One of the most valuable skills a Security Operations Center (SOC) analyst can develop is the ability to analyze process relationships. While many security alerts focus on a single executable, experienced analysts know that understanding which process launched another process often provides far more insight than the executable itself. Parent-child process analysis helps identify malicious behavior that may otherwise appear legitimate and is an essential part of endpoint investigations.
Many common Windows applications, such as PowerShell, Command Prompt, and Windows Script Host, are legitimate administrative tools. However, when these programs are launched by unexpected parent processes, they may indicate malicious activity. By combining process analysis with the MITRE ATT&CK framework and the guidance provided by the NIST Cybersecurity Framework (CSF), SOC analysts can improve both threat detection and incident response.
What Are Parent and Child Processes?
Whenever a program starts another program, the original program is known as the parent process, while the newly launched program is called the child process.
For example, when a user opens Command Prompt from Windows Explorer, explorer.exe becomes the parent process, and cmd.exe becomes the child process. This is a common and expected relationship.
However, some parent-child relationships are much less common. If Microsoft Word launches powershell.exe, or if wscript.exe starts cmd.exe, analysts should investigate further because attackers frequently abuse these relationships to execute malicious commands.
Understanding normal parent-child relationships makes it much easier to identify suspicious behavior during endpoint investigations.
MITRE ATT&CK and Process Execution
The MITRE ATT&CK framework documents numerous techniques involving process execution. One of the most common is T1059 – Command and Scripting Interpreter, where attackers use tools such as PowerShell, Command Prompt, or scripting engines to execute commands after gaining access to a system.
Although PowerShell itself is not malicious, its parent process may reveal the true nature of the activity. For example, PowerShell launched by an enterprise management application during scheduled maintenance is usually expected. In contrast, PowerShell launched immediately after a user opens an email attachment deserves much closer attention.
MITRE ATT&CK encourages analysts to understand attacker behavior rather than relying solely on file names or simple signatures.
NIST Recommendations
The NIST Cybersecurity Framework emphasizes continuous monitoring and effective logging to improve detection capabilities.
Organizations should collect process creation logs whenever possible, including parent process information and command-line arguments. These details provide valuable context during investigations and allow analysts to reconstruct attacker activity more accurately.
NIST also recommends maintaining documented incident response procedures so investigators know how to validate suspicious process execution, gather supporting evidence, and determine whether containment is required.
Investigation Tips
When reviewing process activity, SOC analysts should ask several important questions:
- Which application launched the process?
- Is this parent-child relationship normal for the endpoint?
- Which user executed the process?
- Were encoded commands or unusual command-line arguments used?
- Did the process establish network connections or create additional child processes?
These questions help analysts distinguish legitimate administrative activity from malicious execution techniques.
Parent-child analysis becomes even more valuable when combined with endpoint telemetry, authentication logs, DNS requests, and firewall data to build a complete picture of the incident.
Conclusion
Understanding parent and child process relationships is a fundamental skill for every SOC analyst. While many Windows utilities are legitimate administrative tools, the process responsible for launching them often determines whether the activity is expected or suspicious.
By applying the behavioral guidance of the MITRE ATT&CK framework and the monitoring principles of the NIST Cybersecurity Framework, analysts can improve their ability to detect malicious process execution, reduce false positives, and conduct more effective investigations. In many cases, identifying an unusual parent-child relationship is the first clue that an attacker has successfully executed malicious code within an enterprise environment.