Wintaskad

Overview

Adware:Win32/Wintaskad represents a family of highly aggressive advertising software (Adware or PUP) that relies on the Windows Task Scheduler (`T1053.005`) for persistence. Unlike simple browser extensions that only show ads when the user is surfing the web, Wintaskad ensures that intrusive, full-screen advertisements or browser redirects are launched on a set schedule, even if the user isn't actively using the computer.

Understanding Wintaskad (Scheduled Persistence)
To an end-user, Wintaskad is infuriating. Their default browser will suddenly launch itself in the middle of a presentation or while playing a game, forcing them to a spam, survey, or malvertising website. For an IT department, this indicates a failure of endpoint security, usually caused by the user installing bundled 'freeware' or cracking tools.

Execution and Persistence Mechanics
During its covert installation (`T1204.002`), Wintaskad drops its executables (often heavily obfuscated) into hidden folders within `%AppData%` or `ProgramData`. The critical step is the creation of multiple Windows Scheduled Tasks. These tasks are configured to trigger the adware payload periodically (e.g., every 30 minutes, or at system idle). The tasks often use native tools (like `cmd.exe` or `powershell.exe`) to launch a URL, making the execution look slightly more legitimate to basic AV.

Indicators of Compromise & Impact
The primary impact is severe disruption and exposure to secondary infections via malicious ads. Host-based IoCs are centered entirely around the Windows Task Scheduler (`schtasks.exe`). Look for unexpected tasks with names like 'System Update Service', 'Chrome Optimizer', or random GUID strings. The actions for these tasks will reveal commands pointing to suspicious executables or direct URLs to advertising networks.

MITRE ATT&CK Techniques

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

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

Sigma Rule

title: Suspicious Wintaskad Activity
id: fee5f72c46e7d8533ae703d1e3ff1bb1
status: experimental
description: Detects generic indicators of the wintaskad malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*wintaskad*"
    condition: selection
level: medium

Containment & Response Steps

Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.

1. Open the Windows Task Scheduler (`taskschd.msc`) and manually audit all active tasks, looking for suspicious actions or triggers.
2. Use `schtasks /query /fo LIST /v` from an administrative command prompt to export all task details for analysis.
3. Delete the malicious scheduled tasks, then locate and remove the associated executable files from the user's profile.
4. Run a thorough scan with a dedicated anti-malware/anti-PUP tool to remove any remaining registry hooks.

What to Avoid

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

1. Do not simply delete the adware executable without removing the Scheduled Task; Windows will throw constant 'file not found' errors on the schedule.
2. Avoid trusting the names of the scheduled tasks, as they are specifically designed to look like legitimate Windows or Google updaters.

References & External Analysis

• Search "wintaskad" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: advanced_threat)

Explore other malware families in the same category:

• Nieguide
• Redirect
• Smominru
• Clearlog
• Keyer

Machine-readable

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