- Published
- Source
- Unit 42
- Filed under
- Malware & exploits
- Technique
- T1566 Phishing (opens in a new tab)
Unit 42 details the top initial access vectors adversaries use to breach organizations, led by edge exploits, credential abuse and phishing…
Keeping malware out
- Keep operating systems, browsers and plugins patched – most malware arrives through known holes.
- Block macros and scripts from the internet, and let only approved software run where you can.
- Watch endpoint alerts for new persistence: scheduled tasks, services and run keys.
More helpNCSC: mitigating malware and ransomware attacks (opens in a new tab)
Defender’s notebook
The attacker technique behind this story, in MITRE’s terms – and what to check in your own estate.
Phishing
Initial AccessWhat a defender checks
- Search mail flow for the sender, subject and links, and pull every copy from mailboxes.
- Check who clicked or replied, and what signed in afterwards.
- Block the sender and URLs, and tell staff what to look for.
Build the skillBlue Team Analyst · Email & Phishing Investigation
© 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. MITRE ATT&CK and ATT&CK are registered trademarks of The MITRE Corporation.
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