{
  "family": "mediamine",
  "sample_count": 1,
  "category": "ransomware",
  "description": "Adware:Win32/Mediamine is a highly intrusive adware family designed to hijack the user's web browsing experience. Its primary goal is monetization through forced ad impressions and affiliate link redirection. Mediamine specifically targets the browser's core components, injecting advertisements directly into web pages and altering default search settings without user consent (`T1189`).<br><br><b>Understanding Mediamine (Browser Hijacking)</b><br>To an end-user, Mediamine makes the internet nearly unusable. Legitimate search results are replaced with sponsored links, random text on web pages is turned into hyperlinks, and large banner ads obscure actual content. For an IT department, Mediamine is a security risk because the adware networks it uses are often compromised, serving as vectors for more severe malware like ransomware or credential stealers (malvertising).<br><br><b>Execution and Hijacking Mechanics</b><br>Mediamine is typically distributed via pay-per-install (PPI) networks, bundled with freeware or deceptive 'update' prompts. Upon execution, it installs itself as a Windows Service or Scheduled Task to ensure persistence (`T1543.003`). It then drops malicious extensions into Chrome, Edge, and Firefox. To prevent easy removal, Mediamine often modifies the Windows Registry (specifically the `ExtensionInstallForcelist` policies for Chrome/Edge) (`T1562.001`), locking the extension so the user cannot uninstall it via the browser UI.<br><br><b>Indicators of Compromise & Impact</b><br>The primary impact is the unauthorized monetization of user data and exposure to secondary malware. Host-based IoCs include the presence of unexpected browser extensions (often with random alphanumeric IDs), unauthorized modifications to browser policy registry keys (`HKLM\\Software\\Policies\\Google\\Chrome`), and unexpected executables running from `%LocalAppData%`. Network IoCs involve constant, high-volume background HTTP/HTTPS requests to known advertising networks and tracking domains.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1543.003",
    "T1189",
    "T1562.001"
  ],
  "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 a specialized Adware/Malware removal tool to identify and strip out the persistent registry keys and services protecting Mediamine.",
    "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; Mediamine'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"
  ]
}