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Least 20GB space in /opt You can update this.check_disk_space "/opt" 20# Add a new user named "splunk" with a disabled password. This can also be something like "splunkfwd" like we dicussed.adduser splunk --disabled-password# Change directory to /tmp/cd /tmp/# Download the Splunk Universal Forwarder release. Make sure you check for the latest version at splunk.com.wget -O splunkforwarder.tgz " Check if wget was successful in downloading the fileif [ $? -ne 0 ]; then echo "Failed to download the Splunk Universal Forwarder. Please check the URL or try again later." exit 1fi# Extract the downloaded tarball to /opt/tar -zxvf /tmp/splunkforwarder.tgz -C /opt/# Change ownership of the /opt/splunkforwarder/ directory to the splunk userchown -R splunk: /opt/splunkforwarder/# Create necessary directories and configuration files under the splunk user's home directorysu - splunk -c 'mkdir -p /opt/splunkforwarder/etc/apps/ZZ_local_deploymentclient/local/'su - splunk -c 'echo -e "[target-broker:deploymentServer]\ntargetUri = splunk.bearlychilly.com:8089" > /opt/splunkforwarder/etc/apps/ZZ_local_deploymentclient/local/deploymentclient.conf'su - splunk -c 'echo -e "# Deployment Client local app" > /opt/splunkforwarder/etc/apps/ZZ_local_deploymentclient/local/app.conf'# Start Splunk for the first time and accept the license agreementsu splunk -c "/opt/splunkforwarder/bin/splunk start --accept-license --answer-yes --no-prompt --gen-and-print-passwd"# Check if Splunk start was successfulif [ $? -ne 0 ]; then echo "Failed to start Splunk Universal Forwarder. Please check the installation." exit 1fi# Stop Splunk to make necessary configurationssu - splunk -c '/opt/splunkforwarder/bin/splunk stop'# Enable Splunk to start at boot using the "splunk" user/opt/splunkforwarder/bin/splunk enable boot-start -user splunk# Start the Splunk Forwarder using systemctlsystemctl start SplunkForwarder# Clean up by removing the downloaded tarballrm -f /tmp/splunkforwarder.tgz# Check running Splunk processes using grepps -aux | grep -i "splunk"

The Collector package, replace to splunk-otel-collector deb/rpm> with the local path to the downloaded Collector package.apt-get update && apt-get install -y libcap2-bin # Required for enabling cap_dac_read_search and cap_sys_ptrace capabilities on the Collectordpkg -i to splunk-otel-collector deb>See also:Post-install configuration for Debian/RPMZero-code instrumentation with Debian and RPM packagesInstall and configure Fluentd for log collectionPost-install configuration for Debian/RPM 🔗The following applies:The default configuration file is installed in /etc/otel/collector/agent_config.yaml, if it doesn’t already exist.The /etc/otel/collector/splunk-otel-collector.conf environment file is required to start the splunk-otel-collector systemd service.The service automatically starts if this file exists during install or upgrade.A sample environment file is installed to /etc/otel/collector/splunk-otel-collector.conf.example, and it includes the required environment variables for the default config. To use this sample file, set the variables as you require, and save the file as /etc/otel/collector/splunk-otel-collector.conf.You must restart the service for any changes to the config file or environment file to take effect. To start or restart the service, run:sudo systemctl restart splunk-otel-collectorTo check the splunk-otel-collector service status, run:sudo systemctl status splunk-otel-collectorTo view the splunk-otel-collector service logs and errors in the systemd journal run:sudo journalctl -u splunk-otel-collectorZero-code instrumentation with Debian and RPM packages 🔗If you prefer to install the Collector without the installer script or the Debian/RPM repositories, download the individual Debian or RPM package from the GitHub releases page and install it as shown below.Note that:You need to have root privileges.Download the appropriate splunk-otel-auto-instrumentation Debian or RPM package for the target system in GitHub at Splunk OTel Collector releases .Replace to splunk-otel-auto-instrumentation deb/rpm> with the local path

Sysmon2splunkGenerating Sysmon events with the SwiftOnSecurity configuration and ingesting/normalizing the dataset in a remote Splunk instance.ObjectivesUse Microsoft Sysinternals Sysmon on several Microsoft Windows endpoints to generate granular security-related event logs.Push the Sysmon event logs to an index on a remote Splunk virtual machine.Parse all the things.PrerequisitesSplunk serverRequirementsSplunk.com AccountSplunk Universal ForwarderMicrosoft Windows HostMicrosoft Sysinternals SysmonSwiftOnSecurity Sysmon ConfigText EditorSysmonWhat is Sysmon?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. configThe Sysmon configuration file from SwiftOnSecurity provides high-quality event tracing to support threat hunting, compromise assessments, incident response, etc. is Splunk?Splunk is a powerful data analytic tool that allows for the parsing and visualizations of big data. Splunk deployments can have several different architectures but for the purpose of this write-up, all components of Splunk have been deployed into a single VM. A Splunk.com Account will be required to download the necessary components of this capability.Universal ForwarderSplunk utilizes its own Universal Forwarder to send data to the Splunk indexer. In this case, the data sent from our endpoints to the Splunk server will be our Sysmon event logs. Add-on for Microsoft SysmonThe Splunk Add-on for Microsoft Sysmon is a highly-rated application built by Splunk Works in an effort to provide a data input and CIM-compliant field extractions for Microsoft Sysmon. Essentially, this add-on will

Environment variables, and their values depend on the installation method, as well as your specific needs.CautionYou need systemctl to run the Collector as a service, since it’s the main tool used to examine and control the state of the systemd system and service manager. Otherwise, you need to run the Collector.Install the Collector for Linux with Debian 🔗To install the Collector for Linux using a Debian package, set up the package repository and install the Collector package:curl -sSL > /etc/apt/trusted.gpg.d/splunk.gpgecho 'deb release main' > /etc/apt/sources.list.d/splunk-otel-collector.listapt-get updateapt-get install -y splunk-otel-collector# Optional: install Splunk OpenTelemetry automatic discovery for language runtimesapt-get install -y splunk-otel-auto-instrumentationSee also:Post-install configuration for Debian/RPMZero-code instrumentation with Debian and RPM packagesInstall and configure Fluentd for log collectionInstall the Collector for Linux with RPM 🔗To install the Collector for Linux using a RPM package, set up the package repository and install the Collector package:yum install -y libcap # Required for enabling cap_dac_read_search and cap_sys_ptrace capabilities on the Collectorcat /etc/yum.repos.d/splunk-otel-collector.repo[splunk-otel-collector]name=Splunk OpenTelemetry Collector Repositorybaseurl= install -y splunk-otel-collector# Optional: install Splunk OpenTelemetry zero-code instrumentationyum install -y splunk-otel-auto-instrumentationSee also:Post-install configuration for Debian/RPMZero-code instrumentation with Debian and RPM packagesInstall and configure Fluentd for log collectionInstall the Collector for Linux with downloaded packages 🔗If you prefer to install the Collector without the installer script or the Debian/RPM repositories, download the individual Debian or RPM package from the GitHub releases page and install it as shown below.Note that:You need to have root privileges.Find the releases in GitHub at Splunk OTel Collector releases .To install the setcap dependency and

This guide will walk you through the process of installing a Linux Splunk Universal Forwarder (UF) with the aim of automating the process. Before we begin, here are some important notes:Ensure that the host has wget.If the host uses SELinux (getenforce to check), you may need to create policies to allow Splunk to function correctly (e.g., reading logs from /var/log).Choose a user for the Splunk UF to run as (e.g., splunk or splunkfwd). As a best practice, avoid running Splunk as the root user to minimize the consequences of a service compromise. Note that running Splunk as a non-root user may require additional configurations, especially if SELinux is active, but it is the recommended approach.Create a DNS record for the Deployment Server (DS) that clients will reach out to. This will make it easier to change the DS’s IP address in the future.The ProcessSwitch to the root user or use sudo throughout the guide. The commands will assume that you are running as root, unless explicitly instructed to switch to the Splunk UF user.Create a user for Splunk with no password. We will switch to this user later using the root user or another user with root privileges (su splunk).adduser splunk --disabled-passwordCheck if the host has enough space for the UF installation.Switch to the /tmp directory and download the Splunk UF Tarball. Get the updated tgz link from here.cd /tmp/wget -O splunkforwarder.tgz " the package to the /opt/ directory, which is the standard practice.tar -zxvf /tmp/splunkforwarder.tgz -C /opt/Update the ownership of the directory to the Splunk user you created earlier.chown -R splunk: /opt/splunkforwarder/Optional: If your host is using ACLs, you can use the following commands to allow the Splunk user to read from the specified directories (if you are planning to read from them.) If your host is using SELinux, there are more hands-on steps you will need to take. Use getenforce to see if you are leveraging SELinux and do some research into the configurations/policies you will need to make. I advice against simply setting SELinux to permissive or disabling SELinux as a solution.setfacl --recursive -m g:splunk:rx /var/log/setfacl --recursive

Splunk for NonprofitsSplunk is committed to helping our nonprofit partners around the world take on some of the toughest challenges: extreme poverty, disaster and humanitarian response, and building resilient and sustainable communities. Nonprofits face many of the same challenges as the private sector, but are often constrained by limited resources and funding.The Splunk Global Impact’s Donation Program provides access to free software and eLearning as well as complimentary support for organizations receiving technology donations, to ensure each beneficiary can make full use of the power of Splunk. Successful registration also unlocks preferred access to discount pricing on Splunk Enterprise, Splunk Cloud, and Splunk premium apps such as Enterprise Security and IT Service Intelligence.Splunk Global Impact’s Donation Program includes:Renewable one-year, 10GB license for Splunk software for freeComplimentary e-learning access8 hours of pro-bono support to get you up and running (pending availability)To qualify, your organization must meet the following criteria:Be a US-based 501c3 nonprofit organization OR a certified international charity OR a public or private not-for-profit academic institution.Agree to Splunk’s Nonprofit Eligibility Criteria*If you don't qualify for our Splunk Global Impact Donation Program, you may still download and install Splunk software for free and start analyzing data in minutes.*All fields are required unless noted. This form must be completed by an official of the organization. You MUST enter a valid physical mailing address (no PO Boxes) to be eligible. Product Donation Program registration is required to qualify for preferred nonprofit pricing.