Netskope: 43.7% of cloud malware is known to deliver ransomware

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Nearly half of all malware found in business cloud applications is ransomware, according to new research.

Netskope, a cloud security specialist, has released a study revealing that 43.7 per cent of cloud malware is known to deliver ransomware. These include Javascript exploits and droppers, Microsoft Office macros and PDF exploits.

The figures have been derived from trends seen from April 1st to June 30th 2016.

In its Cloud Report, Netskope said that levels of backdoor and Linux malware rose during this period, from 4.9 per cent and negligible last quarter to 23.1 per cent and 18.4 per cent, respectively. Mobile malware, spyware and adware, Mac malware and other forms made up the remaining 14.8 per cent.

The study also revealed that 55.9 per cent of cloud malware files discovered in sanctioned apps are shared with internal or external users or publicly.

According to the study, enterprises have an average of 977 cloud apps in use, compared to 935 in the last quarter. Microsoft still has the most apps in the top 20 list, with its Office 365 OneDrive for Business being the most used, displacing Facebook from the top spot in terms of app sessions.

Netskope recommended that businesses use a cloud access security broker (CASB) to detect and combat any ransomware affecting files in cloud applications. The firm also recommended enabling the versioning function in cloud services, including Box, Dropbox, Microsoft OneDrive, Google Drive, to force encrypted files to return to their last known clean version and fully recover from ransomware attacks.

In the report, Netskope said: “With these threats often delivered through phishing and email attacks, security teams should consider training sessions for employees on spotting suspicious emails and not opening attachments from unknown sources or suspicious email addresses.”