Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Vulnerabilities / Threats

End of Bibblio RCM includes -->
6/7/2021
06:20 PM
Connect Directly
Twitter
LinkedIn
RSS
E-Mail

First Known Malware Surfaces Targeting Windows Containers

Siloscape is designed to create a backdoor in Kubernetes clusters to run malicious containers.

Organizations running Windows containers in their Kubernetes cluster have a brand-new threat to worry about.

Researchers from Palo Alto Networks (PAN) have discovered what they say is the first known malware targeting Windows containers. The malware, named Siloscape, is designed to escape from a Windows container into the Kubernetes node so it can spread in the cluster.

Related Content:

Malicious or Vulnerable Docker Images Widespread, Firm Says

Special Report: Assessing Cybersecurity Risk in Today's Enterprises

New From The Edge: How Can I Test the Security of My Home-Office Employees' Routers?

Attackers can use the malware to carry out a variety of malicious actions, such as credential and data theft, deploying ransomware, and breaching enterprise software development and testing environments.

Daniel Prizmant, senior staff researcher at PAN's Unit 42 threat intelligence team, says the malware is a manifestation of the growing attacker focus on cloud environments. "Attackers are undergoing their own digital transformation and exploiting the massive enterprise shift to the cloud and new technologies like containers," he says. "As a result, container security has become important."

Prizmant describes Siloscape as heavily obfuscated malware whose main purpose is to open a backdoor into poorly configured Kubernetes clusters to run malicious containers. It does this by first targeting known vulnerabilities in common cloud applications, such as Web servers, to gain initial access to a Windows container. It then uses Windows container escape techniques to break free from the container and gain code execution access to the underlying node. According to PAN, there are several methods for escaping Windows containers. Siloscape uses a technique called thread impersonation that has little documentation and even fewer working examples, the security vendor says in its report.

The malware verifies if the compromised node has the privileges needed to create new Kubernetes deployments. Siloscape then connects to a command-and-control server over the Tor network and executes the commands it receives. Unlike other malware, Siloscape contains no functionality for harming the Kubernetes cluster itself. Rather its main function is to open a backdoor quietly and untraceably on the cluster that attackers can then use for different malicious purposes, according to PAN's report.

"Because Siloscape opens a backdoor to the Kubernetes cluster, it gives the attacker the access to run any code, anywhere on the victim's cluster," Prizmant says. "For example, an attacker could use the computing power for cryptojacking, or they could use it as part of a botnet that could be used for future DDoS attacks."

Similarly, attackers could use the backdoor to install malware for stealing internal data of the victim, including code, container images, and databases. Attackers could also leverage the access to create a ransomware attack by locking and encrypting the cluster, or they could modify the cluster to attack other victims. "If the cluster runs a Web server, the attacker could modify it and attack all its users by changing the server’s code," Prizmant says.

PAN says its investigation of the C2 server showed at least 23 active Siloscape victims. The analysis also showed that the C2 server was being used to host over 300 users in total. The data suggests that Siloscape is only part of a broader campaign targeting enterprise cloud environments and that the campaign has been going on for more than a year, the security vendor says.

Prizmant says organizations that use Windows containers to run online applications, such as Web servers, are most at risk. He says a well-configured Kubernetes cluster that's secure will make life much harder for Siloscape. That's because even if the malware manages to escape the container, it wouldn't be able to take control of the cluster.

He recommends that organizations running Windows containers should limit the privilege of each node using Kubernetes Authorization modules such as role-based access control. Prizmant adds that users should also not run anything in a Windows container that they wouldn't be willing run as an administrator on the host system.

Jai Vijayan is a seasoned technology reporter with over 20 years of experience in IT trade journalism. He was most recently a Senior Editor at Computerworld, where he covered information security and data privacy issues for the publication. Over the course of his 20-year ... View Full Bio

Comment  | 
Print  | 
More Insights
//Comments
Newest First  |  Oldest First  |  Threaded View
Edge-DRsplash-10-edge-articles
I Smell a RAT! New Cybersecurity Threats for the Crypto Industry
David Trepp, Partner, IT Assurance with accounting and advisory firm BPM LLP,  7/9/2021
News
Attacks on Kaseya Servers Led to Ransomware in Less Than 2 Hours
Robert Lemos, Contributing Writer,  7/7/2021
Commentary
It's in the Game (but It Shouldn't Be)
Tal Memran, Cybersecurity Expert, CYE,  7/9/2021
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
Creating an Effective Incident Response Plan
Security teams are realizing their organizations will experience a cyber incident at some point. An effective incident response plan that takes into account their specific requirements and has been tested is critical. This issue of Tech Insights also includes: -a look at the newly signed cyber-incident law, -how organizations can apply behavioral psychology to incident response, -and an overview of the Open Cybersecurity Schema Framework.
Flash Poll
How Enterprises are Developing Secure Applications
How Enterprises are Developing Secure Applications
Recent breaches of third-party apps are driving many organizations to think harder about the security of their off-the-shelf software as they continue to move left in secure software development practices.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2022-43705
PUBLISHED: 2022-11-27
In Botan before 2.19.3, it is possible to forge OCSP responses due to a certificate verification error. This issue was introduced in Botan 1.11.34 (November 2016).
CVE-2022-45934
PUBLISHED: 2022-11-27
An issue was discovered in the Linux kernel through 6.0.10. l2cap_config_req in net/bluetooth/l2cap_core.c has an integer wraparound via L2CAP_CONF_REQ packets.
CVE-2022-45931
PUBLISHED: 2022-11-27
A SQL injection issue was discovered in AAA in OpenDaylight (ODL) before 0.16.5. The aaa-idm-store-h2/src/main/java/org/opendaylight/aaa/datastore/h2/UserStore.java deleteUser function is affected when the API interface /auth/v1/users/ is used.
CVE-2022-45932
PUBLISHED: 2022-11-27
A SQL injection issue was discovered in AAA in OpenDaylight (ODL) before 0.16.5. The aaa-idm-store-h2/src/main/java/org/opendaylight/aaa/datastore/h2/RoleStore.java deleteRole function is affected when the API interface /auth/v1/roles/ is used.
CVE-2022-45933
PUBLISHED: 2022-11-27
KubeView through 0.1.31 allows attackers to obtain control of a Kubernetes cluster because api/scrape/kube-system does not require authentication, and retrieves certificate files that can be used for authentication as kube-admin. NOTE: the vendor's position is that KubeView was a "fun side proj...