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⚡ tsecurity.de Intelligence

Commandline/sysadmin course via Reddit - r/linuxupskillchallnge

This is a month-long challenge for anyone wanting to build Linux sysadmin skills that I launched via a post here two months ago. "Daily lessons appear in the sub-reddit /r/linuxupskillchallenge - which is also be used for…

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This is a month-long challenge for anyone wanting to build Linux sysadmin skills that I launched via a post here two months ago.

"Daily lessons appear in the sub-reddit /r/linuxupskillchallenge - which is also be used for support/discussion. This is a 'rolling' course repeated each month. Does require some serious commitment, but if gaining/growing these skills was one of your New Years Resolutions, then you now have no excuse! " 

The course, in /r/linuxupskillchallenge, is about to 'reset' and start from the beginning again on Monday 6 April, so plenty of time to get yourself organised if you're up for the challenge. Subscribe to the subreddit, and read the "Day 0" posts there.

It's now run for two months:

  • Participants? Well, 77 people subscribed to the subreddit for the first month - 599 for the second. Will be very interesting to see how we go in April with so many people being on some sort of lockdown or WFH.

  • Feedback has been positive, and I think that the key feature - we're working on a "real server", remote and exposed to the internet - helps in building a "sysadmin mindset".

  • Lesson "rollover". Leaving just five lessons "up" at a time has been a bit controversial but for April I'll again run it the same way, as this is a pretty core part of the concept. Note that the raw content is all available at https://github.com/snori74/linuxupskillchallenge

  • Automation? The "magic" that makes a new lesson appear and the oldest lesson disappear still depends entirely on me getting out of bed and doing it every morning! Working on making a little Python bot however.

submitted by /u/snori74
[link] [comments]

1. Sofort-Triage & Abwehrmaßnahmen

SOC Incident Playbook: Vulnerability Remediation & Verification
Syntax validiert (0 Fehler)
title: Detect Exploitation - Commandline/sysadmin course via Reddit - r/linuxupskillchallnge
id: d00ab5c7-a28c-45de-ba98-c5757d54a44f
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 = "Commandline/sysadmin course vi" ascii wide
    condition:
        any of them
}
Syntax validiert (0 Fehler)
index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("Commandlinesysadmin course via Reddit - ")
| 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: "*Commandlinesysadmin course via Reddit - *"
Syntax validiert (0 Fehler)
CommonSecurityLog
| where Message has "Commandlinesysadmin course via Reddit - "
| 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 Graph3 Knoten / 2 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
tsecurity.de Cognitive Threat RAG
Fokus-Vektor:

Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich Commandline/sysadmin course via Reddit -.... 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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