oyi77/1ai-skills/acquiring-disk-image-with-dd-and-dcfldd

Acquiring Disk Image With Dd And Dcfldd

Overview

Cybersecurity skill for acquiring disk image with dd and dcfldd. Follows industry best practices and security standards.

When to Use

Trigger phrases:

• "acquiring disk image with dd and dcfldd"
• "Create forensically sound bit-for-bit disk images using dd and dcfldd while pres"

• When you need to create a forensic copy of a suspect drive for investigation
• During incident response when preserving volatile disk evidence before analysis
• When law enforcement or legal proceedings require a verified bit-for-bit copy
• Before performing any destructive analysis on a storage device
• When acquiring images from physical drives, USB devices, or memory cards

When NOT to Use

• When you lack proper authorization for testing
• For production systems without change management
• When the task requires legal or compliance expertise beyond technical scope

Prerequisites

• Linux-based forensic workstation (SIFT, Kali, or any Linux distro)
• dd (pre-installed on all Linux systems) or dcfldd (enhanced forensic version)
• Write-blocker hardware or software write-blocking configured
• Destination drive with sufficient storage (larger than source)
• Root/sudo privileges on the forensic workstation
• SHA-256 or MD5 hashing utilities (sha256sum, md5sum)

Workflow

# Example: IOC detection
import re
IOC_PATTERNS = {
    "ip": r"\b(?:\d{1,3}\.){3}\d{1,3}\b",
    "domain": r"\b[a-z0-9-]+\.[a-z]{2,}\b",
    "hash_md5": r"\b[a-f0-9]{32}\b",
    "hash_sha256": r"\b[a-f0-9]{64}\b",
}
def extract_iocs(text: str) -> dict:
    return {k: re.findall(v, text) for k, v in IOC_PATTERNS.items()}

1. Define Objectives — Clarify the goals and scope for disk image.
2. Gather Resources — Collect tools, data, and access needed for disk image.
3. Execute Process — Carry out disk image operations methodically.
4. Verify Quality — Check results against acceptance criteria.
5. Document Outcomes — Record findings, decisions, and next steps.

Tools

• dd and dcfldd — Primary tool for this skill
• Analysis Platform — Data processing and visualization
• Collaboration Tools — Team coordination and knowledge sharing

Process

1. Prepare — Gather requirements, verify prerequisites, set up environment
2. Execute — Run acquiring disk image with dd and dcfldd workflow with configured parameters
3. Verify — Validate output meets requirements, document results

Verification

• [ ] All disk image procedures executed completely and documented
• [ ] Findings validated against multiple data sources
• [ ] False positives identified and filtered
• [ ] Results documented with evidence and timestamps
• [ ] Recommendations provided with risk-based prioritization

Anti-Rationalization Table