Drmsoft
Table of Contents
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 our technical analysis hubs and the official MITRE ATT&CK framework:
| Technique | Name | Tactic | Official Spec |
|---|---|---|---|
T1189 | Drive-by Compromise (Bundled Installers) | Initial Access | ATT&CK ↗ |
T1176 | Browser Extensions | Persistence | ATT&CK ↗ |
T1112 | Modify Registry (Search Hijacking) | Defense Evasion | ATT&CK ↗ |
T1562.001 | Impair Defenses: Disable or Modify Tools (GPO Abuse) | Defense Evasion | ATT&CK ↗ |
MITRE D3FEND™ Defensive Countermeasures
Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):
| D3FEND ID | Countermeasure Name | Tactic | Countered ATT&CK | Defensive Guidance |
|---|---|---|---|---|
D3-RVM | Registry Value Modification Analysis | Detect | T1112 | Log Windows Event ID 4657 to monitor unauthorized modifications to system configuration and security settings. |
D3-BEA | Browser Extension Allowlisting | Harden | T1176 | Deploy enterprise browser policies via GPO or Intune to block unauthorized side-loaded extensions and add-ons. |
D3-RBI | Remote Browser Isolation | Isolate | T1189 | Execute untrusted web browsing sessions in disposable cloud containers to isolate drive-by exploits from local endpoints. |
D3-STA | Security Tool Anti-Tamper Enforcement | Harden | T1562.001 | Block unauthorized modification of antivirus registry flags and prevent stopping security agent services. |
Tiered Detection Rules (Cisco CAIRN Model)
Modern threat detection requires multi-layered rule engineering. We classify detections into three operational tiers based on signal fidelity:
Tier 1 Primitive Artifact Rule (Fast Triage)
Matches raw strings and file markers. Vulnerable to binary repacking and simple obfuscation.
rule MALWARE_WIN_DRMSOFT_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Drmsoft"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "drmsoft" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Tier 2 Behavioral Context Rule (Process Chains & Sigma)
Tracks parent-child process anomalies and suspicious scripting telemetry. Resilient against file renames.
title: SystemHelpDesk Detection - Drmsoft (Advanced Threat) Execution & Triage
id: 98fb8f19-0bbe-5f60-99a0-90f354aea225
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Drmsoft malware family. Detects proxy execution, reflective DLL loading,
and remote command injection associated with modular enterprise backdoors.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/drmsoft
- https://malware-families-catalog.systemhelpdesk.com/defensive/backdoor-rat-protection
- https://malware-families-catalog.systemhelpdesk.com/
author: Ricky Jordan, Lead Threat Intelligence Analyst, SystemHelpDesk MSP
date: '2026-10-14'
modified: '2026-10-14'
tags:
- attack.advanced-threat
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1562_001
- attack.t1112
- attack.t1189
- attack.t1176
logsource:
category: process_creation
product: windows
detection:
selection_process:
Image|endswith:
- \powershell.exe
- \cmd.exe
- \rundll32.exe
- \regsvr32.exe
CommandLine|contains:
- DownloadString
- IEX(
- '/s /n /u /i:'
- sc create
- start-process
condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: highTier 3 Attribution Fingerprint Rule (High Fidelity)
Deep signature matching distinctive operational fingerprints and payload characteristics.
rule MALWARE_WIN_DRMSOFT_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Drmsoft tradecraft"
tier = "T3 - Attribution Fingerprint"
confidence = "High (Confirmed Family Signature)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
// Core family identifier & heuristic payload signatures
$attrib_str = "drmsoft" ascii wide nocase
$pe_magic = "MZ" ascii
$net_marker = "http" ascii nocase
condition:
uint16(0) == 0x5a4d and ($attrib_str and $net_marker) and filesize < 15MB
}Containment & Response Steps
Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.
- 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
Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.
- 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.
References & External Analysis
- Search "drmsoft" on VirusTotal (External Analysis)
- Search "drmsoft" on Any.Run (Sandbox Sandbox)
- Search "drmsoft" on MalwareBazaar (Malware Samples)
Frequently Asked Questions
What is Drmsoft and what threat category does it belong to?
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.
How does Drmsoft establish persistence and evade defensive controls?
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.
What are the essential incident response steps for mitigating a Drmsoft compromise?
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.
What lateral movement and credential access tactics does Drmsoft leverage in enterprise intrusions?
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.
How does Drmsoft maintain covert communications and evade perimeter network monitoring?
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.
How do I remove Drmsoft from Windows?
Manual removal of Drmsoft is highly discouraged as it may leave persistence mechanisms intact. We recommend disconnecting the device from the internet and utilizing a professional incident response service or enterprise-grade EDR software to conduct a full forensic sweep.
What are the main symptoms of a Drmsoft infection?
Symptoms of Drmsoft can include unexpected system slowness, unauthorized outbound network traffic to unknown IP addresses, disabled security software, and suspicious background processes running from AppData or Temp directories.
Protect Your Network Against Advanced_Threats
Want to prevent Drmsoft and similar threats from compromising your organization? Read our comprehensive defensive guide: Think You've Been Hacked? What To Do First.
📣 Threat Intel Correction or Update?
Notice an outdated IOC, unlisted alias, or disputed attribution? Threat researchers are invited to propose an update on GitHub or contact the SystemHelpDesk research desk. All community revisions are credited in our public CHANGELOG.
Machine-readable
Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/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.