Can computer virus spread via e-mail too?give an example to explain your answer
Answers
Answer:
Yes
Explanation:
Computer viruses, trojans, and other malware infects your computer when an e-mail attachment is ran from an e-mail. If while reading an e-mail you double-click, run, or save any attachment and that attachment is infected with a virus your computer will then become infected.
Explanation:
Yes. Generally from attachments. It's how most people get viruses. Joe gets an email "Dear joe, please pay the attached invoice for $948.45". He gets lots of invoices, it's his job. There's an attachment, a zipfile "invoice.zip". He opens the zipfile, sees a file "invoice". It's actually "invoice.js", but Windows hides extensions, and has a funny icon. It's not an icon for a JPEG or a PDF, but it's not a skull-and-crossbones. He opens it. No prompts, no warnings. It's a javascript file, which in Windows is passed to Internet Explorer (even if the user prefers another browser). IE silently in the background goes online and downloads an executable file from a recently created website, then transfers control to the executable. Which is a cryptolocker virus, which proceeds to encrypt files both locally and to writable network shares. There is no antivirus warning for either the script arriving in email or for the script running, or the executable, because they are both new variants that will not be in the antivirus databases for some 14-odd hours, if not longer. One one Windows variant I tested, there was no prompt at all. On another, a popup "do you want to run this program?".
Now, weeks later, it's in most antivirus databases and in Windows Defender. The infected email now would never make it onsite. The website is probably in a list of "malicious websites", but it's gone offline anyway.For that 14-hour window, the only thing that could have protected Joe was his own instincts. He might have been suspicious that it said "Dear joe" rather than "Dear Joe Bloggs" or "Dear Joe" (his email address is '[email protected]'). Or he might have been suspicious that it does not say in the message what company it is from. But he probably gets the odd scanned paper invoice like that from "a xerox scanner", at least internally to his workplace, and so it may not be as suspicious to him as to, say, a teen who has never received an invoice in her life.
Email viruses often spread by causing the attachment or malicious message to be sent to everyone in the victim's address book. Email viruses can be packaged and presented in a variety of different ways.
Computer viruses, trojans, and other malware infects your computer when an e-mail attachment is ran from an e-mail. If while reading an e-mail you double-click, run, or save any attachment and that attachment is infected with a virus your computer will then become infected.
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