The Future of Zero Trust and SASE is Now! Watch on-demand

close
close
  • Why Netskope chevron

    Changing the way networking and security work together.

  • Our Customers chevron

    Netskope serves more than 3,000 customers worldwide including more than 25 of the Fortune 100

  • Our Partners chevron

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

Highest in Execution. Furthest in Vision.

Netskope recognized as a Leader in the 2023 Gartner® Magic Quadrant™ for Security Service Edge.

Get the report
Netskope recognized as a Leader in the 2023 Gartner® Magic Quadrant™ for Security Service Edge.
We help our customers to be Ready for Anything

See our customers
Woman smiling with glasses looking out window
Netskope’s partner-centric go-to-market strategy enables our partners to maximize their growth and profitability while transforming enterprise security.

Learn about Netskope Partners
Group of diverse young professionals smiling
Your Network of Tomorrow

Plan your path toward a faster, more secure, and more resilient network designed for the applications and users that you support.

Get the white paper
Your Network of Tomorrow
Introducing the Netskope One Platform

Netskope One is a cloud-native platform that offers converged security and networking services to enable your SASE and zero trust transformation.

Learn about Netskope One
Abstract with blue lighting
Embrace a Secure Access Service Edge (SASE) architecture

Netskope NewEdge is the world’s largest, highest-performing security private cloud and provides customers with unparalleled service coverage, performance and resilience.

Learn about NewEdge
NewEdge
Netskope Cloud Exchange

The Netskope Cloud Exchange (CE) provides customers with powerful integration tools to leverage investments across their security posture.

Learn about Cloud Exchange
Netskope video
The platform of the future is Netskope

Intelligent Security Service Edge (SSE), Cloud Access Security Broker (CASB), Cloud Firewall, Next Generation Secure Web Gateway (SWG), and Private Access for ZTNA built natively into a single solution to help every business on its journey to Secure Access Service Edge (SASE) architecture.

Go to Products Overview
Netskope video
Next Gen SASE Branch is hybrid — connected, secured, and automated

Netskope Next Gen SASE Branch converges Context-Aware SASE Fabric, Zero-Trust Hybrid Security, and SkopeAI-powered Cloud Orchestrator into a unified cloud offering, ushering in a fully modernized branch experience for the borderless enterprise.

Learn about Next Gen SASE Branch
People at the open space office
Designing a SASE Architecture For Dummies

Get your complimentary copy of the only guide to SASE design you’ll ever need.

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

Learn about NewEdge
Lighted highway through mountainside switchbacks
Safely enable the use of generative AI applications with application access control, real-time user coaching, and best-in-class data protection.

Learn how we secure generative AI use
Safely Enable ChatGPT and Generative AI
Zero trust solutions for SSE and SASE deployments

Learn about Zero Trust
Boat driving through open sea
Netskope achieves FedRAMP High Authorization

Choose Netskope GovCloud to accelerate your agency’s transformation.

Learn about Netskope GovCloud
Netskope GovCloud
  • Resources chevron

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

  • Blog chevron

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

  • Events and Workshops chevron

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

  • Security Defined chevron

    Everything you need to know in our cybersecurity encyclopedia.

Security Visionaries Podcast

Elections, Disinformation, and Security
This episode takes a look at aspects of election security around voter registration and physical controls at polling places.

Play the podcast
Blog: Elections, Disinformation, and Security
Latest Blogs

Read 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 2023: Your SASE journey starts now!

Replay sessions from the fourth annual SASE Week.

Explore sessions
SASE Week 2023
What is Security Service Edge?

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

Learn about Security Service Edge
Four-way roundabout
  • Company chevron

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

  • Leadership chevron

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

  • Customer Solutions chevron

    We are here for you and with you every step of the way, ensuring your success with Netskope.

  • Training and Certification chevron

    Netskope training will help you become a cloud security expert.

Supporting sustainability through data security

Netskope is proud to participate in Vision 2045: an initiative aimed to raise awareness on private industry’s role in sustainability.

Find out more
Supporting Sustainability Through Data Security
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 talented and experienced Professional Services team provides a prescriptive approach to your successful implementation.

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

Learn about Training and Certifications
Group of young professionals working

The modern Gold Mine Rush – Office 365 as a crypto miner’s paradise

Nov 07 2017
Tags
coin mining
Coinhive
Microsoft Office 365
Netskope Threat Research Labs
Office 365 Security
OneDrive Security

Netskope Threat Research Labs has detected a browser-based coin miner named Coinhive resident in Microsoft Office 365 OneDrive for Business. The Coinhive miner was installed as a plugin in an SSL website. The tutorial webpage hosted on the website was saved to the cloud and then shared within an organization. The presence of browser-based coin miners can consume high computing power and resources without the user’s consent, thereby slowing down CPU performance. Netskope Threat Protection detects the Coinhive miner as Application.BitCoinMiner.SX

As an integral part of threat research, we constantly monitor updates and trends of coin miners. In this ongoing trend of coin mining, a website named ‘Coinhive’ launched a browser plugin script that can perform mining when a web page is loaded, without the need to install software. This coin mining method is intended to provide a new revenue stream that is similar to the ad-revenue model generated by displaying/loading ads while visiting a website.

This surreptitious install of a coin miner in a corporate environment follows with previous publication of Zminer that downloads second stage coin miners from Amazon S3 and also uses the same for data exfiltration. During the analysis of Zminer on August, the market cap of Cryptocurrency was $150 billion. It has now drastically increased to a $200 billion valuation as shown in Figure 1.

Figure 1: Cryptocurrency market cap

Discovery

Earlier this month, Netskope Threat Protection detected a file named coinhive.min.js in Microsoft Office 365 OneDrive for Business. We examined the functionality and found that it is a browser-based plugin coin miner. Using Netskope Discovery and additional details from the Netskope Active Introspection alert, we found the presence of the Coinhive miner in a website named https://www.sky-future[.]net.

An excerpt of the Coinhive code seen in the website is shown in Figure 2.

Figure 2:  Coinhive miner in the website, https://www.sky-future[.]net

Overview of Coinhive

Coinhive is a JavaScript library launched in 2017. It allows a website to use the client computer to mine Monero cryptocurrency offering site owners an alternative to online advertising. The money mined by the browser-based hosted scripts is credited from Coin Hive to the website Owners/Administrators. Using Coinhive, one can get the number of hashes solved for a user account, withdraw hashes, verify tokens and programmatically create short links.

Unlike popular miners, Coinhive does not provide any specific information about the account owner as per the privacy terms.

The mining options provided by the Coinhive constructor is shown in Figure 3.

Figure 3: Coinhive Constructor options

Authedmine

Coinhive miner browser plugin is simple and easy to install. This plugin has been lately adopted by several websites, thus raising concerns about the usage of CPU power and resources without the user’s consent. Approximately, 2.2 percent of the top 100,000 websites on the Alexa list have been reported to be mining through user PCs. To address this, Coinhive launched Authedmine, which enforces an explicit opt-in consent from the end user to run the miner. If the user approves the permission, an opt-in token is stored in a cookie to perform the mining operation. However, this is not a mandatory implementation, thus making all previous solutions to continue to work without the explicit opt-in consent as shown in Figure 4.

Figure 4: Loading the Coinhive miner

Analysis of the Coinhive miner

On visiting the website, https://www.sky-future[.]net, a GET request was called to the Coinhive miner plugin from the browser as shown in Figure 5.

Figure 5: GET request called to the coin hive miner plugin

Since the website owner did not implement the Authedmine option, no explicit opt-in consent is displayed while visiting the website. Hence, any user from the organization is unaware that the corporate machine is used for mining without their knowledge or consent.

The Coinhive config present in the script “coinhive.min.js” contained a list of websocket shards in to perform the mining Figure 6.

Figure 6: Coinhive websocket shards

Using the user key mentioned in Figure 2, Coinhive begins the worker job as shown in Figure 7.

Figure 7 :  Worker job of Coinhive

Since the mining is performed without users’ consent without displaying the explicit opt-in consent, we can give a verdict that the Coinhive miner plugin is carrying out a cryptojacking operation, causing the user’s browser to consume high CPU usage.

Conclusion

Browser-based mining is an innovation and also an alternative revenue generating model. Since the mining operation takes place while visiting the website, we expect an increasing potential of browser miners. This leads to an interesting arena of choosing the option of displaying ads or giving away CPU cycles every time the website is visited. On the same note, this can be a serious concern for organizations who are unaware that the corporate machines are being used for mining without their knowledge or consent. The browser miners can also be abused by malware authors to exploit the victims computing power and resources. As enterprises are rapidly adopting the use of cloud and cloud services, the need for a threat-aware solution and defensive mechanism for SSL inspection is required. After the initial analysis and reporting, the website, https://www.sky-future[.]net removed the Coinhive plugin from the website. We will continue to monitor the trends of the coin miners and update accordingly.

General Recommendations

Netskope recommends the following to combat cloud malware and threats:

  • Detect and remediate cloud threats using a threat-aware CASB solution like Netskope and enforce policy on usage of unsanctioned services as well as unsanctioned instances of sanctioned cloud services
  • Sample policies to enforce:
    • Scan all uploads from unmanaged devices to sanctioned cloud applications for malware
    • Scan all uploads from remote devices to sanctioned cloud applications for malware
    • Scan all downloads from unsanctioned cloud applications for malware
    • Scan all downloads from unsanctioned instances of sanctioned cloud applications for malware
    • Enforce quarantine/block actions on malware detection to reduce user impact
    • Block unsanctioned instances of sanctioned/well known cloud apps, to prevent attackers from exploiting user trust in cloud. While this seems a little restrictive, it significantly reduces the risk of malware infiltration attempts via cloud
  • Enforce DLP policies to control files and data en route to or from your corporate environment
  • Regularly back up and turn on versioning for critical content in cloud services
  • Enable the “View known file extensions” option on Windows machines
  • Warn users to avoid executing unsigned macros and macros from an untrusted source, unless they are very sure that they are benign
  • Administrators can create firewall rules to block bitcoin pools documented in the Wikipedia article
  • Warn users to avoid executing any file unless they are very sure that they are benign
  • Warn users against opening untrusted attachments, regardless of their extensions or filenames
  • Keep systems and antivirus updated with the latest releases and patches
author image
Ashwin Vamshi
Ashwin Vamshi is a Security Researcher with innate interest in targeted attacks and malwares using cloud services. He is primarily focusing in identifying new attack vectors and malwares, campaigns and threat actors using ‘cloud as an attack vector.’

Stay informed!

Subscribe for the latest from the Netskope Blog