Forcestartpage

Overview

BrowserModifier:Win32/Forcestartpage is a generic classification for aggressive Potentially Unwanted Programs (PUAs) functioning as **Browser Hijackers**. Its primary objective is to silently modify the settings of installed web browsers (Chrome, Firefox, Edge) without user consent, forcibly changing the default homepage, new tab page, and default search engine to point to monetized, affiliate-controlled domains or adware networks.

Understanding Browser Hijackers
To an end-user, Forcestartpage manifests as severe frustration: every time they open their browser or search for something, they are redirected to an unfamiliar, ad-heavy search portal (like Yahoo Search provided by a shady third party, or a completely fake search engine). For an enterprise, it represents a security risk because the hijacked search results are completely unvetted and often prioritize links to tech support scams or malware exploit kits. It also allows for the unauthorized tracking of all user search queries.

Execution and Hijacking Mechanics
Forcestartpage is almost exclusively distributed via deceptive software bundling (`T1189`), secretly attached to the installers of legitimate freeware downloaded from untrusted sources. During installation (`T1204.002`), it installs itself as a malicious browser extension or modifies the browser's shortcut properties directly (appending a URL to the target path) (`T1547`). It forcibly modifies the browser's preferences (`T1562.001`) to point to its own monetization portals. To maintain persistence, it often employs a background Windows service or Scheduled Task that constantly monitors the browser settings, immediately reverting them back to the hijacked state if the user attempts to manually fix them.

Indicators of Compromise & Impact
The primary impact is privacy violation (search tracking) and severe disruption of the user's workflow. IoCs include EDR alerts for unknown processes modifying browser preference files (e.g., Chrome's `Preferences` JSON file) or altering the properties of `.lnk` shortcut files on the Desktop. The user will report being unable to change their homepage back to Google or Bing. Network logs will show all search queries being routed through unknown tracking domains before reaching a search engine.

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to the MITRE ATT&CK framework:

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_FORCESTARTPAGE {
    meta:
        description = "Detects Forcestartpage (advanced_threat)"
        author = "SystemHelpdesk Boilerplate Generator"
        date = "2026-07-06"
    strings:
        $s1 = "forcestartpage" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

Sigma Rule

title: Suspicious Forcestartpage Activity
id: 1422c87ae13d0f3edaa5aeaea40e45a8
status: experimental
description: Detects generic indicators of the forcestartpage malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*forcestartpage*"
    condition: selection
level: medium

Containment & Response Steps

Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.

1. Use the Windows Control Panel to uninstall the adware application and any other unknown software installed on the same date.
2. Run a specialized enterprise adware removal tool (such as Malwarebytes) to eradicate the background services enforcing the persistence.
3. Inspect all browser shortcut icons (on the Desktop and Taskbar) and remove any malicious URLs appended to the 'Target' field.
4. Force a complete reset of all installed web browsers (Chrome, Edge, Firefox) to their factory defaults to clear hijacked settings and hidden extensions.

What to Avoid

Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.

1. Avoid relying solely on removing the browser extension via the browser's UI, as the persistent updater process will simply reinstall it on the next reboot.
2. Do not ignore the risk; hijacked search results are a primary vector for tricking users into downloading more severe malware.

References & External Analysis

• Search "forcestartpage" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: advanced_threat)

Explore other malware families in the same category:

• Webaltatoolbar
• Mirai
• Taterf
• Snipr
• Zapchast

Machine-readable

Get this profile as JSON: https://jordanricky1604-ship-it.github.io/malware-families-catalog/api/forcestartpage.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.