{
  "family": "openshopper",
  "sample_count": 2,
  "category": "advanced_threat",
  "description": "Adware:Win32/Openshopper is a highly persistent adware framework and browser hijacker designed to inject unsolicited advertisements, fake coupons, and sponsored links directly into the user's web browsing experience (`T1189`). While marketed as a 'shopping assistant' or browser extension, its primary function is to intercept web traffic and monetize the user's behavior without their informed consent.<br><br><b>Understanding Openshopper</b><br>To an end-user, Openshopper manifests as a significant degradation of the web experience. Every e-commerce site visited will be overlaid with 'Compare Prices!' boxes, text links will be hyperlinked to third-party domains, and the default search engine is invariably changed. For a security team, it represents a risk to data privacy and a potential vector for more severe malvertising attacks, as the infrastructure serving the ads is often poorly secured.<br><br><b>Execution and Hijacking Mechanics</b><br>Openshopper is almost exclusively distributed via Software Bundling (`T1189`)—attached to free software downloads, fake Flash updates, or pirated media. Upon execution, it installs itself as a Windows Service or Scheduled Task to ensure persistence (`T1543.003`). It then forcibly installs extensions into Chrome, Firefox, and Edge. To protect these extensions from being easily uninstalled by the user, Openshopper often modifies the Windows Registry (e.g., setting 'ForceInstall' Chrome policies) (`T1562.001`), locking the extension into the browser.<br><br><b>Indicators of Compromise & Impact</b><br>The primary impact is the unauthorized monetization of user data and exposure to malicious advertising. Host-based IoCs include registry modifications in `HKLM\\Software\\Policies\\Google\\Chrome\\ExtensionInstallForcelist`, the presence of unexpected scheduled tasks updating browser extensions, and unusual executables running from `%ProgramFiles%` or `%LocalAppData%` mimicking legitimate software names. Network IoCs include a massive volume of background HTTP/HTTPS requests to advertising and tracking domains whenever a browser is open.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Openshopper and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Openshopper 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 Openshopper establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Openshopper 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 Openshopper compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Openshopper 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 Openshopper leverage in enterprise intrusions?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Openshopper 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 Openshopper maintain covert communications and evade perimeter network monitoring?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Openshopper 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": [
    "T1189",
    "T1562.001",
    "T1543.003"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1189",
      "name": "Drive-by Compromise (Initial distribution via deceptive software bundles)",
      "tactic": "Initial Access"
    },
    {
      "id": "T1562.001",
      "name": "Impair Defenses: Disable or Modify Tools (Modifying browser policies to prevent adware removal)",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1543.003",
      "name": "Create or Modify System Process: Windows Service (Establishing persistent adware updaters)",
      "tactic": "Persistence"
    }
  ],
  "containment_steps": [
    "Use an enterprise-grade Adware/Malware removal tool to identify and strip out the persistent registry keys and services protecting the adware.",
    "Manually inspect and remove any forced browser policies (`chrome://policy` or `edge://policy`) that prevent extension removal.",
    "Reset all installed web browsers to their default, factory settings to clear out hijacked search engines and proxy configurations.",
    "Implement endpoint application control to block the execution of common, known adware installers from user directories."
  ],
  "what_to_avoid": [
    "Do not rely solely on the browser's 'Uninstall Extension' button; Openshopper's background service will simply reinstall it.",
    "Avoid downloading 'free' software from third-party download portals, as they are the primary distribution vector for bundled adware."
  ],
  "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"
  ]
}