Drive-by download

Website code which silently downloads files unbeknownst to the user

Drive-by downloads occur when a malicious website, or a legitimate site which has been compromised, includes code which exploits security flaws in visitors' browsers to download and execute malware without user interaction.

Drive-by downloads often occur silently and without interaction from the user, attempting to install malware on their system without alerting them to its presence.

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The Japanese government is reported to have commissioned a 'defensive virus'. Is 'defensive' malware ever a good idea?
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