CCFR-201 CrowdStrike Certified Falcon Responder Questions and Answers

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. The knowledge base also covers different platforms that adversaries target, such as Windows, Linux, Mac, Android, iOS, etc., and different phases of an adversary’s lifecycle, such as reconnaissance, resource development, execution, command and control, etc.

According to the CrowdStrike Falcon Devices Add-on for Splunk Installation and Configuration Guide v3.1.5+, the Bulk Domain Search tool allows you to search for one or more domains and view a summary of information from Falcon events that contain those domains1. The summary includes the domain name, IP address, country, city, ISP, ASN, geolocation, hostname, sensor ID, OS, process name, command line, and organizational unit of the host that communicated with those domains1. This means that the tool contains domain information along with IP lookup information1.

According to the CrowdStrike Falcon Devices Add-on for Splunk Installation and Configuration Guide v3.1.5+, Reduced Functionality Mode (RFM) is a state where a host’s sensor has limited functionality due to various reasons, such as license expiration, network issues, tampering attempts, etc1. You can find hosts that are in RFM by using the Host Search tool and filtering by Sensor Status = RFM1. You can also view details about why a host is in RFM by clicking on its hostname1.

According to the CrowdStrike Falcon Devices Add-on for Splunk Installation and Configuration Guide v3.1.5+, the Host Search allows you to search for hosts based on various criteria, such as hostname, IP address, OS, etc1. The results are displayed in an organized view by type, such as detections, incidents, processes, network connections, etc1. The Host Timeline allows you to view all events recorded by the sensor for a given host in a chronological order1. The events include process executions, file writes, registry modifications, network connections, user logins, etc1.

According to the CrowdStrike Falcon Devices Add-on for Splunk Installation and Configuration Guide v3.1.5+, the Full Detection Details tool allows you to view detailed information about a detection, such as detection ID, severity, tactic, technique, description, etc1. You can also view the events generated by the processes involved in the detection in different ways, such as process tree, process timeline, or process activity1. The process activity view provides a rows-and-columns style view of the events, such as DNS requests, registry operations, network operations, etc1. You can also export this view to a CSV file for further analysis1.

According to the [CrowdStrike Falcon Devices Add-on for Splunk Installation and Configuration Guide v3.1.5+], event types are categories of events that are generated by the sensor for various activities, such as process executions, file writes, registry modifications, network connections, etc. There are many valid event types, such as StartOfProcess, ProcessRollup2, DnsRequest, etc. However, EndOfProcess is not a valid event type, as there is no such event that records the end of a process.

According to the [CrowdStrike Falcon® Data Replicator (FDR) Add-on for Splunk Guide], when you quarantine a file from a host using IOC Management or Real Time Response (RTR), you are moving it from its original location to a secure location on the host where it cannot be executed. The file is also encrypted and renamed with a random string of characters. A copy of the file is also uploaded to the CrowdStrike Cloud for further analysis. Quarantined files are stored in the CrowdStrike Cloud for 90 days before they are deleted.

According to the CrowdStrike Falcon® Data Replicator (FDR) Add-on for Splunk Guide, the allowlist feature allows you to exclude files or directories from being scanned or blocked by CrowdStrike’s machine learning engine or indicators of attack (IOAs)2. This can reduce false positives and improve performance2. When you allowlist a hash, you are allowing that file to execute on any host that belongs to your organization’s CID (customer ID)2. This does not affect other Falcon customers or hosts outside your CID2.

According to the CrowdStrike Falcon® Data Replicator (FDR) Add-on for Splunk Guide, you can use the Hosts page in the Investigate tool to view information about your endpoints, such as hostname, IP address, OS, sensor version, etc2. You can also see a list of managed and unmanaged neighbors for each endpoint, which are other devices that have communicated with that endpoint over the network2. This can help you identify potential threats or vulnerabilities in your network2.

According to the CrowdStrike Falcon Devices Add-on for Splunk Installation and Configuration Guide v3.1.5+, there are three ways to export process event data from a detection in .CSV format1:

• You can use the Process Timeline tool and click on “Export CSV” button at the top right corner1.
• You can use the Event Search tool and select one or more events and click on “Export CSV” button at the top right corner1.
• You can use the Full Detection Details tool and choose the “View Process Activity” option from any process node in the process tree view1. This will show you all events generated bythat process in a rows-and-columns style view1. You can then click on “Export CSV” button at the top right corner1.

According to the CrowdStrike Falcon® Data Replicator (FDR) Add-on for Splunk Guide, the Falcon platform will show a maximum of 1000 detections per day for a single AID1. This is a limitimposed by the Falcon API, which is used to retrieve the detections from the CrowdStrike Cloud1. If there are more than 1000 detections per day for a single AID, only the first 1000 will be shown1.

According to the CrowdStrike Falcon® Data Replicator (FDR) Add-on for Splunk Guide, when you release a file from quarantine, you are restoring it to its original location and allowing it to execute on any host in your organization2. This action also removes the file from the quarantine list and deletes it from the CrowdStrike Cloud2.

According to the CrowdStrike Falcon® Data Replicator (FDR) Add-on for Splunk Guide, IOC Management allows you to manage indicators of compromise (IOCs), which are artifacts such as hashes, IP addresses, or domains that are associated with malicious activities2. You can set different actions for IOCs, such as Allow, No Action, or Always Block2. When you set a hash to Always Block through IOC Management, you are preventing that file from executing on any host in your organization by default2. This action also generates a detection alert when the file is blocked2.

According to the CrowdStrike Falcon® Data Replicator (FDR) Add-on for Splunk Guide, when you release a file from quarantine, you are restoring it to its original location and allowing it to execute on any host in your organization1. This action also removes the file from the quarantine list and deletes it from the CrowdStrike Cloud1.

According to the CrowdStrike Falcon Devices Add-on for Splunk Installation and Configuration Guide v3.1.5+, the IP Search tool allows you to search for an IP address and view a summary of information from Falcon events that contain that IP address1. The summary includes the hostname, sensor ID, OS, country, city, ISP, ASN, and geolocation of the host that communicated with that IP address1.