CrowdStrike CCFH-202 - CrowdStrike Certified Falcon Hunter

A threat hunting framework is a methodology that guides threat hunters in planning, executing, and improving their threat hunting activities. A benefit of using a threat hunting framework is that it provides actionable, repeatable steps to conduct threat hunting in a consistent and efficient manner. A threat hunting framework does not automatically generate incident reports, eliminate false positives, or provide high fidelity threat actor attribution, as these are dependent on other factors such as data sources, tools, and analysis skills.

 The Linux Sensor report is where an analyst would find information about shells spawned by root, Kernel Module loads, and wget/curl usage. The Linux Sensor report is a pre-defined report that provides a summary view of selected activities on Linux hosts. It shows information such as process execution events, network connection events, file write events, etc. that occurred on Linux hosts within a specified time range. The Sensor Health report, the Sensor Policy Daily report, and the Mac Sensor report do not provide the same information.

_time is the SPL (Splunk) field name that can be used to automatically convert Unix times (Epoch) to UTC readable time within the Falcon Event Search. It is a default field that shows the timestamp of each event in a human-readable format. utc_time, conv_time, and time are not valid SPL field names for converting Unix times to UTC readable time.

A Falcon threat hunting lead is a piece of information that can be used to initiate or guide a threat hunting activity within the Falcon platform. A routine threat hunt query showing process executions of single letter filename (e.g., a.exe) from temporary directories is an example of a Falcon threat hunting lead, as it can indicate potentialmalicious activity that can be further investigated using Falcon data and features. Security appliance logs, help desk tickets, and external reports are not examples of Falcon threat hunting leads, as they are not directly related to the Falcon platform or data.

 The ParentProcessld_decimal event field is what the Process Timeline Events Details table will populate the Parent Process ID and the Parent File columns with when the cloudable Event data contains it. The ParentProcessld_decimal event field is the decimal representation of the process identifier for the parent process of the target process. It can be used to trace the process ancestry and identify potential malicious activity. The ContextProcessld_decimal, RawProcessld_decimal, and RpcProcessld_decimal event fields are not used to populate the Parent Process ID and the Parent File columns.

 To view Files Written to Removable Media within a specified timeframe on a host within the Host Search page, you need to expand and refer to the Suspicious File Activity dashboard panel. The Suspicious File Activity dashboard panel shows information such as files written to removable media, files written to system directories by non-system processes, files written to startup folders, etc. The other dashboard panels do not show files written to removable media.

This is the difference between a Host Search and a Host Timeline. A Host Search is an Investigate tool that allows you to view events by category, such as process executions, network connections, file writes, etc. A Host Timeline is an Investigate tool that allows you to view all events in chronological order, without any categorization. Both tools can be used for detection investigation and proactive hunting, depending on the use case and preference. You can access a Host Search from a detection or manually enter the host details. You can also populate the Host Timeline fields manually or from other pages in Falcon.

Discovering internet-facing servers is an example of actor actions during the RECONNAISSANCE phase of the Cyber Kill Chain. The RECONNAISSANCE phase is where the adversary researches and identifies targets, vulnerabilities, and attack vectors. Discovering internet-facing servers is a way for the adversary to find potential entry points or weaknesses in the target network.

 Lateral movement through a victim environment is an example of the Command & Control stage of the Cyber Kill Chain. The Cyber Kill Chain is a model that describes the phases of a cyber attack, from reconnaissance to actions on objectives. The Command & Control stage is where the adversary establishes and maintains communication with the compromised systems and moves laterally to expand their access and control.