{
  "family": "rubar",
  "sample_count": 2,
  "category": "advanced_threat",
  "description": "Adware:Win32/Rubar is an intrusive Potentially Unwanted Program (PUP) categorized as a malicious Browser Modifier or Hijacker. It is designed to forcibly alter a user's web browsing experience across multiple browsers (Chrome, Firefox, Edge) to inject unwanted advertisements, redirect search traffic, and track browsing behavior to generate illicit Pay-Per-Click (PPC) revenue.<br><br><b>Understanding Rubar</b><br>To an end-user, Rubar manifests as a sudden influx of unremovable toolbars, persistent pop-up ads, and the forced redirection of their default search engine to a low-quality, third-party portal (often designed to look like Google or Bing but filled with sponsored links). For a security team, it represents a breakdown in endpoint hygiene and a potential vector for more serious infections via malvertising (`T1189`).<br><br><b>Execution and Hijacking Mechanics</b><br>Rubar is typically distributed via deceptive software bundles (wrappers) or fake software updates (like Adobe Flash or Java). Upon execution, it modifies the Windows Registry (`T1112`) and browser configuration files (`T1176`) to force-install malicious extensions or change the default homepage and search provider. To ensure the hijacking cannot be easily reversed by the user, Rubar frequently alters the shortcut properties (the `.lnk` files) of installed browsers on the Desktop and Taskbar, appending a malicious URL to the target path so the hijacked site loads every time the browser is launched.<br><br><b>Indicators of Compromise & Impact</b><br>The impact is a severely degraded user experience, potential privacy violations (tracking of search queries), and exposure to potentially malicious ads. Host-based IoCs include EDR alerts for modifications to browser shortcut properties, unexpected additions to browser Extension directories, or the presence of anomalous registry keys modifying `Start Page` or `Default_Search_URL` values. Network IoCs include DNS queries resolving to known adware tracking infrastructure.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1546.015",
    "T1112",
    "T1176"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1176",
      "name": "Browser Extensions (Force-installing the malicious extension)",
      "tactic": "Persistence"
    },
    {
      "id": "T1112",
      "name": "Modify Registry (Changing default search/homepage keys)",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1546.015",
      "name": "Event Triggered Execution: Component Object Model Hijacking (Modifying browser shortcuts)",
      "tactic": "Persistence"
    }
  ],
  "containment_steps": [
    "Inspect the 'Target' properties of all web browser shortcuts (Desktop, Taskbar, Start Menu) and remove any appended URLs.",
    "Use the Windows Control Panel to uninstall the explicitly named adware program and the freeware application that originally bundled it.",
    "Manually remove the malicious extension folder from the browser's AppData directory and reset the browser to default settings.",
    "Run a thorough scan with an enterprise-grade Adware/PUA removal tool to clean up deep registry persistence mechanisms."
  ],
  "what_to_avoid": [
    "Do not simply change the homepage back manually in the browser settings; the modified shortcut will revert it on the next launch.",
    "Avoid allowing users to download software or browser extensions from unverified third-party portals."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}