Welcome to the CHFI 312-49 Digital Forensics Simulator. This scenario will test your understanding of jurisdictional and responsibility boundaries in Cloud Forensics. Analyze the evidence and select the correct investigative conclusion.
CHFI (312-49) Digital Forensics Simulation
Investigation Scenario
You are a digital forensics investigator hired by TechNova Corp. The company recently suffered a massive data breach where a customer database was exfiltrated from a virtual machine hosted on an Infrastructure as a Service (IaaS) cloud provider.
TechNova's legal department intends to sue the cloud provider, claiming the provider failed to secure the virtual machine from brute-force attacks. As the lead investigator, you must establish the boundaries of the investigation, determine who had administrative control over the compromised assets, and identify where the liability lies before proceeding with the forensic acquisition.
Evidence Collected
During the Identification and Preparation phase, the following documentation and logs were acquired:
[EVIDENCE ITEM 01: Cloud Provider Master Service Agreement (MSA)]
Section 4.2 Security Boundaries:
"The Provider is responsible for the physical security of the data centers, the hypervisor layer, and the underlying host operating systems. The Customer assumes full responsibility for the security, patching, and access control of any Guest Operating Systems deployed on the Provider's infrastructure."
[EVIDENCE ITEM 02: Cloud API Logs (CloudTrail equivalent)]
EventTime: 2023-11-12T04:15:22Z
EventName: AuthorizeSecurityGroupIngress
UserIdentity: arn:cloud:iam::123456789012:user/TechNovaAdmin
RequestParameters:
portRange: 3389 (RDP)
cidrIp: 0.0.0.0/0 (Open to World)
[EVIDENCE ITEM 03: Guest OS Event Logs (Windows Event Security)]
Event ID: 4624 (Logon Success)
Logon Type: 10 (RemoteInteractive)
Source Network Address: 198.51.100.45 (Known Malicious IP)
User: Administrator
Question
In Cloud Forensics, what does the "Shared Responsibility Model" define?
Investigator's Hint: Review Evidence Item 01. Notice how the MSA clearly delineates tasks. Does the provider secure the data center? Yes. Does the provider secure the Guest OS in an IaaS environment? No. The level of control dictates the level of responsibility.
Expert Analysis
1. What the evidence shows
The evidence clearly shows that a TechNova administrator (Customer) intentionally or accidentally misconfigured the cloud firewall (Security Group) to allow global RDP access to the virtual machine. Following this misconfiguration, a threat actor successfully brute-forced the Administrator account on the Guest OS. The Service Agreement explicitly states that the Guest OS security belongs to the customer.
2. Forensic Stage
Identification & Analysis: The investigator is analyzing the scope of the incident and identifying jurisdictional boundaries within the cloud environment before proceeding with further evidence collection.
3. Why the correct answer is correct (Option A)
The "Shared Responsibility Model" is a fundamental concept in cloud computing and forensics. It dictates that the Cloud Service Provider (CSP) is responsible for the "security OF the cloud" (physical infrastructure, hypervisors, hardware), while the customer is responsible for "security IN the cloud" (customer data, IAM, guest operating systems, application configurations). The exact line of division shifts depending on whether the service is IaaS, PaaS, or SaaS.
4. Why the other options are wrong
B is incorrect: The customer does not manage physical data centers or the hypervisor virtualization layer. If the hypervisor was breached, the provider would be responsible.
C is incorrect: The provider has zero visibility into or control over the data the customer puts inside an IaaS virtual machine, nor do they manage the customer's application-level passwords.
D is incorrect: While governments provide regulatory frameworks (like GDPR or HIPAA), they do not manage or operate private sector cloud security controls.
5. Real-world forensic action
In a real-world scenario, the investigator must use the Shared Responsibility Model to determine where to collect evidence. Since this was an IaaS breach caused by a Guest OS compromise, the investigator must acquire logs from the Customer's Cloud Management Console (e.g., AWS CloudTrail) and acquire an image/snapshot of the compromised Virtual Machine volume. The investigator cannot subpoena the provider for hypervisor logs unless a hypervisor breakout is suspected.
MINI LESSON: The Shift in Forensic Acquisition based on Cloud Models
The type of cloud service dramatically alters the forensic process:
IaaS (Infrastructure as a Service): You can take full disk snapshots of the VM and analyze file systems, registry, and memory. (Highest customer control/responsibility).
PaaS (Platform as a Service): You cannot image the underlying OS. You must rely on application logs, database transaction logs, and API logs.
SaaS (Software as a Service): You are entirely reliant on the application-level logs the provider exposes via their administration portal (e.g., Microsoft 365 Unified Audit Log). (Highest provider control/responsibility).