![]() ![]() The default log sizes are acceptable in environments where local storage is limited (e.g. The Application and System log sizes should also be increased, but typically these do not contain as much data and hence do not need to be as large as the Security log. To reduce this risk, the Security log size needs to be increased from its default size of 20 MB. This introduces risk as important events could be quickly overwritten. The Windows default settings have log sizes set to a relatively small size and will overwrite events as the log reaches its maximum size. Organisations are recommended to use this tool in their Windows environment. System Monitor (Sysmon), a tool published by Microsoft, provides greater visibility of system activity on a Windows host than standard Windows logging. Care should be taken to ensure that existing legacy audit policies are migrated to advanced audit policies. The recommended Group Policy settings in this publication use advanced audit policies which may override existing legacy audit policies. Testing should focus on the volume of logging generated and any impact on the network’s performance, particularly where information may be transmitted across low bandwidth connections. To assist with the management of recommendations in this publication, the Group Policy settings discussed should be placed in a separate Group Policy Object (GPO) with the scope set for all Windows hosts on the domain.Īll changes made to systems should be fully tested to ensure there are no unintended side effects to an organisation’s normal business processes. Windows hosts and network equipment) are configured to use an accurate time source.Īs detailed in the Strategies to Mitigate Cyber Security Incidents, the recommended event log retention time is at least 18 months however, some organisations may have a regulatory requirement to retain event logs for a longer period. ![]() Organisations are recommended to ensure all devices in their environment (e.g. To enable accurate correlation of events, accurate and consistent time stamps must be used. Some Group Policy settings used in this publication may not be available or compatible with Professional, Home or S editions of Windows. This publication’s recommendations require the use of Microsoft Windows Server 2008 R2 and Microsoft Windows 7 SP1, or newer versions. All files and folders referred to in this publication are available from this repository. The repository contains configuration files and scripts to implement the recommendations in this publication. This publication does not contain detailed information about analysing event logs.Īccompanying this publication is the ACSC’s Windows Event Logging Repository. It covers the types of events which can be generated and an assessment of their relative value, centralised collection of event logs, the retention of event logs, and recommended Group Policy settings along with implementation notes. This publication is intended for information technology and information security professionals. This advice is also designed to complement existing host-based intrusion detection and prevention systems. This advice has been developed to support both the detection and investigation of malicious activity by providing an ideal balance between the collection of important events and management of data volumes. This publication has been developed as a guide to the setup and configuration of Windows event logging and forwarding. ![]() ![]() It also aids incident response efforts by providing critical insights into the events relating to a cyber security incident and reduces the overall cost of responding to them. Good visibility of what is happening in an organisation’s environment is essential for conducting an effective investigation. A common theme identified by the Australian Cyber Security Centre (ACSC) while performing investigations is that organisations have insufficient visibility of activity occurring on their workstations and servers. ![]()
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