AWS S3 bucket was exposed to public access

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	N/A (single event)
Deduplication Period	1 Day
Required Data	AWS Audit Log
Detection Modules	Cloud
Detector Tags	Cloud Data Asset Exfiltration, Cloud Data Asset Public Exposure, Data Detection & Response
ATT&CK Tactic	Defense Impairment (TA0112)
ATT&CK Technique	Disable or Modify Tools (T1685)
Severity	Low

Description

AWS S3 bucket was publicly shared.

Attacker's Goals

• The attacker wants to maintain indirect control over the resource.
• The attacker intends to allow public access, making it harder to detect future activity.
• Attackers are constantly monitoring for public assets to steal sensitive information.

Investigative actions

• Check if the identity intended to change the state of the bucket or object to public.
• Review the bucket ACL policy.
• Restrict permissions for the identity if needed.

Variations

AWS S3 bucket was exposed to public access by admin cloud identity

Synopsis

Field	Value
ATT&CK Tactic	Defense Impairment (TA0112)
ATT&CK Technique	Disable or Modify Tools (T1685)
Severity	Informational

Description

AWS S3 bucket was publicly shared.

Attacker's Goals

• The attacker wants to maintain indirect control over the resource.
• The attacker intends to allow public access, making it harder to detect future activity.
• Attackers are constantly monitoring for public assets to steal sensitive information.

Investigative actions

• Check if the identity intended to change the state of the bucket or object to public.
• Review the bucket ACL policy.
• Restrict permissions for the identity if needed.

AWS S3 bucket was exposed to public access containing sensitive information

Synopsis

Field	Value
ATT&CK Tactic	Defense Impairment (TA0112)
ATT&CK Technique	Disable or Modify Tools (T1685)
Severity	High

Description

AWS S3 bucket was publicly shared.

Attacker's Goals

• The attacker wants to maintain indirect control over the resource.
• The attacker intends to allow public access, making it harder to detect future activity.
• Attackers are constantly monitoring for public assets to steal sensitive information.

Investigative actions

• Check if the identity intended to change the state of the bucket or object to public.
• Review the bucket ACL policy.
• Restrict permissions for the identity if needed.