Detection Method: Natural Language Understanding

Natural Language Understanding (NLU) uses machine learning algorithms to analyze and interpret message content, helping systems detect subtle signs of malicious intent. Instead of just matching keywords, NLU looks at the context, tone, urgency, and intent behind the message.
NLU can help you detect:
  • Urgent language commonly used in BEC attacks impersonating executives or departments
  • Credential theft attempts disguised as legitimate service notifications
  • Extortion or blackmail tactics used in intimidation campaigns
  • Financial terms typically found in payment fraud or invoice scams
  • Deceptive job offers designed to steal sensitive information
For example, NLU can identify when an email uses urgent language ("immediate attention required") combined with financial requests ("wire transfer") and impersonation, which are common tactics in BEC attacks.
Blog Posts
Hiding a $50,000 BEC financial fraud in a fake email thread · Blog · Sublime Security
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
Callback phishing via invoice abuse and distribution list relays · Blog · Sublime Security
B2B freight-forwarding scams on the rise to evade financial fraud crackdowns · Blog · Sublime Security
B2B freight-forwarding scams on the rise to evade financial fraud crackdowns · Blog · Sublime Security
Hidden credential phishing within EML attachments · Blog · Sublime Security
Hidden credential phishing within EML attachments · Blog · Sublime Security
Adversarial ML: Extortion via LLM Manipulation Tactics · Blog · Sublime Security
Adversarial ML: Extortion via LLM Manipulation Tactics · Blog · Sublime Security
Combating GenAI Email Attacks with BERT LLM · Blog · Sublime Security
Combating GenAI Email Attacks with BERT LLM · Blog · Sublime Security
Payroll Fraud via LLM-Generated Emails · Blog · Sublime Security
Payroll Fraud via LLM-Generated Emails · Blog · Sublime Security
Fake invoice used to conduct $16,800 BEC attempt · Blog · Sublime Security
Fake invoice used to conduct $16,800 BEC attempt · Blog · Sublime Security
QR Code Phishing: Decoding Hidden Threats · Blog · Sublime Security
QR Code Phishing: Decoding Hidden Threats · Blog · Sublime Security
Call Me Maybe? The Rise of Callback Phishing Emails · Blog · Sublime Security
Call Me Maybe? The Rise of Callback Phishing Emails · Blog · Sublime Security
Attack Types (7):
Credential Phishing
BEC/Fraud
Extortion
Spam
Callback Phishing
ICS Phishing
Malware/Ransomware
Tactics & Techniques (21):
Evasion
PDF
Social engineering
Impersonation: Employee
Impersonation: VIP
Impersonation: Brand
Image as content
Spoofing
Free file host
Free subdomain host
Free email provider
Open redirect
Encryption
Scripting
Out of band pivot
Lookalike domain
ICS Phishing
QR code
HTML smuggling
Macros
IPFS
Rule Name & Severity
Last Updated
Author
Types, Tactics & Capabilities
Suspicious attachment with unscannable Cloudflare link
4h ago
Sep 16th, 2026
Sublime Security
Credential Phishing
Evasion
PDF
Social engineering
Impersonation: Employee
Impersonation: VIP
File analysis
URL analysis
Sender analysis
Content analysis
Header analysis
Natural Language Understanding
Link: Possible Intuit link abuse
22h ago
Sep 15th, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Social engineering
URL analysis
Natural Language Understanding
Content analysis
Header analysis
Brand impersonation: Kroger
1d ago
Sep 15th, 2026
Sublime Security
Credential Phishing
BEC/Fraud
Impersonation: Brand
Social engineering
Image as content
Sender analysis
Content analysis
Optical Character Recognition
Natural Language Understanding
Header analysis
Attachment: Legal themed message or PDF with suspicious indicators
1d ago
Sep 15th, 2026
Sublime Security
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
BEC/Fraud: Fake investment outreach from suspicious TLD
2d ago
Sep 14th, 2026
Sublime Security
BEC/Fraud
Social engineering
Header analysis
Sender analysis
Content analysis
Natural Language Understanding
Credential phishing: Generic document sharing
2d ago
Sep 14th, 2026
Sublime Security
Credential Phishing
BEC/Fraud
Social engineering
Evasion
Impersonation: Employee
Content analysis
Natural Language Understanding
URL analysis
Sender analysis
Brand impersonation: Survey request with credential theft indicators
5d ago
Sep 11th, 2026
Sublime Security
Credential Phishing
Social engineering
Impersonation: Brand
Spoofing
Content analysis
Header analysis
Natural Language Understanding
Sender analysis
Attachment: Excel file with hyperlinks to suspicious domains
5d ago
Sep 11th, 2026
Sublime Security
BEC/Fraud
Credential Phishing
Free file host
Free subdomain host
Social engineering
Natural Language Understanding
Content analysis
Exif analysis
File analysis
URL analysis
Brand impersonation: USPS
6d ago
Sep 10th, 2026
Sublime Security
Credential Phishing
Image as content
Impersonation: Brand
Social engineering
Computer Vision
Content analysis
Natural Language Understanding
Sender analysis
Business Email Compromise: Request for mobile number via reply thread hijacking
6d ago
Sep 10th, 2026
Sublime Security
BEC/Fraud
Social engineering
Content analysis
Natural Language Understanding
Sender analysis
Attachment: ICS calendar invite with photo/file share lure
7d ago
Sep 9th, 2026
Sublime Security
Credential Phishing
Free email provider
Social engineering
Open redirect
Image as content
File analysis
Natural Language Understanding
Content analysis
URL analysis
Sender analysis
Header analysis
Brand impersonation: Morgan Stanley
8d ago
Sep 8th, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Social engineering
Content analysis
Natural Language Understanding
Sender analysis
BEC: Wealth management lure from newly registered domain
8d ago
Sep 8th, 2026
Sublime Security
BEC/Fraud
Social engineering
Whois
Content analysis
Natural Language Understanding
Attachment: Word document with hyperlink and fraud language
12d ago
Sep 4th, 2026
Sublime Security
Credential Phishing
BEC/Fraud
Free email provider
Social engineering
Evasion
File analysis
XML analysis
HTML analysis
URL analysis
Natural Language Understanding
Sender analysis
Brand impersonation: MyChart
12d ago
Sep 4th, 2026
Sublime Security
Credential Phishing
Spam
Impersonation: Brand
Social engineering
Spoofing
Content analysis
Natural Language Understanding
Header analysis
Sender analysis
Attachment: Encrypted PDF with credential theft language in EML
12d ago
Sep 4th, 2026
Sublime Security
Credential Phishing
Encryption
Evasion
PDF
Social engineering
Content analysis
Exif analysis
File analysis
Natural Language Understanding
Sender analysis
Attachment: Encrypted PDF with credential theft body
12d ago
Sep 4th, 2026
Sublime Security
Credential Phishing
Encryption
Evasion
PDF
Social engineering
Content analysis
Exif analysis
File analysis
Natural Language Understanding
Sender analysis
Callback Scam: Outlook groups
12d ago
Sep 4th, 2026
Sublime Security
Callback Phishing
Social engineering
Natural Language Understanding
Header analysis
Attachment: ICS file with credential theft indicators
12d ago
Sep 4th, 2026
Sublime Security
ICS Phishing
Credential Phishing
Free file host
Free subdomain host
Social engineering
File analysis
Natural Language Understanding
URL analysis
Whois
Credential phishing: Engaging language and other indicators (untrusted sender)
12d ago
Sep 4th, 2026
Sublime Security
Credential Phishing
Free email provider
Social engineering
Content analysis
Header analysis
Natural Language Understanding
Sender analysis
URL analysis
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