Join us at Netskope’s SASE Summit, coming to a city near you! Register now.

  • Security Service Edge Products

    Protect against advanced and cloud-enabled threats and safeguard data across all vectors.

  • Borderless SD-WAN

    Confidently provide secure, high-performance access to every remote user, device, site, and cloud.

  • Platform

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

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
Borderless SD-WAN: Ushering in the New Era of Borderless Enterprise

Netskope Borderless SD-WAN offers an architecture that converges zero trust principles and assured application performance to provide unprecedented secure, high-performance connectivity for every site, cloud, remote user, and IoT device.

Read the article
Borderless SD-WAN
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 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 enables a safe, cloud-smart, and fast journey to adopt cloud services, apps, and public cloud infrastructure.

Learn about Industry Solutions
Wind turbines along cliffside
  • Our Customers

    Netskope serves more than 2,000 customers worldwide including more than 25 of the Fortune 100

  • Customer Solutions

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

  • Training and Certification

    Netskope training will help you become a cloud security expert.

We help our customers to be Ready for Anything

See our Customers
Woman smiling with glasses looking out window
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
  • 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 2: The Magic Quadrant for SSE and Getting SASE Right
Mike and Steve discuss the Gartner® Magic Quadrant™ for Security Service Edge (SSE), Netskope’s positioning, and how the current economic climate will impact the SASE journey.

Play the podcast
Bonus Episode 2: The Magic Quadrant for SSE and Getting SASE Right
Latest Blogs

How Netskope can enable the Zero Trust and SASE journey through security service edge (SSE) capabilities.

Read the blog
Sunrise and cloudy sky
Netskope AWS Immersion Day World Tour 2023

Netskope has developed a variety of hands-on labs, workshops, in-depth webinars and demos to educate and assist AWS customers in the usage and deployment of Netskope products.

Learn about AWS Immersion Day
AWS Partner
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

    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.

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
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.
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 about Netskope Partners
Group of diverse young professionals smiling

Spider: A New Thread in the Ransomware Web

Dec 11 2017
Tags
Cloud Threats
Netskope Threat Research Labs
Ransomware

Netskope Threat Research Labs has detected new ransomware named Spider propagating in a mid-scale campaign. This ongoing campaign, identified on the 10th December,  uses decoy Office documents which usually arrive as email attachments. These attachments are auto-synced to the enterprise cloud storage and collaborations apps. Netskope Threat Protection detects the decoy document as “VB:Trojan.VBA.Agent.QP” and the downloaded payload as “Trojan.GenericKD.12668779” and “Trojan.GenericKD.6290916”.

Attack Topology

The campaign’s attack vector begins with an Office document written in the Bosnian language which in all probability indicates that the threat actor is targeting or interested in the Bosnia and Herzegovina region. The decoy document we observed is shown in Figure 1.

Figure 1: Decoy Office Word document sent in the Spider Campaign.

The decoy Office document contains an obfuscated macro code, which launches the PowerShell to download the malicious payload as shown in Figure 2.

Figure 2: PowerShell downloading payloads from yourjavascript.com  

The payloads are Base64 encoded and hosted on the website – ‘yourjavascript.com,’ which is a free JavaScript hosting website.

Analysis of the payloads

After downloading the payloads, the PowerShell script decodes the Base64 string and performs XOR operation with the key ‘AlberTI’ to decode the final payloads, which is later saved into executable (.exe) files. The decoded payloads named ‘dec.exe’ and ‘enc.exe’ compiled in .NET  are copied to the ‘%APPDATA% /Spider’ directory.  

Spider ransomware

The file ‘enc.exe’ is the ransomware encryptor, while ‘dec.exe’ works as the Decryptor.Dec.exe displays the user interface for warning message and to decrypt the files using a decryption key. Spider ransomware also copies two text files ‘files.txt’ and ‘id.txt’ respectively inside the ‘%APPDATA% /Spider’ directory along with the executables as shown in Figure 3.

Figure 3: Spider ransomware dropped files

PowerShell launches the ransomware decryptor, dec.exe with ‘spider’ argument and enc.exe file with ‘spider ktn 100’ arguments. Spider ransomware decryptor monitors the system processes and prevents opening of windows utility tools like taskmgr, procexp, msconfig, regedit, cmd, outlook, winword, excel, and msaccess as shown in Figure 4.

Figure 4: Spider ransomware anti-analysis tools checks

The payload ‘enc.exe’ then encrypts the user’s files and adds the ‘.spider’ extension as shown in Figure 5.

Figure 5: Spider ransomware encrypted  files with .spider extension

Spider ransomware also maintains the list of files that it has encrypted in the ‘files.txt’ file under the Spider folder as shown in Figure 6.

Figure 6: List of files that Spider ransomware has encrypted

Spider ransomware also copies a signature file ‘5p1d3r’ to the Spider folder. The content of the file is K.T.N Cr3w, which is most likely attributed to the creators of Spider ransomware as shown in Figure 7.

Figure 7:  Spider ransomware signature file

Once Spider ransomware encrypts the files, a warning message is displayed. The warning message also provides language translation into its user interface as shown in Figure 8.

Figure 8: Warning message with language translation interface of Spider ransomware

The warning message provides a descriptive message on how to decrypt files as shown in Figure 9.

Figure 9: Decrypt file message of Spider ransomware.

It also provides a help section which contains the links and references to the resources needed to make the payment to the attacker as shown in Figure 10.

Figure 10: Help resources and ID required to get the decryption key of Spider ransomware

The interface for decrypting files once the decryption key is obtained is shown in Figure 11.

Figure 11: Decrypt files interface of Spider ransomware

Further research uncovered a video uploaded on vid.me as shown in Figure 12.

Figure 12. Video guide of Spider ransomware posted at https://vid[.]me/CGyDc

The video provides instructions to decrypt victims files. We suspect that the video was most likely uploaded by the threat actor group of Spider. Please note that the service vid.me itself will cease to exist on the 15th December.

Conclusion

Ransomware continues to evolve and prevail as a top threat to all verticals in many organizations. The addition of Spider ransomware as a new cob in the increasing ransomware web is a classic example. We continue to see an increase of decoy Office documents as an attack vector in spreading ransomware like GlobeImposter tied to several active and ongoing campaigns. As ransomware continues to evolve, administrators should educate employees about the impact of ransomware and ensure the protection of the organization’s data by making a regular backup of critical data. In addition to disabling macros by default, users must also be cautious of documents that only contain a message to enable macros to view the contents and also not to execute unsigned macros and macros from untrusted sources. Netskope Threat Research Labs will continue to monitor ransomware campaigns and provide updates as the campaign evolves.

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 deploy policies on usage of unsanctioned services as well as unsanctioned instances of sanctioned cloud services. Sample policies are as follows:
    • 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 un-approved instances of sanctioned or well-known cloud apps, to prevent attackers from exploiting user trust in the 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 any file unless they are very sure that they are benign
  • Warn users against opening untrusted attachments, regardless of their extensions or filenames
  • Warn users to avoid executing unsigned macros and macros from an untrusted source, unless they are very sure that they are benign
  • Enterprise users should always keep their systems and Antivirus updated with the latest releases and patches.