{
  "family": "marketscore",
  "sample_count": 2,
  "category": "advanced_threat",
  "description": "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`).<br><br><b>Understanding Marketscore (Historical Spyware)</b><br>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.<br><br><b>Execution and Hijacking Mechanics</b><br>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.<br><br><b>Indicators of Compromise & Impact</b><br>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.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Marketscore and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "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."
      }
    },
    {
      "@type": "Question",
      "name": "How does Marketscore establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "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."
      }
    },
    {
      "@type": "Question",
      "name": "What are the essential incident response steps for mitigating a Marketscore compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "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."
      }
    },
    {
      "@type": "Question",
      "name": "What lateral movement and credential access tactics does Marketscore leverage in enterprise intrusions?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "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."
      }
    },
    {
      "@type": "Question",
      "name": "How does Marketscore maintain covert communications and evade perimeter network monitoring?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "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."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1112",
    "T1189",
    "T1547.001"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1112",
      "name": "Modify Registry (Modifying Winsock LSPs or proxy settings to intercept traffic)",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1547.001",
      "name": "Boot or Logon Autostart Execution: Registry Run Keys (Ensuring the proxy starts at boot)",
      "tactic": "Persistence"
    },
    {
      "id": "T1189",
      "name": "Drive-by Compromise (Distribution via deceptive software bundles)",
      "tactic": "Initial Access"
    }
  ],
  "containment_steps": [
    "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": [
    "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."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ],
  "attack_stage": [
    "execution",
    "persistence"
  ],
  "ecosystem": [
    "windows_pe"
  ],
  "is_emerging": false,
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows Server 2022",
    "Windows Server 2019"
  ]
}