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JavaScript Tutorial Series: Practice 1

In this post we're going to use everything we learned by solving exercises. I will not provide the solution to the exercises simply because they can be found online. Do keep in mind that, copying and pasting will not be in your favor…

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In this post we're going to use everything we learned by solving exercises. I will not provide the solution to the exercises simply because they can be found online. Do keep in mind that, copying and pasting will not be in your favor simply because it won't be beneficial to you.



Try on your own first, and keep trying, do not look the solutions up unless you've spend some time on these exercises.

If you feel stuck you can use the previous lessons as repertoire.






Exercise 1



Write a function that returns the largest number between three that you will provide when calling it. Print the answer in the console.






Exercise 2



Write a function that returns the third character in a string. print this character to the console.






Exercise 3



Without using the console, what is the output of these?



  • let numbers = [3, 5, 8, 9, 12, 67];
    let newArr = numbers.slice(1, 4);


function myFunc() {
let a = 7;
console.log(a);
}
console.log(a);







  • write a function that returns the length of a string you will pass as argument and print it in the console.


  • write a program that joins two string in two different ways.


  • Write a function that returns the the string with the largest length. and print it to the console.


These exercises are very easy! good luck!

1. Sofort-Triage & Abwehrmaßnahmen

SOC Incident Playbook: Vulnerability Remediation & Verification
Syntax validiert (0 Fehler)
title: Detect Exploitation - JavaScript Tutorial Series: Practice 1
id: 974631e4-3935-4de8-a856-81d45295536a
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
  - https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-25
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 = "2026-09-25"
        description = "YARA Signature for "
    strings:
        $str = "JavaScript Tutorial Series: Pr" ascii wide
    condition:
        any of them
}
Syntax validiert (0 Fehler)
index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("JavaScript Tutorial Series Practice 1")
| 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: "*JavaScript Tutorial Series Practice 1*"
Syntax validiert (0 Fehler)
CommonSecurityLog
| where Message has "JavaScript Tutorial Series Practice 1"
| 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

🎯
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
tsecurity.de Cognitive Threat RAG
Fokus-Vektor:

Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich JavaScript Tutorial Series: Practice 1.... 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.
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