Kovter

Category: click_fraud · Aliases: Kovter · Sample count (EMBER 2018): 2,414 · Enrichment: curated_sourced · Updated: 2026-06-09
Category: Click_FraudActor: Unknown / CybercriminalIndustry: Global / OpportunisticMotivation: Opportunistic

Overview

Kovter is a malware family targeting Windows that, per Malwarebytes, has 'many faces' — its main variants are aimed at ad/click fraud and are hard to detect and remove because they use fileless infection methods. It usually arrives as a macro in a Word document email attachment; when the macro runs, it downloads a file that creates a PowerShell command stored in the Windows registry to gain persistence, after which the dropped file deletes itself. Over its history Kovter evolved through police-themed ransomware and downloader roles before becoming known for click fraud.

Known aliases

Threat reports may refer to this family under multiple names:

MITRE ATT&CK Techniques

This family has been observed using the following ATT&CK techniques: T1112 T1059.001 T1027.011 T1547.001 T1055

Tactical Mitigations

Based on the techniques used by this family, consider the following defensive strategies:

Generated Detections (Boilerplate)

These YARA and Sigma rules are auto-generated based on the family name and aliases. They must be heavily tuned before deployment in a production environment.

YARA Rule

rule MALWARE_WIN_KOVTER {
    meta:
        description = "Detects Kovter (click_fraud)"
        author = "SystemHelpdesk Boilerplate Generator"
        date = "2026-07-06"
    strings:
        $s1 = "kovter" ascii wide nocase
        $s2 = "kovter" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

Sigma Rule

title: Suspicious Kovter Activity
id: 6f91e55fc316078dad154e3fc2b92a4b
status: experimental
description: Detects generic indicators of the kovter malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*kovter*"
            - "*kovter*"
    condition: selection
level: medium

References & External Analysis

Frequently Asked Questions

What is Kovter?

A Windows malware family best known for ad/click fraud, notable for using fileless techniques that make it hard to detect and remove.

Why is Kovter called 'fileless'?

It stores its persistence mechanism as a PowerShell command in the Windows registry rather than as an ordinary file, and the dropped file deletes itself, leaving little on disk.

How does Kovter infect a machine?

It usually arrives as a macro inside a Word document email attachment; running the macro downloads and sets up the malware.

What does Kovter do?

Its main variants perform ad/click fraud; over time it has also been associated with ransomware and downloader behavior.

How can I protect against Kovter?

Disable Office macros from untrusted documents, be cautious with email attachments, and use reputable security software.

Where can I read an authoritative source on Kovter?

Malwarebytes maintains a Trojan.Kovter detection page, linked on this page.

How do I remove the Kovter Click_Fraud from Windows?

Manual removal of Kovter is highly discouraged as it may leave persistence mechanisms intact. We recommend disconnecting the device from the internet and utilizing a professional incident response service or enterprise-grade EDR software to conduct a full forensic sweep.

Is Kovter a virus or a Click_Fraud?

Kovter is classified as a Click_Fraud. Unlike traditional viruses that infect files, modern malware like Kovter typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.

What are the main symptoms of a Kovter infection?

Symptoms of Kovter can include unexpected system slowness, unauthorized outbound network traffic to unknown IP addresses, disabled security software, and suspicious background processes running from AppData or Temp directories.

Related Families (Category: click_fraud)

Explore other malware families in the same category:

Protect Your Network Against Click_Frauds

Want to prevent Kovter and similar threats from compromising your organization? Read our comprehensive defensive guide: Suspect an Infection? What to do.

Need help with an active incident? Published by the SystemHelpdesk team.

Machine-readable

Get this profile as JSON: https://jordan123234-malware-families-explorer.static.hf.space/api/kovter.json

Ecosystem & Interactive Environments

This profile is part of the Malware Families Catalog, a public dataset of 2,899 malware families. The catalog is also published across our ecosystem: Hugging Face, Kaggle, Zenodo, Replit, StackBlitz, CodeSandbox, and CodePen.