Process Explorer by Sysinternals(Microsoft) is a more advanced alternative to Windows Task Manager
VirusTotal.com is a multi-engined scanner service from Google with more than 50 different anti-virus products including:
AVG, Avast, Avira, BitDefender, ESET, F-Secure, GData, Kaspersky, Malwarebytes, Microsoft, Norman, Panda, SUPERAntiSpyware, Sophos, Symantec, TrendMicro and many more.
The VirusTotal integration in Process Explorer is very fast because it only sends file hashes, a unique content identifier, and not the files itself. It's dependent of previous scans on VirusTotal for every specific file and version, but because VirusTotal is a heavily used worldwide service you often get fresh results for most files.
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