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
Reconnaissance: Short generic greeting message
4d ago
May 29th, 2026
Sublime Security
Credential phishing: Engaging language and other indicators (untrusted sender)
4d ago
May 29th, 2026
Sublime Security
Scam: Fake estate sale offering welding equipment and tools
21d ago
May 12th, 2026
Sublime Security
Service Abuse: Zoom with freemail reply-to and recipient address in greeting
27d ago
May 6th, 2026
Sublime Security
Callback phishing: AOL senders with suspicious HTML template or PDF attachment
29d ago
May 4th, 2026
Sublime Security
Callback phishing via Google Group abuse
29d ago
May 4th, 2026
Sublime Security
BEC/Fraud: Student loan callback phishing
29d ago
May 4th, 2026
Sublime Security
Impersonation: Suspected supplier impersonation with suspicious content
29d ago
May 4th, 2026
Sublime Security
Canva infrastructure abuse
29d ago
May 4th, 2026
Sublime Security
Callback phishing via Intuit service abuse
29d ago
May 4th, 2026
Sublime Security
Employee impersonation: Payroll fraud
1mo ago
May 1st, 2026
Sublime Security
BEC/Fraud: Scam lure with freemail pivot
1mo ago
Apr 30th, 2026
Sublime Security
BEC/Fraud: Penpal scam
1mo ago
Apr 30th, 2026
Sublime Security
Link: Google Calendar invite linking to an open redirect from an untrusted freemail sender
1mo ago
Apr 28th, 2026
Sublime Security
Attachment: Calendar invite with suspicious link leading to an open redirect
1mo ago
Apr 28th, 2026
Sublime Security
BEC/Fraud: Job scam fake thread or plaintext pivot to freemail
1mo ago
Apr 27th, 2026
Sublime Security
COVID-19 themed fraud with sender and reply-to mismatch or compensation award
1mo ago
Apr 27th, 2026
Sublime Security
Suspicious request for financial information
1mo ago
Apr 27th, 2026
Sublime Security
Request for Quote or Purchase (RFQ|RFP) with suspicious sender or recipient pattern
1mo ago
Apr 27th, 2026
Sublime Security
BEC/Fraud: Urgent language and suspicious sending/infrastructure patterns
1mo ago
Apr 17th, 2026
Sublime Security