{
  "family": "appscience",
  "sample_count": 13,
  "category": "adware",
  "description": "AppScience (classified across security vendors as Adware:Win32/AppScience and PUA:Win32/AppScience) is an intrusive adware and telemetry collection software framework. Bundled with third-party software installers and utilities, AppScience installs persistent background processes that monitor user web browsing activities, collect application usage metrics, and inject targeted banner advertisements and affiliate links into web pages. It writes persistent autostart entries to HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run and registers scheduled tasks to ensure continuous execution.",
  "cta": "Published by the SystemHelpdesk Threat Intelligence Team.",
  "aliases": [
    "Adware:Win32/AppScience",
    "PUA:Win32/AppScience",
    "AppScience Adware",
    "Program:Win32/AppScience",
    "Win32/AppScience"
  ],
  "enrichment_level": "curated_sourced",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Adware:Win32/AppScience?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "AppScience is an adware application that monitors browsing activity and injects commercial advertisements into web pages."
      }
    },
    {
      "@type": "Question",
      "name": "How does AppScience get installed?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "It is bundled into freeware download managers and deceptive software installers without clear user disclosure."
      }
    },
    {
      "@type": "Question",
      "name": "What user data does AppScience collect?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "It logs visited website URLs, clicked links, application usage duration, and hardware telemetry."
      }
    },
    {
      "@type": "Question",
      "name": "How does AppScience survive system reboots?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "It writes autostart values to Windows Run registry keys and configures background scheduled tasks."
      }
    },
    {
      "@type": "Question",
      "name": "How can users remove AppScience?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Uninstall AppScience through Windows Apps & Features, delete residual files in %ProgramFiles%, and run an antimalware scan."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1176",
    "T1547.001",
    "T1053.005",
    "T1112",
    "T1071.001"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-10-15",
  "mitre_attack_detail": [
    {
      "id": "T1189",
      "name": "Drive-by Compromise",
      "tactic": "Initial Access"
    },
    {
      "id": "T1176",
      "name": "Browser Extensions",
      "tactic": "Persistence"
    },
    {
      "id": "T1112",
      "name": "Modify Registry",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1562.001",
      "name": "Impair Defenses: Disable or Modify Tools",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1105",
      "name": "Ingress Tool Transfer",
      "tactic": "Command and Control"
    }
  ],
  "containment_steps": [
    "Quarantine the endpoint to halt the active exfiltration of browsing telemetry and the downloading of further adware modules.",
    "Audit Windows Group Policies and the Registry to remove any forced extension installation policies created by the adware.",
    "Deploy an enterprise adware removal tool (e.g., AdwCleaner) to locate and strip the deeply embedded registry hooks and watchdog services.",
    "Force a complete reset of all installed web browsers to factory defaults to eradicate the rogue extensions and restore the homepage."
  ],
  "what_to_avoid": [
    "Do not rely solely on the browser's 'remove extension' button; Appscience frequently uses GPOs and watchdog services to immediately reinstall itself.",
    "Avoid ignoring the infection; adware tracking data is highly detailed and may expose corporate activities or access to internal portals."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ],
  "attack_stage": [
    "execution",
    "persistence"
  ],
  "ecosystem": [
    "windows_pe"
  ],
  "is_emerging": false,
  "sources": [
    {
      "name": "Microsoft Defender Threat Encyclopedia - Adware:Win32/AppScience",
      "url": "https://www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=Adware:Win32/AppScience"
    },
    {
      "name": "Malwarebytes Labs - PUP.Optional.AppScience Removal Guide",
      "url": "https://www.malwarebytes.com/blog/detections/pup-optional-appscience"
    },
    {
      "name": "MITRE ATT&CK - Browser Extensions (T1176)",
      "url": "https://attack.mitre.org/techniques/T1176/"
    }
  ],
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows 7"
  ]
}