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
BEC/Fraud: Urgent language and suspicious sending/infrastructure patterns
3d ago
Apr 17th, 2026
Sublime Security
Brand impersonation: Zoom via lookalike domain
13d ago
Apr 7th, 2026
Sublime Security
Link: Apple TestFlight from suspicious sender
19d ago
Apr 1st, 2026
Sublime Security
Spam: Fake dating profile notification
1mo ago
Mar 20th, 2026
Sublime Security
Spam: Sexually explicit content with emoji in subject from freemail provider
1mo ago
Mar 10th, 2026
Sublime Security
BEC/Fraud: Romance scam
1mo ago
Mar 9th, 2026
Sublime Security
Request for Quote or Purchase (RFQ|RFP) with suspicious sender or recipient pattern
1mo ago
Mar 9th, 2026
Sublime Security
BEC with unusual reply-to or return-path mismatch
1mo ago
Mar 3rd, 2026
Sublime Security
Reconnaissance: Email address harvesting attempt
1mo ago
Feb 23rd, 2026
Sublime Security
Canva infrastructure abuse
2mo ago
Feb 6th, 2026
Sublime Security
ClickFunnels link infrastructure abuse
2mo ago
Feb 5th, 2026
Sublime Security
Impersonation: Executive using numbered local part
2mo ago
Jan 30th, 2026
Sublime Security
Reconnaissance: Hotel booking reply-to redirect
2mo ago
Jan 27th, 2026
Sublime Security
Reconnaissance: Short generic greeting message
2mo ago
Jan 27th, 2026
Sublime Security
Google services using g.co shortlinks
3mo ago
Jan 12th, 2026
Sublime Security
Attachment: PDF file with link to fake Bitcoin exchange
3mo ago
Jan 12th, 2026
Sublime Security
COVID-19 themed fraud with sender and reply-to mismatch or compensation award
3mo ago
Jan 12th, 2026
Sublime Security
Honorific greeting BEC attempt with sender and reply-to mismatch
3mo ago
Jan 12th, 2026
Sublime Security
Brand impersonation: Hulu
3mo ago
Jan 12th, 2026
Sublime Security
Callback phishing: AOL senders with suspicious HTML template or PDF attachment
3mo ago
Jan 12th, 2026
Sublime Security