Deleting the file is necessary if the entire file is a virus.īecause new viruses are being created each day, the signature based detection approach requires frequent updates of the virus signature dictionary. If a file repair operation doesn't work, often the best thing to do is to just delete the file. The third action antivirus software can take against a virus is deleting it.
Unfortunately, some viruses might damage the file upon injection, which means repairing it will fail. To do this, the software will try to remove the viral code from the file. Sometimes a user wants to save the content of an infected file (because viruses can sometimes embed themselves in files, called injection.) To do this, antivirus software will attempt to repair the file. Encrypting the file is a good quarantining technique because it renders the file useless. Quarantining a file will make it inaccessible, and is typically the first action antivirus software will take if a malicious file is found. Antivirus software will usually perform one or more of the following actions quarantining, repairing, or deleting. If a virus signature is found in a file, the antivirus software can take action to remove the virus. So, saying you found a virus signature in a file is the same as saying you found the virus itself. When antivirus software scans a file for viruses, it checks the contents of a file against a dictionary of virus signatures. This method is somewhat limited by the fact that it can only identify known viruses, unlike other methods.
Signature-based detection is the most common method that antivirus software uses to identify malware. Identification methods Signature-based detection
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