Unruy

Overview

Unruy (identified across threat telemetry as Trojan:Win32/Unruy, Trojan-Clicker.Win32.Unruy, and Adware:Win32/Unruy) is an evasive background click-fraud trojan and ad-injection threat analyzed by Kaspersky, Trend Micro, and Microsoft Defender. Delivered primarily via stealthy trojan droppers, malvertising networks, and cracked utility downloads, Unruy operates silently in the background of infected Windows hosts. The malware initializes invisible, off-screen Internet Explorer or MSHTML browser controls to navigate to affiliate advertising links, sponsor banners, and pay-per-click landing pages without user awareness. Unruy utilizes encrypted HTTP communications to receive click commands, target URLs, and referrer strings from remote command-and-control servers, cycling through click targets while throttling network activity to avoid raising endpoint alarms. It establishes persistence by registering hidden Windows services and setting auto-start registry keys under HKLM\Software\Microsoft\Windows\CurrentVersion\Run.

Known aliases

Threat reports may refer to this family under multiple names:

• Trojan:Win32/Unruy
• Trojan-Clicker.Win32.Unruy
• Adware:Win32/Unruy
• Win32/Unruy.Clicker
• Trojan.Win32.Unruy

Family Pedigree & Lineage

Malware authors regularly fork and iterate upon existing codebases. Observed upstream lineage and downstream variants for this family include:

Derived From / Upstream Ancestry: Trojan_Clicker_Framework

Known Derivatives & Downstream Variants: Trojan-Clicker.Win32.Unruy.A · Win32.Unruy.Gen

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:

• T1059.001: Restrict execution of PowerShell. Enforce PowerShell Constrained Language Mode and Script Block Logging.
• 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):

Indicators of Compromise

Public indicators drawn from CISA advisories and vendor reporting. These are historical and intended for retrospective threat hunting; current campaigns may use different infrastructure. SystemHelpDesk adheres to responsible disclosure and does not host live samples.

File hashes (SHA-256, sample)

Cryptographic hashes serve as reference indicators for triage and detection rules. In accordance with responsible threat intelligence disclosure, this catalog indexes reference metadata and does not host or distribute live malware binaries.

• f1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2
• a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3

Delivery vectors

• Malvertising campaigns delivering silent exploit kit stagers
• Deceptive software installers and cracked games hosting clicker droppers

Persistence mechanisms

• HKLM\Software\Microsoft\Windows\CurrentVersion\Run\UnruyClicker
• HKLM\System\CurrentControlSet\Services\UnruySvc

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_UNRUY_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Unruy"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "unruy" ascii wide nocase
        $s2 = "trojan:win32/unruy" ascii wide nocase
        $s3 = "trojan-clicker.win32.unruy" ascii wide nocase
        $s4 = "adware:win32/unruy" ascii wide nocase
        $s5 = "win32/unruy.clicker" ascii wide nocase
        $s6 = "trojan.win32.unruy" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Unruy (Click Fraud) Execution & Triage
id: dd657eb6-2a12-5204-8d2f-a7b64760bbbf
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Unruy 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/unruy
- 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.click-fraud
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1189
- attack.t1059_001
- attack.t1547_001
- 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_UNRUY_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Unruy 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 = "unruy" 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. Isolate the infected endpoint to prevent ongoing fraudulent network click transmissions.
2. Terminate background processes spawning hidden MSHTML or Internet Explorer instances.
3. Remove persistent service configurations and registry Run entries associated with Unruy.
4. Perform an enterprise-wide EDR scan to detect secondary malware droppers delivered alongside Unruy.

What to Avoid

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

1. Do not allow uninspected outbound HTTP connections from system processes like svchost or taskhost.
2. Avoid dismissing unexpected network spikes on idle machines; click fraud trojans often generate continuous low-bandwidth background traffic.

References & External Analysis

• Kaspersky Securelist - Trojan-Clicker.Win32.Unruy Threat Overview
• Microsoft Defender Threat Encyclopedia - Trojan:Win32/Unruy Details
• NIST National Vulnerability Database - CVE-2014-6332
• Search "unruy" on VirusTotal (External Analysis)
• Search "unruy" on Any.Run (Sandbox Sandbox)
• Search "unruy" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Click Fraud)

Explore other documented threats in the same operational category:

• Ramdo
• Miuref

Machine-readable

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