Multiscanning

Reason

Testing agencies published results showing that no single antivirus engine is 100% effective against every malware threat. Because each engine uses different scanning methodologies and updates their malware definition files at various frequencies, using multiple engines increases the likelihood of catching malware before it can affect a system or network.

Notable vendors

• F-Secure – Combines an in-house engine with Avira's engine.
• G Data AntiVirus – Combines in-house and BitDefender's engines. avast has been removed with version 2014.
• HitmanPro – Combines an in-house behavioral engine with a cloud containing engines from Kaspersky Lab, BitDefender and Sophos.
• Lavasoft Ad-Aware – Combines an in-house anti-spyware engine with Bitdefender's engine.
• Microsoft Forefront – Combines the engines of Authentium, Kaspersky, Norman and VirusBuster, with its own in-house engine.
• OPSWAT MetaDefender Cloud – Combines over 30 anti-malware engines to scan files for malware. Also available on-premise.
• Qihoo 360 Internet Security use Bitdefender Engine, QVM 2 Engine, 360 Cloud engine. But, the Chinese version includes the Avira engine additionally.
• TrustPort Antivirus – Combines the engines of BitDefender and AVG.
• VirusTotal

References

References

1. [http://www.smartcomputing.com/editorial/article.asp?article=articles%2F2003%2Fs1407%2F38s07%2F38s07.asp Clash Of The Antivirus Apps]. Smart Computing Article (5 January 2007). Retrieved on 2012-02-29.
2. Dell]. Support.dell.com (15 March 2005). Retrieved on 2012-02-29.
3. [http://www.gfi.com/whitepapers/why-one-virus-engine-is-not-enough.pdf Why one virus engine is not enough] {{Webarchive. link. (7 December 2010 . GFI White Paper. gfi.com)
4. [http://www.av-test.org/certifications.php AV-TEST.org]. [[AV-TEST]]. Retrieved on 2012-02-29.
5. [http://blogs.technet.com/b/forefront/archive/2007/10/19/the-advantage-of-multiple-anti-virus-engines-on-server-products.aspx The advantage of multiple anti-virus engines on server products – Forefront Team Blog – Site Home – TechNet Blogs]. Blogs.technet.com (19 October 2007). Retrieved on 2012-02-29.
6. [http://www.tomsguide.com/us/Bitdefender-Carrier-IQ-Android-Rootkit-Mobile-Security,news-13394.html Bitdefender Releases Carrier IQ Finder for Android].
7. [http://www.pcworld.com/reviews/product/61695/review/internet_security_2010.html Complete coverage of the G Data Internet Security 2010 Antivirus & Security Software]. PCWorld (28 May 2009). Retrieved on 2012-02-29.
8. HitmanPro
9. link. (12 May 2010 . Dark Reading (5 May 2010). Retrieved on 2012-02-29.)
10. [https://www.opswat.com/products/metadefender/api MetaDefender Core – Advanced Threat Prevention Development Platform]