Answer:
A zero-day attack.
Explanation:
A Zero-day vulnerability is a computer-software vulnerability that is unknown to, or unaddressed by, the security community or software developer or even the vendor of the target software. Until the vulnerability is mitigated, hackers can exploit it to adversely affect computer programs, data, additional computers or a network.
An exploit directed at a software with zero-day vulnerability & exploiting this vulnerability is called a zero-day exploit, or zero-day attack.
Phishing, scam, Fraud, just to get to hack your computer.
...something that the user knows.
Answer:
The CPU dye or the tiny resistors
Explanation:
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I would say probably the CPU Fan and the CPU clock speed
