{
  "family": "drmsoft",
  "sample_count": 10,
  "category": "advanced_threat",
  "description": "PUA:Win32/Drmsoft is a Potentially Unwanted Program (PUA) and adware family often bundled with video converters, media players, or software that promises to strip Digital Rights Management (DRM) from media files. While the core software may provide the promised media conversion, it heavily subsidizes its free cost by silently installing browser hijackers, aggressive tracking cookies, and injecting intrusive advertisements.<br><br><b>Understanding Drmsoft Adware</b><br>To an end-user, Drmsoft is highly annoying. They download a tool to convert a video file, and suddenly their browser homepage is changed, their default search engine is locked to an unfamiliar domain, and they are bombarded with pop-ups. For security analysts, Drmsoft represents a classic Pay-Per-Install (PPI) monetization scheme. It leverages deceptive installation tactics and aggressive persistence mechanisms to ensure the user cannot easily revert their browser settings.<br><br><b>Execution and Hijacking Mechanics</b><br>The infection typically begins when a user downloads the software from a freeware aggregator site (`T1189`). The setup wizard employs 'Dark Patterns'—pre-checked consent boxes hidden behind 'Advanced' menus (`T1204.002`). Upon execution, it installs malicious browser extensions (`T1176`) and frequently leverages Windows Group Policy (GPO) settings to lock the rogue extensions in place, preventing the user from removing them. It establishes persistence via Registry Run keys (`T1547.001`) and Scheduled Tasks to ensure the adware is reinstalled if deleted.<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 ad-tracking networks. EDR logs will show the initial installer attempting to modify browser preference files (e.g., Chrome's `Preferences` JSON file) and establishing unauthorized Group Policies.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Drmsoft and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Drmsoft 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 Drmsoft establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Drmsoft 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 Drmsoft compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Drmsoft 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 Drmsoft leverage in enterprise intrusions?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Drmsoft 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 Drmsoft maintain covert communications and evade perimeter network monitoring?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Drmsoft 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": [
    "T1562.001",
    "T1112",
    "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",
      "tactic": "Persistence"
    },
    {
      "id": "T1112",
      "name": "Modify Registry (Search Hijacking)",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1562.001",
      "name": "Impair Defenses: Disable or Modify Tools (GPO Abuse)",
      "tactic": "Defense Evasion"
    }
  ],
  "containment_steps": [
    "Use the Windows Control Panel to thoroughly uninstall the media converter software and any other programs installed on the same date.",
    "Audit Windows Group Policies and the Registry to remove any forced extension installation policies created by the adware.",
    "Deploy an enterprise adware removal tool (e.g., AdwCleaner) to locate and strip the deeply embedded registry hooks and watchdog services.",
    "Force a complete reset of all installed web browsers to factory defaults to eradicate the rogue extensions and restore the homepage."
  ],
  "what_to_avoid": [
    "Do not rely solely on the browser's 'remove extension' button; Drmsoft frequently uses GPOs and watchdog services to immediately reinstall itself.",
    "Avoid ignoring the infection; adware tracking data is highly detailed and may expose corporate activities or access to internal portals."
  ],
  "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"
  ]
}