Cybersecurity Ops with bash. Attack, Defend, and Analyze from the Command Line

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• Preface
  • Who This Book Is For
  • Bash or bash
  • Script Robustness
  • Workshops
  • Conventions Used in This Book
  • Using Code Examples
  • OReilly Online Learning
  • How to Contact Us
  • Acknowledgments
  • Disclaimer
• I. Foundations
• 1. Command-Line Primer
  • The Command Line Defined
  • Why bash?
  • Command-Line Illustrations
  • Running Linux and bash on Windows
    • Git Bash
    • Cygwin
    • Windows Subsystem for Linux
    • Windows Command Prompt and PowerShell
  • Command-Line Basics
    • Commands, Arguments, Built-ins, and Keywords
    • Standard Input/Output/Error
    • Redirection and Piping
    • Running Commands in the Background
    • From Command Line to Script
  • Summary
  • Workshop
• 2. Bash Primer
  • Output
  • Variables
    • Positional Parameters
  • Input
  • Conditionals
  • Looping
  • Functions
    • Function Arguments
    • Returning Values
  • Pattern Matching in bash
  • Writing Your First ScriptDetecting Operating System Type
  • Summary
  • Workshop
• 3. Regular Expressions Primer
  • Commands in Use
    • grep
      • Common command options
      • Command example
    • grep and egrep
  • Regular Expression Metacharacters
    • The . Metacharacter
    • The ? Metacharacter
    • The * Metacharacter
    • The + Metacharacter
    • Grouping
    • Brackets and Character Classes
    • Back References
    • Quantifiers
    • Anchors and Word Boundaries
  • Summary
  • Workshop
• 4. Principles of Defense and Offense
  • Cybersecurity
    • Confidentiality
    • Integrity
    • Availability
    • Nonrepudiation
    • Authentication
  • The Attack Life Cycle
    • Reconnaissance
    • Initial Exploitation
    • Establish Foothold
    • Escalate Privileges
    • Internal Reconnaissance
    • Lateral Movement
    • Maintain Presence
    • Complete Mission
  • Summary
• II. Defensive Security Operations with bash
• 5. Data Collection
  • Commands in Use
    • cut
      • Common command options
      • Command example
    • file
      • Common command options
      • Command example
    • head
      • Common command options
    • reg
      • Common command parameters
      • Command example
    • wevtutil
      • Common command parameters
      • Common command options
      • Command example
  • Gathering System Information
    • Executing a Command Remotely Using SSH
    • Gathering Linux Logfiles
    • Gathering Windows Logfiles
    • Gathering System Information
    • Gathering the Windows Registry
  • Searching the Filesystem
    • Searching by Filename
    • Searching for Hidden Files
    • Searching by File Size
    • Searching by Time
    • Searching for Content
    • Searching by File Type
    • Searching by Message Digest Value
  • Transferring Data
  • Summary
  • Workshop
• 6. Data Processing
  • Commands in Use
    • awk
      • Common command options
      • Command example
    • join
      • Common command options
      • Command example
    • sed
      • Common command options
      • Command example
    • tail
      • Common command options
      • Command example
    • tr
      • Common command options
      • Command example
  • Processing Delimited Files
    • Iterating Through Delimited Data
    • Processing by Character Position
  • Processing XML
  • Processing JSON
  • Aggregating Data
  • Summary
  • Workshop
• 7. Data Analysis
  • Commands in Use
    • sort
      • Common command options
      • Command example
    • uniq
      • Common command options
  • Web Server Access Log Familiarization
  • Sorting and Arranging Data
  • Counting Occurrences in Data
  • Totaling Numbers in Data
  • Displaying Data in a Histogram
  • Finding Uniqueness in Data
  • Identifying Anomalies in Data
  • Summary
  • Workshop
• 8. Real-Time Log Monitoring
  • Monitoring Text Logs
    • Log-Based Intrusion Detection
  • Monitoring Windows Logs
  • Generating a Real-Time Histogram
  • Summary
  • Workshop
• 9. Tool: Network Monitor
  • Commands in Use
    • crontab
      • Common command options
    • schtasks
      • Common command options
  • Step 1: Creating a Port Scanner
  • Step 2: Comparing to Previous Output
  • Step 3: Automation and Notification
    • Scheduling a Task in Linux
    • Scheduling a Task in Windows
  • Summary
  • Workshop
• 10. Tool: Filesystem Monitor
  • Commands in Use
    • sdiff
      • Common command options
      • Command example
  • Step 1: Baselining the Filesystem
  • Step 2: Detecting Changes to the Baseline
  • Step 3: Automation and Notification
  • Summary
  • Workshop
• 11. Malware Analysis
  • Commands in Use
    • curl
      • Common command options
      • Command example
    • vi
      • Command example
    • xxd
      • Common command options
      • Command example
  • Reverse Engineering
    • Hexadecimal, Decimal, Binary, and ASCII Conversions
    • Analyzing with xxd
      • Hex editor
  • Extracting Strings
  • Interfacing with VirusTotal
    • Searching the Database by Hash Value
    • Scanning a File
    • Scanning URLs, Domains, and IP Addresses
  • Summary
  • Workshop
• 12. Formatting and Reporting
  • Commands in Use
    • tput
      • Common command parameters
  • Formatting for Display and Print with HTML
  • Creating a Dashboard
  • Summary
  • Workshop
• III. Penetration Testing with bash
• 13. Reconnaissance
  • Commands in Use
    • ftp
      • Common command options
      • Command example
  • Crawling Websites
  • Automated Banner Grabbing
  • Summary
  • Workshop
• 14. Script Obfuscation
  • Commands in Use
    • base64
      • Common command options
      • Command example
    • eval
      • Command example
  • Obfuscating Syntax
  • Obfuscating Logic
  • Encrypting
    • Cryptography Primer
      • Encryption
      • Decryption
      • Cryptographic key
    • Encrypting the Script
    • Creating the Wrapper
    • Creating Your Own Crypto
  • Summary
  • Workshop
• 15. Tool: Command-Line Fuzzer
  • Implementation
  • Summary
  • Workshop
• 16. Establishing a Foothold
  • Commands in Use
    • nc
      • Common command options
      • Command example
  • Single-Line Backdoors
    • Reverse SSH
    • Bash Backdoor
  • Custom Remote-Access Tool
    • Implementation
  • Summary
  • Workshop
• IV. Security Administration with bash
• 17. Users, Groups, and Permissions
  • Commands in Use
    • chmod
      • Common command options
    • chown
      • Common command options
    • getfacl
      • Common command options
    • groupadd
      • Common command options
    • setfacl
      • Common command options
    • useradd
      • Common command options
    • usermod
      • Common command options
    • icacls
      • Common command options
    • net
      • Common command options
  • Users and Groups
    • Creating Linux Users and Groups
    • Creating Windows Users and Groups
  • File Permissions and Access Control Lists
    • Linux File Permissions
      • Linux access control lists
    • Windows File Permissions
  • Making Bulk Changes
  • Summary
  • Workshop
• 18. Writing Log Entries
  • Commands in Use
    • eventcreate
      • Common command options
    • logger
      • Common command options
  • Writing Windows Logs
  • Writing Linux Logs
  • Summary
  • Workshop
• 19. Tool: System Availability Monitor
  • Commands in Use
    • ping
      • Common command options
      • Command example
  • Implementation
  • Summary
  • Workshop
• 20. Tool: Software Inventory
  • Commands in Use
    • apt
      • Common command options
      • Command example
    • dpkg
      • Common command options
      • Command example
    • wmic
      • Common command options
      • Command example
    • yum
      • Common command options
      • Command example
  • Implementation
  • Identifying Other Software
  • Summary
  • Workshop
• 21. Tool: Validating Configuration
  • Implementation
  • Summary
  • Workshop
• 22. Tool: Account Auditing
  • Have I Been Pwned?
  • Checking for a Breached Password
  • Checking for a Breached Email Address
    • Batch-Processing Emails
  • Summary
  • Workshop
• 23. Conclusion
• Index

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