Cct2019 Tryhackme (Android QUICK)

The CCT2019 room on TryHackMe is a multi-task CTF designed for the U.S. Navy Cyber Competition Team 2019, focusing on networking, reverse engineering, forensics, and cryptography. 1. Task 1: pcap1 (PCAP Analysis) Goal: Analyze a network traffic capture file.

Approach: Use Wireshark or tcpdump to inspect the provided .pcap file.

Key Skills: Look for HTTP traffic, extracted files (File > Export Objects > HTTP), and cleartext credentials.

Tip: Focus on pcap-related skills and ensure you recover the first file in its entirety to avoid getting stuck on later steps. 2. Task 2: re3 (Reverse Engineering) Goal: Reverse-engineer a binary file to find a flag.

Approach: Use tools like file, strings, ltrace, strace, or disassemblers like Ghidra to analyze the provided binary.

Key Skills: Identifying main functions, analyzing function calls, and understanding how user input is processed. 3. Task 3: for1 (Forensics) Goal: Forensics investigation to find a hidden flag.

Approach: Use forensics tools like binwalk (for extracting files from within other files), stegseek or steghide (for steganography), or file signatures analysis.

Tip: If you are doing intense reverse engineering for a for-task, you might be in a rabbit hole; look for embedded files first. 4. Task 4: crypto1 (Cryptography) Goal: Decrypt a message to obtain the flag.

Approach: Identify the encryption type (e.g., XOR, Caesar, AES).

Key Tip: For this specific challenge, the key is the name of a keyboard layout. Enter the layout name three times (concatenated) in lowercase. General CCT2019 Strategy

Read Carefully: The prompt warns that red herrings are included, but you can stay on track by focusing on fundamental skills for each task type.

File Analysis: A major part of the challenge is recovering clues from provided files (pcap, binaries) to progress to the next step. cct2019 tryhackme

Tools: Be familiar with Wireshark, binwalk, strings, and Ghidra.

If you are stuck on a specific task, let me know which one (pcap1, re3, for1, or crypto1) and I can provide more specific steps. TryHackMe_and_HackTheBox/CCT2019.md at master - GitHub

a collection of legacy challenges from the 2019 US Navy Cyber Competition Team (CCT) assessment, sponsored by the US TENTH Fleet

. The room is categorized as "Insane" difficulty and focuses on advanced cybersecurity skills across multiple domains. Challenge Overview Difficulty: Estimated Completion Time: 180 minutes Target Audience: Advanced security professionals and CTF players Primary Categories: Forensics: In-depth analysis of packet captures ( ) and memory dumps. Reverse Engineering:

Analyzing binaries, such as .NET applications, to find hidden logic or hex blobs. Networking:

Complex Wireshark analysis requiring significant out-of-the-box thinking. Key Tasks & Methodology

The room is structured as a series of independent tasks, each simulating a different aspect of a professional assessment: Network Analysis (Wireshark):

One of the most challenging segments involves a deep dive into network traffic to identify anomalies. Expert walkthroughs, like those by David Mohan on LinkedIn

, highlight this as one of the hardest Wireshark-based challenges on the platform. Reversing (.NET Challenges): Specific tasks, such as

, require users to decompile .NET executables using tools like

to find specific 32-character hex blobs rather than standard flags. Operational Scenarios: The CCT2019 room on TryHackMe is a multi-task

The challenges are designed to test real-world technical proficiency rather than "boot-to-root" style exploitation found in easier rooms. Learning Outcomes

Completing this room demonstrates a high level of competency in: traffic analysis and finding needles in large data haystacks. Decompiling and debugging compiled binaries to understand internal logic. forensic methodology to compromised systems to trace attacker activity. or tool like used in this room? CCT2019 - TryHackMe

The "helpful feature" referenced in the CCT2019 TryHackMe challenge is a script found within one of the analysis tasks that automates the decryption of a Rail Fence Cipher.

In the context of the room's forensic and traffic analysis challenges, users typically encounter a Python script or function (often named railNumber or decrypt) designed to decode intercepted messages by calculating the correct rail position for each character in a ciphertext. Key Components of the Feature

railNumber Function: Automatically determines the rail index for a character based on its position, total rails, and a specific offset.

Modular Arithmetic: Uses mathematical logic to handle the "zigzag" nature of the Rail Fence Cipher, which is often difficult to decode manually.

Automated Decryption: Iterates through each rail to reconstruct the plaintext from what otherwise looks like randomized ciphertext.

This room is generally categorized as "Insane" difficulty due to its complex PCAP analysis and the requirement for "out of the box" thinking to identify these types of scripts and patterns within network traffic.

For a step-by-step walkthrough of the CCT2019 challenge and how these scripts are applied, you can watch this video: TryHackMe #702 CCT2019 (Insane) Adamski CTF YouTube• Apr 1, 2024 TryHackMe_and_HackTheBox/CCT2019.md at master - GitHub

I just wrapped up CCT2019, and it was a refreshing change of pace from the standard "capture the flag" format. These challenges were originally designed for the U.S. Navy Cyber Competition Team, and the shift in focus from speed to methodology was clear. Found directories:

This room doesn't just ask "can you find the flag?"—it asks "can you prove your findings?" Key Takeaways & Skills Tested:

Deep PCAP Analysis: Navigating complex traffic captures with intentional "rabbit holes" designed to mislead.

Traffic Reconstruction: Moving beyond automated tools to manually recover payloads from raw captures.

Reverse Engineering: Analyzing binary execution logic to understand how a program works, rather than just extracting strings.

Forensics & Layered Crypto: Solving multi-stage puzzles where the output of one step is the vital key for the next.

The "Zero Trust" MindsetThe most valuable part of this room was the requirement to question every artifact. Nothing was taken at face value; every piece of evidence had to be validated and tied back to a logical chain of reasoning—exactly how real-world digital forensics and incident response (DFIR) investigations operate.

Huge thanks to TryHackMe for hosting these legacy Navy challenges. If you're looking to test your analytical patience, I highly recommend giving this one a go.

#CyberSecurity #TryHackMe #CCT2019 #BlueTeam #DigitalForensics #USNavy #Pentesting

Directory brute-forcing (using gobuster or dirb):

gobuster dir -u http://<target_ip>:8080 -w /usr/share/wordlists/dirb/common.txt

Found directories:

• /admin
• /backup
• /uploads
• /console

Prerequisites

• Basic Linux command line familiarity.
• Familiarity with enumeration tools: nmap, gobuster, curl, wget.
• Basic knowledge of web vulnerabilities and SSH.
• Optional: experience with Burp Suite or similar for web testing.

Expected Results:

• Port 22: OpenSSH (typically version 7.x)
• Port 80: Apache HTTP Server (running a custom web application)
• Port 8080: Another HTTP service (often a vulnerable Jenkins or Tomcat)

6. Third Flag – DNS Exfiltration

• Filter DNS queries: dns.qry.name
  • Long subdomains (e.g., FLAG3....malicious.com).
• Extract unique subdomains:
  tshark -r CCT2019.pcap -Y "dns.qry.type == 1" -T fields -e dns.qry.name | sort -u
• Reassemble flag from subdomain parts.
  • Example: flag3dns_exfil_4ttack.

Overview

CCT2019 is a TryHackMe challenge focused on capture-the-flag style web and network exploitation tasks from the 2019 Capture the Flag competition. The room (or walkthrough) guides users through enumeration, vulnerability identification, exploitation, privilege escalation, and post‑exploitation analysis. This report summarizes objectives, methodology, findings, exploit steps, and mitigation recommendations.

5. Second Flag – HTTP Steganography

• Filter HTTP: http.request
  • One suspicious POST request to /upload with a JPEG image.
• Export HTTP object: Wireshark → File → Export Objects → HTTP → save secret.jpg.
• Analyze image:
  exiftool secret.jpg → comment field contains base64.
  steghide extract -sf secret.jpg (no passphrase) → extracts flag2.txt.
  • Contents: flaghttp_ steganography_ done.

Study & Practice Tips

• Recreate each step manually rather than relying on automated scripts—this builds intuition.
• Keep notes: commands used, files discovered, and credentials found.
• If stuck, search for specific error messages or service banners instead of brute-forcing.
• After finishing, repeat the room aiming for faster enumeration and cleaner documentation.