Veilcat

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Service Discovery

2 min read

Initial Setup & Information Gathering

Host Information

Target IP: 192.168.110.23
Operating System: Linux (Ubuntu 4ubuntu0.7)
Difficulty: Easy

Environment Variables / Setup

export IP=192.168.110.23
mkdir $IP && cd $IP
mkdir {nmap,web,smb,ftp,exploit,loot}

Phase 1: Port Discovery

autorecon $IP --only-scans-dir

PORT   STATE SERVICE REASON         VERSION
22/tcp open  ssh     syn-ack ttl 61 OpenSSH 8.2p1 Ubuntu 4ubuntu0.7 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey: 
|   3072 62:36:1a:5c:d3:e3:7b:e1:70:f8:a3:b3:1c:4c:24:38 (RSA)
| ssh-rsa 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
|   256 ee:25:fc:23:66:05:c0:c1:ec:47:c6:bb:00:c7:4f:53 (ECDSA)
| ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBNBWjceIJ9NSOLk8zk68zCychWoLxrcrsuJYy2C1pvpfOhVBrr8QBhYbJxzzGJ7DpuMT/DXiCwuLXdu0zeR4/Dk=
|   256 83:5c:51:ac:32:e5:3a:21:7c:f6:c2:cd:93:68:58:d8 (ED25519)
|_ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIG3LJwn9us7wxvkL0E6EEgOPG3P0fa0fRVuJuXeASZvs
80/tcp open  http    syn-ack ttl 61 Apache httpd 2.4.41 ((Ubuntu))
| http-cookie-flags: 
|   /: 
|     PHPSESSID: 
|_      httponly flag not set
|_http-server-header: Apache/2.4.41 (Ubuntu)
| http-methods: 
|_  Supported Methods: GET HEAD POST OPTIONS
|_http-title: All topics | CODOLOGIC
Warning: OSScan results may be unreliable because we could not find at least 1 open and 1 closed port
Device type: general purpose|router
Running (JUST GUESSING): Linux 4.X|5.X|2.6.X|3.X (97%), MikroTik RouterOS 7.X (95%)
OS CPE: cpe:/o:linux:linux_kernel:4 cpe:/o:linux:linux_kernel:5 cpe:/o:mikrotik:routeros:7 cpe:/o:linux:linux_kernel:5.6.3 cpe:/o:linux:linux_kernel:2.6 cpe:/o:linux:linux_kernel:3
OS fingerprint not ideal because: Missing a closed TCP port so results incomplete
Aggressive OS guesses: Linux 4.15 - 5.19 (97%), Linux 5.0 - 5.14 (97%), MikroTik RouterOS 7.2 - 7.5 (Linux 5.6.3) (95%), Linux 2.6.32 - 3.13 (91%), Linux 3.2 - 4.14 (91%), Linux 2.6.32 - 3.10 (90%), Linux 4.19 - 5.15 (90%), Linux 3.10 - 4.11 (89%), Linux 3.4 - 3.10 (89%), Linux 4.15 (89%)
No exact OS matches for host (test conditions non-ideal).
TCP/IP fingerprint:
SCAN(V=7.95%E=4%D=8/19%OT=22%CT=%CU=%PV=Y%DS=4%DC=T%G=N%TM=68A48385%P=x86_64-pc-linux-gnu)
SEQ(SP=101%GCD=1%ISR=10F%TI=Z%TS=A)
SEQ(SP=F8%GCD=1%ISR=108%TI=Z%TS=A)
OPS(O1=M578ST11NW7%O2=M578ST11NW7%O3=M578NNT11NW7%O4=M578ST11NW7%O5=M578ST11NW7%O6=M578ST11)
WIN(W1=FE88%W2=FE88%W3=FE88%W4=FE88%W5=FE88%W6=FE88)
ECN(R=Y%DF=Y%TG=40%W=FAF0%O=M578NNSNW7%CC=Y%Q=)
T1(R=Y%DF=Y%TG=40%S=O%A=S+%F=AS%RD=0%Q=)
T2(R=N)
T3(R=N)
T4(R=Y%DF=Y%TG=40%W=0%S=A%A=Z%F=R%O=%RD=0%Q=)
U1(R=N)
IE(R=Y%DFI=N%TG=40%CD=S)

Uptime guess: 20.976 days (since Tue Jul 29 07:34:44 2025)
Network Distance: 4 hops
TCP Sequence Prediction: Difficulty=257 (Good luck!)
IP ID Sequence Generation: All zeros
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

TRACEROUTE (using port 22/tcp)
HOP RTT      ADDRESS
1   87.44 ms 192.168.45.1
2   87.42 ms 192.168.45.254
3   87.47 ms 192.168.251.1
4   87.61 ms 192.168.110.23

Manual Scanning

UDP Top Ports

# UDP scan is ESSENTIAL - many fail OSCP by skipping this
nmap -sU --top-ports 100 -T4 -Pn $IP -oA nmap/top_udp

(No common UDP ports are open )

Phase 2: Service Enumeration Priority

Based on discovered services, follow this priority order:

Critical Services (Immediate Focus)

  • SSH (22) - Version enum, weak creds → 22 SSH
  • HTTP/HTTPS (80/443) - Web apps, content discovery → 80,443 HTTP

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