AWS Lambda infrastructure enumeration activity

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	1 Hour
Deduplication Period	5 Days
Required Data	AWS Audit Log
Detection Modules	Cloud
ATT&CK Tactic	Discovery (TA0007)
ATT&CK Technique	Cloud Infrastructure Discovery (T1580)
Severity	Informational

Description

Lambda infrastructure enumeration activity detected within a specific AWS region.

Attacker's Goals

• Discover deployed functions and their configurations.
• Assess IAM policies, event triggers, and execution limits to evaluate privilege levels and potential abuse paths.
• Enumerate metadata for potential weaknesses or sensitive data.

Investigative actions

• Identify and review the specific Lambda enumeration API calls executed and their frequency.
• Verify the identity performing the calls and assess if this behavior is typical or anomalous.
• Correlate with other discovery activities and check related logs for suspicious patterns or subsequent actions.