ターゲット // Billyboss
PlatformOffSec Proving Grounds
OSWindows
DifficultyMedium
IP192.168.134.61

Enumeration

Nmap

The two ports that matter — a Nexus web service and SMB:

▶ Nmap output
PORT     STATE SERVICE       VERSION
445/tcp  open  microsoft-ds
8081/tcp open  http          Sonatype Nexus Repository Manager OSS 3.21.0-05

A Windows host with a web service on port 8081 — Sonatype Nexus Repository Manager OSS 3.21.0-05. SMB (445) is also exposed, which becomes relevant for privilege escalation later.