Ytddownloader

Overview

YTD Downloader (commonly cataloged across endpoint security vendors under signatures including PUA:Win32/YTDDownloader, SoftwareBundler:Win32/YTDVideoDownloader, and PUP.Optional.YTDDownloader) is a widely distributed potentially unwanted application (PUA) and software bundler marketed as a video downloading utility. Propagated through third-party download directories, aggressive search redirect ads, and misleading installation wrappers, YTD Downloader bundles extraneous commercial software components, browser modifiers, and adware plugins without explicit, clear user disclosure. Once deployed onto a Windows system, the program establishes persistence by configuring startup registry run keys under HKCU\Software\Microsoft\Windows\CurrentVersion\Run and scheduling background maintenance tasks. It frequently generates disruptive pop-up advertisements prompting users to purchase commercial Pro licenses, injects affiliate links and banner advertisements into active browsing sessions, and may redirect default search queries to partner advertising portals.

Known aliases

Threat reports may refer to this family under multiple names:

• PUA:Win32/YTDDownloader
• SoftwareBundler:Win32/YTDVideoDownloader
• PUP.Optional.YTDDownloader
• Adware:Win32/YTDDownloader
• Win32/YTDVideoDownloader

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to our technical analysis hubs and the official MITRE ATT&CK framework:

Tactical Mitigations

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

• T1071.001: Implement web filtering and SSL/TLS inspection to detect malicious command and control (C2) traffic hiding in HTTP/HTTPS.

MITRE D3FEND™ Defensive Countermeasures

Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):

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:

rule MALWARE_WIN_YTDDOWNLOADER_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Ytddownloader"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "ytddownloader" ascii wide nocase
        $s2 = "pua:win32/ytddownloader" ascii wide nocase
        $s3 = "softwarebundler:win32/ytdvideodownloader" ascii wide nocase
        $s4 = "pup.optional.ytddownloader" ascii wide nocase
        $s5 = "adware:win32/ytddownloader" ascii wide nocase
        $s6 = "win32/ytdvideodownloader" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Ytddownloader (Pua) Execution & Triage
id: af35c166-1960-52d8-9c71-08ad00ee1a97
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Ytddownloader malware family. Detects suspicious execution from temporary
  user directories with hidden window flags and background transfer utilities.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/ytddownloader
- https://malware-families-catalog.systemhelpdesk.com/defensive/ransomware-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.pua
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1189
- attack.t1547_001
- attack.t1053_005
- attack.t1112
- attack.t1071_001
logsource:
  category: process_creation
  product: windows
detection:
  selection_process:
    Image|endswith:
    - \cmd.exe
    - \powershell.exe
    - \cscript.exe
    - \wscript.exe
    CommandLine|contains:
    - AppData\Local\Temp
    - -WindowStyle Hidden
    - /e:jscript
    - bitsadmin /transfer
  condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: medium

rule MALWARE_WIN_YTDDOWNLOADER_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Ytddownloader 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 = "ytddownloader" 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.

1. Terminate active YTD Downloader processes and background updater services via Task Manager.
2. Uninstall YTD Video Downloader through Windows Settings or Programs and Features.
3. Audit scheduled tasks and remove entries related to YTD background updates.
4. Inspect installed extensions on Chrome, Edge, and Firefox and remove unauthorized add-ons.
5. Execute an endpoint antimalware scan to purge residual registry keys and temporary adware installers.

What to Avoid

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

1. Do not accept promotional upgrade offers or input payment credentials into the software interface.
2. Do not install software packages from unverified third-party freeware repositories.

References & External Analysis

• Microsoft Defender Threat Encyclopedia - PUA:Win32/YTDDownloader
• Malwarebytes Labs - PUP.Optional.YTDVideoDownloader Removal Guide
• Sophos Threat Center - YTDDownloader Analysis
• Search "ytddownloader" on VirusTotal (External Analysis)
• Search "ytddownloader" on Any.Run (Sandbox Sandbox)
• Search "ytddownloader" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Pua)

Explore other documented threats in the same operational category:

• Runbooster
• Soft32Dl
• Dlguide
• Deceptpcclean
• Prepscram
• Pccleaner
• 4Shared
• Outbrowse

Machine-readable

Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/ytddownloader.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.