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Evolving techniques targeting cloud native environments uncovered

By Shannon Williams
Fri 22 Apr 2022

Attackers are finding new ways to target cloud native environments, new research from Aqua Security has revealed.

The research shows that adversaries are adopting more sophisticated techniques, leveraging multiple attack components and shifting attention to Kubernetes and the software supply chain. The ‘2022 Cloud Native Threat Report: Tracking Software Supply Chain and Kubernetes Attacks and Techniques’ provides insight on trends and key takeaways for practitioners about the cloud native threat landscape.

Research revealed that adversaries are engaging with new tactics, techniques and procedures (TTPs) to specifically target cloud native environments. While cryptominers were the most common malware observed, with increasing frequency, Team Nautilus discovered an increased usage of backdoors, rootkits and credential stealers — signs that intruders have more than cryptomining in their plans.

Backdoors, which permit a threat actor to access a system remotely and are used to establish persistence in the compromised environment, were encountered in 54% of attacks (up 9% compared with 2020). Additionally, half of the malicious container images (51%) analysed by researchers contained worms, which allow attackers to increase the scope of their attack with minimal effort (up 10% compared with 2020).

Notably, threat actors also broadened their targets to include CI/CD and Kubernetes environments. In 2021, 19% of the malicious container images analysed targeted Kubernetes, including kubelets and API servers, up 9% compared with the previous year.

“These findings underscore the reality that cloud native environments now represent a target for attackers, and that the techniques are always evolving,” says Assaf Morag, Threat Intelligence and Data Analyst Lead, Aqua’s Team Nautilus.

 “The broad attack surface of a Kubernetes cluster is attractive for threat actors, and then once they are in, they are looking for low-hanging fruit.”

Other key findings from the report include:

  • The proportion and variety of observed attacks targeting Kubernetes has increased, and this includes a wider adoption of the weaponisation of Kubernetes UI tools.
  • Supply chain attacks represent 14.3% of the particular sample of images from public image libraries, showing that these attacks continue to be an effective method of attacking cloud native environments.
  • The Log4j zero-day vulnerability was immediately exploited in the wild. Team Nautilus detected multiple malicious techniques, including known malware, fileless execution, reverse shell executions and files that were downloaded and executed from memory — all emphasising the need for runtime protection.
  •  Researchers observed honeypot attacks by TeamTNT after the group announced its retirement in December 2021. However, no new tactics have been in use, so it is unclear if the group is still in operation or if the ongoing attacks originated from automated attack infrastructure. Regardless, enterprise teams should continue preventative measures against these threats. 

 
Aqua’s Team Nautilus made extensive use of honeypots to investigate attacks in the wild, and to investigate supply chain attacks against cloud native applications, the team examined images and packages from public registries and repositories, such as DockerHub, NPM and Python Package Index.

Team Nautilus utilised Aqua’s Dynamic Threat Analysis (DTA) product to analyse each attack. Aqua DTA is the industry’s first container sandbox solution that dynamically assesses container image behaviours to determine whether they harbour hidden malware. This enables organisations to identify and mitigate attacks that static malware scanners cannot detect.

“The key takeaway from this report is that attackers are highly active — more than ever before — and more frequently targeting vulnerabilities in applications, open source and cloud technology,” says Morag. 

“Security practitioners, developers and devops teams must seek out security solutions that are purpose-built for cloud native. Implementing proactive and preventative security measures will allow for stronger security and ultimately protect environments.”

To ensure cloud environments are secure, Aqua’s Team Nautilus recommends implementing runtime security measures, a layered approach to Kubernetes security and scanning in development.

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