What it does: New threats always require new scanners and
scanning techniques. When rootkit pests emerged, previous scanners could not
detect them from a purely technical point of view. Because the AV scanner uses
the usual access options of the operating system to a file. However, a rootkit
could trick the operating system and make itself invisible to the system and
thus also to the virus scanner. The AV manufacturers subsequently developed
rootkit scanners, which they also built into their antivirus programs.
Something similar happened with the advent of ransomware, which encrypts user
files. medicalnewstodayblog
In order to better recognize these pests, scanners were
developed that can detect an encryption process on the system. At that moment
they look for the trigger for the encryption and stop this program. There are
also scanners that can scan the memory or content of a website for malicious
code. The vast majority of scanners of this type were first loudly promoted by
the antivirus manufacturers as a new tool or function and then later became an
integral part of the antivirus program. businessrobotic
Other scanners are offered as so-called removal tools or
cleaning tools. They either take care of a specific pest and the damage it
does, or they can clean up many of the common viruses. Examples of specialized
tools can be found on the website www.nomoreransom.org. There you will find
utilities that can decrypt files encrypted by ransomware - without paying a
ransom. The Norton Power Eraser is a universal cleaning tool. techwadia
Fake
Antivirus: How to Spot Fraudulent Programs
Scan
engines
The scanners mentioned above are usually based on several
scan engines, some of which differ significantly in their functionality. treasurebiz
Signature-based
scans
This is what it does: A virus signature usually consists of
a piece digitaltechspot of known code from a virus. The scanner checks whether a file contains
this part of the code. If so, the file is detected as a virus. For this to
work, the AV manufacturer must have analyzed the virus in their laboratory in
order to be able to create the virus signature. Then the signature must be
distributed to all installed antivirus programs. That is why it is so important
to always provide an AV tool with updates. bizautomotive
