Even MOAR Powershell, looking at Entra logins - the good, the bad and the password sprays, (Fri, Aug 21st)

The content provides a practical approach to analyzing Microsoft Entra (Azure AD) login logs using PowerShell and Microsoft Graph API. It demonstrates how to extract and filter audit log sign-in data to identify failed login attempts, including password spray attacks, by examining failure reasons and geo-location information. It also shows how to detect successful logins from unexpected countries to spot potential unauthorized access. The report includes example commands for filtering and presenting this data, aiming to help administrators improve their conditional access policies and overall cloud security posture.

The impact centers on the risk of unauthorized access through password spray attacks and potentially compromised accounts in cloud environments if login logs are not regularly monitored. Failure to analyze these logs can allow attackers to persist undetected, leading to account lockouts or breaches. By identifying suspicious login patterns, organizations can mitigate risks by adjusting conditional access policies and improving detection capabilities.

This report does not describe a vulnerability requiring a patch but recommends proactive log monitoring and analysis using the provided PowerShell commands. Organizations should regularly review Entra login logs for failed and successful sign-ins, focusing on geo-location anomalies and failure reasons. Based on findings, tightening conditional access policies is advised to reduce the risk of unauthorized access. No specific patch or fix is applicable.