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
Brand impersonation: Zoom via lookalike domain
11h ago
Jun 22nd, 2026
Sublime Security
Employee impersonation: Payroll fraud
5d ago
Jun 18th, 2026
Sublime Security
Evasion: Hidden content divs from freemail sender
6d ago
Jun 17th, 2026
Sublime Security
Reconnaissance: Short generic greeting message
6d ago
Jun 17th, 2026
Sublime Security
Link: Observed URL pattern with specific domain registrar
11d ago
Jun 12th, 2026
Sublime Security
Attachment: Canva PDF with susupicious author metadata
18d ago
Jun 5th, 2026
Sublime Security
Spam: Default Microsoft Exchange Online sender domain (onmicrosoft.com)
18d ago
Jun 5th, 2026
Sublime Security
BEC/Fraud: Job scam fake thread or plaintext pivot to freemail
18d ago
Jun 5th, 2026
Sublime Security
Attachment: Callback phishing solicitation via pdf file
18d ago
Jun 5th, 2026
Sublime Security
Constant Contact link infrastructure abuse
18d ago
Jun 5th, 2026
Sublime Security
BEC with unusual reply-to or return-path mismatch
18d ago
Jun 5th, 2026
Sublime Security
BEC/Fraud: Penpal scam
18d ago
Jun 5th, 2026
Sublime Security
ClickFunnels link infrastructure abuse
18d ago
Jun 5th, 2026
Sublime Security
Credential phishing: Engaging language and other indicators (untrusted sender)
18d ago
Jun 5th, 2026
Sublime Security
VIP Impersonation via Google Group relay with suspicious indicators
18d ago
Jun 5th, 2026
Sublime Security
Service abuse: Google Groups callback scam
19d ago
Jun 4th, 2026
Sublime Security
Scam: Fake estate sale offering welding equipment and tools
1mo ago
May 12th, 2026
Sublime Security
Service Abuse: Zoom with freemail reply-to and recipient address in greeting
1mo ago
May 6th, 2026
Sublime Security
BEC/Fraud: Student loan callback phishing
1mo ago
May 4th, 2026
Sublime Security
Impersonation: Suspected supplier impersonation with suspicious content
1mo ago
May 4th, 2026
Sublime Security