Technical Tip: Using FortiAnalyzer to detect activities related to the Prestige Ransomware

[fduncan]

Description	This article describes how to use a custom event handler in FortiAnalyzer to raise alerts for incident response related to attacks that attempt to deploy Prestige ransomware. A report is also provided to gain historical visibility into logs. Note that this article provides alpha files that are automatically generated. The article will be continually updated as more information becomes available.
Scope	This article contains the files necessary to load an event handler and report into the FortiAnalyzer for either a Fabric ADOM or a FortiGate ADOM. The Fabric report and event handler leverage log from other Fortinet products that can be used to detect the attack in addition to FortiGate logs.
Solution	What is included in Fortinet_Prestige_Ransomware.zip? 1) Prestige_Ransomware_event-handler.json This event handler helps identify Prestige Ransomware detected by FortiGates and other Fortinet products. 2) Prestige_Ransomware_Report.dat This report displays the findings on Prestige Ransomware attacks from FortiGates and other Fortinet products.  3) fgt_Prestige_Ransomware _event-handler.json The event handler for FortiGate ADOMs is configured for FortiGate logs only. 4) fgt_Prestige_Ransomware _Report.dat The report for FortiGate ADOMs includes FortiGate charts only. Steps. 1) Download the Fortinet_Prestige_Ransomware.zip file (contains 4 files). 2) Unzip Fortinet_Prestige_Ransomware.zip. 3) Import Prestige_Ransomware_event-handler.json or fgt_Prestige_Ransomware_event-handler.json event handler: - Choose an ADOM (if ADOMs are enabled). The ADOM may be of type 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 Prestige_Ransomware_report.dat or fgt_Prestige_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 Prestige Ransomware Report can be run anytime as determined by an admin user.