Skip to main content

HTB : First Contact Writeup



This challenge is highly unique because it bypasses standard application bugs or privilege escalation vectors. Instead, it places you directly inside the virtual shoes of a ground station operator, requiring a clean mix of raw network script interaction and astronomical dataset propagation.

The Anatomy of the Challenge Input

When connecting to the live instance socket, you are instantly handed two distinct elements:

  • Ground Station Telemetry: Precise floating point geographic variables representing the exact Latitude, Longitude, and elevation of a tracking array.
  • Two-Line Element (TLE) Set: The industry standard data format mapping out the specific orbital elements of the target spacecraft, including inclination, eccentricity, and argument of perigee at a fixed point in time.

The Technical Hurdle: Time Windows and Cutoff Thresholds

The server demands a space separated list of precise ISO timestamps mapping out every single rise and set event window where the satellite is physically visible over the designated tracking station for the next 24 hours. To make matters more complex, a strict constraint is applied: the spacecraft is only considered visible when its elevation angle clears a designated degree threshold relative to the local horizon floor.

ℹ️ Why manual calculations fail: Satellites do not follow perfectly linear paths across a 2D map. Factors like Earth's oblate spheroidal geometry and shifting orbital speed mean you must run real time SGP4 math algorithms to match the server's tracking calendar.

Building an Automated Script Workflow

Solving this challenge without timing out requires structured script automation:

  1. Stream Capture: Establish a raw TCP socket client that reads the variable prompt buffer dynamically without hanging on custom keywords.
  2. Data Extraction: Deploy regular expressions to isolate the numeric coordinates and strip out the exact text blocks of the Two-Line Element lines.
  3. Epoch Realignment: Instantiate an orbital engine wrapper using libraries like Python's skyfield or sgp4, ensuring the tracking loop anchors precisely to the satellite's embedded internal time line.
  4. Multi-Stage Looping: The challenge immediately rotates to a new target satellite as soon as you submit a correct answer, meaning your engine must run in a persistent connection loop until the final flag prints.

🚀 Unlock the Multi-Stage Automation Blueprint

Access the complete production grade Python automation script. The guide covers zero dependency socket streaming logic, resilient text parsing models, and the full multi stage loop configuration needed to conquer every satellite phase instantly.

☕ Access Full Technical Writeup

Comments

Post a Comment

Express your opinion

Popular posts from this blog

Reverse Domain Naming as an Identity Scheme: Uniqueness Without Governance

  Introduction Reverse domain name notation writing identifiers like com.example.app instead of app.example.com has become a de facto standard for naming software packages and applications. This convention is pervasive across programming ecosystems and platforms, from Java class packages to Android app IDs and iOS bundle identifiers. It was adopted to ensure global uniqueness and avoid naming collisions without requiring a central authority. However, reverse-DNS naming was never backed by formal regulation or ownership verification . In practice, any developer can choose any reverse domain string for their software, regardless of whether they own that Internet domain. This gap between implied and actual ownership creates security and trust challenges that attackers can exploit. Threat model:   Adversaries can abuse the assumed trust in domain-based names by impersonating brands or organizations in their identifiers. For example, a malicious Android app could declare a packa...
Post a Comment
Read more

HTB Touch - Full Writeup (Easy Windows, Season 12)

Buy Me a Coffee Enjoying the writeup? Support the work. Season 12, Easy Windows. Finished it in an evening. Learned more than I expected. I finished the Touch machine on Hack The Box last night. It is rated Easy, and honestly, it earns that rating. There is no memory corruption, no exotic bug, no clever bypass that makes you feel like a wizard. What it has instead is a chain of small, believable mistakes that stack on top of each other until you are sitting on a SYSTEM shell wondering how you got there. That is why I wanted to write about it. Not because the box is hard, but because it is real. The Setup Touch is a Windows box themed around an airport. It picks up a thread from the earlier Layover machine, where you uncover a passenger name and a booking reference that you then reuse here. That small continuity detail is a nice touch, and it mirrors how real attackers actually operate. They rare...
Post a Comment
Read more

Android vs iPhone Security: Why No System is 100% Secure

When I went to the CYBERUS Spring School in early April 2025 (April 7–11, 2025, at Université Bretagne Sud in Lorient, France), one of the topics we talked about was the age old query: Which phone is safer, the  iPhone or the  Android ? The conversations were instructive to me as a security enthusiast. We discussed technical ideas like mobile app sandboxing and even how two apps from the same developer could access data in spite of platform security measures. The discussions underlined an important realization I've had over the years: while IOS and Android both have robust security mechanisms, neither is completely impenetrable. In this essay, I'll provide a professional (but hopefully easy-to-read) analysis of Android vs iPhone security, interspersed with my own viewpoints, demonstrating why no system can claim perfect security. Security by Design: IOS and Android Approaches Apple's IOS and Google's Android have fundamentally different approa...
Post a Comment
Read more