AWS Lambda Cross-Account sensitive permissions configured

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	N/A (single event)
Deduplication Period	5 Days
Required Data	AWS Audit Log
Detection Modules	Cloud
ATT&CK Tactic	Persistence (TA0003)
ATT&CK Technique	Account Manipulation: Additional Cloud Roles (T1098.003), Account Manipulation (T1098)
Severity	Low

Description

A cloud identity has granted external AWS account sensitive permissions to a Lambda function.

Attacker's Goals

Obtaining persistency by using a Lambda function in the target's environment as a backdoor.

Investigative actions

• Investigate any unusual activity originating from the suspected identity.
• Investigate any unusual Lambda functions related operations originating from the allowed added accounts.
• Validate the legitimacy of the AWS accounts that were allowed external access.

Variations

AWS Lambda public sensitive permissions configured

Synopsis

Field	Value
ATT&CK Tactic	Persistence (TA0003)
ATT&CK Technique	Account Manipulation: Additional Cloud Roles (T1098.003), Account Manipulation (T1098)
Severity	Medium

Description

A cloud identity has granted public sensitive permissions to a Lambda function.

Attacker's Goals

Obtaining persistency by using a Lambda function in the target's environment as a backdoor.

Investigative actions

• Investigate any unusual activity originating from the suspected identity.
• Investigate any unusual Lambda functions related operations originating from the allowed added accounts.
• Validate the legitimacy of the AWS accounts that were allowed external access.

AWS Lambda public permissions configured

Synopsis

Field	Value
ATT&CK Tactic	Persistence (TA0003)
ATT&CK Technique	Account Manipulation: Additional Cloud Roles (T1098.003), Account Manipulation (T1098)
Severity	Low

Description

A cloud identity has granted public permissions to a Lambda function.

Attacker's Goals

Obtaining persistency by using a Lambda function in the target's environment as a backdoor.

Investigative actions

• Investigate any unusual activity originating from the suspected identity.
• Investigate any unusual Lambda functions related operations originating from the allowed added accounts.
• Validate the legitimacy of the AWS accounts that were allowed external access.

AWS Lambda Cross-Account permissions configured

Synopsis

Field	Value
ATT&CK Tactic	Persistence (TA0003)
ATT&CK Technique	Account Manipulation: Additional Cloud Roles (T1098.003), Account Manipulation (T1098)
Severity	Informational

Description

A cloud identity has granted an external AWS account permissions to a Lambda function.

Attacker's Goals

Obtaining persistency by using a Lambda function in the target's environment as a backdoor.

Investigative actions

• Investigate any unusual activity originating from the suspected identity.
• Investigate any unusual Lambda functions related operations originating from the allowed added accounts.
• Validate the legitimacy of the AWS accounts that were allowed external access.