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The Cloud Is Infested With Malware
Quote:Bitglass and its antivirus technology partner Cylance identified a new variant of the Gojdue ransomware called ShurL0ckr. Although Microsoft’s antivirus can detect Gojdue, according to Bitglass, neither Office 365’s built-in anti-malware protection nor Google Drive’s own built-in antivirus were able to detect the ShurL0ckr variant.

Only five of the 67 antivirus engines leveraged by VirusTotal were able to detect ShurL0ckr, with Cylance’s own antivirus being one of them.

The Bitglass team also scanned tens of millions of cloud-hosted files and discovered a high-rate of infection in cloud applications, as well as a low-efficacy rate in detecting infected malware even from the cloud services that come with built-in antivirus protection.

According to the research team, 44% of the cloud services companies had some form of malware in at least one of their applications. The company found that Microsoft’s OneDrive saw the highest number of infected files (55%), with Google Drive following it closely at 43%. A third of Dropbox and Box-hosted files were found to be infected, too.

Bitglass also identified the top file categories by infection rate. Perhaps unsurprisingly, the most common by far are scripts and executables (42%), which can launch malicious applications with a single click. Microsoft Office files was the second most common type of infected files (21%), because enterprise users tend to open them without hesitation.

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