New Zero-Day Ransomware Evades Microsoft, Google Cloud Malware Detection

Google Drive and Microsoft Office 365, both of which have built-in malware protection, failed to identify a new form of Gojdue ransomware dubbed Shurl0ckr. The zero-day ransomware evaded most major antivirus platforms: only seven percent of 67 tested tools detected it.

Researchers on the Bitglass Threat Research Team discovered Shurl0ckr during a scan of malware in the cloud. It was confirmed as a form of ransomware-as-a-service by Cylance. Shurl0ckr works the same way as Satan ransomware. A hacker creates a ransomware payload and distributes it via phishing or drive-by download. The malware encrypts files on disk in the background until the victim pays a Bitcoin ransom. Hackers pay a percentage to the author.

The discovery was part of a broader study on malware in the cloud. Researchers found 44% of businesses they scanned had some form of malware in at least one of their cloud applications. One in three corporate instances of SaaS applications were infected with malware.

Read more about Shurl0ckr ransomware, and about the findings of the study on malware in the cloud which lead to the discovery of this new threat, on DarkReading.

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