Funmood
Overview
Executive Summary
Funmood (often seen as Funmoods Toolbar) is a highly prevalent family of Potentially Unwanted Programs (PUPs) and aggressive Browser Hijackers. Originally marketed as a fun utility providing custom emojis, cursor themes, and wallpapers, its true objective is to forcefully take over the user's web browsers, redirecting all search traffic to affiliate networks to generate illicit ad revenue and harvesting user telemetry.Distribution and Technical Behavior
Funmood was notoriously distributed via aggressive software bundling. It was frequently hidden within "free" software installers, screensavers, or disguised as a necessary plugin update on untrustworthy download portals. Once executed, Funmood deeply integrates with installed web browsers:- Browser Hijacking: Funmood replaces the browser's default search engine, homepage, and new tab settings (typically routing traffic through `search.funmoods.com`). This redirection allows the operators to intercept queries and serve heavily sponsored, often deceptive, search results.
- Toolbar/BHO Installation: The software installs a visible toolbar or a hidden Browser Helper Object (BHO) in Internet Explorer and extensions in Chrome/Firefox. These components track the user's browsing history and inject disruptive banner ads and pop-ups into legitimate websites.
- Persistence: Funmood utilizes Windows Registry modifications to ensure its toolbar is loaded every time the browser starts, and it actively resists user attempts to change the homepage back to its default state.
Risk Assessment
While Funmood does not actively encrypt files or steal banking credentials, it introduces massive operational friction and severely degrades the user experience. The constant tracking of search habits presents a privacy risk, and the injected advertisements are frequently served by low-reputation networks, increasing the likelihood of "malvertising" attacks.Mitigation and Removal Strategies
- Endpoint Scanning: Utilize a reputable enterprise-grade anti-malware solution to perform a system scan, targeting the Funmood executables and persistent registry keys used to maintain its hold on the browser.
- Browser Remediation: Manually inspect and remove the Funmoods extension/toolbar from all installed web browsers. Perform a complete factory reset of the browsers to clear the hijacked search settings and BHOs.
- Application Control: Enforce strict application whitelisting policies to prevent standard users from executing unapproved "customization" software that is the primary vector for this hijacker.
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: T1566.002 T1176 T1112 T1547.009
Tactical Mitigations
Based on the techniques used by this family, consider the following defensive strategies:
- T1566.002: Inspect email links for known malicious domains and use link-rewriting services for time-of-click analysis.
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_FUNMOOD {
meta:
description = "Detects Funmood (advanced_threat)"
author = "SystemHelpdesk Boilerplate Generator"
date = "2026-07-06"
strings:
$s1 = "funmood" ascii wide nocase
$s2 = "adware.funmoods" ascii wide nocase
$s3 = "pup.funmood" ascii wide nocase
$s4 = "browsermodifier:win32/funmoods" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Sigma Rule
title: Suspicious Funmood Activity
id: 24bfa620e7a26f341ec607e1c92f65a0
status: experimental
description: Detects generic indicators of the funmood malware family.
logsource:
category: process_creation
product: windows
detection:
selection:
Image|endswith:
- '\cmd.exe'
- '\powershell.exe'
CommandLine|contains:
- "*funmood*"
- "*adware.funmoods*"
- "*pup.funmood*"
- "*browsermodifier:win32/funmoods*"
condition: selection
level: mediumReferences & External Analysis
- Search "funmood" on VirusTotal (External Analysis)
Frequently Asked Questions
How do I remove the Funmood Advanced_Threat from Windows?
Manual removal of Funmood 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 Funmood a virus or a Advanced_Threat?
Funmood is classified as a Advanced_Threat. Unlike traditional viruses that infect files, modern malware like Funmood typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Funmood infection?
Symptoms of Funmood 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: advanced_threat)
Explore other malware families in the same category:
Protect Your Network Against Advanced_Threats
Want to prevent Funmood and similar threats from compromising your organization? Read our comprehensive defensive guide: Suspect an Infection? What to do.
Machine-readable
Get this profile as JSON: https://jordanricky1604-ship-it.github.io/malware-families-catalog/api/funmood.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.