Explanation
According to the CrowdStrike Falcon Data Replicator (FDR) Add-on for Splunk Guide, IOA exclusions allow you to exclude files or directories from being detected or blocked by CrowdStrike's indicators of attack (IOAs), which are behavioral rules that identify malicious activities1. This can reduce false positives and improve performance1. When you configure and apply an IOA exclusion, the impact is that the associated detection will be suppressed and theassociated process would have been allowed to run1. This means that you will not see any alerts or events related to that IOA in the console1.

Explanation
According to the CrowdStrike Falcon Data Replicator (FDR) Add-on for Splunk Guide, Sensor Visibility Exclusions allow you to exclude certain files or directories from being monitored by the CrowdStrike sensor, which can reduce noise and improve performance2. This means that no events will be collected or sent to the CrowdStrike Cloud for those files or directories2.

Explanation
According to the CrowdStrike Falcon Devices Add-on for Splunk Installation and Configuration Guide v3.1.5+, the Hash Execution Search tool allows you to search for one or more SHA256 hashes and view a summary of information from Falcon events that contain those hashes1. The summary includes the hostname, sensor ID, OS, country, city, ISP, ASN, and geolocation of the host that loaded or executed those hashes1. You can also see a count of detections and incidents related to those hashes1.

Explanation
According to the [MITRE ATT&CK website], MITRE ATT&CK is a knowledge base of adversary behaviors and techniques based on real-world observations. The knowledge base is organized into tactics and techniques, where tactics are the high-level goals of an adversary, such as initial access, persistence, lateral movement, etc., and techniques are the specific ways an adversary can achieve those goals, such as phishing, credential dumping, remote file copy, etc. Defense Evasion is one of the tactics defined by MITRE ATT&CK, which covers actions that adversaries take to avoid detection or prevent security controls from blocking their activities. Eternal Blue, Emotet, and Phishing are examples of techniques, not tactics.

Explanation
According to the CrowdStrike Falcon Data Replicator (FDR) Add-on for Splunk Guide, detection data is stored in the CrowdStrike Cloud for 90 days before purging begins2. This means that you can access and view detections from the past 90 days using the Falcon platform or API2. If you want to retain detection data for longer than 90 days, you can use FDR to replicate it to your own storage system2.