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A computer virus is a program or piece of code that tends to be malicious and is loaded onto your computer without your knowledge and runs against your wishes.

235 votes
Accepted

How are anti viruses so fast?

Disclosure: I work for an anti-virus vendor. … Because most anti-virus engines were born as protecting endpoints, and even now for many of them endpoint protection is major part of business, the modern anti-virus engines are optimized for scanning …
George Y.'s user avatar
  • 3,544
100 votes
Accepted

Why is so much ransomware breakable?

Disclosure: I work for one of vendors participating in NoMoreRansom. Most modern ransomware indeed implements proper cryptography. Earlier versions were using rand() for key generation, seeding the r …
George Y.'s user avatar
  • 3,544
2 votes

Can HDD without OS contain active virus

Yes, an HDD without OS can contain active virus. For example, one of NSA implants can install itself into the hard drive firmware. …
George Y.'s user avatar
  • 3,544
1 vote

How should I more securely store files obtained by mirroring a website?

Since you asked about storage, my answer would focus on storing potentially infected files, and not on working with potentially infected files (which is a very different issue). All the file types yo …
George Y.'s user avatar
  • 3,544
1 vote

How can I determine if a malware sample is morphic? (polymorphic, metamorphic, etc)

It depends on whether you want polymorphic or metamorphic. Polymorphic usually means the malware which is capable of changing itself while distributing itself. So first thing to determine is whether …
George Y.'s user avatar
  • 3,544