Tactic or Technique: Free email provider

Attackers often use free email services like Gmail, Hotmail, and Yahoo to send phishing messages that are harder to detect. These platforms are widely trusted and have high deliverability, which makes it easier for malicious emails to land in your inbox.
It only takes a few minutes for an attacker to create a throwaway account. From there, they can spoof a display name to look like a coworker, vendor, or partner. Since free email addresses are often used in real conversations, the message may not seem out of place.
This tactic works because it blends in. A message might look clean, use a familiar name, and avoid anything that would trigger a filter. If you’re not paying close attention, it’s easy to miss the signs and respond without realizing the sender isn’t who they claim to be.
Rule Name & Severity
Last Updated
Author
Types, Tactics & Capabilities
Canva infrastructure abuse
6d ago
Feb 6th, 2026
Sublime Security
/feeds/core/detection-rules/canva-infrastructure-abuse-b69fdb5c
Brand impersonation: Zoom via lookalike domain
7d ago
Feb 5th, 2026
Sublime Security
/feeds/core/detection-rules/brand-impersonation-zoom-via-lookalike-domain-b9d5e4b5
ClickFunnels link infrastructure abuse
7d ago
Feb 5th, 2026
Sublime Security
/feeds/core/detection-rules/clickfunnels-link-infrastructure-abuse-9192fbe9
Impersonation: Executive using numbered local part
13d ago
Jan 30th, 2026
Sublime Security
/feeds/core/detection-rules/impersonation-executive-using-numbered-local-part-8e005a22
Reconnaissance: Hotel booking reply-to redirect
16d ago
Jan 27th, 2026
Sublime Security
/feeds/core/detection-rules/reconnaissance-hotel-booking-reply-to-redirect-08c36035
Reconnaissance: Short generic greeting message
16d ago
Jan 27th, 2026
Sublime Security
/feeds/core/detection-rules/reconnaissance-short-generic-greeting-message-c67dedab
BEC/Fraud: Romance scam
21d ago
Jan 22nd, 2026
Sublime Security
/feeds/core/detection-rules/becfraud-romance-scam-0243cdaa
Request for Quote or Purchase (RFQ|RFP) with suspicious sender or recipient pattern
28d ago
Jan 15th, 2026
Sublime Security
/feeds/core/detection-rules/request-for-quote-or-purchase-rfqorrfp-with-suspicious-sender-or-recipient-pattern-2ac0d329
Attachment: Callback phishing solicitation via image file
1mo ago
Jan 12th, 2026
@vector_sec
/feeds/core/detection-rules/attachment-callback-phishing-solicitation-via-image-file-60acbb36
Reconnaissance: Email address harvesting attempt
1mo ago
Jan 12th, 2026
Sublime Security
/feeds/core/detection-rules/reconnaissance-email-address-harvesting-attempt-bb31efbc
Credential phishing: Engaging language and other indicators (untrusted sender)
1mo ago
Jan 12th, 2026
Sublime Security
/feeds/core/detection-rules/credential-phishing-engaging-language-and-other-indicators-untrusted-sender-c2bc8ca2
Link: Invoice or receipt from freemail sender with customer service number
1mo ago
Jan 12th, 2026
@vector_sec
/feeds/core/detection-rules/link-invoice-or-receipt-from-freemail-sender-with-customer-service-number-3825232d
Spam: Default Microsoft Exchange Online sender domain (onmicrosoft.com)
1mo ago
Jan 12th, 2026
Sublime Security
/feeds/core/detection-rules/spam-default-microsoft-exchange-online-sender-domain-onmicrosoftcom-3f2a64ce
Spam: URL shortener with short body content and emojis
1mo ago
Jan 12th, 2026
Sublime Security
/feeds/core/detection-rules/spam-url-shortener-with-short-body-content-and-emojis-b7797e4c
Callback phishing via Intuit service abuse
1mo ago
Jan 12th, 2026
Sublime Security
/feeds/core/detection-rules/callback-phishing-via-intuit-service-abuse-f2fe1294
BEC/Fraud: Job scam fake thread or plaintext pivot to freemail
1mo ago
Jan 12th, 2026
Sublime Security
/feeds/core/detection-rules/becfraud-job-scam-fake-thread-or-plaintext-pivot-to-freemail-ce21c151
Google services using g.co shortlinks
1mo ago
Jan 12th, 2026
Sublime Security
/feeds/core/detection-rules/google-services-using-gco-shortlinks-09ff8a73
Attachment: PDF file with link to fake Bitcoin exchange
1mo ago
Jan 12th, 2026
Sublime Security
/feeds/core/detection-rules/attachment-pdf-file-with-link-to-fake-bitcoin-exchange-47601cb7
BEC/Fraud: Urgent language and suspicious sending/infrastructure patterns
1mo ago
Jan 12th, 2026
Sublime Security
/feeds/core/detection-rules/becfraud-urgent-language-and-suspicious-sendinginfrastructure-patterns-ba8a79e0
COVID-19 themed fraud with sender and reply-to mismatch or compensation award
1mo ago
Jan 12th, 2026
Sublime Security
/feeds/core/detection-rules/covid-19-themed-fraud-with-sender-and-reply-to-mismatch-or-compensation-award-a16480ef