Adversaries may purchase and configure serverless cloud infrastructure, such as Cloudflare Workers, AWS Lambda functions, or Google Apps Scripts, that can be used during targeting. By utilizing serverless infrastructure, adversaries can make it more difficult to attribute infrastructure used during operations back to them.

Once acquired, the serverless runtime environment can be leveraged to either respond directly to infected machines or to Proxy traffic to an adversary-owned command and control server.^[1],[2],[3] As traffic generated by these functions will appear to come from subdomains of common cloud providers, it may be difficult to distinguish from ordinary traffic to these providers - making it easier to Hide Infrastructure.^[4],[1]

References

1. Lawrence Abrams. (2020, March 14). BlackWater Malware Abuses Cloudflare Workers for C2 Communication. Retrieved July 8, 2022.
2. Adam Chester. (2020, February 25). AWS Lambda Redirector. Retrieved July 8, 2022.
3. Sergiu Gatlan. (2021, February 18). Hackers abuse Google Apps Script to steal credit cards, bypass CSP. Retrieved July 1, 2024.
4. Gary Golomb. (n.d.). Threat Hunting Series: Detecting Command & Control in the Cloud. Retrieved July 8, 2022.

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