform redirecting to newly registered suspicious domain	26d ago Oct 1st, 2026	Sublime Security	Credential Phishing Out of band pivot Evasion URL analysis Whois HTML analysis
Attachment: HTML smuggling with dynamically constructed redirect URL	28d ago Sep 29th, 2026	Sublime Security	Credential Phishing HTML smuggling Evasion Impersonation: Brand Social engineering Scripting HTML analysis Javascript analysis File analysis
Brand impersonation: Fake DocuSign HTML table not linking to DocuSign domains	29d ago Sep 28th, 2026	Sublime Security	Credential Phishing Impersonation: Brand Social engineering Content analysis HTML analysis Header analysis Sender analysis URL analysis
Brand impersonation: Microsoft logo in HTML with fake quarantine release notification	29d ago Sep 28th, 2026	Sublime Security	Credential Phishing Evasion Impersonation: Brand Social engineering Content analysis HTML analysis Sender analysis