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emorlang_FTNT
Staff
emorlang_FTNT
Staff
March 19, 2026

Technical Tip: Using FortiAnalyzer to detect activities related to the Interlock Ransomware Attack

  • March 19, 2026
  • 0 replies
  • 281 views
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 leverage the Interlock Ransomware Attack. A report is also provided to gain historical visibility into the logs.

 

Note that this article provides alpha files which 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 logs from other Fortinet products that can be used to detect the attack in addition to FortiGate logs.
Solution

What is included in Fortinet_Interlock Ransomware Attack.zip:

  1. Interlock Ransomware Attack_event-handler.json: This event handler helps identify Interlock Ransomware Attacks detected by FortiGate and other Fortinet products. This event handler is configured for Fabric ADOMs.
  2. Interlock Ransomware Attack_report.dat: This report displays the findings on Interlock Ransomware Attacks from FortiGate and other Fortinet products. It is configured for Fabric ADOMs.
  3. fgt_Interlock Ransomware Attack_event-handler.json: The event handler for FortiGate ADOMs is configured for FortiGate logs only.
  4. fgt_Interlock Ransomware Attack_report.dat: The FortiGate ADOMs report includes only FortiGate charts.

 

Steps:

  1. Download the Fortinet_Interlock Ransomware Attack.zip file (contains 4 files).
  2. Unzip Fortinet_Interlock Ransomware Attack.zip.
  3. Import Interlock Ransomware Attack_event-handler.json or fgt_Interlock Ransomware Attack_event-handler.json event handler:
  • Choose an ADOM (if ADOMs are enabled). The ADOM may have the Fabric or FortiGate type.
  • Go to the Event Handlers module.
  • 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.

 

Import Interlock Ransomware Attack_report.dat or fgt_Interlock Ransomware Attack_report.dat to Reports:

  • Choose an ADOM (if ADOMs are enabled). The ADOM may have the Fabric or FortiGate type.
  • Go to 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 Interlock Ransomware Attack_report can be run anytime as determined by an admin user.
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