Adversaries may leverage the SharePoint repository as a source to mine valuable information. SharePoint will often contain useful information for an adversary to learn about the structure and functionality of the internal network and systems. For example, the following is a list of example information that may hold potential value to an adversary and may also be found on SharePoint:
Consider periodic review of accounts and privileges for critical and sensitive SharePoint repositories.
|User Account Management
Enforce the principle of least-privilege. Consider implementing access control mechanisms that include both authentication and authorization.
Develop and publish policies that define acceptable information to be stored in SharePoint repositories.
|Application Log Content
Monitor for third-party application logging, messaging, and/or other artifacts that may leverage the SharePoint repository as a source to mine valuable information. Monitor access to Microsoft SharePoint repositories performed by privileged users (for example, Active Directory Domain, Enterprise, or Schema Administrators) should be closely monitored and alerted upon, as these types of accounts should generally not be used to access information repositories. If the capability exists, it may be of value to monitor and alert on users that are retrieving and viewing a large number of documents and pages; this behavior may be indicative of programmatic means being used to retrieve all data within the repository. In environments with high-maturity, it may be possible to leverage User-Behavioral Analytics (UBA) platforms to detect and alert on user based anomalies.
|Logon Session Creation
Monitor for newly constructed logon behavior across Microsoft's SharePoint which can be configured to report access to certain pages and documents.  As information repositories generally have a considerably large user base, detection of malicious use can be non-trivial.