Pierluigi Paganini December 29, 2020

Cybersecurity and Infrastructure Security Agency (CISA) released a tool for detecting potentially malicious activities in Azure/Microsoft 365 environments.

The Cybersecurity and Infrastructure Security Agency (CISA)’s Cloud Forensics team has released a PowerShell-based tool, dubbed Sparrow, that can that helps administrators to detect anomalies and potentially malicious activities in Azure/Microsoft 365 environments.

The tool was developed to support incident responders and investigate identity and authentication-based attacks.

“CISA has created a free tool for detecting unusual and potentially malicious activity that threatens users and applications in an Azure/Microsoft O365 environment.” reads the post published by CISA. “The tool is intended for use by incident responders and is narrowly focused on activity that is endemic to the recent identity- and authentication-based attacks seen in multiple sectors.”

CISA recommends users and administrators to visit this GitHub page for additional information and detection countermeasures.

The Sparrow.ps1 script checks and installs the required PowerShell modules on the analysis machine, then check the unified audit log in MSAzure/M365 for certain indicators of compromise (IoC’s), list Azure AD domains, and check Azure service principals and their Microsoft Graph API permissions to identify potential malicious activity.

The tool provides in output the data into multiple CSV files placed in a default directory.

A few days ago, CrowdStrike released a free Azure security tool after it was notified by Microsoft of a failed attack leveraging compromised credentials. CrowdStrike experts decided to create their own tool because they face difficulties in using Azure’s administrative tools to enumerate privileges assigned to third-party resellers and partners in their tenant.

The CrowdStrike Reporting Tool for Azure (CRT) tool could be used by administrators to analyze their Microsoft Azure environment and review the privileges assigned to third-party resellers and partners.

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Pierluigi Paganini

(SecurityAffairs – hacking, CISA)

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