Opendownloadmanager

Overview

Adware:Win32/Opendownloadmanager is a widespread Potentially Unwanted Program (PUA) and adware bundler framework. It is designed to act as an aggressive installer wrapper that delivers a payload of legitimate freeware alongside multiple, hidden adware applications, browser hijackers, and tracking cookies.

Understanding Opendownloadmanager
To an end-user, Opendownloadmanager simply looks like the setup wizard for a free program they intentionally downloaded (like a PDF converter or a game). However, the wizard is heavily laden with 'Dark Patterns'—pre-checked consent boxes hidden under 'Advanced' settings. For security analysts, Opendownloadmanager is a primary delivery mechanism for the Pay-Per-Install (PPI) adware ecosystem. The creator of the wrapper gets paid by various adware vendors for every machine they successfully infect.

Execution and Bundling Mechanics
The user initiates the infection by running the downloaded installer (`T1204.002`). Opendownloadmanager immediately reaches out to a remote C2 server to fetch the latest list of 'offers' (adware payloads) tailored to the user's geolocation (`T1105`). If the user rapidly clicks 'Next' through the installation, it silently drops and executes multiple secondary MSIs or EXEs (`T1059.004`). These secondary payloads typically install rogue browser extensions (`T1176`), modify the browser's default search engine (`T1112`), and establish persistence via Scheduled Tasks to ensure the adware is reinstalled if removed.

Indicators of Compromise & Impact
The immediate impact is a severely degraded browsing experience, characterized by pop-up ads, redirected searches, and sluggish system performance. Incident responders will observe a sudden spike in DNS requests to known adware domains immediately following the execution of a newly downloaded installer. EDR logs will flag the original installer process spawning multiple child processes (the adware droppers) that subsequently modify browser preference files and Registry run keys.

MITRE ATT&CK Techniques

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

Tactical Mitigations

Based on the techniques used by this family, consider the following defensive strategies:

• T1059.004: Restrict execution of scripting languages such as PowerShell, VBScript, or Python to authorized administrators. Enforce Script Block Logging.
• T1105: Implement network intrusion detection systems (NIDS) and host-based firewalls to block unauthorized inbound or outbound file transfers.

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

Sigma Rule

title: Suspicious Opendownloadmanager Activity
id: c125b0708840ead538f16df33dae8008
status: experimental
description: Detects generic indicators of the opendownloadmanager malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*opendownloadmanager*"
    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 systematically identify and uninstall all recently added programs, focusing on toolbars and 'search protectors'.
2. Deploy an enterprise adware removal tool (e.g., AdwCleaner) to strip the deeply embedded Scheduled Tasks and registry hooks left behind by the adware framework.
3. Force a complete reset of all installed web browsers (Chrome, Edge, Firefox) to factory defaults to eradicate rogue extensions and restore the homepage.
4. Quarantine the original installer file to prevent further execution.

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 manual uninstallation via the Control Panel; the payloads frequently use watchdog services to immediately reinstall themselves.
2. Avoid ignoring the infection; adware tracking data is highly detailed and may expose corporate activities or provide a foothold for more severe malvertising attacks.

References & External Analysis

• Search "opendownloadmanager" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: advanced_threat)

Explore other malware families in the same category:

• Molebox
• Prast
• Fontra
• Baidusearch
• Bhoint

Machine-readable

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