Cntads

Overview

Executive Summary

Infection Vector and Operational Tactics

• Aggressive Ad Injection: Cntads injects JavaScript into active browsing sessions, overlaying legitimate websites with intrusive pop-ups, pop-unders, and banner advertisements. It often highlights random words in text, turning them into sponsored hyperlinks.
• Browser Hijacking: The adware frequently alters the default search engine and homepage to direct all user queries through a custom, affiliate-linked search portal.
• Persistence Mechanisms: Cntads is notoriously difficult to remove manually. It utilizes hidden scheduled tasks, malicious browser extensions, and registry run keys to automatically reinstall itself if basic removal attempts are made.

Privacy and Security Implications

Mitigation and Removal

• Comprehensive EPP Scanning: Utilize enterprise-grade anti-malware solutions to detect and quarantine the core Cntads executables and associated dynamic link libraries (DLLs).
• Browser Reset and Extension Removal: Manually delete all suspicious browser extensions and perform a full reset of the affected web browsers to clear hijacked search and homepage settings.
• Task Scheduler Audit: Open the Windows Task Scheduler (`taskschd.msc`) and manually delete any anomalous tasks created by Cntads to ensure persistence is broken.

Known aliases

Threat reports may refer to this family under multiple names:

• Adware.Cntads
• PUP.Cntads
• Cntads Adware

MITRE ATT&CK Techniques

This family has been observed using the following ATT&CK techniques: T1566.002 T1176 T1547.001

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.

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_CNTADS {
    meta:
        description = "Detects Cntads (advanced_threat)"
        author = "SystemHelpdesk Boilerplate Generator"
        date = "2026-07-06"
    strings:
        $s1 = "cntads" ascii wide nocase
        $s2 = "adware.cntads" ascii wide nocase
        $s3 = "pup.cntads" ascii wide nocase
        $s4 = "cntads adware" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

Sigma Rule

title: Suspicious Cntads Activity
id: f5b1254059ac35cbc58723ffcd88845a
status: experimental
description: Detects generic indicators of the cntads malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*cntads*"
            - "*adware.cntads*"
            - "*pup.cntads*"
            - "*cntads adware*"
    condition: selection
level: medium

References & External Analysis

• Search "cntads" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: advanced_threat)

Explore other malware families in the same category:

• Installmonetizer
• Pswdump
• Ruanmei
• Vtub
• Vonteera

Machine-readable

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