Hello,
Nice Question.
Auto-Protect-- Scans whenever a file is accessed or modified in memory Real Time.
Auto-Protect is the first line of defense against threats by providing real-time protection for your computer. Whenever you access, copy, save, move, open or close a file, Auto-Protect scans the file to ensure that a threat has not attached itself. By default, it loads when you start your computer to guard against threats and security risks. It also monitors your computer for any activity that might indicate the presence of a threat or security risk. Auto-Protect can determine a file's type even when a threat changes the file's extension.
Note: Auto-Protect does not function on Linux platforms, you must run a manual scan on those machines to detect threats.
Example: A threat changes a file's extension to one that is different from what you configured Auto-Protect to scan. When a threat, threat-like activity (an event that could be the work of a threat), or a security risk is detected, Auto-Protect alerts and takes the necessary steps to either clean, quarantine, delete or leave alone (log only) the detection of a threat depending upon the Actions configured for each detection type.
In your case, Auto-Protect didn't detect it as the Threat didn't exploit any vulerability of Java while it was being copied.
Probably, Auto-Protect may have detected this, if the file was Ran after the file got copied and it started exploiting the Vulerability of Java.
Full Scan-- It wIll scan each file by starting with A to Z its not real time..Its manual or scheduled.
A Full system scan are the antivirus and antispyware scans that detect known viruses and security risks. For the most complete protection, you should schedule occasional scans for your client computers. Unlike Auto-Protect, which scans files and email as they are read to and from the computer, A Full system scans detect viruses and security risks.
A Full system scan detect viruses and security risks by examining all files and processes (or a subset of files and processes). A Full system scan can also scan memory and load points.
A Full system scan does these...
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Scans the system memory and all the common virus and security risk locations.
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Scans the entire computer for viruses and security risks, including the boot sector and system memory.