Youtubedownloaderguru

Overview

Executive Summary

Distribution and Technical Behavior

• Browser Hijacking: The software forcefully alters the default search engine and homepage of installed browsers (Chrome, Edge, Firefox). Search traffic is redirected through affiliate networks to generate pay-per-click revenue for the developers.
• Ad Injection and Overlays: The PUP often installs a background service or browser extension that intercepts web traffic. It injects banners, pop-unders, and sponsored links directly into the user's web viewing experience, regardless of the site they are visiting.
• Telemetry and Tracking: The application continuously tracks the user's browsing history, search queries, and the videos they download. This data is transmitted back to the developers and often sold to third-party marketing or data brokerage firms.

Risk Assessment

Mitigation and Removal Strategies

• Standard Uninstallation: In many cases, the PUP can be removed via the standard Windows "Add/Remove Programs" utility. However, users must be cautious of deceptive uninstallation prompts designed to cancel the removal process.
• Browser Reset: After removing the primary application, users must manually inspect their web browsers. Any unknown extensions must be deleted, and the browser settings (homepage, search engine) must be restored to their default state.
• Endpoint Scanning: Run a scan using a reputable anti-malware solution to ensure no secondary adware components or scheduled tasks were left behind to facilitate a re-infection.

Known aliases

Threat reports may refer to this family under multiple names:

• Adware.YoutubeDownloader
• PUP.VideoDownloader
• BrowserModifier:Win32/YoutubeDownloaderGuru

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:

• T1566.002: Inspect email links for known malicious domains and use link-rewriting services for time-of-click analysis.

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_YOUTUBEDOWNLOADERGURU_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Youtubedownloaderguru"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "youtubedownloaderguru" ascii wide nocase
        $s2 = "adware.youtubedownloader" ascii wide nocase
        $s3 = "pup.videodownloader" ascii wide nocase
        $s4 = "browsermodifier:win32/youtubedownloaderguru" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Youtubedownloaderguru (Trojan) Execution & Triage
id: 2af978db-6ebc-5ff3-9e11-e5c1c1641756
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Youtubedownloaderguru 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/youtubedownloaderguru
- https://malware-families-catalog.systemhelpdesk.com/defensive/downloader-dropper-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.trojan
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1566_002
- attack.t1176
- attack.t1112
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_YOUTUBEDOWNLOADERGURU_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Youtubedownloaderguru 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 = "youtubedownloaderguru" 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. Sever network connectivity for the flagged endpoint to terminate persistent command-and-control (C2) communication channels and stop Youtubedownloaderguru from retrieving secondary stage payloads.
2. Capture process memory triage to detect and terminate malicious threads injected by Youtubedownloaderguru into legitimate system processes such as explorer.exe or svchost.exe.
3. Audit Windows Registry Run keys (HKCU\Software\Microsoft\Windows\CurrentVersion\Run) and Task Scheduler entries to locate and purge Youtubedownloaderguru persistence hooks.
4. Deploy updated enterprise EDR detection signatures and conduct an out-of-band endpoint scan to isolate dropped binaries and staged payloads.
5. Rotate all credentials, domain user passwords, and session cookies active on the system during the Youtubedownloaderguru execution timeframe.

What to Avoid

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

1. Do not assume the incident is resolved simply because an antivirus tool removed the initial Youtubedownloaderguru dropper; always verify that secondary payloads and persistence hooks have been eradicated.
2. Avoid logging in with Domain Admin or privileged credentials on a machine suspected of running Youtubedownloaderguru until memory triage is complete.
3. Do not delay host isolation; automated lateral movement and credential dumping can occur within minutes of initial execution.

References & External Analysis

• Search "youtubedownloaderguru" on VirusTotal (External Analysis)
• Search "youtubedownloaderguru" on Any.Run (Sandbox Sandbox)
• Search "youtubedownloaderguru" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Trojan)

Explore other documented threats in the same operational category:

• Xxybvi
• Wecod
• Look2Me
• Kates
• Trjgen
• Hotkeyshook
• Wizrem
• Multidl

Machine-readable

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