Allstars

Overview

Adware:Win32/Allstars is an intrusive adware family designed to hijack the user's web browsing experience. Its primary goal is monetization through forced ad impressions, pop-ups, and affiliate link redirection. Allstars targets the browser's core components, injecting advertisements directly into web pages and altering default search settings without user consent (`T1189`).

Understanding Allstars (Adware/PUP)
To an end-user, Allstars degrades system performance and internet speed. Legitimate search results are replaced with sponsored links, and pop-ups appear regardless of the site being visited. For an IT department, Allstars represents a vector for more severe malware, as the 'bargain' ad networks it relies upon are frequently abused to serve exploits (malvertising).

Execution and Hijacking Mechanics
Allstars is typically distributed via pay-per-install (PPI) networks or bundled with freeware downloads. Upon execution, it installs itself as a Windows Service or Scheduled Task to ensure persistence (`T1543.003`). It drops malicious extensions into Chrome, Edge, and Firefox. To prevent easy removal, Allstars may modify the Windows Registry (specifically the `ExtensionInstallForcelist` policies) (`T1562.001`), locking the extension so the user cannot simply uninstall it via the browser's settings menu.

Indicators of Compromise & Impact
The primary impact is the unauthorized monetization of user data and the display of unwanted content. Host-based IoCs include the presence of unexpected browser extensions, unauthorized modifications to browser policy registry keys, and unexpected executables running from `%LocalAppData%` or `%ProgramFiles%`. Network IoCs involve constant, high-volume background HTTP/HTTPS requests to known advertising networks and affiliate tracking domains.

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

Sigma Rule

title: Suspicious Allstars Activity
id: 34f9b0c32c6c4a9559c1ac4d99653cce
status: experimental
description: Detects generic indicators of the allstars malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*allstars*"
    condition: selection
level: medium

Containment & Response Steps

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

1. Use a specialized Adware/Malware removal tool to identify and strip out the persistent registry keys and services protecting Allstars.
2. Manually inspect and remove any forced browser policies (`chrome://policy` or `edge://policy`) that prevent extension removal.
3. Reset all installed web browsers to their default, factory settings to clear out hijacked search engines and proxy configurations.
4. Implement endpoint application control to block the execution of common adware installers from user directories.

What to Avoid

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

1. Do not rely solely on the browser's 'Uninstall Extension' button; Allstars's background service will simply reinstall it.
2. Avoid downloading 'free' software from third-party download portals, as they are the primary distribution vector for bundled adware.

References & External Analysis

• Search "allstars" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: advanced_threat)

Explore other malware families in the same category:

• Deepsea
• Bunndle
• Dropware
• Vtub
• Webalta

Machine-readable

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