recovering-deleted-files-with-photorec

Recover deleted files from disk images and storage media using PhotoRec's file signature-based carving engine regardless of file system damage.

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Repositório: AgentFlocks/flocks
Última atividade na origem: 5 de maio de 2026 às 05:45
Idioma detectado do SKILL.md: inglês
Estrelas: 445
Forks: 83

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name	recovering-deleted-files-with-photorec
description	Recover deleted files from disk images and storage media using PhotoRec's file signature-based carving engine regardless of file system damage.
domain	cybersecurity
subdomain	digital-forensics
tags	["forensics","file-recovery","photorec","file-carving","data-recovery","evidence-recovery"]
version	1.0
author	mahipal
license	Apache-2.0
nist_ai_rmf	["MEASURE-2.7","MAP-5.1","MANAGE-2.4"]
atlas_techniques	["AML.T0070","AML.T0066","AML.T0082"]
nist_csf	["RS.AN-01","RS.AN-03","DE.AE-02","RS.MA-01"]

Recovering Deleted Files with PhotoRec

When to Use

When recovering deleted files from a forensic disk image or storage device
When the file system is corrupted, formatted, or overwritten
During investigations requiring recovery of documents, images, videos, or databases
When file system metadata is unavailable but raw data sectors remain intact
For recovering files from memory cards, USB drives, and hard drives

Prerequisites

PhotoRec installed (part of TestDisk suite)
Forensic disk image or direct device access (read-only)
Sufficient output storage space (potentially larger than source)
Write-blocker if working with original media
Root/sudo privileges for device access
Knowledge of target file types for focused recovery

Workflow

Step 1: Install PhotoRec and Prepare the Environment

# Install TestDisk (includes PhotoRec) on Debian/Ubuntu
sudo apt-get install testdisk

# On RHEL/CentOS
sudo yum install testdisk

# On macOS
brew install testdisk

# Verify installation
photorec --version

# Create output directory structure
mkdir -p /cases/case-2024-001/recovered/{all,documents,images,databases}

# Verify the forensic image
file /cases/case-2024-001/images/evidence.dd
ls -lh /cases/case-2024-001/images/evidence.dd

Step 2: Run PhotoRec in Interactive Mode

# Launch PhotoRec against a forensic image
photorec /cases/case-2024-001/images/evidence.dd

# Interactive menu steps:
# 1. Select the disk image: evidence.dd
# 2. Select partition table type: [Intel] for MBR, [EFI GPT] for GPT
# 3. Select partition to scan (or "No partition" for whole disk)
# 4. Select filesystem type: [ext2/ext3/ext4] or [Other] for NTFS/FAT
# 5. Choose scan scope: [Free] (unallocated only) or [Whole] (entire partition)
# 6. Select output directory: /cases/case-2024-001/recovered/all/
# 7. Press C to confirm and begin recovery


 photorec /dev/sdb

# Non-interactive mode with specific file types
photorec /d /cases/case-2024-001/recovered/documents/ \
   /cmd /cases/case-2024-001/images/evidence.dd \
   partition_table,options,mode,fileopt,search

# Recover only specific file types using photorec command mode
photorec /d /cases/case-2024-001/recovered/documents/ \
   /cmd /cases/case-2024-001/images/evidence.dd \
   options,keep_corrupted_file,enable \
   fileopt,everything,disable \
   fileopt,doc,enable \
   fileopt,docx,enable \
   fileopt,pdf,enable \
   fileopt,xlsx,enable \
   search

# Recover only image files
photorec /d /cases/case-2024-001/recovered/images/ \
   /cmd /cases/case-2024-001/images/evidence.dd \
   fileopt,everything,disable \
   fileopt,jpg,enable \
   fileopt,png,enable \
   fileopt,gif,enable \
   fileopt,bmp,enable \
   fileopt,tif,enable \
   search

# Recover database files
photorec /d /cases/case-2024-001/recovered/databases/ \
   /cmd /cases/case-2024-001/images/evidence.dd \
   fileopt,everything,disable \
   fileopt,sqlite,enable \
   fileopt,dbf,enable \
   search

# PhotoRec outputs files into recup_dir.1, recup_dir.2, etc.
ls /cases/case-2024-001/recovered/all/

# Count recovered files by type
find /cases/case-2024-001/recovered/all/ -type f | \
   sed 's/.*\.//' | sort | uniq -c | sort -rn > /cases/case-2024-001/recovered/file_type_summary.txt

# Sort recovered files into directories by extension
cd /cases/case-2024-001/recovered/all/
for ext in jpg png pdf docx xlsx pptx zip sqlite; do
   mkdir -p /cases/case-2024-001/recovered/sorted/$ext
   find . -name "*.$ext" -exec cp {} /cases/case-2024-001/recovered/sorted/$ext/ \;
done

# Generate SHA-256 hashes for all recovered files
find /cases/case-2024-001/recovered/all/ -type f -exec sha256sum {} \; \
   > /cases/case-2024-001/recovered/recovered_hashes.txt

# Generate file listing with metadata
find /cases/case-2024-001/recovered/all/ -type f \
   -printf "%f\t%s\t%T+\t%p\n" | sort > /cases/case-2024-001/recovered/file_listing.txt

# Verify file integrity using file signatures
find /cases/case-2024-001/recovered/all/ -type f -exec file {} \; \
   > /cases/case-2024-001/recovered/file_signatures.txt

# Find files with mismatched extension/signature
while IFS= read -r line; do
   filepath=$(echo "$line" | cut -d: -f1)
   filetype=$(echo "$line" | cut -d: -f2-)
   ext="${filepath##*.}"
   if [[ "$ext" == "jpg" ]] && ! echo "$filetype" | grep -qi "JPEG"; then
      echo "MISMATCH: $filepath -> $filetype"
   fi
done < /cases/case-2024-001/recovered/file_signatures.txt > /cases/case-2024-001/recovered/mismatches.txt

# Filter out known-good files using NSRL hash comparison
hashdeep -r -c sha256 /cases/case-2024-001/recovered/all/ | \
   grep -vFf /opt/nsrl/nsrl_sha256.txt > /cases/case-2024-001/recovered/unknown_files.txt

# Remove zero-byte and corrupted files
find /cases/case-2024-001/recovered/all/ -type f -empty -delete
find /cases/case-2024-001/recovered/all/ -name "*.jpg" -exec jpeginfo -c {} \; 2>&1 | \
   grep "ERROR" > /cases/case-2024-001/recovered/corrupted_images.txt

Concept	Description
File carving	Recovering files from raw data using file header/footer signatures
File signatures	Magic bytes at the start of files identifying their type (e.g., FF D8 FF for JPEG)
Unallocated space	Disk sectors not assigned to any active file; may contain deleted data
Fragmented files	Files stored in non-contiguous sectors; harder to carve completely
Cluster/Block size	Minimum allocation unit on a file system; affects carving granularity
File footer	Byte sequence marking the end of a file (not all formats have footers)
Data remanence	Residual data remaining after deletion until sectors are overwritten
False positives	Carved artifacts that match signatures but contain corrupted or partial data

Tool	Purpose
PhotoRec	Open-source file carving tool supporting 300+ file formats
TestDisk	Companion tool for partition recovery and repair
Foremost	Alternative file carver originally developed by US Air Force OSI
Scalpel	High-performance file carver based on Foremost
hashdeep	Recursive hash computation and audit tool
jpeginfo	JPEG file integrity verification
file	Unix utility identifying file types by magic bytes
exiftool	Extract metadata from recovered image and document files

PhotoRec Recovery Summary:
  Source Image:     evidence.dd (500 GB)
  Partition:        NTFS (Partition 2)
  Scan Mode:        Free space only

  Files Recovered:  4,523
    Documents:      234 (doc: 45, docx: 89, pdf: 67, xlsx: 33)
    Images:         2,145 (jpg: 1,890, png: 198, gif: 57)
    Videos:         34 (mp4: 22, avi: 12)
    Archives:       67 (zip: 45, rar: 22)
    Databases:      12 (sqlite: 8, dbf: 4)
    Other:          2,031

  Data Recovered:   12.4 GB
  Corrupted Files:  312 (flagged for review)
  Output Directory: /cases/case-2024-001/recovered/all/
  Hash Manifest:    /cases/case-2024-001/recovered/recovered_hashes.txt