exfil

Noun

exfiltration (countable and uncountable, plural exfiltrations)

1. The process of exiting an area (usually behind enemy lines or in enemy territory).
2. A method for managing storm water runoff.
3. A filtering out (usually movement of a substance through a barrier).
4. A gradual movement of a substance to exterior (as through cell membrane to extracellular fluid or medium).
5. (computer security) The covert extraction of data from a system.
   • Phishing is sending emails or other electronic communications to fraudulently or unlawfully induce recipients to reveal personal or sensitive information, such as passwords, dates of birth, Social Security numbers, passport numbers, credit card information, financial information, or other sensitive...2023 July, Microsoft, Microsoft Services Agreement

Verb

exfiltrate (third-person singular simple present exfiltrates, present participle exfiltrating, simple past and past participle exfiltrated)

1. (transitive) To withdraw (troops, operatives, etc.) surreptitiously from a dangerous position.
   • [B]ack in 2017, the CIA had exfiltrated a long-standing source who worked for Putin’s foreign policy chief and had been passing the agency secrets for years. There may be others still in place.2026 February 20, The Guardian
2. (transitive, computer security) To covertly extract data.
   • There are multiple ways to exfiltrate files from a compromised system. Since you have ssh access, you can always use sftp or scp, but I want to show you another way of moving files using netcat.2019 December 5, Course Hero, page 3

See all 3 meanings of exfiltrate