Technical Tip: Using FortiAnalyzer to detect Hive Ransomware attacks | CVE-2021-31207, CVE-2021-34473, CVE-2021-34523, CVE-2021-42321

[ck_FTNT]

Description	This article describes how to use a custom event handler in FortiAnalyzer to raise alerts for incident responses related to Hive Ransomware attacks. A report is also provided to gain historical visibility into logs.
Scope	This article contains the files necessary to load an event handler and report into FortiAnalyzer for either a Fabric ADOM or a FortiGate ADOM. The Fabric report and event handler leverage logs from other Fortinet products that can be used to detect the attack in addition to FortiGate logs. For more information about this attack, see the following threat signal: https://www.fortiguard.com/threat-signal-report/4889/alert-aa22-321a-stopransomware-hive-ransomware
Solution	What is included in Fortinet_Hive_Ransomware.zip? 1) Hive_Ransomware_event-handler.json This event handler helps identify Hive_Ransomware detected by FortiGates and other Fortinet products. 2) Hive_Ransomware_report.dat This report displays the findings on Hive_Ransomware attacks from FortiGates and other Fortinet products.  3) fgt_Hive_Ransomware_event-handler.json The event handler for FortiGate ADOMs is configured for FortiGate logs only. 4) fgt_Hive_Ransomware_report.dat The report for FortiGate ADOMs includes FortiGate charts only. Steps 1) Download the Fortinet_Hive_Ransomware.zip file (contains 4 files). 2) Unzip Fortinet_Hive_Ransomware.zip. 3) Import Hive_Ransomware_event-handler.json or fgt_Hive_Ransomware_event-handler.json event handler: - Choose an ADOM (if ADOMs are enabled). The ADOM type may be Fabric or FortiGate: - Choose the FortiSOC module.  - Select Event Handler List. - Select the Import option under More. - Select the appropriate event handler depending on the ADOM type. Result: The event handler is enabled and will be triggered if the appropriate logs are received following the import of the event handler.  Edit the event handler to customize the notification section. 4) Import Hive_Ransomware_report.dat or fgt_Hive_Ransomware_report.dat to Reports: - Choose an ADOM (if ADOMs are enabled). ADOM may be of type Fabric or FortiGate. - Choose the Report module. - Select the Import option under 'More'. - Select the appropriate file for the ADOM type to add the report to the ADOM. Result:  The Hive_Ransomware_report can be run at any time as determined by an admin user.