VirusTotal

VirusTotal is a web application that inspects items with over 70 antivirus scanners and URL/domain blacklisting services. In addition, it uses other tools and services to extract additional signals from the given sample.

In other words, a user can upload a suspicious file, link or piece of information and have it scanned for any possible malicious contents or origin.

VirusTotal services consist of:

- File scanning

- URL/Domain scanning

- IP Address

- File Hashes

NOTICE: All the information uploaded on VT are passing through an external database publicly. Therefore, never use VT to upload sensitive information that you don't want to make public.

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RKill

In some cases, a malware that have infected a machine might execute processes that disable the computer's antivirus software and keeping it disabled as long as that process is running. Rkill is a free software that can be used to identify known malware processes running on a machine and terminate them. Note that this tool does not remove viruses, it just stops their processes so that the user will be able to run a scan with their antivirus or manually clean the  malicious file. If the malware is not cleared, the terminated processes will start running again when the computer restarts.