sysmon splunk threat hunting

- The threathunting index is now customizable in a macro Overview Details This is a Splunk application containing several hunting dashboards and over 120 reports that will facilitate initial hunting indicators to investigate. You want to identify whether the Supernova trojanized DLL have been loaded to a . For more information, visitwww.hurricanelabs.comand follow us on Twitter@hurricanelabs. Splunk AD Threat hunting - Amr Ashraf Extract the .zip file. In addition, these Splunk resources might help you understand and implement this use case: Still need help with this use case? Splunking with Sysmon - GISPP However once you have the logs as part of Windows Event Logs , any SIEM Solution will be able to collect it and analyze it . I strive to map all searches to the ATT&CK framework. A majority of the talk was focused on hunting and the methodology I implement. Hunting the Known Unknowns (With PowerShell), Incident Response is Dead Long Live Incident Response, Introducing the Security Investigation Guided Online Experience. The wildcard character (*) at the beginning and end of the string allows us to to pattern match without having to know the full directory path for the TotesSecure Tool Scripts directory. Threat hunting and Incident response tactics and procedures have evolved rapidly over the past several years. Thanks for sharing. })(window,document,'script','dataLayer','GTM-TPV7TP');/*]]>*/ Although . Sysmon (System Monitor) is part of the Windows Sysinternals Suite and can be downloaded for free. Added a Sysmon tuning dashboard - Rebuilt some dashboards to have a significant speed increase and more efficient searches Sysmon is so much fun to use it almost makes me want to go back into operational security.almost. Most customers haveOnDemandServicesper theirlicense support plan. Splunk, Splunk>,Turn Data Into Doing, Data-to-Everything, and D2E are trademarks or registered trademarks of Splunk Inc. in the United States and other countries. Twotypes of data you can use for capturing new process creation events are: Windows Security Event Logs with Event ID 4688,includingcommand line in process creation events. - lateral movement indicator dashboard overhaul, plus new panels Of course, while the intended users were system administrators, security researchers began to take a closer look at the scripting language. 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SECURITY A Salacious Soliloquy on Sysmon By June 21, 2018 This blog post is part sixteen of the "Hunting with Splunk: The Basics" series. j=d.createElement(s),dl=l!='dataLayer'? Eventually, bad guys discovered the advantage of using Powershell for payload delivery, persistence, lateral movement, etc. - Initial mapping of Windows 4768/9 events in props.conf You obviously need to be ingesting Sysmon data into Splunk, a good configuration can be found in the details Required actions after deployment: Make sure the threathunting index is present on your indexers Edit the macro's to suit your environment Install the required addons Install the lookup csv's or create them yourself, empty csv's are here. Last Updated: 2023-05-23 This integration not only enhances their ability to accelerate threat detection and investigation of AWS data, but also helps them ensure their compliance with data retention and regulatory requirements." We could continue iterating further and further back if we chose to as well if that was required in our hunt. We need to perform these steps in order to have a successful Integration . The spaces=50 definition helps youformat the resulting table so that the first column doesnt contain lots of wasted space. Were looking for all EventCode 4688 entries (process creation). Additional essential pieces of information that we can gather as part of this process creation event are the hashes; MD5, SHA1, SHA256, and IMPHASH. - Added original_file_name to event_id 1 and 7 However you might be wondering on what is Sysmon and why do you even need it in the first Place. Now you can open different applications like Firefox,Chrome,U torrent etc. Search Sysmon data for process creation events. I Got throw a writeup for an Active Directory lab environment where the author started a lateral movement in the environment which was monitored in a Splunk SIEM solution (just Event logs collected), So I will go throw every step on the attack and the resulting logs. - File create whitelist macro The PSTree for Splunk app is not supported. This field contains the value cmd.exe /c "3791.exe 2>&1" which was parent process of 3791.exe. Once file is downloaded, you can open it with any XML Editor and see if it looks OK . Try to become best friends with your system administrators. Right clicking on the file and saving it as a link as shown below will corrupt the file and you will keep banging your head in the wall if it is not working . Why all of a sudden are they running system commands now? Most things will end up at #2. To download ,you can use this Splunk download link . Here are queries for WinEventLog and Sysmon, respectively: Or, if you really wanna be crazy, use the OR operator to cover executables and/or scripts execution paths containing Legit Monitoring Agent in a single query. Big credit goes out to MITRE for creating the ATT&CK framework! - Automated search distribution Try in Splunk Security Cloud. The app is shipped without whitelist lookup files, you'll need to create them yourself. "The integration between Splunk and Amazon Security Lake enables customers to store their data in one unified format, OCSF. Another field called detail is also created, which combines the _time field information with the CommandLine field information. - added OriginalFileName mapping to file_name Zerologon CVE-2020-11472 is a technique used by attackers to target a Microsoft Windows Domain Controller to reset its computer account password. Return to the idea. Here is an example WinEventLog query, specifically looking for powershell.exe process creation events: Youll notice the first few entries are being run by Splunk. There has been plenty written about how to configure Sysmon so we wont cover that (besides, we're here to talk about hunting), but lets talk about the elephant in the room. How do you actually threat hunt? : r/cybersecurity - Reddit Threat Hunting: Hunting the Endpoint & Endpoint Analysis This course is part of the Threat Hunting Professional Learning path which prepares you for the eCTHPv2 exam and certification. For those of you who are impatient to start, or want to have a test bed to try out your awesome newfound knowledge, try the Security Investigation Online Experiencethat my esteemed colleague Erin Sweeney outlined in her blog post, "Introducing the Security Investigation Guided Online Experience.". - NEW REQUIREMENT : Event Timeline app Threat Hunting: SIEM, ELK Stack, Splunk MCSI Library current_only = 0 Release the app for all to use Here it is!Publish for GraylogAdd extraction of the process nameSplunk DatamodelLog Network ConnectionsDashboards. Mark Russinovich and the Sysinternals team had built many great Windows utilities and tools, and Sysmon is a continuation of that since their acquisition by Microsoft. You can adjust this query based on the specifics of your environment. As a matter of fact , it did happen to me . ThreatHunting | Splunkbase We can do better. We know what you're thinkingyou want me to log everything my workstations do? To download Sysmon and Sample Configuration , you can download it from Microsoft Sysmon Download Page . /*> LINK If it has, you'dalso like to know what has transpired. If you still have some doubts and you are still hesitating ,you can visit here to see one of my detailed Sysmon Installation video for the whole Process . Now in order to do that ,you can use two approaches . Threat hunting tools Sysmon. - user drilldown dashboard improved Once complete, data will begin flowing to Splunk. Extrashttps://github.com/MHaggis/hunt-detect-prevent/tree/master/SplunkAll of these along with some custom dashboards will be published shortly in a single app. Whether you use Splunk, Graylog or ELK, everything covered may be. These instances provide some interesting information including that this process was killed or that cmd.exe runs and then triggers 121214.tmp to run. Staff Picks for Splunk Security Reading May 2023 | Splunk We can also take this a step further and continue searching for other ProcessIds that match our ParentProcessId to see their relationships. However, this isnt good enough. Then, once your investigation is complete, formulate a new query focusing exclusively on results from Legit Monitoring Agent. We are going to rectify that today because we are going to talk about Microsoft Sysmon! Try in Splunk Security Cloud. You obviously need to be ingesting Sysmon data into Splunk, a good configuration can be found here. These Logs are too the Point and very useful . Everything we will create will be a report and specific reports will be ran as realtime or hourly, and may be changed based on your environment. Now that we have a background in the data found in Sysmon let's apply that to a hunt. System Monitor (Sysmon) is a Windows system service and device driver that remains resident across system reboots in order to monitor and log system activity to the Windows event log. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. function OptanonWrapper() { window.dataLayer.push( { event: 'OneTrustGroupsUpdated' } ) ; } Were going to pick on Legit Monitoring Agent to demonstrate these options with examples: Option 1:Use an overly broad filter to filter out all results containing the string Legit Monitoring Agent. If you do not know what is Sysmon then here are few Key Points to remember. Splunk RBAC Bypass On Indexing Preview REST Endpoint Splunk also released a blog post that highlights how Sysmon events can be used for threat hunting. If you are working as Security Analyst in a Security Operations Center (SOC), you must have noticed that Windows Event Logs do not always provide you the necessary Logs and if you enable Object based auditing than it generates too many logs and thus makes it difficult to get any useful results . Installation of Sysmon with Default Configuration, Installation of Sysmon with Advanced Configuration. What is the directory structure for this software (e.g. As a result,severaltoolswere developed with the red team in mind. Now we should download and Deploy Splunk . C:\Windows, normally) %WINDIR%\System32, %WINDIR%\SysWOW64, Program Files (x86), or Program Files. As a Splunkbase app developer, you will have access to all Splunk development resources and receive a 10GB license to build an app that will help solve use cases for customers all over the world. renderXml = true. checkpointInterval = 5 Try this WinEventLog query: This query builds on our initial query, with some key differences. A tag already exists with the provided branch name. Splunk's security team is addicted to using Sysmon for endpoint data. Detecting Zerologon attacks - Splunk Lantern Visualizing processes and their parent/child relationships [CDATA[*/(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': You can optimize it byspecifying an index and adjusting thetime range. OverView; SIEM Setup; Hunting; Attack Timeline; Resources; OverView. Advanced Incident Detection and Threat Hunting using Sysmon (and Splunk Engage the ODS team atOnDemand-Inquires@splunk.comif you require assistance. This is so you won't accidentally overwrite them on an upgrade of the app. - Re-added the computer investigator page This Article is about Installation of Sysmon, its configuration and then integration with Splunk Enterprise in order to do Threat Hunting . Sysmon Events can be collected by using Windows Event Collection or any SIEM Agent . Beyond that one killer feature, it can report network connections from a host and many other system states that provide greater insight than just using Windows Event logs. All three new fields, parent, child, and detail can now be used in the pstree custom command added by the PSTree app. | pstree child=child parent=parent detail=detail spaces=50. Sysmon logs investigation through Sophos XDR: Status History Well, we'll also point you toward the work that TransAlta did. Attackers can then provide themselves with high privileges and take over the Domain Controller. Splunking with Sysmon A Beginner's Guide - Medium The other thing we can see is that the ParentCommandLine where the 121214.tmp was first seen is a wscript.exe that calls the file 20429.vbs from Bob Smiths roaming profile directory. If you have any questions, complaints or Lets start by taking a look at the details found in Sysmon. Pay attention to the full path in the New_Process_Name/Image field and/or the Process_Command_Line/CommandLine. With each "Hunting with Splunk" blog post, we will continue to update this post with links to the other blogs. The last thing we will mention in this blog is around the operationalization of a hunt. The original filter string was. - Fixed a faulty field name in one of the lookups Once the app is complete I will publish another post with a walkthrough of the reports and dashboards. The Easy and best approach is to trust others and use Ready to use Sysmon Configuration files from any of these Two reliable industry Sources . We will help you create a solid base of knowledge regarding Splunk that you can then use in your own environment to hunt for evil. More or less, Splunk has a TA for Sysmon. start_from = oldest Using Workflow Actions & OSINT for Threat Hunting in Splunk, This is NOT the Data You Are Looking For (OR is it), You Cant 'Hyde' from Dr. Levenshtein When You Use URL Toolbox, Do We Calculate, Appraise, Classify, Estimate? The file should look like this . Once downloaded and Installed on your Local machine , access it with the user admin and the password that you chose during installation . I hope you found this useful on your endeavors with using Sysmon with Splunk. The difficult approach is to make a Sysmon configuration file from Scratch and keep on adding different Images for monitoring . Are service accounts suddenly running commands that they have NEVER run before? apps and does not provide any warranty or support. When we hunt, we likely will want more context than just what executed. Here are the links that will be used for the above steps . - Added Timeline graph to the overview page Big credit goes out to MITRE for creating the ATT&CK framework! Follow all the steps on the About page in the app, make sure all requirements are met. - more details on GitHub, New Features Splunk's security team is addicted to using Sysmon for endpoint data. Copy to Clipboard. This application is not a magic bullet, it will require tuning and real investigative work to be truly effective in your environment. Updated the downloadable lookup files, Changes You can also generate Logs via Atomic red team . 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that are renamed with props and transforms, Using Table Views to prepare data without SPL, Writing better searches with the Common Information Model, Following best practices for working with dashboards, Replacing null values by using the fillnull and filldown commands, Returning terms or indexed fields from event indexes with the Walklex command, Telling stories with your data using data visualizations, Troubleshooting and investigating searches, Using summary indexing to accelerate searches, Writing better queries in Splunk Search Processing Language, Creating better custom applications with the Splunk UI Toolkit, Large wire transfer immediately after account activation, Multiple account login denials followed by authorization, Number of wire transfers exceeds threshold, Wire transfers from multiple client IP addresses, Wire transfers into suspicious or banned countries, Monitoring consumer credit card transactions, Monitoring new logins to financial applications, Reporting on key 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storage, Capacity utilization runway in Dell Isilon NAS, CPU utilization calendar for Dell Isilon NAS, Top audit failures by user in Dell Isilon NAS, Managing printers in a Windows environment, Spikes in printer activity in a Windows environment, Measuring storage speed I/O utilization by host, Monitoring VMware virtualization infrastructure, ESXi hosts with high CPU Ready summation value, ESXi hosts with sustained high ballooning, Virtual machines with large file size utilization, VMotion events for a specific virtual machine, VMware datastores with highest utilization, Investigating user login issues and account lockouts, Preparing for certificate-based authentication changes on Windows domain controllers, Recovering lost visibility of IT infrastructure, Inventory of devices reporting network data, Using stack traces to detect application errors, Use Cases for Security with Splunk Platform, Detecting AWS suspicious provisioning activities, Complying with the Markets in Financial Instruments Directive II, Defining and detecting Personally Identifiable Information (PII) in log data, Identifying new Windows local admin accounts, Monitoring consumer bank accounts to maintain compliance, Monitoring NIST SP 800-53 rev5 control families, NIST SP 800-53 identification and authentication, NIST SP 800-53 system and information integrity, Device owner identified using a MAC address, Machine leasing an IP address at a particular time, Recognizing improper use of system administration tools, Registry keys used for privilege escalation, Running common General Data Protection Regulation (GDPR) compliance searches, Geographically improbable access detected, Creating a timebound picture of network activity, Hosts logging data in a certain timeframe, Hosts logging more or less data than expected, Connections between network devices and an individual machine, Files a user uploaded to a network file share, File added to the system through external media, File downloaded to a machine from a website, IP address identification based on host name, Investigating unusual file system queries, Responding to incidents with the Splunk platform and Fox-IT's Dissect, Badge readers with abnormally high read failures, Monitoring for network traffic volume outliers, Network traffic patterns between a source-destination pair, Number of connections between unique source-destination pairs, Percentage of total bytes out from a source to a single destination, Volume of traffic between source-destination pairs, Most commonly accessed business applications, Number of all Zoom meetings created over time, Securing infrastructure-as-code with Zscaler Posture Control, Securing medical devices from cyberattacks, Schtasks.exe registering binaries or scripts to run from a public directory, Server Message Block (SMB) traffic connection spikes, Wmic.exe launching processes on a remote system, Detecting domain trust discovery attempts, Detecting malicious activities with Sigma rules, Detecting malicious file obfuscation using certutil.exe, Anomaly probability calculation with JA3/JA3s hashes, Lookup table creation for scalable anomaly detection with JA3/JA3s hashes, Rarest JA3s hashes and server combinations, Windows process and JA3s hash correlation, File hashes associated with the Supernova trojanized DLL, Detecting the disabling of security tools, Detecting the use of randomization in cyberattacks, Processes launched from randomized file paths, Detecting threats in a Hyperledger Fabric multi-party computation system, Finding interactive logins from service accounts, Monitoring a network for DNS exfiltration, DNS tunneling through randomized subdomains, New application accessing the Salesforce API, New high-risk event types for a Salesforce cloud user, New tables queried by a Salesforce cloud peer group, New tables queried by a Salesforce cloud user, Spike in exported records from Salesforce cloud, IP address attempting a brute force password attack, IP address 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