Installmonster

Overview

Adware:Win32/InstallMonster is a massive Russian pay-per-install (PPI) adware framework designed to forcefully bundle Potentially Unwanted Programs (PUPs) and browser hijackers onto user machines.

Understanding InstallMonster
To the end-user, InstallMonster is the root cause of a sudden flood of desktop shortcuts, changed homepages, and aggressive pop-up advertisements. For threat intelligence, InstallMonster represents a highly organized affiliate network. Software developers pay the InstallMonster network to bundle their toolbars or adware into legitimate freeware installers. The affiliate who facilitates the download gets a cut of the revenue, driving massive, deceptive distribution campaigns.

Execution and Evasion Strategies
InstallMonster relies on social engineering during the software installation process. Users are presented with confusing opt-out screens or pre-checked boxes while installing media players or PDF converters. Once executed, the framework reaches out to its C2 servers to determine which adware payloads will generate the most revenue for that specific geographic region. It then silently downloads and installs a myriad of toolbars, crypto-miners, or search hijackers, modifying the Windows Registry to establish persistence.

Indicators of Compromise (IoCs)
Threat hunters will notice a massive spike in outbound HTTP/HTTPS connections to known PPI tracking domains (e.g., installmonster.ru or affiliate links). The <code>%ProgramFiles% and %AppData% directories will suddenly fill with randomly named folders containing unwanted software. The Windows Certificate Store may also be modified to trust self-signed certificates used by the adware to intercept SSL traffic.

Known aliases

Threat reports may refer to this family under multiple names:

• amonetize
• installcube

MITRE ATT&CK Techniques

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

Tactical Mitigations

Based on the techniques used by this family, consider the following defensive strategies:

• T1105: Implement network intrusion detection systems (NIDS) and host-based firewalls to block unauthorized inbound or outbound file transfers.

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_INSTALLMONSTER {
    meta:
        description = "Detects Installmonster (pua)"
        author = "SystemHelpdesk Boilerplate Generator"
        date = "2026-07-06"
    strings:
        $s1 = "installmonster" ascii wide nocase
        $s2 = "amonetize" ascii wide nocase
        $s3 = "installcube" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

Sigma Rule

title: Suspicious Installmonster Activity
id: 90e80733c5bcb582ccc6cd04e5865ec1
status: experimental
description: Detects generic indicators of the installmonster malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*installmonster*"
            - "*amonetize*"
            - "*installcube*"
    condition: selection
level: medium

Containment & Response Steps

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

1. Quarantine the endpoint to halt the continuous downloading of secondary adware and PUA payloads.
2. Deploy specialized adware removal tools (like Malwarebytes or AdwCleaner) to automatically identify and strip the bundled software.
3. Manually audit the 'Add/Remove Programs' list to uninstall any lingering toolbars or 'PC Optimizers'.
4. Reset all web browsers to their factory defaults to purge rogue extensions and restore legitimate search engine configurations.

What to Avoid

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

1. Do not trust the uninstallers provided by the adware; they frequently execute secondary scripts to reinstall the software later.
2. Avoid ignoring the infection as a 'low severity' threat; PPI networks frequently pivot to dropping banking trojans or ransomware if it is more profitable.

References & External Analysis

• Search "installmonster" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: pua)

Explore other malware families in the same category:

• Filetour
• Softonic
• Csdimonetize
• Firseria
• Dlhelper

Machine-readable

Get this profile as JSON: https://jordan123234-malware-families-explorer.static.hf.space/api/installmonster.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.