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):
Spam
Credential Phishing
BEC/Fraud
Callback Phishing
Malware/Ransomware
Extortion
Reconnaissance
Tactics & Techniques (26):
Social engineering
Impersonation: Brand
Evasion
Impersonation: Employee
Out of band pivot
PDF
Lookalike domain
Free file host
Free email provider
Image as content
QR code
Scripting
Spoofing
Free subdomain host
Open redirect
ICS Phishing
Encryption
Exploit
HTML smuggling
Service abuse
Impersonation: VIP
Macros
Credential Phishing
LNK
OneNote
HTML injection
Rule Name & Severity
Last Updated
Types, Tactics & Capabilities
Service abuse: Demio notifications with suspicious content patterns
22h ago
May 11th, 2026
Sublime Security
Spam
Social engineering
Impersonation: Brand
Sender analysis
Content analysis
Spam
Social engineering
Impersonation: Brand
Sender analysis
Content analysis
Benefits enrollment impersonation
22h ago
May 11th, 2026
Sublime Security
Credential Phishing
Evasion
Impersonation: Employee
Out of band pivot
Social engineering
Content analysis
Header analysis
Sender analysis
Credential Phishing
Evasion
Impersonation: Employee
Out of band pivot
Social engineering
Content analysis
Header analysis
Sender analysis
Investor solicitation with organization targeting
4d ago
May 8th, 2026
Sublime Security
BEC/Fraud
Social engineering
Content analysis
BEC/Fraud
Social engineering
Content analysis
Brand impersonation: Quickbooks
4d ago
May 8th, 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
Service abuse: Microsoft with suspicious indicators in subject
5d ago
May 7th, 2026
Sublime Security
Credential Phishing
Spam
Impersonation: Brand
Social engineering
Sender analysis
Content analysis
Credential Phishing
Spam
Impersonation: Brand
Social engineering
Sender analysis
Content analysis
Attachment: Suspicious PDF created with headless browser
5d ago
May 7th, 2026
Sublime Security
Credential Phishing
Evasion
PDF
Content analysis
Exif analysis
File analysis
Optical Character Recognition
Credential Phishing
Evasion
PDF
Content analysis
Exif analysis
File analysis
Optical Character Recognition
Observed IOC: Malicious domains in body links
5d ago
May 7th, 2026
Sublime Security
Credential Phishing
Malware/Ransomware
Evasion
Social engineering
URL analysis
Content analysis
Credential Phishing
Malware/Ransomware
Evasion
Social engineering
URL analysis
Content analysis
Brand Impersonation: PayPal
5d ago
May 7th, 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
Spam: Website errors solicitation
5d ago
May 7th, 2026
Sublime Security
Spam
Content analysis
Sender analysis
Natural Language Understanding
Spam
Content analysis
Sender analysis
Natural Language Understanding
Business Email Compromise (BEC) with request for mobile number
5d ago
May 7th, 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
Service abuse: Dropbox Paper with copy-paste instructions
5d ago
May 7th, 2026
Sublime Security
Credential Phishing
Social engineering
Free file host
Evasion
Content analysis
URL analysis
Credential Phishing
Social engineering
Free file host
Evasion
Content analysis
URL analysis
Link: Cloud service with credential theft language
6d ago
May 6th, 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
Suspicious newly registered reply-to domain with engaging financial or urgent language
6d ago
May 6th, 2026
Sublime Security
BEC/Fraud
Social engineering
Content analysis
Header analysis
Natural Language Understanding
Sender analysis
URL analysis
Whois
BEC/Fraud
Social engineering
Content analysis
Header analysis
Natural Language Understanding
Sender analysis
URL analysis
Whois
Service Abuse: Zoom with freemail reply-to and recipient address in greeting
6d ago
May 6th, 2026
Sublime Security
Spam
Free email provider
Social engineering
Sender analysis
Header analysis
Content analysis
Spam
Free email provider
Social engineering
Sender analysis
Header analysis
Content analysis
Link: Romance/Sexual Language With Suspicious Link
7d ago
May 5th, 2026
Sublime Security
Spam
Social engineering
Content analysis
Header analysis
URL analysis
Whois
Spam
Social engineering
Content analysis
Header analysis
URL analysis
Whois
Brand impersonation: DocuSign with embedded QR code
8d ago
May 4th, 2026
Sublime Security
Credential Phishing
Evasion
Image as content
Impersonation: Brand
QR code
Computer Vision
Content analysis
QR code analysis
Sender analysis
Credential Phishing
Evasion
Image as content
Impersonation: Brand
QR code
Computer Vision
Content analysis
QR code analysis
Sender analysis
BEC/Fraud: Student loan callback phishing
8d ago
May 4th, 2026
Sublime Security
BEC/Fraud
Free email provider
Out of band pivot
Social engineering
Content analysis
Natural Language Understanding
Sender analysis
BEC/Fraud
Free email provider
Out of band pivot
Social engineering
Content analysis
Natural Language Understanding
Sender analysis
Callback phishing via Zelle Service Abuse
8d ago
May 4th, 2026
Sublime Security
BEC/Fraud
Callback Phishing
Evasion
Social engineering
Content analysis
Header analysis
Sender analysis
BEC/Fraud
Callback Phishing
Evasion
Social engineering
Content analysis
Header analysis
Sender analysis
Callback phishing via Intuit service abuse
8d ago
May 4th, 2026
Sublime Security
Callback Phishing
Evasion
Free email provider
Impersonation: Brand
Social engineering
Computer Vision
Content analysis
Header analysis
Optical Character Recognition
Callback Phishing
Evasion
Free email provider
Impersonation: Brand
Social engineering
Computer Vision
Content analysis
Header analysis
Optical Character Recognition
Impersonation: Suspected supplier impersonation with suspicious content
8d ago
May 4th, 2026
Sublime Security
BEC/Fraud
Evasion
Free email provider
Lookalike domain
Social engineering
Content analysis
Header analysis
Natural Language Understanding
Sender analysis
URL analysis
Whois
BEC/Fraud
Evasion
Free email provider
Lookalike domain
Social engineering
Content analysis
Header analysis
Natural Language Understanding
Sender analysis
URL analysis
Whois
Page 1 of 25

Rule Name & Severity	Last Updated	Author	Types, Tactics & Capabilities
Service abuse: Demio notifications with suspicious content patterns	22h ago May 11th, 2026	Sublime Security	Spam Social engineering Impersonation: Brand Sender analysis Content analysis
Benefits enrollment impersonation	22h ago May 11th, 2026	Sublime Security	Credential Phishing Evasion Impersonation: Employee Out of band pivot Social engineering Content analysis Header analysis Sender analysis
Investor solicitation with organization targeting	4d ago May 8th, 2026	Sublime Security	BEC/Fraud Social engineering Content analysis
Brand impersonation: Quickbooks	4d ago May 8th, 2026	Sublime Security	Callback Phishing Credential Phishing Impersonation: Brand Social engineering Computer Vision Content analysis Header analysis Sender analysis
Service abuse: Microsoft with suspicious indicators in subject	5d ago May 7th, 2026	Sublime Security	Credential Phishing Spam Impersonation: Brand Social engineering Sender analysis Content analysis
Attachment: Suspicious PDF created with headless browser	5d ago May 7th, 2026	Sublime Security	Credential Phishing Evasion PDF Content analysis Exif analysis File analysis Optical Character Recognition
Observed IOC: Malicious domains in body links	5d ago May 7th, 2026	Sublime Security	Credential Phishing Malware/Ransomware Evasion Social engineering URL analysis Content analysis
Brand Impersonation: PayPal	5d ago May 7th, 2026	Sublime Security	Credential Phishing Impersonation: Brand Lookalike domain Social engineering Computer Vision Content analysis File analysis Header analysis Sender analysis
Spam: Website errors solicitation	5d ago May 7th, 2026	Sublime Security	Spam Content analysis Sender analysis Natural Language Understanding
Business Email Compromise (BEC) with request for mobile number	5d ago May 7th, 2026	Sublime Security	BEC/Fraud Social engineering Content analysis Natural Language Understanding Sender analysis
Service abuse: Dropbox Paper with copy-paste instructions	5d ago May 7th, 2026	Sublime Security	Credential Phishing Social engineering Free file host Evasion Content analysis URL analysis
Link: Cloud service with credential theft language	6d ago May 6th, 2026	Sublime Security	Credential Phishing Social engineering Content analysis Natural Language Understanding Sender analysis URL analysis
Suspicious newly registered reply-to domain with engaging financial or urgent language	6d ago May 6th, 2026	Sublime Security	BEC/Fraud Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis Whois
Service Abuse: Zoom with freemail reply-to and recipient address in greeting	6d ago May 6th, 2026	Sublime Security	Spam Free email provider Social engineering Sender analysis Header analysis Content analysis
Link: Romance/Sexual Language With Suspicious Link	7d ago May 5th, 2026	Sublime Security	Spam Social engineering Content analysis Header analysis URL analysis Whois
Brand impersonation: DocuSign with embedded QR code	8d ago May 4th, 2026	Sublime Security	Credential Phishing Evasion Image as content Impersonation: Brand QR code Computer Vision Content analysis QR code analysis Sender analysis
BEC/Fraud: Student loan callback phishing	8d ago May 4th, 2026	Sublime Security	BEC/Fraud Free email provider Out of band pivot Social engineering Content analysis Natural Language Understanding Sender analysis
Callback phishing via Zelle Service Abuse	8d ago May 4th, 2026	Sublime Security	BEC/Fraud Callback Phishing Evasion Social engineering Content analysis Header analysis Sender analysis
Callback phishing via Intuit service abuse	8d ago May 4th, 2026	Sublime Security	Callback Phishing Evasion Free email provider Impersonation: Brand Social engineering Computer Vision Content analysis Header analysis Optical Character Recognition
Impersonation: Suspected supplier impersonation with suspicious content	8d ago May 4th, 2026	Sublime Security	BEC/Fraud Evasion Free email provider Lookalike domain Social engineering Content analysis Header analysis Natural Language Understanding Sender analysis URL analysis Whois