CHFI Storage Forensics and File System Analysis Practice Question
During a memory forensics analysis using Volatility, an examiner runs 'python vol.py -f memory.dmp pslist' and sees a suspicious process named 'expl0rer.exe' with a PPID of 4. What does a PPID of 4 indicate, and what should the examiner do next?
⚠ Common exam trap
The CHFI exam often tests the misconception that PPID 4 always means a legitimate system process, but the trap is that the System process (PID 4) rarely has direct user-mode children, and any suspicious name warrants further analysis with 'psxview' and 'malfind'.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The process is probably a hidden or injected process; run 'psxview' and 'malfind' to detect anomalies
In Windows memory forensics, a PPID of 4 indicates the parent process is the System process (PID 4), which is the kernel-mode process responsible for starting system services and drivers. A suspicious process like 'expl0rer.exe' with PPID 4 is highly anomalous because legitimate user-mode processes are rarely direct children of the System process; the most notable legitimate exception is smss.exe. The examiner should run 'psxview' to check for hidden processes and 'malfind' to detect code injection, as this PPID can indicate a process masquerading as a system component or whose parent PID has been manipulated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The process is probably a hidden or injected process; run 'psxview' and 'malfind' to detect anomalies
Why this is correct
In Volatility, a process whose parent PID is 4 (System) is anomalous because the System kernel process rarely creates user-mode children; this pattern often appears when malware uses parent PID spoofing or when a process is hidden from the normal active process list. Run 'psxview' to cross-reference process listings from multiple sources (e.g., PsActiveProcessHead, PspCidTable, and CSRSS) to uncover hidden processes, and 'malfind' to locate executable pages containing injected shellcode such as an MZ header. These steps will confirm whether the process is truly malicious or merely unusual, making this the correct investigative action.
- ✗
The process is a child of the System process, indicating it is a legitimate system process; no further action needed
Why it's wrong here
Assuming that a process is legitimate simply because its parent is System (PID 4) is a dangerous fallacy; the System process acts as a kernel-mode launcher only for a handful of system processes (notably SMSS), so any user-mode child of System deserves heightened scrutiny rather than dismissal. Legitimate processes normally inherit their PPID from services.exe, wininit.exe, or explorer.exe, not directly from PID 4. Therefore, concluding that no further action is needed violates standard forensic methodology, which requires validation of process artifacts before ruling out malware.
- ✗
The process is a child of the System Idle Process, which is normal; ignore it
Why it's wrong here
This option confuses PID 4 with the System Idle Process, which actually has PID 0; PID 4 belongs to the System kernel process, not the idle thread, so the claimed basis is factually unsupported. Moreover, the System Idle Process never creates child processes, because it merely represents CPU idle time and exists only as an aggregation of idle threads per CPU. Even if the PPID were 0, that would be equally suspicious for a user-mode process; the correct reaction is to investigate the anomaly, not ignore it.
- ✗
The process has been injected into the System process and is likely a rootkit; run 'psscan' to verify
Why it's wrong here
A PPID of 4 indicates only that the process was created by the System process (via handle inheritance or a spoofed attribute block); it does not mean code was injected into System's address space. Injection is a memory-level technique where malicious code is written into another process's virtual memory, which is unrelated to the parent-child relationship. Running 'psscan' would list hidden processes by scanning physical memory, but it cannot verify injection; 'malfind' or 'hollowfind' are the appropriate plugins for that. Additionally, labeling it a rootkit without further evidence is premature and unsupported by the PPID fact alone.
Go deeper
Related to this question
Learn chapter
Forensic Investigation Process and Methodology
Key term
Memory Acquisition
Memory acquisition is the process of capturing the contents of a computer's volatile memory to preserve data for forensic analysis and incident response.
Key term
RAM Analysis
RAM Analysis is the forensic examination of a computer’s volatile memory to uncover evidence of running processes, network connections, malware, and user activity that is lost when the system is powered off.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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