Silentall

Overview

HackTool:Win32/Silentall (or simply 'Silent Installers') is a heuristic classification used by endpoint security solutions to flag executable files that act as automated software wrappers. These wrappers are designed to unpack and install bundled software packages completely silently in the background, without presenting a User Interface (UI), End User License Agreement (EULA), or any prompts to the user. While they can be used for legitimate IT deployment, threat actors heavily abuse them to deploy adware and malware without user interaction.

Understanding Silent Installers
To an end-user, the execution of a Silentall wrapper is invisible; they double-click a file, nothing seems to happen, but suddenly new toolbars or programs appear on their system. For a security analyst, a silent installer found outside of a managed IT deployment tool (like SCCM or Intune) is highly suspicious. It is the primary delivery mechanism for the Pay-Per-Install (PPI) adware ecosystem, allowing attackers to install multiple payloads with a single user click.

Execution and Bundling Mechanics
The infection typically begins when a user downloads a 'cracked' game or a freeware bundle (`T1189`). When the user executes the file (`T1204.002`), the Silentall wrapper executes a batch script or utilizes command-line switches (like `/S` or `/quiet`) (`T1059.004`) to silently execute multiple secondary MSIs or EXEs hidden within its archive. It bypasses all user consent mechanisms. These secondary payloads often install rogue browser extensions (`T1176`), modify the browser's default search engine (`T1112`), and establish persistence via Registry Run keys.

Indicators of Compromise & Impact
The primary impact is the unauthorized installation of Potentially Unwanted Programs (PUAs) and adware, leading to a degraded user experience and privacy risks. Incident responders will observe a single executable (the wrapper) rapidly spawning multiple child processes (the installers) in the background. EDR logs will flag the use of silent command-line switches and the rapid modification of browser preference files and Registry Run keys.

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:

• T1059.004: Restrict execution of scripting languages such as PowerShell, VBScript, or Python to authorized administrators. Enforce Script Block Logging.

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

Sigma Rule

title: Suspicious Silentall Activity
id: 4872db0669eb6e3d054f4671e7161a83
status: experimental
description: Detects generic indicators of the silentall malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*silentall*"
    condition: selection
level: medium

Containment & Response Steps

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

1. Use the Windows Control Panel to systematically identify and uninstall all recently added programs, focusing on toolbars and 'search protectors'.
2. Deploy an enterprise adware removal tool (e.g., AdwCleaner) to strip the deeply embedded Scheduled Tasks and registry hooks left behind by the bundled adware.
3. Force a complete reset of all installed web browsers to factory defaults to eradicate rogue extensions and restore the homepage.
4. Investigate the source of the Silentall wrapper to determine how it bypassed perimeter defenses.

What to Avoid

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

1. Do not assume the execution failed just because no UI was presented; silent installers are designed to work completely in the background.
2. Avoid ignoring the infection; the use of a silent installer indicates an intentional effort to bypass user consent, a hallmark of malicious software.

References & External Analysis

• Search "silentall" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: advanced_threat)

Explore other malware families in the same category:

• Rontokbr
• Systimizer
• Cloudscout
• Multibar
• Primecasino

Machine-readable

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