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):
BEC/Fraud
Credential Phishing
Malware/Ransomware
Callback Phishing
Spam
Extortion
Reconnaissance
Tactics & Techniques (27):
Impersonation: Email address
Social engineering
Free email provider
Impersonation: Brand
Lookalike domain
Evasion
Impersonation: Employee
Image as content
Impersonation: Domain
QR code
Free file host
Out of band pivot
Spoofing
PDF
Scripting
ICS Phishing
Free subdomain host
Macros
Open redirect
HTML smuggling
Exploit
Impersonation: VIP
Encryption
OneNote
IPFS
LNK
Punycode
Rule Name & Severity
Last Updated
Author
Types, Tactics & Capabilities
Observed IOC: Malicious sender email addresses
1d ago
May 29th, 2026
Sublime Security
BEC/Fraud
Credential Phishing
Malware/Ransomware
Social engineering
Sender analysis
Header analysis
Reconnaissance: Short generic greeting message
1d ago
May 29th, 2026
Sublime Security
BEC/Fraud
Callback Phishing
Social engineering
Free email provider
Content analysis
Header analysis
Natural Language Understanding
Sender analysis
Credential phishing: Engaging language and other indicators (untrusted sender)
1d ago
May 29th, 2026
Sublime Security
Credential Phishing
Free email provider
Social engineering
Content analysis
Header analysis
Natural Language Understanding
Sender analysis
URL analysis
Spam: Website errors solicitation
1d ago
May 29th, 2026
Sublime Security
Spam
Content analysis
Sender analysis
Natural Language Understanding
Brand impersonation: Meta and subsidiaries
1d ago
May 29th, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Lookalike domain
Social engineering
Header analysis
Sender analysis
Impersonation Link: Cloud branding service with credential theft language
1d 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
1d ago
May 29th, 2026
Sublime Security
Credential Phishing
Social engineering
Content analysis
Header analysis
HTML analysis
URL analysis
Sender analysis
Service Abuse: HelloSign share with suspicious sender or document name
2d 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
2d ago
May 28th, 2026
Sublime Security
BEC/Fraud
Impersonation: Employee
Social engineering
Content analysis
Sender analysis
Business Email Compromise: Request for mobile number via reply thread hijacking
2d ago
May 28th, 2026
Sublime Security
BEC/Fraud
Social engineering
Content analysis
Natural Language Understanding
Sender analysis
Credential phishing: Fake storage alerts (unsolicited)
2d ago
May 28th, 2026
Sublime Security
Credential Phishing
Social engineering
Content analysis
Sender analysis
Brand impersonation: Figma with malicious document access overlay
3d ago
May 27th, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Social engineering
Image as content
Sender analysis
HTML analysis
URL screenshot
Optical Character Recognition
URL analysis
Observed IOC: Malicious sender domains
3d ago
May 27th, 2026
Sublime Security
BEC/Fraud
Credential Phishing
Malware/Ransomware
Social engineering
Sender analysis
Header analysis
Service abuse: Square marketing with suspicious QR code
4d ago
May 26th, 2026
Sublime Security
Credential Phishing
QR code
Free file host
Computer Vision
QR code analysis
Sender analysis
URL analysis
Brand impersonation: DHL
4d ago
May 26th, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Lookalike domain
Social engineering
Header analysis
Sender analysis
Brand Impersonation: Procore
4d ago
May 26th, 2026
Sublime Security
BEC/Fraud
Credential Phishing
Impersonation: Brand
Social engineering
Content analysis
Sender analysis
Brand impersonation: Dashlane
4d ago
May 26th, 2026
Sublime Security
Credential Phishing
Impersonation: Brand
Social engineering
Header analysis
Sender analysis
Business Email Compromise (BEC) with request for mobile number
4d ago
May 26th, 2026
Sublime Security
BEC/Fraud
Social engineering
Content analysis
Natural Language Understanding
Sender analysis
Service abuse: Amazon invitation with suspected callback phishing
8d ago
May 22nd, 2026
Sublime Security
Callback Phishing
Out of band pivot
Social engineering
Content analysis
HTML analysis
Sender analysis
Credential phishing: Generic document sharing
8d ago
May 22nd, 2026
Sublime Security
Credential Phishing
BEC/Fraud
Social engineering
Evasion
Impersonation: Employee
Content analysis
Natural Language Understanding
URL analysis
Sender analysis
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