Course 30 - Practical Malware Development - Beginner Level | Episode 2: Mastering C# System Control: Navigating, Enumerating, and Executing

In this lesson, you’ll learn about: Detecting and defending against system control techniques1. Directory Navigation & Enumeration (Detection)What attackers typically do:List files and directoriesChange working directories to explore the systemWhy it matters:Helps locate sensitive files (credentials, configs, backups)Defensive strategies:Monitor processes accessing large numbers of files Detect unusual access to:System directoriesUser profile foldersUse file integrity monitoring (FIM) tools2. System Information Retrieval (Reconnaissance Detection)Common data collected:Hostname, username, OS versionRunning processes and privilegesWhy it matters:Enables privilege escalation and tailored attacksDefensive strategies:Use EDR solutions to detect:Scripts or processes querying system info repeatedlyMonitor abnormal use of:Environment variablesProcess enumeration APIs3. Command Execution via Shell (High-Risk Behavior)Typical attacker behavior:Launching cmd.exe or PowerShell silentlyRedirecting output for remote useRed flags:Hidden or background shell executionNon-interactive processes spawning command shellsDefensive strategies:Enable logging:Process creation events (e.g., Event ID 4688)Detect:Parent-child anomalies (e.g., Office → cmd.exe)Use:Application allowlistingPowerShell constrained language mode4. Command Parsing & Remote Control PatternsBehavior pattern:Program receives commands → parses them → executes locallyIndicators of compromise (IOCs):Repeated outbound connections to a single endpointCommands executed without user interactionConsistent “beaconing” intervalsDefensive strategies:Monitor network traffic patterns (C2 detection)Apply egress filtering (block unknown outbound traffic)Use behavioral analytics to detect automation patternsKey TakeawaysThese techniques represent core attacker tradecraft:File system explorationSystem reconnaissanceCommand executionStrong defense relies on:Visibility (logs, EDR, network monitoring)Control (least privilege, allowlisting)Detection (behavior-based alerts, anomaly detection)You can listen and download our episodes for free on more than 10 different platforms:https://linktr.ee/cybercode_academy