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
BEC/Fraud
Malware/Ransomware
Spam
Callback Phishing
Extortion
Tactics & Techniques (23):
Impersonation: Brand
Social engineering
Image as content
Evasion
PDF
Spoofing
Free file host
Lookalike domain
Free subdomain host
Free email provider
Scripting
HTML smuggling
Open redirect
Impersonation: VIP
Out of band pivot
ICS Phishing
Exploit
Credential Phishing
Encryption
HTML injection
Impersonation: Employee
OneNote
ISO
Rule Name & Severity
Last Updated
Types, Tactics & Capabilities
Impersonation: SAM/SBA federal registration
18m ago
Aug 27th, 2026
Sublime Security
Credential Phishing
BEC/Fraud
Impersonation: Brand
Social engineering
Image as content
Sender analysis
Content analysis
HTML analysis
Header analysis
Credential Phishing
BEC/Fraud
Impersonation: Brand
Social engineering
Image as content
Sender analysis
Content analysis
HTML analysis
Header analysis
Body: HTML whitespace stuffing with short initial message
2h ago
Aug 27th, 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
Body: CSS clamp() font obfuscation with suspicious URL
20h ago
Aug 26th, 2026
Sublime Security
Credential Phishing
Evasion
Social engineering
HTML analysis
URL analysis
Content analysis
Credential Phishing
Evasion
Social engineering
HTML analysis
URL analysis
Content analysis
Attachment: Risk assessment PDF with inline image
2d ago
Aug 25th, 2026
Sublime Security
Malware/Ransomware
Spam
Image as content
PDF
Social engineering
File analysis
HTML analysis
Header analysis
Sender analysis
Malware/Ransomware
Spam
Image as content
PDF
Social engineering
File analysis
HTML analysis
Header analysis
Sender analysis
Link: Credential harvesting with excess padding evasion
2d ago
Aug 25th, 2026
Sublime Security
Credential Phishing
Evasion
Social engineering
Content analysis
HTML analysis
Exif analysis
URL screenshot
Credential Phishing
Evasion
Social engineering
Content analysis
HTML analysis
Exif analysis
URL screenshot
Body: AI-generated invoice template artifacts
5d ago
Aug 22nd, 2026
Sublime Security
Credential Phishing
BEC/Fraud
Social engineering
Spoofing
Natural Language Understanding
HTML analysis
Header analysis
Sender analysis
Credential Phishing
BEC/Fraud
Social engineering
Spoofing
Natural Language Understanding
HTML analysis
Header analysis
Sender analysis
Brand impersonation: Microsoft logo image linking to free file host
6d ago
Aug 21st, 2026
Sublime Security
Credential Phishing
Malware/Ransomware
Impersonation: Brand
Image as content
Free file host
Social engineering
Computer Vision
Optical Character Recognition
Exif analysis
HTML analysis
URL analysis
Credential Phishing
Malware/Ransomware
Impersonation: Brand
Image as content
Free file host
Social engineering
Computer Vision
Optical Character Recognition
Exif analysis
HTML analysis
URL analysis
Link: RTL text reversal with recipient email in URL
7d ago
Aug 20th, 2026
Sublime Security
Credential Phishing
Evasion
Social engineering
HTML analysis
URL analysis
Credential Phishing
Evasion
Social engineering
HTML analysis
URL analysis
Link: Mismatched Shopify template button href
7d ago
Aug 20th, 2026
Sublime Security
Credential Phishing
Evasion
Social engineering
HTML analysis
URL analysis
Header analysis
Sender analysis
Credential Phishing
Evasion
Social engineering
HTML analysis
URL analysis
Header analysis
Sender analysis
Brand impersonation: Aramco
7d ago
Aug 20th, 2026
Sublime Security
BEC/Fraud
Impersonation: Brand
Lookalike domain
Social engineering
Content analysis
Header analysis
HTML analysis
Natural Language Understanding
Sender analysis
BEC/Fraud
Impersonation: Brand
Lookalike domain
Social engineering
Content analysis
Header analysis
HTML analysis
Natural Language Understanding
Sender analysis
Brand impersonation: Greetings Island
9d ago
Aug 18th, 2026
Sublime Security
Credential Phishing
Malware/Ransomware
Impersonation: Brand
Social engineering
Image as content
Spoofing
Content analysis
Computer Vision
Optical Character Recognition
Header analysis
HTML analysis
Sender analysis
Credential Phishing
Malware/Ransomware
Impersonation: Brand
Social engineering
Image as content
Spoofing
Content analysis
Computer Vision
Optical Character Recognition
Header analysis
HTML analysis
Sender analysis
Service abuse: Soundestlink.com Microsoft impersonation
10d ago
Aug 17th, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Lookalike domain
Social engineering
URL analysis
Content analysis
HTML analysis
Credential Phishing
Impersonation: Brand
Lookalike domain
Social engineering
URL analysis
Content analysis
HTML analysis
Attachment: RTF with link to free-hosted Cloudflare Pages
14d ago
Aug 13th, 2026
Sublime Security
Credential Phishing
Free subdomain host
File analysis
URL analysis
HTML analysis
Sender analysis
Credential Phishing
Free subdomain host
File analysis
URL analysis
HTML analysis
Sender analysis
Link: URL fragmented by hidden spans
14d ago
Aug 13th, 2026
Sublime Security
Credential Phishing
Evasion
Social engineering
HTML analysis
Content analysis
URL analysis
Credential Phishing
Evasion
Social engineering
HTML analysis
Content analysis
URL analysis
Service abuse: Soundestlink redirect with suspicious indicators
16d ago
Aug 11th, 2026
Sublime Security
Credential Phishing
Malware/Ransomware
Evasion
Header analysis
HTML analysis
Credential Phishing
Malware/Ransomware
Evasion
Header analysis
HTML analysis
Callback phishing: Zero-width character obfuscation from freemail sender
22d ago
Aug 5th, 2026
Sublime Security
Callback Phishing
Free email provider
Evasion
Social engineering
HTML analysis
Content analysis
Sender analysis
Callback Phishing
Free email provider
Evasion
Social engineering
HTML analysis
Content analysis
Sender analysis
Body: CSS Hidden text via clip-path
22d ago
Aug 5th, 2026
Sublime Security
Spam
Credential Phishing
Evasion
HTML analysis
Content analysis
Spam
Credential Phishing
Evasion
HTML analysis
Content analysis
Body: CSS zero-value calc() obfuscation
22d ago
Aug 5th, 2026
Sublime Security
Credential Phishing
Spam
Evasion
HTML analysis
Credential Phishing
Spam
Evasion
HTML analysis
Service abuse: Wufoo credential theft
22d ago
Aug 5th, 2026
Sublime Security
Credential Phishing
Social engineering
Content analysis
HTML analysis
Natural Language Understanding
Sender analysis
Credential Phishing
Social engineering
Content analysis
HTML analysis
Natural Language Understanding
Sender analysis
HTML: Template placeholders or recipient email in element class attributes
22d ago
Aug 5th, 2026
Sublime Security
Credential Phishing
BEC/Fraud
Evasion
Social engineering
HTML analysis
Content analysis
Credential Phishing
BEC/Fraud
Evasion
Social engineering
HTML analysis
Content analysis
Page 1 of 8

Rule Name & Severity	Last Updated	Author	Types, Tactics & Capabilities
Impersonation: SAM/SBA federal registration	18m ago Aug 27th, 2026	Sublime Security	Credential Phishing BEC/Fraud Impersonation: Brand Social engineering Image as content Sender analysis Content analysis HTML analysis Header analysis
Body: HTML whitespace stuffing with short initial message	2h ago Aug 27th, 2026	Sublime Security	Credential Phishing Evasion Social engineering Content analysis HTML analysis Header analysis
Body: CSS clamp() font obfuscation with suspicious URL	20h ago Aug 26th, 2026	Sublime Security	Credential Phishing Evasion Social engineering HTML analysis URL analysis Content analysis
Attachment: Risk assessment PDF with inline image	2d ago Aug 25th, 2026	Sublime Security	Malware/Ransomware Spam Image as content PDF Social engineering File analysis HTML analysis Header analysis Sender analysis
Link: Credential harvesting with excess padding evasion	2d ago Aug 25th, 2026	Sublime Security	Credential Phishing Evasion Social engineering Content analysis HTML analysis Exif analysis URL screenshot
Body: AI-generated invoice template artifacts	5d ago Aug 22nd, 2026	Sublime Security	Credential Phishing BEC/Fraud Social engineering Spoofing Natural Language Understanding HTML analysis Header analysis Sender analysis
Brand impersonation: Microsoft logo image linking to free file host	6d ago Aug 21st, 2026	Sublime Security	Credential Phishing Malware/Ransomware Impersonation: Brand Image as content Free file host Social engineering Computer Vision Optical Character Recognition Exif analysis HTML analysis URL analysis
Link: RTL text reversal with recipient email in URL	7d ago Aug 20th, 2026	Sublime Security	Credential Phishing Evasion Social engineering HTML analysis URL analysis
Link: Mismatched Shopify template button href	7d ago Aug 20th, 2026	Sublime Security	Credential Phishing Evasion Social engineering HTML analysis URL analysis Header analysis Sender analysis
Brand impersonation: Aramco	7d ago Aug 20th, 2026	Sublime Security	BEC/Fraud Impersonation: Brand Lookalike domain Social engineering Content analysis Header analysis HTML analysis Natural Language Understanding Sender analysis
Brand impersonation: Greetings Island	9d ago Aug 18th, 2026	Sublime Security	Credential Phishing Malware/Ransomware Impersonation: Brand Social engineering Image as content Spoofing Content analysis Computer Vision Optical Character Recognition Header analysis HTML analysis Sender analysis
Service abuse: Soundestlink.com Microsoft impersonation	10d ago Aug 17th, 2026	Sublime Security	Credential Phishing Impersonation: Brand Lookalike domain Social engineering URL analysis Content analysis HTML analysis
Attachment: RTF with link to free-hosted Cloudflare Pages	14d ago Aug 13th, 2026	Sublime Security	Credential Phishing Free subdomain host File analysis URL analysis HTML analysis Sender analysis
Link: URL fragmented by hidden spans	14d ago Aug 13th, 2026	Sublime Security	Credential Phishing Evasion Social engineering HTML analysis Content analysis URL analysis
Service abuse: Soundestlink redirect with suspicious indicators	16d ago Aug 11th, 2026	Sublime Security	Credential Phishing Malware/Ransomware Evasion Header analysis HTML analysis
Callback phishing: Zero-width character obfuscation from freemail sender	22d ago Aug 5th, 2026	Sublime Security	Callback Phishing Free email provider Evasion Social engineering HTML analysis Content analysis Sender analysis
Body: CSS Hidden text via clip-path	22d ago Aug 5th, 2026	Sublime Security	Spam Credential Phishing Evasion HTML analysis Content analysis
Body: CSS zero-value calc() obfuscation	22d ago Aug 5th, 2026	Sublime Security	Credential Phishing Spam Evasion HTML analysis
Service abuse: Wufoo credential theft	22d ago Aug 5th, 2026	Sublime Security	Credential Phishing Social engineering Content analysis HTML analysis Natural Language Understanding Sender analysis
HTML: Template placeholders or recipient email in element class attributes	22d ago Aug 5th, 2026	Sublime Security	Credential Phishing BEC/Fraud Evasion Social engineering HTML analysis Content analysis