How To Protect Your Schedule 1 Server From Malicious Mods and Security Threats

Note:

Community .dll assemblies can occasionally contain hidden security vulnerabilities, malicious token grabbers, remote shell executors, or unauthorized data exfiltration routines. MLVScan is a pre-runtime security scanner plugin for MelonLoader. Unlike standard gameplay mods, it executes during the earliest stage of the boot cycle to inspect every file inside your Mods/, Plugins/, and UserLibs/ directories. It intercepts dangerous operations before game code executes, blocks suspicious mods, and generates technical security audit logs.

1. Download the MLVScan Plugin

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2. Extract MLVScan Plugin

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3. Log In to Your Panel

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4. Select the ‘File’ Tab

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5. Select the ‘Plugin’ Folder

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6. Upload the “MLVScan.dll” Into the Plugin Folder

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7. Restart Your Server

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8. How the Security Scanning Engine Works

During server initialization, MLVScan runs static code analysis and heuristic behavioral checks across all assemblies:

Pre-Execution Assembly Analysis: Scans the bytecode of all .dll files in Mods/, Plugins/, and UserLibs/ before MelonLoader allows them to run Harmony patches or instantiate game components.

Native Process Execution Detection: Flags unsafe external process invocations (CreateProcess in kernel32.dll, ShellExecuteEx in shell32.dll, or hidden CMD/PowerShell executions).

Data Exfiltration Interception: Detects outbound HTTP POST and PUT payloads targeting unverified external webhooks or remote command-and-control servers.

Automated Threat Isolation: If an assembly triggers correlated high-risk signals, MLVScan blocks the file from executing and prevents malicious code from compromising the host system.

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9. Understanding Threat Severity Levels

Severity Level	Risk Profile	Detected Triggers	Recommended Action
CRITICAL	Immediate Security Threat	Webhook exfiltration, native shell execution (kernel32.dll, shell32.dll), memory scraping.	Delete immediately. Remove the flagged .dll from your Mods/ folder.
HIGH	High Risk / Dangerous API Calls	Unobfuscated network socket connections, file system manipulation outside the game directory.	Review the report details; verify the mod source with the author.
MEDIUM	Potential Risk / Obfuscation	Heavy string encryption, dynamic assembly loading, reflection over sensitive engine types.	Verify whether the mod uses legitimate anti-tamper or protection tools.
LOW	Minor Anomaly	Non-standard metadata, unverified author signatures, debug hooks.	Safe to keep if downloaded from a trusted Nexus Mods creator.

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10. Locate Generated Security Audit Reports

I. Navigate to the “UserData” Folder

II. Select the “MLVScan” Folder

III. Select the Latest .txt or .log Report File To Inspect Detailed Technical Findings.

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