Advanced Threat Prevention: Simultaneous Analysis with Multiple Anti-Malware Engines

Multiscanning is an advanced threat detection and prevention technology that increases detection rates, decreases outbreak detection times, and provides resiliency for single vendor anti-malware solutions.

OPSWAT pioneered Multiscanning to deliver enhanced protection to its customers from a variety of cyber threats.

Illustration of Parallel Multiscanning

A single antivirus engine can detect 40%-80% of malware / viruses. OPSWAT Multiscanning allows you to scan files with over 30 anti-malware engines on-premises and in the cloud to achieve detection rates greater than 99%.

See our full list of AV engine partners.


  • Malware can easily bypass a single antivirus (AV) engine and put your organization at risk.
  • Different AV vendors have different response times to outbreaks due to their location and focused markets.
  • False positives in virus detection is a common side-effect in any malware scanning solution.
  • Integrating multiple AVs into a single platform is challenging and hard to manage.
  • Data privacy risks increase when uploading to a cloud detection system.

OPSWAT Multiscanning Benefits

Improve Malware Detection

Research shows that as more anti-malware engines are added, malware detection rates improve. Each individual engine specializes in different categories and may not detect certain types of threats. Since each anti-malware engine uses different algorithms, the value of combining multiple anti-malware engines significantly increases detection. Combining the inputs from analysts located in various malware labs around the globe improves response for localized attacks.

As shown in our Multiscanning test of more than 10,000 of the most active threats, we achieved over 90 percent detection with 12 combined engines, over 97 percent detection with 16 engines, and over 99 percent detection with 20 or more engines.

How Multiscanning Improves Malware Detection to top 10,000 Threats

Improve Outbreak Exposure Times

During malware outbreaks the time it takes to detect a new threat is critical. Even small changes in detection rates can add days, weeks or months to the time it takes for various anti-malware engines to respond to emerging threats. conducted a test that shows that the detection mechanisms used by different anti-malware engines are faster at detecting certain malware compared to others. By combining the results of multiple scanning engines, we can reduce outbreak exposure times and achieve virtually zero exposure.

These gaps in detection are cause for concern because they expose organizations that use only a single anti-malware engine that hasn't yet detected a specific threat. For example, the Nemucod.KP trojan was initially detected by three anti-malware engines on March 16th, 2016. Within two days eleven anti-malware engines had detected the threat, and after one week sixteen engines had detected it. But months later, 24 engines still had not detected the Nemucod.KP threat.

The ability for multiscanning to dramatically reduce the exposure gaps of using one or a small number of anti-malware engines makes it a valuable approach for the early detection of emerging and actual outbreaks.

How Multiscanning Improves Outbreak Exposure

Low False Positives

False positives, where files are reported as malicious when they are not, surface as a side-effect of any malware scanning solution, and can adversely affect business operations. To further complicate the issue, false positives are often only reported by a few anti-malware vendors at a time, and they are not always consistent or reproducible during testing.

False positive rates are reduced because many malware vendors work together through malware data sharing programs. This means that vendors work together to help codify true positives and false positives, so that overlapping vendor data has fewer false positives, thus improving the results of using multiscanning.

Also, vendors share allowlist (trusted file) data. Our allowlist database accumulates the data from many vendors, which also reduces false positive detection rates.

Every engine returns some false positives, but it is incorrect to assume that using two engines results in double the number of false positives. Overlap in the detection of false positives using multiscanning limits the number of new false positives added by each new engine, as our multiscanning research demonstrates. When we use more engines, the number of false positives does go up, but only by a small, fractional amount, which is outweighed by the many benefits of multiscanning.

OPSWAT Multiscanning Has Low False Positives

Enhanced Performance

Scanning with multiple engines takes slightly longer than scanning with a single engine, but with our multiscanning methods, performance loss is minimized. Our methods take into account redundant tasks such as opening archives and detecting file types, and we also leverage the fact that various engines specialize in detecting threats in specific file types. This means that many multiscanning tasks can be parallelized by using methods like distributed computing, multi-core processing and scanning in memory.

OPSWAT Multiscanning Has Enhanced Performance

Reduce Exposure from Vendor Issues

With multiscanning, you can avoid exposures caused by the potential limitations of a single vendor. This could be a technology issue, like a particular vendor being unable to detect a vulnerability because of a technical limitation, or it could be a business reason, like a vendor not being allowed to operate in certain geographic regions or government agencies.

Over-reliance on a single vendor can prove challenging, but these issues are avoided with multiscanning approaches. Multiscanning also gives you the flexibility of removing a problematic vendor from your deployment environment if vendor issues occur.

Low Total Cost of Ownership (TCO)

Because multiscanning requires multiple anti-malware engines from various vendors, cost is a factor. However, we partner with vendors to deliver optimized multiscanning engine package options to provide beneficial Total Cost of Ownership (TCO) over time. By serving as a single point of contact, we reduce complexity in multiple scanning deployments for our global client base of government entities and organizations in virtually every industry including other security firms, aerospace and defense, healthcare services, critical infrastructure, and supply chain manufacturing.

OPSWAT Multiscanning has enabled us not only to improve our incident response quality but also to ensure safety of customer information by allowing us to scan files with a private, on-premises solution.

Koji Tashima
IT Security Analyst, NRI

OPSWAT Worldwide Anti-Malware Vendor Distribution

OPSWAT Multiscanning Vendor Distribution

OPSWAT Products That Use Multiscanning

Schedule a meeting with our OPSWAT technical experts to learn more about Multiscanning