FunkLocker Ransomware File Creation

Description

Detects the creation of files with the ".funksec" extension, which is appended to encrypted files by the FunkLocker ransomware.

Query · sigma

selection:
  TargetFilename|endswith: .funksec
condition: selection

Known false positives

  • Unlikely
Raw source FunkLocker Ransomware File Creation · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: FunkLocker Ransomware File Creation
id: 2c76a22b-702d-48fd-8fa9-e41e2fe203b3
status: experimental
description: Detects the creation of files with the ".funksec" extension, which is appended to encrypted files by the FunkLocker ransomware.
references:
    - https://www.broadcom.com/support/security-center/protection-bulletin/funksec-ransomware
    - https://www.pcrisk.com/removal-guides/31853-funklocker-funksec-ransomware
author: Saiprashanth Pulisetti ( @Prashanthblogs)
date: 2025-08-08
tags:
    - attack.impact
    - attack.t1486
    - detection.emerging-threats
logsource:
    category: file_event
    product: windows
detection:
    selection:
        TargetFilename|endswith: '.funksec'
    condition: selection
falsepositives:
    - Unlikely
level: high

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