{
  "family": "silentinstall",
  "sample_count": 1,
  "category": "advanced_threat",
  "description": "<h3>Executive Summary</h3>\n\"SilentInstall\" (often flagged generically as Adware.SilentInstall or PUP.Installer) refers to a class of Potentially Unwanted Programs (PUPs) and aggressive software wrappers. These are designed to forcefully bundle and install multiple unwanted applications, toolbars, and adware extensions onto a user's system without their explicit consent or knowledge, hiding the installation process entirely from the user interface.\n\n<h3>Infection Vector and Technical Capabilities</h3>\nSilentInstall wrappers are the primary monetization method for \"freeware\" download portals and third-party software aggregators. When a user downloads a desired program (like a media player or PDF converter) from these sites, they are actually downloading the SilentInstall wrapper.\n\nUpon execution, the wrapper utilizes aggressive tactics:\n<ul>\n<li><strong>Hidden Execution (Command Line Switches):</strong> The wrapper extracts its payloads and executes them using Windows command-line switches (e.g., `/S`, `/silent`, `/quiet`). This forces the bundled adware and toolbars to install in the background without displaying any EULAs, progress bars, or opt-out checkboxes.</li>\n<li><strong>Registry and Browser Hijacking:</strong> The silently installed adware immediately begins modifying registry keys to establish persistence and forcefully alters the default homepage and search engine of installed browsers (Chrome, Firefox, Edge) to route traffic through affiliate links.</li>\n<li><strong>Evasion of UAC:</strong> Sophisticated variants may attempt to bypass Windows User Account Control (UAC) prompts to ensure the silent installations complete with administrative privileges.</li>\n</ul>\n\n<h3>Threat Assessment</h3>\nWhile technically not a virus, SilentInstall wrappers are highly disruptive. They rapidly degrade system performance by installing multiple resource-heavy adware programs simultaneously. They severely compromise user privacy through persistent browser hijacking and aggressive web tracking telemetry.\n\n<h3>Incident Response and Remediation</h3>\n<ul>\n<li><strong>Comprehensive System Scan:</strong> Standard antivirus often ignores PUPs. A dedicated enterprise anti-malware solution is required to scan the system and identify the dozens of potentially unwanted programs installed by the wrapper.</li>\n<li><strong>Manual Uninstallation and Cleanup:</strong> IT staff must manually review the \"Add/Remove Programs\" list, uninstalling the unwanted toolbars and optimizers. Further cleanup of orphaned registry keys and Scheduled Tasks is usually necessary.</li>\n<li><strong>Browser Factory Reset:</strong> To completely eradicate the browser hijacking components, all installed web browsers must undergo a full factory reset to purge hidden extensions and modified search settings.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "Adware.SilentInstall",
    "PUP.Installer",
    "Win32/Bundler"
  ],
  "enrichment_level": "insufficient_information",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1204.002",
    "T1562.001"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-07-02T07:08:57Z",
  "type": "Adware / PUP Installer",
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}