Suspicious Login Issues

How to Review a SharePoint Sign-In from a Malicious IP Address

WPS Editor Sep 27, 2026 869 views

Question details

The user needs to properly review and seek guidance on a successful SharePoint sign-in event originating from an IP address flagged as malicious.

How to Review a SharePoint Sign-In from a Malicious IP Address

Product: Microsoft SharePoint
Device & OS: not provided
Scenario: Evaluating and addressing a security alert where an unauthorized or malicious IP successfully signed into a SharePoint environment.
Observed behavior: A successful sign-in event from a malicious IP was recorded, requiring review in the appropriate security or event-management context.

Before you start

Before sharing any security event logs on support forums, ensure you have completely redacted all passwords, personal identifiable information (PII), and sensitive tenant details.

Solution 1Recommended

Seek Assistance in the Official SharePoint Forums

Because SharePoint handles its own security logs and event providers, specialized administrative issues should be directed to dedicated Microsoft support channels.

Complex security events, such as evaluating malicious IP sign-ins, often require context-specific administrative knowledge. Posting in the appropriate specialized forum ensures you reach experts familiar with SharePoint's infrastructure.

Identify your SharePoint environment

Determine whether your organization uses SharePoint for Business or SharePoint for Education, as each version has a dedicated support community.

Sanitize your event data

Gather the relevant sign-in event logs but strictly remove passwords, usernames, internal IP addresses, and sensitive security details.

Post your query

Navigate to the appropriate Microsoft SharePoint support forum, create a new thread, and provide the sanitized context of the malicious IP sign-in for expert review.

Seek Assistance in the Official SharePoint Forums

Data Privacy: Never post raw, unedited security logs on public message boards to prevent exposing your network to further vulnerabilities.

Solution 2

Review Sign-In Logs via Microsoft Entra ID

Administrators can manually review detailed sign-in logs to evaluate the risk and block malicious IP addresses directly.

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Frequently Asked Questions

How do I know if an IP address accessing SharePoint is malicious?

Security systems like Microsoft Defender or third-party threat intelligence tools automatically flag IPs based on known malicious activities, such as brute-force attacks, malware distribution, or anonymous proxy usage.

Can I block a specific IP address from accessing my SharePoint site?

Yes, Microsoft 365 administrators can use Microsoft Entra ID Conditional Access policies to block access from specific IP addresses, ranges, or entire geographic regions.

What information should I hide before posting a security log online?

Always redact sensitive information including usernames, email addresses, passwords, session tokens, tenant IDs, domain names, and internal network architecture details.

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