Marketscore
Table of Contents
Overview
Adware:Win32/Marketscore (also known historically as NetSetter) is a highly intrusive piece of adware/spyware that operates by fundamentally altering the victim's network configuration. Ostensibly marketed as 'market research' software that users 'agreed' to install in exchange for free software, Marketscore intercepts all web traffic to monitor browsing habits and inject targeted advertising, acting as a local Man-in-the-Middle (MitM) (`T1112`).
Understanding Marketscore (Historical Spyware)
To an end-user, Marketscore often caused significant network instability, slow browsing speeds, and a deluge of pop-up ads. For a security professional, it represents a severe privacy violation and a compromise of the network stack. Marketscore is infamous for its aggressive tactics and the difficulty of its removal, establishing the template for many modern, aggressive adware families.
Execution and Hijacking Mechanics
Marketscore was typically distributed via software bundles (e.g., attached to screensavers or early P2P clients). Upon installation, it required administrative privileges to deeply embed itself into the Windows networking stack. It commonly modified Winsock LSPs (Layered Service Providers) or installed a local proxy server, routing all HTTP/HTTPS traffic through its own engine (`T1112`). It modified the Windows Registry to ensure it started before the browser (`T1547.001`). Because it intercepted traffic at the network layer, it could monitor encrypted communications (by presenting its own SSL certificates) and inject ads into any page, regardless of the browser used.
Indicators of Compromise & Impact
The impact is the total loss of web browsing privacy and severe degradation of system performance. Host-based IoCs include the presence of Marketscore/NetSetter executables in `%ProgramFiles%`, the modification of `HKLM\System\CurrentControlSet\Services\WinSock2\Parameters\Protocol_Catalog9`, and the presence of unexpected local proxy settings in the Internet Options control panel. Network IoCs involve all web traffic being routed through unexpected local ports or directly to Marketscore's data collection servers.
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 |
|---|---|---|---|
T1112 | Modify Registry (Modifying Winsock LSPs or proxy settings to intercept traffic) | Defense Evasion | ATT&CK ↗ |
T1547.001 | Boot or Logon Autostart Execution: Registry Run Keys (Ensuring the proxy starts at boot) | Persistence | ATT&CK ↗ |
T1189 | Drive-by Compromise (Distribution via deceptive software bundles) | Initial Access | 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-RVM | Registry Value Modification Analysis | Detect | T1112 | Log Windows Event ID 4657 to monitor unauthorized modifications to system configuration and security settings. |
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 | T1547.001 | Audit and restrict write privileges to user and machine-level Registry Run/RunOnce keys using Endpoint Privilege Management. |
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_MARKETSCORE_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Marketscore"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "marketscore" 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 - Marketscore (Advanced Threat) Execution & Triage
id: 327eb02a-cc6c-51c2-bad3-1c220ea95bee
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Marketscore 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/marketscore
- 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.t1112
- attack.t1189
- attack.t1547_001
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_MARKETSCORE_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Marketscore 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 = "marketscore" 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 a specialized anti-malware tool; manual removal of Marketscore can break the Windows networking stack (Winsock) entirely.
- If internet connectivity is broken after removal, use the `netsh winsock reset` command from an elevated command prompt to restore the default networking configuration.
- Verify that all local proxy settings (`inetcpl.cpl` -> Connections -> LAN settings) have been cleared.
- Reset all web browsers to their default configurations to ensure no malicious extensions or start pages remain.
What to Avoid
Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.
- Do not simply delete the Marketscore executable files without properly unregistering the LSPs or proxies, as this will immediately kill the machine's internet connection.
- Avoid accepting 'free' software offers that require you to join a 'research panel', as this is the primary vector for this type of spyware.
References & External Analysis
- Search "marketscore" on VirusTotal (External Analysis)
- Search "marketscore" on Any.Run (Sandbox Sandbox)
- Search "marketscore" on MalwareBazaar (Malware Samples)
Frequently Asked Questions
What is Marketscore and what threat category does it belong to?
Marketscore 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 Marketscore establish persistence and evade defensive controls?
Marketscore 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 Marketscore compromise?
Security teams responding to Marketscore 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 Marketscore leverage in enterprise intrusions?
Marketscore 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 Marketscore maintain covert communications and evade perimeter network monitoring?
Marketscore 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 the Marketscore Advanced_Threat from Windows?
Manual removal of Marketscore 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 Marketscore a virus or a Advanced_Threat?
Marketscore is classified as a Advanced_Threat. Unlike traditional viruses that infect files, modern malware like Marketscore typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Marketscore infection?
Symptoms of Marketscore 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 Marketscore 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/marketscore.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.