Azure storage account blob anonymous access is enabled

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	N/A (single event)
Deduplication Period	5 Days
Required Data	Azure Audit Log
Detection Modules	Cloud
Detector Tags	Cloud Data Asset Exfiltration, Cloud Data Asset Public Exposure, Data Detection & Response
ATT&CK Tactic	Privilege Escalation (TA0004), Initial Access (TA0001)
ATT&CK Technique	Valid Accounts: Cloud Accounts (T1078.004)
Severity	Informational

Description

It is possible to configure anonymous access to blobs within the storage account.

Attacker's Goals

• The attacker wants to maintain indirect control over the resource.
• Attackers intend 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 blobs within the storage account should be accessed from all networks.
• Disable public network access or disable blob anonymous access to storage account if needed.
• Check if the identity performed additional malicious activity and restrict permissions for the identity if required.