{
  "family": "shandaadd",
  "sample_count": 9,
  "category": "advanced_threat",
  "description": "Adware:Win32/Shandaadd is a persistent adware framework and Potentially Unwanted Program (PUA) designed to silently hijack web browsers, inject intrusive advertisements, alter search results, and aggressively track user browsing habits to generate illicit pay-per-click revenue for its operators. It is often associated with localized, region-specific adware campaigns.<br><br><b>Understanding Shandaadd Adware</b><br>To an end-user, a Shandaadd infection is highly frustrating. Their web browsing experience is completely subverted: words on normal websites are turned into hyperlinked ads, massive banner ads appear everywhere, and their default search engine is locked to an unwanted portal. For security analysts, Shandaadd represents a classic Pay-Per-Install (PPI) monetization scheme, utilizing rootkit-like persistence to prevent easy removal.<br><br><b>Execution and Hijacking Mechanics</b><br>Shandaadd is heavily distributed via deceptive software bundlers (`T1189`) on third-party freeware sites. Upon execution, the installer uses 'Dark Patterns' to bypass user consent. It drops its payload into `C:\\Program Files` and establishes aggressive persistence via hidden Windows Services (`T1543.003`) and multiple Registry Run keys. It installs rogue Browser Helper Objects (BHOs) and extensions (`T1176`) to intercept all web traffic (`T1185`), injecting its advertisements directly into the DOM of the websites the user visits. Crucially, the watchdog service will immediately reinstall the browser extensions if the user attempts to delete them.<br><br><b>Indicators of Compromise & Impact</b><br>The primary impact is a severely degraded user experience, compromised browsing privacy (all searches are tracked and monetized), and wasted helpdesk resources. Incident responders will observe anomalous HTTP/HTTPS traffic to known adware affiliate networks (often routing through tracking domains). EDR logs will flag the installation of the Shandaadd service and the persistent hooking of the browser processes.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1543.003",
    "T1185",
    "T1189",
    "T1176"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1189",
      "name": "Drive-by Compromise (Bundled Installers)",
      "tactic": "Initial Access"
    },
    {
      "id": "T1176",
      "name": "Browser Extensions (BHO installation)",
      "tactic": "Persistence"
    },
    {
      "id": "T1543.003",
      "name": "Create or Modify System Process: Windows Service (Watchdog)",
      "tactic": "Persistence"
    },
    {
      "id": "T1185",
      "name": "Browser Session Hijacking (Ad injection)",
      "tactic": "Collection"
    }
  ],
  "containment_steps": [
    "Use the Windows Control Panel to attempt uninstallation, but be aware the uninstaller often leaves the core watchdog services intact.",
    "Deploy an enterprise adware removal tool (e.g., AdwCleaner or Malwarebytes) to locate and strip the deeply embedded registry hooks, BHOs, and Windows Services.",
    "Force a complete reset of all installed web browsers to factory defaults to eradicate the rogue extensions and restore the homepage.",
    "Quarantine the endpoint during cleanup to halt the active exfiltration of browsing telemetry."
  ],
  "what_to_avoid": [
    "Do not rely solely on the browser's 'remove extension' button; the underlying Shandaadd service will immediately reinstall the hijacker.",
    "Avoid ignoring the infection; adware tracking data is highly detailed and may expose corporate activities or provide a foothold for malvertising."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}