Netskope named a Leader in the 2022 Gartner® Magic Quadrant™ for Security Service Edge. Get the Report.

  • Products

    Netskope products are built on the Netskope Security Cloud.

  • Platform

    Unrivaled visibility and real-time data and threat protection on the world's largest security private cloud.

Netskope Named a Leader in the 2022 Gartner Magic Quadrant™ for SSE Report

Get the report Go to Products Overview
Netskope gartner mq 2022 sse leader

Netskope delivers a modern cloud security stack, with unified capabilities for data and threat protection, plus secure private access.

Explore our platform
Birds eye view metropolitan city

Make the move to market-leading cloud security services with minimal latency and high reliability.

Learn more
Lighted highway through mountainside switchbacks

Prevent threats that often evade other security solutions using a single-pass SSE framework.

Learn more
Lighting storm over metropolitan area

Zero trust solutions for SSE and SASE deployments

Learn more
Boat driving through open sea

Netskope enables a safe, cloud-smart, and fast journey to adopt cloud services, apps, and public cloud infrastructure.

Learn more
Wind turbines along cliffside
  • Customer Success

    Secure your digital transformation journey and make the most of your cloud, web, and private applications.

  • Customer Support

    Proactive support and engagement to optimize your Netskope environment and accelerate your success.

  • Training and Certification

    Netskope training will help you become a cloud security expert.

Trust Netskope to help you address evolving threats, new risks, technology shifts, organizational and network changes, and new regulatory requirements.

Learn more
Woman smiling with glasses looking out window

We have qualified engineers worldwide, with diverse backgrounds in cloud security, networking, virtualization, content delivery, and software development, ready to give you timely, high-quality technical assistance.

Learn more
Bearded man wearing headset working on computer

Secure your digital transformation journey and make the most of your cloud, web, and private applications with Netskope training.

Learn more
Group of young professionals working
  • Resources

    Learn more about how Netskope can help you secure your journey to the cloud.

  • Blog

    Learn how Netskope enables security and networking transformation through security service edge (SSE).

  • Events & Workshops

    Stay ahead of the latest security trends and connect with your peers.

  • Security Defined

    Everything you need to know in our cybersecurity encyclopedia.

Security Visionaries Podcast

Bonus Episode: The Importance of Security Service Edge (SSE)

Play the podcast
Black man sitting in conference meeting

Read the latest on how Netskope can enable the Zero Trust and SASE journey through security service edge (SSE) capabilities.

Read the blog
Sunrise and cloudy sky

SASE Week

Netskope is positioned to help you begin your journey and discover where Security, Networking, and Zero Trust fit in the SASE world.

Learn more
SASE Week

What is Security Service Edge?

Explore the security side of SASE, the future of network and protection in the cloud.

Learn more
Four-way roundabout
  • Company

    We help you stay ahead of cloud, data, and network security challenges.

  • Why Netskope

    Cloud transformation and work from anywhere have changed how security needs to work.

  • Leadership

    Our leadership team is fiercely committed to doing everything it takes to make our customers successful.

  • Partners

    We partner with security leaders to help you secure your journey to the cloud.

Netskope enables the future of work.

Find out more
Curvy road through wooded area

Netskope is redefining cloud, data, and network security to help organizations apply Zero Trust principles to protect data.

Learn more
Switchback road atop a cliffside

Thinkers, builders, dreamers, innovators. Together, we deliver cutting-edge cloud security solutions to help our customers protect their data and people.

Meet our team
Group of hikers scaling a snowy mountain

Netskope’s partner-centric go-to-market strategy enables our partners to maximize their growth and profitability while transforming enterprise security.

Learn more
Group of diverse young professionals smiling
Blog Threat Labs Detecting Ransomware on Unmanaged Devices
Aug 31 2022

Detecting Ransomware on Unmanaged Devices

Summary

“If a tree falls in a forest and no one is around to hear it, does it make a sound?”

If an unmanaged device is infected with ransomware, will the security operations team receive an alert? Consider a contractor or employee who uses their personal laptop for work. If that device becomes infected with ransomware, not only does it pose a risk to the organization’s data and a risk to other devices within the organization, but the device is not centrally managed. How does the security operations team know that an unmanaged device was infected with ransomware? In this blog post, we will illustrate how you can detect a ransomware infection on an unmanaged device by monitoring uploads to managed cloud apps.

Approach

In the past we have discussed the MO of multiple ransomware variants such as DearCry, Khonsari, LockBit, and Hive, to name a few. In most of these cases, ransomware operators deploy the malware on corporate devices, steal the information from these devices, and encrypt the contents before asking for a ransom. 

While smaller organizations can effectively keep an eye on a small set of employees, a larger organization is going to have more of a challenge monitoring all of the devices within the corporation. This is something that plays to the ransomware operator’s advantage, and is exacerbated when the devices that access sensitive data are not managed. In these situations, the standard ransomware monitoring setup might encounter some detection challenges due to a lack of visibility. 

However, there is a detection opportunity here via cloud applications. Users often install clients for the cloud applications they use on their machines, such as Microsoft OneDrive or Dropbox. These clients monitor the local file system for any file modifications and then sync the changes up to the cloud application. This is particularly useful for collaboration among teams that need to edit the same Word, Excel, or Powerpoint documents. When ransomware infects a machine that has a client installed and starts encrypting a large amount of files, these changes are also pushed up to the cloud provider.

Detection

Netskope detects ransomware on unmanaged devices by monitoring managed cloud apps for signs of a ransomware infection. Netskope’s Advanced UEBA platform uses a combination of heuristics, machine learning, and threat intelligence to identify two specific signs:

  • A user suddenly uploads a large number of encrypted files to a managed cloud app. Netskope uses a combination of heuristics and machine learning to identify encrypted files. Because ransomware typically encrypts all of a victim’s documents very quickly, a sudden spike of encrypted files uploaded to a cloud app is a telltale sign of ransomware infection.
  • A user uploads files that use a known ransomware extension. Many ransomware families use a file extension that is specific to that ransomware family and are rarely used otherwise. Netskope detects ransomware by monitoring file uploads containing these extensions.

As an example, Netskope recently detected an AvosLocker infection by identifying both of these signs:

  • Multiple users uploaded thousands of encrypted files to a managed Microsoft 365 OneDrive account.
  • All of the encrypted files had a file extension of avos2, a file extension associated with AvosLocker. 

The diagram below shows how Netskope was able to detect the ransomware infection, even though it only affected unmanaged devices. The unmanaged devices uploaded the AvosLocker encrypted files to the managed OneDrive account. The OneDrive account was monitored by Netskope API Data Protection and Advanced UEBA which detected the ransomware-encrypted files and generated alerts for each of the infected users.

Diagram showing ransomware detection process

Protection

Below you will find a screenshot of the Netskope Advanced UEBA console, which includes a view of the User Confidence Index (UCI). The UCI is a risk score assigned to each user by Netskope. If the user presents no risk, then the score is 1,000, and each behavioral anomaly deducts some amount from that score to indicate the risk they pose to the organization.

The screenshot below shows the UCI at the top, and then it itemizes the anomalies below the timeline. In this example, the user’s confidence score goes from 1,000 to 0 in one day due to the ransomware infection, indicated by the uploads of encrypted files with ransomware extensions to a managed cloud app.

Chart showing user confidence index (UCI) score changes

The UCI score changes may not always drop to zero, as it did in this example. Even slight changes in UCI can be used in adaptive access policies to provide real-time coaching on risky behaviors, limiting specific app activities, and controlling data movement between company and personal instances of managed apps. 

Netskope’s Advanced UEBA has more than 55 detections for insiders, compromised accounts, and devices. Learn more about it here.

author image
About the author
Colin Estep has 16 years of experience in software, with 11 years focused on information security. He's currently a researcher at Netskope, where he focuses on security for AWS and GCP.
Colin Estep has 16 years of experience in software, with 11 years focused on information security. He's currently a researcher at Netskope, where he focuses on security for AWS and GCP.