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
Spam
Callback Phishing
Reconnaissance
Extortion
Tactics & Techniques (24):
Evasion
Free file host
Social engineering
Impersonation: Brand
Free email provider
Lookalike domain
OneNote
PDF
Encryption
Impersonation: VIP
Spoofing
Open redirect
Free subdomain host
Image as content
Impersonation: Employee
Out of band pivot
Scripting
Exploit
HTML smuggling
QR code
Macros
IPFS
LNK
Punycode
Rule Name & Severity
Last Updated
Author
Types, Tactics & Capabilities
Link: Figma design deck with credential theft language
12h ago
Mar 4th, 2026
Sublime Security
Credential Phishing
Evasion
Free file host
Social engineering
Natural Language Understanding
Computer Vision
Optical Character Recognition
URL analysis
URL screenshot
Sender analysis
/feeds/core/detection-rules/link-figma-design-deck-with-credential-theft-language-87601924
Service abuse: HungerRush domain with SendGrid tracking targeting ProtonMail
14h ago
Mar 4th, 2026
Sublime Security
BEC/Fraud
Evasion
Sender analysis
HTML analysis
Content analysis
/feeds/core/detection-rules/service-abuse-hungerrush-domain-with-sendgrid-tracking-targeting-protonmail-73f62e74
Brand Impersonation: Disney
16h ago
Mar 4th, 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
Service abuse: DocSend share from an unsolicited reply-to address
17h ago
Mar 4th, 2026
Sublime Security
Credential Phishing
Evasion
Free file host
Social engineering
Content analysis
Header analysis
Sender analysis
/feeds/core/detection-rules/service-abuse-docsend-share-from-an-unsolicited-reply-to-address-b377e64c
BEC with unusual reply-to or return-path mismatch
2d ago
Mar 3rd, 2026
Sublime Security
BEC/Fraud
Evasion
Free email provider
Social engineering
Content analysis
Header analysis
Natural Language Understanding
Sender analysis
/feeds/core/detection-rules/bec-with-unusual-reply-to-or-return-path-mismatch-83e5e2df
Link: Direct download of executable file
3d ago
Mar 2nd, 2026
Sublime Security
Malware/Ransomware
Evasion
Sender analysis
URL analysis
/feeds/core/detection-rules/link-direct-download-of-executable-file-dbbfd077
Link: Google Forms link with credential theft language
3d ago
Mar 2nd, 2026
Sublime Security
Credential Phishing
Social engineering
Natural Language Understanding
Sender analysis
URL analysis
/feeds/core/detection-rules/link-google-forms-link-with-credential-theft-language-0cad40e2
Brand impersonation: Chase Bank
3d ago
Mar 2nd, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Lookalike domain
Social engineering
Header analysis
Sender analysis
/feeds/core/detection-rules/brand-impersonation-chase-bank-c680f1e7
Link: SharePoint OneNote or PDF link with self sender behavior
6d ago
Feb 27th, 2026
Sublime Security
Credential Phishing
Evasion
Free file host
OneNote
PDF
Header analysis
URL analysis
Sender analysis
/feeds/core/detection-rules/link-sharepoint-onenote-or-pdf-link-with-self-sender-behavior-588e7203
Attachment: Encrypted PDF with credential theft body
7d ago
Feb 26th, 2026
Sublime Security
Credential Phishing
Encryption
Evasion
PDF
Social engineering
Content analysis
Exif analysis
File analysis
Natural Language Understanding
Sender analysis
/feeds/core/detection-rules/attachment-encrypted-pdf-with-credential-theft-body-c9596c9a
VIP / Executive impersonation (strict match, untrusted)
8d ago
Feb 25th, 2026
Sublime Security
BEC/Fraud
Impersonation: VIP
Header analysis
Sender analysis
/feeds/core/detection-rules/vip-executive-impersonation-strict-match-untrusted-e42c84b7
Brand impersonation: DocuSign
9d ago
Feb 24th, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Lookalike domain
Social engineering
Spoofing
Header analysis
Sender analysis
URL analysis
/feeds/core/detection-rules/brand-impersonation-docusign-4d29235c
Spam: Sendersrv.com with financial communications and unsubscribe language
9d ago
Feb 24th, 2026
Sublime Security
Spam
Evasion
Social engineering
Header analysis
Content analysis
Natural Language Understanding
Sender analysis
/feeds/core/detection-rules/spam-sendersrvcom-with-financial-communications-and-unsubscribe-language-69570820
Link: URL redirecting to blob URL
9d ago
Feb 24th, 2026
Sublime Security
Credential Phishing
Malware/Ransomware
Evasion
Free file host
Open redirect
Sender analysis
URL analysis
Threat intelligence
/feeds/core/detection-rules/link-url-redirecting-to-blob-url-1677135b
Link: Free file hosting with undisclosed recipients
10d ago
Feb 23rd, 2026
Sublime Security
Credential Phishing
Malware/Ransomware
Free file host
Free subdomain host
Evasion
Header analysis
URL analysis
Sender analysis
Natural Language Understanding
/feeds/core/detection-rules/link-free-file-hosting-with-undisclosed-recipients-b6281306
Brand impersonation: Meta and subsidiaries
10d ago
Feb 23rd, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Lookalike domain
Social engineering
Header analysis
Sender analysis
/feeds/core/detection-rules/brand-impersonation-meta-and-subsidiaries-e38f1e3b
Reconnaissance: Email address harvesting attempt
10d ago
Feb 23rd, 2026
Sublime Security
BEC/Fraud
Credential Phishing
Spam
Free email provider
Social engineering
Content analysis
Header analysis
Sender analysis
URL analysis
/feeds/core/detection-rules/reconnaissance-email-address-harvesting-attempt-bb31efbc
Brand impersonation: Survey request with credential theft indicators
13d ago
Feb 20th, 2026
Sublime Security
Credential Phishing
Social engineering
Impersonation: Brand
Spoofing
Content analysis
Header analysis
Natural Language Understanding
Sender analysis
/feeds/core/detection-rules/brand-impersonation-survey-request-with-credential-theft-indicators-ea1c0e09
Cloud storage impersonation with credential theft indicators
13d ago
Feb 20th, 2026
Sublime Security
Credential Phishing
Free file host
Image as content
Impersonation: Brand
Social engineering
Computer Vision
Content analysis
Header analysis
Natural Language Understanding
Optical Character Recognition
Sender analysis
URL analysis
/feeds/core/detection-rules/cloud-storage-impersonation-with-credential-theft-indicators-4c20f72c
Link: Direct MSI download from low reputation domain
14d ago
Feb 19th, 2026
Sublime Security
Malware/Ransomware
Evasion
Sender analysis
URL analysis
/feeds/core/detection-rules/link-direct-msi-download-from-low-reputation-domain-1eb77537
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