noun
botnet
A network of compromised computers controlled remotely, often used for malicious activities like DDoS attacks or spam distribution.
ボットネットに感染したパソコンが大量のスパムを送信していた。
Computers infected by the botnet were sending out large amounts of spam.
マルウェア is a general term for malicious software, while ボットネット specifically refers to a network of infected devices controlled as a group.
DDoS攻撃 is a type of attack often carried out using a botnet, but the botnet itself is the tool or infrastructure, not the attack.
Borrowed from English 'botnet', a blend of 'robot' and 'network'.