Detection Method: Sender analysis

Sender analysis helps you assess whether an email is coming from a legitimate sender. By combining machine learning and rules-based logic, this method evaluates sender profiles, looking at things like authentication results, past behavior, and patterns from previous messages.
Sender analysis can help you detect:
  • Impersonation attempts using fake email addresses or domains
  • Suspicious senders with authentication issues (e.g., SPF, DKIM, DMARC failures)
  • Unusual behavior based on historical patterns, like frequent urgent requests
  • Senders linked to known phishing or malware campaigns
  • Changes in sender behavior that could indicate a compromised account
For example, an attacker might try to impersonate a trusted vendor or executive. The email address or domain might look real, but sender analysis can catch issues like failed authentication checks or past suspicious activity, helping you spot these threats before they do damage.
Blog Posts
Credential phishing Charles Schwab account holders with 2FA bypass · Blog · Sublime Security
Credential phishing Charles Schwab account holders with 2FA bypass · Blog · Sublime Security
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
Detecting malicious AnonymousFox email messages sent from compromised sites · Blog · Sublime Security
Detecting malicious AnonymousFox email messages sent from compromised sites · Blog · Sublime Security
Talking phish over turkey · Blog · Sublime Security
Talking phish over turkey · Blog · Sublime Security
Hidden credential phishing within EML attachments · 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: Credential Phishing via Docusign abuse · Blog · Sublime Security
Living Off the Land: Callback Phishing via Docusign comment · 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
Adversarial ML: Extortion via LLM Manipulation Tactics · Blog · Sublime Security
Attack Types (7):
Credential Phishing
BEC/Fraud
Malware/Ransomware
Callback Phishing
Spam
Reconnaissance
Extortion
Tactics & Techniques (24):
Social engineering
Evasion
Impersonation: Employee
Impersonation: Brand
Lookalike domain
PDF
Image as content
Free file host
Open redirect
Out of band pivot
Spoofing
Free email provider
Free subdomain host
Impersonation: VIP
Scripting
OneNote
QR code
Exploit
HTML smuggling
Encryption
LNK
Macros
IPFS
Punycode
Rule Name & Severity
Last Updated
Author
Types, Tactics & Capabilities
Credential phishing: Generic document sharing
3d ago
Feb 14th, 2026
Sublime Security
Credential Phishing
BEC/Fraud
Social engineering
Evasion
Impersonation: Employee
Content analysis
Natural Language Understanding
URL analysis
Sender analysis
/feeds/core/detection-rules/credential-phishing-generic-document-sharing-9f0e1d2c
Brand impersonation: Punchbowl
4d ago
Feb 13th, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Social engineering
Content analysis
Sender analysis
/feeds/core/detection-rules/brand-impersonation-punchbowl-58937ba0
Brand Impersonation: PayPal
4d ago
Feb 13th, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Lookalike domain
Social engineering
Computer Vision
Content analysis
File analysis
Header analysis
Sender analysis
/feeds/core/detection-rules/brand-impersonation-paypal-a6b2ceee
Russia return-path TLD (untrusted sender)
4d ago
Feb 13th, 2026
Sublime Security
BEC/Fraud
Credential Phishing
Malware/Ransomware
Header analysis
Sender analysis
/feeds/core/detection-rules/russia-return-path-tld-untrusted-sender-588b3954
Brand impersonation: Amazon
4d ago
Feb 13th, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Social engineering
Header analysis
Sender analysis
/feeds/core/detection-rules/brand-impersonation-amazon-13fc967d
Credential phishing: Tax form impersonation with payment request
4d ago
Feb 13th, 2026
Sublime Security
BEC/Fraud
Credential Phishing
Impersonation: Brand
Social engineering
PDF
Content analysis
Header analysis
Sender analysis
URL analysis
/feeds/core/detection-rules/credential-phishing-tax-form-impersonation-with-payment-request-717695cf
Brand impersonation: USPS
4d ago
Feb 13th, 2026
Sublime Security
Credential Phishing
Image as content
Impersonation: Brand
Social engineering
Computer Vision
Content analysis
Natural Language Understanding
Sender analysis
/feeds/core/detection-rules/brand-impersonation-usps-28b9130a
File sharing link from suspicious sender domain
4d ago
Feb 13th, 2026
Sublime Security
Credential Phishing
Malware/Ransomware
Free file host
Sender analysis
URL analysis
/feeds/core/detection-rules/file-sharing-link-from-suspicious-sender-domain-95f20354
Attachment: Self-sender PDF with minimal content and view prompt
5d ago
Feb 12th, 2026
Sublime Security
Credential Phishing
Malware/Ransomware
PDF
Social engineering
Evasion
Content analysis
File analysis
Sender analysis
/feeds/core/detection-rules/attachment-self-sender-pdf-with-minimal-content-and-view-prompt-07670a8c
Brand impersonation: Dropbox
5d ago
Feb 12th, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Social engineering
Content analysis
File analysis
Header analysis
Sender analysis
/feeds/core/detection-rules/brand-impersonation-dropbox-61f11d12
Open redirect: embluemail.com
5d ago
Feb 12th, 2026
Sublime Security
Credential Phishing
Malware/Ransomware
Open redirect
Sender analysis
URL analysis
/feeds/core/detection-rules/open-redirect-embluemailcom-48c5abd3
Brand impersonation: TikTok
5d ago
Feb 12th, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Social engineering
Computer Vision
Content analysis
Header analysis
Natural Language Understanding
Optical Character Recognition
Sender analysis
/feeds/core/detection-rules/brand-impersonation-tiktok-aaacc8b7
Link: PDF filename impersonation with credential theft language
5d ago
Feb 12th, 2026
Sublime Security
Credential Phishing
Social engineering
Evasion
PDF
Content analysis
Natural Language Understanding
Header analysis
Sender analysis
URL analysis
/feeds/core/detection-rules/link-pdf-filename-impersonation-with-credential-theft-language-05931513
Callback Phishing via Zoom comment
6d ago
Feb 11th, 2026
Sublime Security
Callback Phishing
Out of band pivot
Social engineering
Impersonation: Brand
Computer Vision
Content analysis
Header analysis
Sender analysis
/feeds/core/detection-rules/callback-phishing-via-zoom-comment-8ec30881
PayPal invoice abuse
6d ago
Feb 11th, 2026
Sublime Security
BEC/Fraud
Callback Phishing
Evasion
Social engineering
Content analysis
Header analysis
Sender analysis
/feeds/core/detection-rules/paypal-invoice-abuse-0ff7a0d4
Brand impersonation: Navan
8d ago
Feb 9th, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Social engineering
Spoofing
Sender analysis
Natural Language Understanding
URL analysis
Content analysis
/feeds/core/detection-rules/brand-impersonation-navan-3573e9a8
Reconnaissance: Empty subject with mismatched reply-to from new sender
11d ago
Feb 6th, 2026
Sublime Security
BEC/Fraud
Credential Phishing
Evasion
Social engineering
Spoofing
Header analysis
Sender analysis
/feeds/core/detection-rules/reconnaissance-empty-subject-with-mismatched-reply-to-from-new-sender-12f4bd45
Brand Impersonation: Disney
11d ago
Feb 6th, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Social engineering
Computer Vision
Natural Language Understanding
Content analysis
Header analysis
Sender analysis
/feeds/core/detection-rules/brand-impersonation-disney-bf90b8fb
New link domain (<=10d) from untrusted sender
11d ago
Feb 6th, 2026
Sublime Security
Credential Phishing
Malware/Ransomware
Sender analysis
URL analysis
Whois
/feeds/core/detection-rules/new-link-domain-less10d-from-untrusted-sender-4805b0e6
Service abuse: Apple TestFlight with suspicious developer reference
11d ago
Feb 6th, 2026
Sublime Security
Spam
Social engineering
Content analysis
HTML analysis
Natural Language Understanding
Sender analysis
URL analysis
/feeds/core/detection-rules/service-abuse-apple-testflight-with-suspicious-developer-reference-e7ea0ee0
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