Master cloud evidence preservation. Learn how to secure volatile environments before beginning the forensic acquisition process in AWS.
You are the lead digital forensics investigator at FinAnalytix, a financial analytics firm based in Chicago. The Security Operations Center (SOC) has escalated a priority incident: an Amazon EC2 instance (Instance ID: i-0abcd1234efgh5678) handling cross-border transaction logs is communicating with a known malicious command-and-control (C2) IP address located in a foreign jurisdiction.
The system is currently running, and the business unit has approved forensic acquisition. You must acquire a forensic image of the EBS volume while preserving the current state of the instance without triggering alerting mechanisms built by the attacker.
Artifact: VPC Flow Logs Excerpt
During a cross-border fraud investigation at a financial analytics company in Chicago, forensic responders suspect an Amazon EC2 instance has been compromised. To ensure evidence integrity while preserving the system state, which step should the forensic team perform immediately before taking a snapshot of the instance?
The VPC Flow Logs clearly demonstrate an ongoing TCP connection from the internal IP (10.0.1.55) to an external, known-malicious IP address over port 443. The persistence of this connection means the attacker has active shell access or an active beacon.
Preservation and Collection. We are transitioning from identifying the incident to preserving the digital crime scene in a cloud environment.
Isolating the EC2 instance (typically by applying a restrictive Security Group that drops all inbound and outbound traffic) must be done before initiating the snapshot. If the instance is not isolated, the attacker might notice the API calls, detect performance degradation from the snapshot process, and execute an anti-forensics script to wipe memory, delete logs, or destroy the file system before the snapshot completes.
A. Attach the evidence volume... This is an Analysis/Examination step that occurs after the snapshot has been taken and converted into a new volume.
C. Create evidence volume... This step occurs after the snapshot is successfully completed, not before.
D. Provision and launch... While necessary for the investigation, provisioning a workstation does not secure the compromised system. It does nothing to preserve the integrity of the evidence currently under attack.
In a live AWS response, the investigator would apply a "Forensic Isolation" Security Group to the instance. This SG denies all egress traffic and only allows ingress SSH/RDP from a dedicated forensic IP (if memory acquisition is required). Once isolated, the investigator executes the AWS API command: aws ec2 create-snapshot --volume-id vol-0123456789 --description "Forensic Evidence - Case 104".
Chain of Custody and evidence preservation principles apply equally to cloud environments, but the mechanisms change.
Master chain of custody, file system analysis, and cloud forensics.
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