Sublime Security

Sublime Core Feed
Content 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: Content analysis
Content analysis looks at the language and structure of a message to identify signs of phishing, social engineering, and other malicious intent. Instead of scanning for keywords, this method uses natural language understanding (NLU) to detect meaning, intent, and tone across the message.
Content analysis helps detect:
BEC attempts with urgent messages from executive impersonators
Credential phishing disguised as login or document notifications
Callback scams posing as account renewals or fake support
Extortion threats or blackmail messages
Financial or personal data requests in suspicious contexts
Fake job offers targeting employees
Invoice fraud, payroll fraud, and more
For example, a phishing email may impersonate a CFO asking for a wire transfer. Content analysis can flag the urgent tone, financial context, and impersonation attempt.
Blog Posts
Hiding a $50,000 BEC financial fraud in a fake email thread · Blog · Sublime Security
Callback phishing via invoice abuse and distribution list relays · Blog · Sublime Security
Hidden credential phishing within EML attachments · Blog · Sublime Security
Living Off the Land: Credential Phishing via Docusign abuse · Blog · Sublime Security
Living Off the Land: Callback Phishing via Docusign comment · Blog · Sublime Security
Adversarial ML: Extortion via LLM Manipulation Tactics · Blog · Sublime Security
Fake invoice used to conduct $16,800 BEC attempt · Blog · Sublime Security
QR Code Phishing: Decoding Hidden Threats · Blog · Sublime Security
Call Me Maybe? The Rise of Callback Phishing Emails · Blog · Sublime Security
Detecting QakBot: WSF attachments, OneNote files, and generic attack surface reduction · Blog · Sublime Security
Attack Types (7):
Credential Phishing
Callback Phishing
BEC/Fraud
Spam
Malware/Ransomware
Extortion
Reconnaissance
Tactics & Techniques (26):
Impersonation: Brand
Evasion
PDF
Image as content
Social engineering
Lookalike domain
Free email provider
ICS Phishing
QR code
Impersonation: Employee
Free subdomain host
Open redirect
Out of band pivot
Spoofing
HTML smuggling
Free file host
Scripting
Encryption
Exploit
Service abuse
Impersonation: VIP
Macros
Credential Phishing
LNK
OneNote
HTML injection
Rule Name & Severity
Last Updated
Types, Tactics & Capabilities
Attachment: Microsoft OAuth credential harvesting via EML with embedded malicious links
12h ago
Jun 1st, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Evasion
PDF
File analysis
URL analysis
Content analysis
Credential Phishing
Impersonation: Brand
Evasion
PDF
File analysis
URL analysis
Content analysis
Brand impersonation: USPS
14h ago
Jun 1st, 2026
Sublime Security
Credential Phishing
Image as content
Impersonation: Brand
Social engineering
Computer Vision
Content analysis
Natural Language Understanding
Sender analysis
Credential Phishing
Image as content
Impersonation: Brand
Social engineering
Computer Vision
Content analysis
Natural Language Understanding
Sender analysis
Brand impersonation: Sharepoint
14h ago
Jun 1st, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Social engineering
Computer Vision
Content analysis
File analysis
Natural Language Understanding
Sender analysis
Credential Phishing
Impersonation: Brand
Social engineering
Computer Vision
Content analysis
File analysis
Natural Language Understanding
Sender analysis
Brand impersonation: Quickbooks
15h ago
Jun 1st, 2026
Sublime Security
Callback Phishing
Credential Phishing
Impersonation: Brand
Social engineering
Computer Vision
Content analysis
Header analysis
Sender analysis
Callback Phishing
Credential Phishing
Impersonation: Brand
Social engineering
Computer Vision
Content analysis
Header analysis
Sender analysis
Brand Impersonation: PayPal
21h ago
Jun 1st, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Lookalike domain
Social engineering
Computer Vision
Content analysis
File analysis
Header analysis
Sender analysis
Credential Phishing
Impersonation: Brand
Lookalike domain
Social engineering
Computer Vision
Content analysis
File analysis
Header analysis
Sender analysis
Brand impersonation: Adobe with suspicious language and link
21h ago
Jun 1st, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Social engineering
Computer Vision
Content analysis
Header analysis
Sender analysis
Credential Phishing
Impersonation: Brand
Social engineering
Computer Vision
Content analysis
Header analysis
Sender analysis
Reconnaissance: Short generic greeting message
4d ago
May 29th, 2026
Sublime Security
BEC/Fraud
Callback Phishing
Social engineering
Free email provider
Content analysis
Header analysis
Natural Language Understanding
Sender analysis
BEC/Fraud
Callback Phishing
Social engineering
Free email provider
Content analysis
Header analysis
Natural Language Understanding
Sender analysis
Spam: Website errors solicitation
4d ago
May 29th, 2026
Sublime Security
Spam
Content analysis
Sender analysis
Natural Language Understanding
Spam
Content analysis
Sender analysis
Natural Language Understanding
Credential phishing: Engaging language and other indicators (untrusted sender)
4d ago
May 29th, 2026
Sublime Security
Credential Phishing
Free email provider
Social engineering
Content analysis
Header analysis
Natural Language Understanding
Sender analysis
URL analysis
Credential Phishing
Free email provider
Social engineering
Content analysis
Header analysis
Natural Language Understanding
Sender analysis
URL analysis
Body: HTML whitespace stuffing with short initial message
4d ago
May 29th, 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
Attachment: ICS calendar file with suspicious product identifier
4d ago
May 29th, 2026
Sublime Security
Credential Phishing
Evasion
Social engineering
ICS Phishing
File analysis
Content analysis
Credential Phishing
Evasion
Social engineering
ICS Phishing
File analysis
Content analysis
Impersonation Link: Cloud branding service with credential theft language
4d ago
May 29th, 2026
Sublime Security
Credential Phishing
Social engineering
Content analysis
Natural Language Understanding
Sender analysis
URL analysis
Credential Phishing
Social engineering
Content analysis
Natural Language Understanding
Sender analysis
URL analysis
Credential phishing: Suspicious e-sign agreement document notification
4d ago
May 29th, 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
Attachment: Compensation-themed DOCX with QR code credential theft
4d ago
May 29th, 2026
Sublime Security
Credential Phishing
QR code
Social engineering
Impersonation: Brand
File analysis
Optical Character Recognition
QR code analysis
Natural Language Understanding
Exif analysis
Content analysis
Credential Phishing
QR code
Social engineering
Impersonation: Brand
File analysis
Optical Character Recognition
QR code analysis
Natural Language Understanding
Exif analysis
Content analysis
Service Abuse: HelloSign share with suspicious sender or document name
5d ago
May 28th, 2026
Sublime Security
Callback Phishing
BEC/Fraud
Evasion
Social engineering
Sender analysis
Header analysis
Content analysis
Callback Phishing
BEC/Fraud
Evasion
Social engineering
Sender analysis
Header analysis
Content analysis
Impersonation: Employee using fabricated identity in initial contact
5d ago
May 28th, 2026
Sublime Security
BEC/Fraud
Impersonation: Employee
Social engineering
Content analysis
Sender analysis
BEC/Fraud
Impersonation: Employee
Social engineering
Content analysis
Sender analysis
Credential phishing: Fake storage alerts (unsolicited)
5d ago
May 28th, 2026
Sublime Security
Credential Phishing
Social engineering
Content analysis
Sender analysis
Credential Phishing
Social engineering
Content analysis
Sender analysis
Business Email Compromise: Request for mobile number via reply thread hijacking
5d ago
May 28th, 2026
Sublime Security
BEC/Fraud
Social engineering
Content analysis
Natural Language Understanding
Sender analysis
BEC/Fraud
Social engineering
Content analysis
Natural Language Understanding
Sender analysis
Credential phishing: AWS Lambda URL with recipient targeting
5d ago
May 28th, 2026
Sublime Security
Credential Phishing
Free subdomain host
Social engineering
URL analysis
Content analysis
Credential Phishing
Free subdomain host
Social engineering
URL analysis
Content analysis
Link: Self-sender credential theft with configuration placeholder
6d ago
May 27th, 2026
Sublime Security
Credential Phishing
Social engineering
Evasion
Natural Language Understanding
Content analysis
URL analysis
Header analysis
Credential Phishing
Social engineering
Evasion
Natural Language Understanding
Content analysis
URL analysis
Header analysis
Page 1 of 25

Rule Name & Severity	Last Updated	Author	Types, Tactics & Capabilities
Attachment: Microsoft OAuth credential harvesting via EML with embedded malicious links	12h ago Jun 1st, 2026	Sublime Security	Credential Phishing Impersonation: Brand Evasion PDF File analysis URL analysis Content analysis
Brand impersonation: USPS	14h ago Jun 1st, 2026	Sublime Security	Credential Phishing Image as content Impersonation: Brand Social engineering Computer Vision Content analysis Natural Language Understanding Sender analysis
Brand impersonation: Sharepoint	14h ago Jun 1st, 2026	Sublime Security	Credential Phishing Impersonation: Brand Social engineering Computer Vision Content analysis File analysis Natural Language Understanding Sender analysis
Brand impersonation: Quickbooks	15h ago Jun 1st, 2026	Sublime Security	Callback Phishing Credential Phishing Impersonation: Brand Social engineering Computer Vision Content analysis Header analysis Sender analysis
Brand Impersonation: PayPal	21h ago Jun 1st, 2026	Sublime Security	Credential Phishing Impersonation: Brand Lookalike domain Social engineering Computer Vision Content analysis File analysis Header analysis Sender analysis
Brand impersonation: Adobe with suspicious language and link	21h ago Jun 1st, 2026	Sublime Security	Credential Phishing Impersonation: Brand Social engineering Computer Vision Content analysis Header analysis Sender analysis
Reconnaissance: Short generic greeting message	4d ago May 29th, 2026	Sublime Security	BEC/Fraud Callback Phishing Social engineering Free email provider Content analysis Header analysis Natural Language Understanding Sender analysis
Spam: Website errors solicitation	4d ago May 29th, 2026	Sublime Security	Spam Content analysis Sender analysis Natural Language Understanding
Credential phishing: Engaging language and other indicators (untrusted sender)	4d ago May 29th, 2026	Sublime Security	Credential Phishing Free email provider Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis
Body: HTML whitespace stuffing with short initial message	4d ago May 29th, 2026	Sublime Security	Credential Phishing Evasion Social engineering Content analysis HTML analysis Header analysis
Attachment: ICS calendar file with suspicious product identifier	4d ago May 29th, 2026	Sublime Security	Credential Phishing Evasion Social engineering ICS Phishing File analysis Content analysis
Impersonation Link: Cloud branding service with credential theft language	4d ago May 29th, 2026	Sublime Security	Credential Phishing Social engineering Content analysis Natural Language Understanding Sender analysis URL analysis
Credential phishing: Suspicious e-sign agreement document notification	4d ago May 29th, 2026	Sublime Security	Credential Phishing Social engineering Content analysis Header analysis HTML analysis URL analysis Sender analysis
Attachment: Compensation-themed DOCX with QR code credential theft	4d ago May 29th, 2026	Sublime Security	Credential Phishing QR code Social engineering Impersonation: Brand File analysis Optical Character Recognition QR code analysis Natural Language Understanding Exif analysis Content analysis
Service Abuse: HelloSign share with suspicious sender or document name	5d ago May 28th, 2026	Sublime Security	Callback Phishing BEC/Fraud Evasion Social engineering Sender analysis Header analysis Content analysis
Impersonation: Employee using fabricated identity in initial contact	5d ago May 28th, 2026	Sublime Security	BEC/Fraud Impersonation: Employee Social engineering Content analysis Sender analysis
Credential phishing: Fake storage alerts (unsolicited)	5d ago May 28th, 2026	Sublime Security	Credential Phishing Social engineering Content analysis Sender analysis
Business Email Compromise: Request for mobile number via reply thread hijacking	5d ago May 28th, 2026	Sublime Security	BEC/Fraud Social engineering Content analysis Natural Language Understanding Sender analysis
Credential phishing: AWS Lambda URL with recipient targeting	5d ago May 28th, 2026	Sublime Security	Credential Phishing Free subdomain host Social engineering URL analysis Content analysis
Link: Self-sender credential theft with configuration placeholder	6d ago May 27th, 2026	Sublime Security	Credential Phishing Social engineering Evasion Natural Language Understanding Content analysis URL analysis Header analysis