Drmsoft

Overview

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.

Understanding Drmsoft Adware
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.

Execution and Hijacking Mechanics
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.

Indicators of Compromise & Impact
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.

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to the MITRE ATT&CK framework:

Generated Detections (Boilerplate)

These YARA and Sigma rules are auto-generated based on the family name and aliases. They must be heavily tuned before deployment in a production environment.

YARA Rule

rule MALWARE_WIN_DRMSOFT {
    meta:
        description = "Detects Drmsoft (advanced_threat)"
        author = "SystemHelpdesk Boilerplate Generator"
        date = "2026-07-06"
    strings:
        $s1 = "drmsoft" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

Sigma Rule

title: Suspicious Drmsoft Activity
id: 7486b8a49dddd0e96f733cee521f82dc
status: experimental
description: Detects generic indicators of the drmsoft malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*drmsoft*"
    condition: selection
level: medium

Containment & Response Steps

Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.

1. Use the Windows Control Panel to thoroughly uninstall the media converter software and any other programs installed on the same date.
2. Audit Windows Group Policies and the Registry to remove any forced extension installation policies created by the adware.
3. Deploy an enterprise adware removal tool (e.g., AdwCleaner) to locate and strip the deeply embedded registry hooks and watchdog services.
4. Force a complete reset of all installed web browsers to factory defaults to eradicate the rogue extensions and restore the homepage.

What to Avoid

Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.

1. Do not rely solely on the browser's 'remove extension' button; Drmsoft frequently uses GPOs and watchdog services to immediately reinstall itself.
2. Avoid ignoring the infection; adware tracking data is highly detailed and may expose corporate activities or access to internal portals.

References & External Analysis

• Search "drmsoft" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: advanced_threat)

Explore other malware families in the same category:

• Smbd
• Autit
• Asktoolbar
• Chisburg
• Nicehashminer

Machine-readable

Get this profile as JSON: https://jordanricky1604-ship-it.github.io/malware-families-catalog/api/drmsoft.json

Ecosystem & Interactive Environments

This profile is part of the Malware Families Catalog, a public dataset of 2,899 malware families. The catalog is also published across our ecosystem: Hugging Face, Kaggle, Zenodo, Replit, StackBlitz, CodeSandbox, and CodePen.