Forcestartpage
Table of Contents
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 our technical analysis hubs and the official MITRE ATT&CK framework:
| Technique | Name | Tactic | Official Spec |
|---|---|---|---|
T1562.001 | Impair Defenses: Disable or Modify Tools (Hijacking search/homepage settings) | Defense Evasion | ATT&CK ↗ |
T1189 | Drive-by Compromise (Software bundling) | Initial Access | ATT&CK ↗ |
T1547.009 | Boot or Logon Autostart Execution: Shortcut Modification (Appending URLs to browser shortcuts) | Persistence | ATT&CK ↗ |
T1176 | Browser Extensions (Installing malicious extensions) | Persistence | ATT&CK ↗ |
MITRE D3FEND™ Defensive Countermeasures
Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):
| D3FEND ID | Countermeasure Name | Tactic | Countered ATT&CK | Defensive Guidance |
|---|---|---|---|---|
D3-BEA | Browser Extension Allowlisting | Harden | T1176 | Deploy enterprise browser policies via GPO or Intune to block unauthorized side-loaded extensions and add-ons. |
D3-RBI | Remote Browser Isolation | Isolate | T1189 | Execute untrusted web browsing sessions in disposable cloud containers to isolate drive-by exploits from local endpoints. |
D3-RPM | Registry Persistence Monitoring | Detect | T1547.009 | Monitor changes to standard autostart run keys (HKLM\Software\Microsoft\Windows\CurrentVersion\Run) and Startup folders. |
D3-STA | Security Tool Anti-Tamper Enforcement | Harden | T1562.001 | Block unauthorized modification of antivirus registry flags and prevent stopping security agent services. |
Tiered Detection Rules (Cisco CAIRN Model)
Modern threat detection requires multi-layered rule engineering. We classify detections into three operational tiers based on signal fidelity:
Tier 1 Primitive Artifact Rule (Fast Triage)
Matches raw strings and file markers. Vulnerable to binary repacking and simple obfuscation.
rule MALWARE_WIN_FORCESTARTPAGE_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Forcestartpage"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "forcestartpage" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Tier 2 Behavioral Context Rule (Process Chains & Sigma)
Tracks parent-child process anomalies and suspicious scripting telemetry. Resilient against file renames.
title: SystemHelpDesk Detection - Forcestartpage (Advanced Threat) Execution & Triage
id: 0cbd3a88-e51e-5189-82ee-08f8bcb81052
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Forcestartpage malware family. Detects proxy execution, reflective DLL
loading, and remote command injection associated with modular enterprise backdoors.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/forcestartpage
- https://malware-families-catalog.systemhelpdesk.com/defensive/backdoor-rat-protection
- https://malware-families-catalog.systemhelpdesk.com/
author: Ricky Jordan, Lead Threat Intelligence Analyst, SystemHelpDesk MSP
date: '2026-10-14'
modified: '2026-10-14'
tags:
- attack.advanced-threat
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1189
- attack.t1176
- attack.t1562_001
- attack.t1547_009
logsource:
category: process_creation
product: windows
detection:
selection_process:
Image|endswith:
- \powershell.exe
- \cmd.exe
- \rundll32.exe
- \regsvr32.exe
CommandLine|contains:
- DownloadString
- IEX(
- '/s /n /u /i:'
- sc create
- start-process
condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: highTier 3 Attribution Fingerprint Rule (High Fidelity)
Deep signature matching distinctive operational fingerprints and payload characteristics.
rule MALWARE_WIN_FORCESTARTPAGE_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Forcestartpage tradecraft"
tier = "T3 - Attribution Fingerprint"
confidence = "High (Confirmed Family Signature)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
// Core family identifier & heuristic payload signatures
$attrib_str = "forcestartpage" ascii wide nocase
$pe_magic = "MZ" ascii
$net_marker = "http" ascii nocase
condition:
uint16(0) == 0x5a4d and ($attrib_str and $net_marker) and filesize < 15MB
}Containment & Response Steps
Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.
- Use the Windows Control Panel to uninstall the adware application and any other unknown software installed on the same date.
- Run a specialized enterprise adware removal tool (such as Malwarebytes) to eradicate the background services enforcing the persistence.
- Inspect all browser shortcut icons (on the Desktop and Taskbar) and remove any malicious URLs appended to the 'Target' field.
- 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.
- 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.
- 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)
- Search "forcestartpage" on Any.Run (Sandbox Sandbox)
- Search "forcestartpage" on MalwareBazaar (Malware Samples)
Frequently Asked Questions
What is Forcestartpage and what threat category does it belong to?
Forcestartpage is classified as a Advanced Threat. Documented across security telemetry, it is engineered to execute unauthorized operations, establish persistent footholds on target endpoints, and facilitate malicious campaigns targeting enterprise and individual environments.
How does Forcestartpage establish persistence and evade defensive controls?
Forcestartpage typically establishes persistence through registry run keys, scheduled tasks, or service installations, while evading signature-based antivirus solutions through code obfuscation, memory injection, or anti-analysis sandbox checks.
What are the essential incident response steps for mitigating a Forcestartpage compromise?
Security teams responding to Forcestartpage should immediately isolate affected endpoints from the network, perform memory triage to capture volatile forensic artifacts, audit registry and startup persistence mechanisms, revoke exposed user credentials, and restore systems from verified, clean backups.
What lateral movement and credential access tactics does Forcestartpage leverage in enterprise intrusions?
Forcestartpage frequently utilizes privileged account harvesting techniques such as LSASS memory dumping, Kerberoasting, and token impersonation to escalate privileges. Once administrative credentials are acquired, it pivots across the victim network utilizing living-off-the-land binaries (LOLBins) such as WMI, PowerShell remoting, and PsExec, or abuses remote desktop protocols (RDP) to reach critical internal repositories and domain controllers.
How does Forcestartpage maintain covert communications and evade perimeter network monitoring?
Forcestartpage often relies on multi-stage command and control (C2) architectures utilizing encrypted protocols over standard web ports (HTTPS/443 or DNS tunneling) to blend in with legitimate enterprise network traffic. Many variants incorporate proxy networks, domain fronting, or cloud services (such as Microsoft Graph API, Google Drive, or Telegram) to masquerade C2 channels, bypassing traditional signature-based egress filtering.
How do I remove Forcestartpage from Windows?
Manual removal of Forcestartpage 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.
What are the main symptoms of a Forcestartpage infection?
Symptoms of Forcestartpage 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.
Protect Your Network Against Advanced_Threats
Want to prevent Forcestartpage and similar threats from compromising your organization? Read our comprehensive defensive guide: Think You've Been Hacked? What To Do First.
📣 Threat Intel Correction or Update?
Notice an outdated IOC, unlisted alias, or disputed attribution? Threat researchers are invited to propose an update on GitHub or contact the SystemHelpDesk research desk. All community revisions are credited in our public CHANGELOG.
Machine-readable
Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/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.