Sentry42

// blue team · 42 Paris

Infosec student at 42Paris school. Focusing on blue teaming, taste for threat hunting and threat intelligence.

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Write-up

HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy)

An easy challenge from the Holmes CTF that makes us use simplified Threat-intelligence-like platforms to learn more about the threat actor that performed mul...

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ACCESS:

DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4

The third mission to take down the NullVastation organization during a CTF organized by the DGSE and RootMe. This one is about web pentesting.

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DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3

The third mission to take down the NullVastation organization during a CTF organized by the DGSE and RootMe. This one is about digital forensics.

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DGSE-CTF-2025

DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4

The third mission to take down the NullVastation organization during a CTF organized by the DGSE and RootMe. This one is about web pentesting.

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ACCESS:

DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3

The third mission to take down the NullVastation organization during a CTF organized by the DGSE and RootMe. This one is about digital forensics.

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ACCESS:
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RootMe

DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4

The third mission to take down the NullVastation organization during a CTF organized by the DGSE and RootMe. This one is about web pentesting.

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ACCESS:

DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3

The third mission to take down the NullVastation organization during a CTF organized by the DGSE and RootMe. This one is about digital forensics.

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ACCESS:
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SOC

Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses

An article that questions how most teams misuse their metrics or even build them. Find out how this key element is overlooked, which can lead to a waste of m...

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CTI

Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker

An introduction to the art of luring attackers into traps to strengthen defenses and gather intelligence on their tactics.

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ACCESS:

HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy)

An easy challenge from the Holmes CTF that makes us use simplified Threat-intelligence-like platforms to learn more about the threat actor that performed mul...

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ACCESS:
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Welcome

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AI

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Log analysis

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Forensics

DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3

The third mission to take down the NullVastation organization during a CTF organized by the DGSE and RootMe. This one is about digital forensics.

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ACCESS:
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Traffic analysis

DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3

The third mission to take down the NullVastation organization during a CTF organized by the DGSE and RootMe. This one is about digital forensics.

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Malware analysis

DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3 DGSE CTF 2025 - Mission 3

The third mission to take down the NullVastation organization during a CTF organized by the DGSE and RootMe. This one is about digital forensics.

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ACCESS:
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Web pentesting

DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4

The third mission to take down the NullVastation organization during a CTF organized by the DGSE and RootMe. This one is about web pentesting.

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Privilege escalation

DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4 DGSE CTF 2025 - Mission 4

The third mission to take down the NullVastation organization during a CTF organized by the DGSE and RootMe. This one is about web pentesting.

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ACCESS:
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Holmes-CTF-2025

HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy)

An easy challenge from the Holmes CTF that makes us use simplified Threat-intelligence-like platforms to learn more about the threat actor that performed mul...

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HTB

HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy) HTB Holmes CTF 2025 - The Card (easy)

An easy challenge from the Holmes CTF that makes us use simplified Threat-intelligence-like platforms to learn more about the threat actor that performed mul...

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ACCESS:
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CyberDeception

Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker

An introduction to the art of luring attackers into traps to strengthen defenses and gather intelligence on their tactics.

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ACCESS:
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OODA Loop

Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker Intro to cyber deception : trapping the attacker

An introduction to the art of luring attackers into traps to strengthen defenses and gather intelligence on their tactics.

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ACCESS:
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Metrics

Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses

An article that questions how most teams misuse their metrics or even build them. Find out how this key element is overlooked, which can lead to a waste of m...

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Bias

Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses Blue Team Metrics: Honest Numbers, Dishonest Uses

An article that questions how most teams misuse their metrics or even build them. Find out how this key element is overlooked, which can lead to a waste of m...

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ACCESS:
Back to Top ↑