T1583.007_serverless

T1583.007 Serverless

Sub-technique of: T1583

High-Level Description

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. 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.

Kill Chain Phase

• Resource Development (TA0042)

Platforms: PRE

What to Check

• Identify if Serverless technique is applicable to target environment
• Check PRE systems for indicators of Serverless
• Verify mitigations are bypassed or absent (1 known mitigations)
• Assess detection coverage (1 detection strategies)

How to Test

Manual Testing

1. Identify Attack Surface: Determine if the target environment is susceptible to Serverless by examining the target platforms (PRE).

2. Assess Existing Defenses: Review whether mitigations for T1583.007 are in place. If defenses are absent or misconfigured, this technique may be exploitable.

3. Execute Test: Use tools and methods described in the MITRE ATT&CK page and external references below.

Note: No Atomic Red Team tests available for this technique. See Atomic Red Team GitHub for updates.

Remediation Guide

M1056 Pre-compromise

This technique cannot be easily mitigated with preventive controls since it is based on behaviors performed outside of the scope of enterprise defenses and controls.

Detection

Detection of Serverless

Risk Assessment

CWE Categories

References

• AWS Lambda Redirector
• Detecting Command & Control in the Cloud
• BlackWater Malware Cloudflare Workers
• GWS Apps Script Abuse 2021
• Atomic Red Team - T1583.007
• MITRE ATT&CK - T1583.007