Hi Dev Community! 👋 I wanted to share a project I recently launched: QRScanner. Most online QR code tools out there are either hidden behind a paywall, filled with annoying pop-up ads, or force you to download an app. I wanted a clean, f…

Sichere Programmierung dev.to 03.07.2026, 16:29 Uhr 2 Min. Lesezeit Cloud & IT-Enterprise

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Deep Tech

Building a Fast, Free Online QR Scanner and Generator (Open Source) Hi Dev Community!

Angriffsfläche

Enterprise IT / Cloud Infrastruktur

Exploit-Status

Geringe Ausnutzungswahrscheinlichkeit / Keine aktiven Kampagnen

Sofortmaßnahme

Asset-Inventar prüfen & Upstream-Advisory überwachen

Hi Dev Community! 👋

I wanted to share a project I recently launched: QRScanner.

Most online QR code tools out there are either hidden behind a paywall, filled with annoying pop-up ads, or force you to download an app. I wanted a clean, fast, and privacy-focused alternative, so I decided to build one myself!

it's fully hosted on Netlify and open-source.

🚀 Live Demo & Repository

Live Tool: [https://qrscaner.netlify.app/](https://qrscaner.netlify.app/)

Features: Scan via Camera, Upload Images, and Generate custom QRs (WiFi, WhatsApp, Text, URLs).

🛠️ Tech Stack & Features

I kept the architecture lightweight and straightforward to ensure maximum speed directly in the browser:

HTML5 / CSS3: Custom UI with a clean dark/light theme experience.

Vanilla JavaScript: Fast decoding logic without heavy framework overhead.

Privacy First: No data is sent to any server; everything happens locally on your device.

💡 What I Learned

Building this project helped me understand browser-based camera permissions better and how to optimize image scanning directly from the device gallery efficiently.

I would love to get your feedback on the UI, performance, or any features you think I should add next. If you find it useful, feel free to bookmark it or star the repo!

Let me know what you think in the comments below! 👇

1. Sofort-Triage & Abwehrmaßnahmen

IR-PLAYBOOK-RCEHIGH

Schritte anzeigen

SOC Incident Playbook: Remote Code Execution (RCE) Defense

WAF MitigationSofort

Virtuelles Patchen am Reverse Proxy / WAF für gefährdete URL-Pfade und Payloads aktivieren.

SecRule REQUEST_URI "@rx ..." "id:1001,phase:1,deny,status:403"

Web Shell ScanSofort

Web-Root auf neu angelegte Scripts, anomal modifizierte Dateien und Persistence scannen.

find /var/www -type f -name "*.php" -mmin -120

Outbound FilteringSofort

Ausgehenden Datenverkehr (Reverse Shells zu unbekannten IPs/Ports) blockieren.

ss -tunp | grep -E ":(4444|1337|8080|9001)"

Vendor Patching

Hersteller-Update in Staging validieren und schnellstmöglich in Produktion ausrollen.

apt update && apt --only-upgrade install <pkg>

1-Click Detection Engineering: Multi-Dialect SIEM Rules5 Formate

Regeln anzeigen

Syntax validiert (0 Fehler)

title: Detect Exploitation - Building a Fast, Free Online QR Scanner and Generator (Open Source)
id: b2b22829-75a2-4c99-8fb6-88bbfbb35d5f
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
  - https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-26
logsource:
  category: network_connection
  product: any
detection:
  selection:
      CommandLine|contains:
        - 'exploit'
  condition: selection
falsepositives:
  - Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
  - attack.initial_access

Syntax validiert (0 Fehler)

rule CTI_Threat_Indicator {
    meta:
        author = "iShareStuff CTI Automated Detection Engine"
        date = "2026-09-26"
        description = "YARA Signature for "
    strings:
        $str = "Building a Fast, Free Online Q" ascii wide
    condition:
        any of them
}

Syntax validiert (0 Fehler)

index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("Building a Fast Free Online QR Scanner a")
| stats count earliest(_time) as first_seen latest(_time) as last_seen by src_ip, dest_ip, dest_host, signature
| eval first_seen=strftime(first_seen, "%Y-%m-%d %H:%M:%S"), last_seen=strftime(last_seen, "%Y-%m-%d %H:%M:%S")
| sort - count

Syntax validiert (0 Fehler)

message: "*Building a Fast Free Online QR Scanner a*"

Syntax validiert (0 Fehler)

CommonSecurityLog
| where Message has "Building a Fast Free Online QR Scanner a"
| summarize EventCount = count(), FirstSeen = min(TimeGenerated), LastSeen = max(TimeGenerated) by SourceIP, DestinationIP, DestinationPort, Activity
| extend DetectionRule = "iShareStuff-CTI-Compiled"
| sort by EventCount desc

2. Cyber Threat Intelligence & Forensik

CTI Threat Relationship Graph2 Knoten / 1 Relationen

CVE / Incident Software MITRE ATT&CK CWE Weakness IoC

🎯

MITRE ATT&CK Matrix Navigator 14 Taktiken

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

💡 Tipp: Klicken Sie auf eine TTP, um Gegenmaßnahmen und SIEM-Erkennungsregeln anzuzeigen.Enterprise Matrix v14.1

🚀 Auf tsecurity.de entdecken

◀ VORHERIGER BEITRAG 1 Min

Cyberkriminelle tarnen Ransomware als Interpol-Beweismaterial | SwissCybersecurity.net

IT Security Nachrichten

NÄCHSTER BEITRAG 1 Min

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IT NachrichtenWeiterlesen ▶

Blättern: Pfeiltasten [ ← ] [ → ] · Tasten j / k · mobil: Wischen

Fokus-Vektor:

Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich Building a Fast, Free Online QR Scanner .... Basierend auf 368k Vektor-Korrelationen werden sofortige Isolationsmaßnahmen für betroffene Endpunkte empfohlen.

🛡️ Angriffsfläche & Exposure

Netzwerk/Remote-Zugriff ohne Vorauthentifizierung möglich.

⚡ Empfohlene Sofortmaßnahmen

1. Perimeter-Inspektion: Relevante Portfreigaben und exponierte Endpunkte unverzüglich scannen.
2. Patch-Applikation: Hersteller-Hotfix einspielen oder betroffene Daemons in isolierte DMZ-Segmente überführen.
3. Telemetrie & EDR-Alerts: Prozessaufrufe und Child-Processes auf anomale Shell-Spawns überwachen.

🔗 Semantisch verwandte Zero-Days MariaDB 11.7 VEC

Schnell-Prompts für Analysten

⚠️ DEFANGED SANDBOX VIEW (tsecurity.de): Alle Netzwerkindikatoren und URLs wurden neutralisiert (2 Indikatoren entschärft). Nur zur defensiven Analyse!

Format: python

#!/usr/bin/env python3
# Exploit Title: PoC for Target
import socket, sys
target = '192[.]168[.]1[.]10'
url = 'hxxp://target[.]local/vuln'
s = socket.socket()
s.connect((target, 80))
s.send(b'GET / HTTP/1.1\r\nHost: target.local\r\n\r\n')

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Building a Fast, Free Online QR Scanner and Generator (Open Source)

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Building a Fast, Free Online QR Scanner and Generator (Open Source)

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🛠️ Tech Stack & Features

💡 What I Learned

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SOC Incident Playbook: Remote Code Execution (RCE) Defense

2. Cyber Threat Intelligence & Forensik

MITRE ATT&CK Matrix Navigator 14 Taktiken

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