Nmap | TryHackMe Walkthrough
An in-depth look at scanning with Nmap, a powerful network scanning tool.
This room was created by DarkStar and MuirlandOracle, as it provides a great way to learn and start practicing nmap. I encourage you to give it a try by yourself since the hands-on practice will give you more understanding of the topic (take advantage of the manual page man nmap).
Task2:
What networking constructs are used to direct traffic to the right application on a server?
Ports
How many of these are available on any network-enabled computer?
65535
[Research] How many of these are considered "well-known"? (These are the "standard" numbers mentioned in the task)
1024
Task3:
What is the first switch listed in the help menu for a 'Syn Scan' (more on this later!)?
-sS
Which switch would you use for a "UDP scan"?
-sU
If you wanted to detect which operating system the target is running on, which switch would you use?
-O
Nmap provides a switch to detect the version of the services running on the target. What is this switch?
-sV
The default output provided by nmap often does not provide enough information for a pentester. How would you increase the verbosity?
-v (you can click v on the keyboard to increase verbosity and Shift+v to decrease it)
Verbosity level one is good, but verbosity level two is better! How would you set the verbosity level to two?
(Note: it's highly advisable to always use at least this option)
-vv
What switch would you use to save the nmap results in three major formats?
-oA
What switch would you use to save the nmap results in a "normal" format?
-oN
A very useful output format: how would you save results in a "grepable" format?
-oG
Sometimes the results we're getting just aren't enough. If we don't care about how loud we are, we can enable "aggressive" mode. This is a shorthand switch that activates service detection, operating system detection, a traceroute and common script scanning.
How would you activate this setting?
-A
Nmap offers five levels of "timing" template. These are essentially used to increase the speed your scan runs at. Be careful though: higher speeds are noisier, and can incur errors!
How would you set the timing template to level 5?
-T5
We can also choose which port(s) to scan.
How would you tell nmap to only scan port 80?
-p 80
How would you tell nmap to scan ports 1000-1500?
-p 1000-1500
A very useful option that should not be ignored:
How would you tell nmap to scan all ports?
-p-
How would you activate a script from the nmap scripting library (lots more on this later!)?
--script
How would you activate all of the scripts in the "vuln" category?
--script=vuln
Task5:
Which RFC defines the appropriate behaviour for the TCP protocol?
RFC 793
If a port is closed, which flag should the server send back to indicate this?
RST
Task6:
There are two other names for a SYN scan, what are they?
Half-Open, Stealth
Can Nmap use a SYN scan without Sudo permissions (Y/N)?
N
Task7:
If a UDP port doesn't respond to an Nmap scan, what will it be marked as?
open|filtered
When a UDP port is closed, by convention the target should send back a "port unreachable" message. Which protocol would it use to do so?
ICMP
Task8:
Which of the three shown scan types uses the URG flag?
xmas
Why are NULL, FIN and Xmas scans generally used?
Firewall Evasion
Which common OS may respond to a NULL, FIN or Xmas scan with a RST for every port?
Microsoft Windows
Task9:
How would you perform a ping sweep on the 172.16.x.x network (Netmask: 255.255.0.0) using Nmap? (CIDR notation)
nmap -sn 172.16.0.0/16
Task10:
What language are NSE scripts written in?
Lua
Which category of scripts would be a very bad idea to run in a production environment?
intrusive
Task11:
What optional argument can the ftp-anon.nse script take?
maxlist
Task12:
Search for "smb" scripts in the /usr/share/nmap/scripts/ directory using either of the demonstrated methods.
What is the filename of the script which determines the underlying OS of the SMB server?
smb-os-discovery.nse
Read through this script. What does it depend on?
smb-brute
Task13:
Which simple (and frequently relied upon) protocol is often blocked, requiring the use of the -Pn switch?
ICMP
[Research] Which Nmap switch allows you to append an arbitrary length of random data to the end of packets?
--data-length
Task14:
Does the target respond to ICMP (ping) requests (Y/N)?
N
Perform an Xmas scan on the first 999 ports of the target -- how many ports are shown to be open or filtered?
999
There is a reason given for this -- what is it?
No Response
Perform a TCP SYN scan on the first 5000 ports of the target -- how many ports are shown to be open?
5
Deploy the ftp-anon script against the box. Can Nmap login successfully to the FTP server on port 21? (Y/N)
Y
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