In the previous post we walked through on how to setup an ELK instance and forward event logs using Winlogbeat. We will be making specific configuration changes for Winlogbeat for forwarding events.
In this post, we will be working through:. Disclaimer: Prior to beginning, you should already be familiar with creating and configuring Group Policy Objects. It is also recommended that you work through the instructions referenced in a lab environment. Environment Much like my lab environment described in the previous post, I am running Hyper-V with two Windows 10 hosts, two Windows Servers, and an Ubuntu Server I setup the Windows hosts into a small Windows Domain.
I have tested the same setup with VMware Workstation and things worked just fine. I highly recommend watching the video as it will provide additional context for event forwarding. Surprisingly enough that is ALL that is needed to setup a Windows log collector.
This can be done by issuing the following command from an elevated command prompt to allow the log to grow to 1 GB. In a future blog post we might get into specifics about log event size and setting up custom log event buckets, but that will be outside the scope of this post.
You can deep dive into this topic here:. Winlogbeat will be used to forward collected events to the ELK instance. Download a copy of Winlogbeat and place the unzipped folder on the Desktop.
Now edit the winlogbeat. The following snippets will show you what to edit. The following command can be used, but you will replace the relevant areas with the correct usernames and IP address. From an administrator PowerShell prompt, navigate to the Winlogbeat folder on your desktop and issue the following commands:.
Now that the service is running, all events that are sent to the Forwarded Events Log will be sent to the ELK instance.
Sysmon Threat Analysis Guide
First, we need to setup some GPOs and setup subscriptions to tell hosts in the domain what events we want for them to send. Setting up group policies is critical for our event forwarding to work correctly. The GPO we are about to setup will tell hosts in the domain where to send logs, allow the Network Service to access log data, and configure WINRM to ship off the data and run on startup.
In the new window that will pop up, enter the FQDN for the collector. We will also specify the time interval we want hosts to check in with the collector for subscription information. The refresh interval is in seconds, so this line will require hosts to check in every two minutes.
Apply your changes to save the configuration changes you have just made. The next configuration that we will make to this GPO is to give the Network Service user the ability to read event logs.
This prevents us from having to use wevtutil to edit permissions on the log file to allow WINRM to read and send log data to the collector. Right-click within the window and select Add Group.
A new window will pop open, click on Browser then on Advanced and finally on Find Now. From Event Log Readers Properties click on Addand within the text box provided type or paste in the following:. Find the Windows Remote Management service, and edit it so the Policy is defined and the radial button is set at Automatic. Now we can begin linking the GPOs to the appropriate groups. If you do not have any end point management software, deploying software can become fairly tricky.
Yes, you could create a separate folder on a file share, but you need to ensure that the correct permissions are set on that folder so that no regular user can easily write to that location.
You have been warned. Rename the file to Sysmonconfig.3/12/19 - Sysmon and Splunk
Download a copy of SysmonStartup. Be careful of spaces when entering the information.Windows provides an event log collection tool, organized into channels, which includes every event generated. The main channels are System, Application and Security, where events will be stored depending on whether they were created by a system action, an active audit policy or if they have information related to software installed in the system.
Wazuh collects events from those channels and provides a new Windows ruleset which makes us aware of important events happening in our Windows servers. Monitoring Sysmon could be an interesting application for this service. It consists of a Windows tool that records system activity and anomaly detection events in the event log, and it is a subprogram from Winternalsa subdivision of Microsoft created by Mark Russinovich. In this case, the Wazuh agent will be set up to monitor the logs from the Sysmon channel, but this configuration can be extended to the rest of the available channels.
To accomplish this goal, we will view the log messages generated on the EventViewer, which permits the visualization of recorded events.
Each log entry shows all the event information through a main message which describes the origin of the event and other specific parameters considered in the event. In order to monitor the logs from Sysmon, it is necessary to configure the agent to keep track of the desired processes. Our purpose in this post is to monitor the inter-process access, the process creation and the remote thread creation of Mimikatz. This experimental threat is a command-line tool that permits the execution of different operations which may appear suspicious to Sysmon, and therefore, they will be registered in the Sysmon section in the Windows event log.Satyanarayana biochemistry pdf 5th edition
These are the installation and configuration steps:. Now that the configuration file for Sysmon has been loaded, download Mimikatz here. The first event to be matched will be the process creation event. Executing the mimikatz. In this event, two main structures are differentiated, System and EventData. The first one is composed of generic metadata, while the second one includes particular fields for each kind of event. All of those fields are gathered and processed by Wazuh, as will be explained below.
Once the Wazuh agent is installed and running in the computer being monitored, it is necessary to set up the agent to monitor Sysmon events. With this configuration, Sysmon events will be checked and retrieved by Wazuh. Once the Wazuh manager has gathered the events, it uses an internal decoder for translating them into JSON format. Going further, the creation of rules can imply a higher level of monitoring, because it involves alert triggering, which is a more visual form of keeping track of what is happening in the system.
As configured in the XML file, the events that will be monitored in this case will be events 1 process creation8 remote thread creation and 10 process access. We can use the generic Sysmon rules included in the Wazuh ruleset as parents for the custom ones created for this use case.
To generate alerts that match the rules from the previous section, two operations with Mimikatz can be executed. One of them consists of running mimikatz. The following images show the execution of these two operations and the events that were caused by them. In the next screenshot from the EventViewer, we can see one of these events in detail.
Specifically, the remote thread creation event:. The events collected by the Wazuh agent are forwarded to the manager where they are processed by the Windows decoder and evaluated against the rule engine. Here we can see alerts generated from the Wazuh App side:.Download PsTools 2. The Resource Kit comes with a utility, elogdump, that lets you dump the contents of an Event Log on the local or a remote computer. PsLogList is a clone of elogdump except that PsLogList lets you login to remote systems in situations your current set of security credentials would not permit access to the Event Log, and PsLogList retrieves message strings from the computer on which the event log you view resides.
The default behavior of PsLogList is to show the contents of the System Event Log on the local computer, with visually-friendly formatting of Event Log records. Command line options let you view logs on different computers, use a different account to view a log, or to have the output formatted in a string-search friendly way. PsLogList loads message source modules on the system where the event log being viewed resides so that it correctly displays event log messages. PsTools PsLogList is part of a growing kit of Sysinternals command-line tools that aid in the administration of local and remote systems named PsTools.
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PsLogList v2. Installation Just copy PsLogList onto your executable path, and type "psloglist". If you omit this you will be prompted to enter a hidden password. This format is convenient for text searches, e. Runs on: Client: Windows Vista and higher. Server: Windows Server and higher. Related Articles Is this page helpful? Yes No. Any additional feedback?
Skip Submit. Is this page helpful? Specifies optional password for user name.Download Sysmon 1. System Monitor Sysmon is a Windows system service and device driver that, once installed on a system, remains resident across system reboots to monitor and log system activity to the Windows event log. It provides detailed information about process creations, network connections, and changes to file creation time. By collecting the events it generates using Windows Event Collection or SIEM agents and subsequently analyzing them, you can identify malicious or anomalous activity and understand how intruders and malware operate on your network.
Note that Sysmon does not provide analysis of the events it generates, nor does it attempt to protect or hide itself from attackers. Sysinternals Sysmon v The service logs events immediately and the driver installs as a boot-start driver to capture activity from early in the boot that the service will write to the event log when it starts.
If you need more information on configuration files, use the '-? More examples are available on the Sysinternals website. Specify -accepteula to automatically accept the EULA on installation, otherwise you will be interactively prompted to accept it.
Event timestamps are in UTC standard time. The process creation event provides extended information about a newly created process. The full command line provides context on the process execution.
Using Sysmon and ETW For So Much More
The ProcessGUID field is a unique value for this process across a domain to make event correlation easier. The hash is a full hash of the file with the algorithms in the HashType field. The change file creation time event is registered when a file creation time is explicitly modified by a process.
This event helps tracking the real creation time of a file. Attackers may change the file creation time of a backdoor to make it look like it was installed with the operating system.
Note that many processes legitimately change the creation time of a file; it does not necessarily indicate malicious activity. It is disabled by default. The event also contains the source and destination host names IP addresses, port numbers and IPv6 status.
The process terminate event reports when a process terminates.ETW is a heavy area for analysis that we use when identifying indicators of compromise.
DNS in general is a sore subject for defenders as the log volume often becomes substantially large when ingesting data into the SIEM and probably one of the highest areas of visibility that threat hunters first look at. You might not want that and the sheer number of logs you receive will be substantially larger from a verbosity perspective.
Configuration files allow you to be very specific and granular about what is logged. One common method for detecting these LOLBAS is through identifying when a process is created and especially with network communications. In order to utilize regsvr While this may be useful for common detections, if an attacker obfuscates this code in anyway, it circumvents the detections commonly presented by endpoint tools.
With Sysmon and leveraging EventID 1, process creation — we could look for those specific commands however, what if we used Network Connections which is Sysmon Event ID 3 and use a combination of regsvr In this case, process creation is great to look at everything however, combining with network connections can make it even better.
Most operating systems to-date are now running Sysmon If we open up a administrative level command prompt and run Sysmon The most important pieces here are that we can use -c to update an already existing installation of Sysmon or specify a new configuration to be installed. We can also uninstall with -d, and -i for installation of Sysmon.Dulux weathershield exterior wood preservative primer
The way the Sysmon configuration works is we have a few different options to include or exclude and these can be nested. For example, we can exclude specific noisy process creations and include everything else if we wanted. In the example above, we would look specifically for regsvr We can see from the Event ID 1, that regsvr We can also see that the ParentImage parent process was cmd. Some other useful fields are User user logged int hat executedhashes used if renamingand ParentCommandLine.
Below is an example of just looking for just network connections and regsvr In this case we will look for regsvr In a normal corporate network, this would be an unusual behavior.
Our recommendation is to leverage more network connection detections and baseline usual behavior and monitor for deviations of those patterns for better detection. This is a great view of what happened and where regsvr In this example though we lost some valuable information such as CommandLine which could be very valuable. In regsvr This is only one example and there are many more examples that can be used with Sysmon.
There are new indicators coming out all of the time and what is fantastic about Sysmon is the ability to make changes to just the configuration file and then update the configuration without a need for a reboot. For the newly released DNS lookup feature Event ID 22you have the ability to trace down specific processes and the DNS names they looked up in order to look for indicators of compromise. DNS is a treasure trove for identifying potentially malicious domains or hosts that are compromised in general.
There are a number of ways to tackle this new feature with Sysmon. Other alternate strategies depending on your organizations deployment schedule you could exclude noisy domains but also only include malicious domains that your team identifies. This would only send back malicious domains that have been previously discovered and remove the ability for threat hunters to identify new domains, but it would reduce the noise and events that are sent back.
From the screenshot above, we can see the Image that was loaded which was regsvr This is a specific example where we have a specific LOLBAS calling out to a domain name which could be a great detection for us. As mentioned above our recommendation is to leverage all DNS queries in a central location to perform better threat hunting exercises.
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One tool in particular that is a favorite among security professionals is Sysmon. Sysmon is a service and device driver, that once installed on a system, logs indicators that can greatly help track malicious activity in addition to help with general troubleshooting. One great feature of Sysmon is that it logs many important events in one place. Instead of attempting to combine events from different logs to troubleshoot, depending on the information you are looking for, you can just view the Sysmon log instead.
Once downloaded you have several options on how to configure the Sysmon, such as logging network connections and different type of hashes. In this example, I want to install Sysmon and log md5, sha hashes and network connections. You also have the option of using a configuration file, which can further nail down what you would like to log. You can use the Event viewer GUI in Windows to see events, but if you really want to filter through these events intelligently, I recommend using PowerShell.
With the Get-WinEvent cmdlet, we can quickly retrieve events while filtering through them with a hash table. In this example, I use Get-WinEvent to select the first event from the Sysmon log on my local machine.25.000 schritte in km
First, I filter these with a hash table, specifying the logname and id 3. Finally, I use Select-Object to only print the message field to the console. This could indicate malicious code injection. Please note that this requires Sysmon be installed on all remote machines. Due to the low resource overhead of the service, many organizations even install Sysmon by default on all Windows computers. Sysmon on its own is a great tool to use for malicious logging, but used with a SIEM can really help security professionals track activity much easier.
With that said, even without a SIEM you can combine Sysmon with PowerShell in order to get some phenomenal insight into your environment.If you have ever worked with Splunk, Winlogbeat is similar in nature to the Universal Forwarder.
Sysmon is a great tool from Sysinternals that can provide some very useful information, the kind of data that would often require an EDR solution.
This includes process creation events, command line activity, network connections, and much more. All of this information is logged into the Windows Event Logs, which means Winlogbeat can be used to pickup these logs and send them over to the ELK stack for analysis. You can find the config file here: SwiftOnSecurity — Sysmon-Config Extract both Sysmon and the configuration file, and then copy both files to their permanent home.
I am only going to talk about module and script block logging here, not transcription as those logs get logged to flat files and not the Event Viewer. PowerShell logs are located in two different locations in the Event Viewer, with the more valuable module and script block logs being a little more buried and often over looked because of this.
With the additional logging enabled, the Winlogbeat configuration file needs updated with the additional log locations, and then after a simple service restart the logs will be off to the ELK server.
And the logs start flowing in:. This means installation process can be easily repeated on additional hosts as needed, or even better — scripted out and pushed via GPO or SCCM to enable logging from all of the hosts in the environment. I hope you enjoyed this series and found it useful in some way! Thanks for reading! Download the Winlogbeat package for Windows in.Uj honours bursary application 2020
Configure what output to use when sending the data collected by the beat. Array of hosts to connect to. Optional protocol and basic auth credentials. The Logstash hosts. Please visit the documentation for the complete details of each option.
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