Network Forensics Puzzle Contest #8 posed a serious challenge, requiring contestants to demonstrate an advanced knowledge of protocols and meticulous attention to detail. Thank you to everyone who submitted an entry for Puzzle #8, and a special congratulations to the relatively small number of folks who submitted correct answers.

The winner of this contest is…Stefan S. Op de Beek ! Stefan wins a Buffalo Wireless Router for his correct answers and UTScapy test script. While the script didn’t work perfectly on my system, it is a great example of leveraging existing frameworks to analyze packet captures. Contestants, answers, and solutions below.

Contestants:
Joerg Gerschuetz
Winter Faulk
Aaron Wamapch
Kazunori Kojima
Adam Jenkins
Steeve Barbeau
Tyler Dean
Ward Perry
J-Michael Roberts
Anthony
Stefan S. of de Beek

Answers:
1) Joe’s WAP is beaconing. Based on the contents of the packet capture, what are the SSID and BSSID of his access point?
SSID: Ment0rNet
BSSID: 00:23:69:61:00:d0

2) How long is the packet capture, from beginning to end (in SECONDS – please round to the nearest full second)?
A: 414s

3) How many WEP-encrypted data frames are there total in the packet capture?
$ tshark -r evidence08.pcap -R ‘((wlan.fc.type_subtype == 0x20) && (wlan.fc.protected == 1)) && (wlan.bssid == 00:23:69:61:00:d0)’|wc -l
A: 59274

4) How many *unique* WEP initialization vectors (IVs) are there TOTAL in the packet capture relating to Joe’s access point?
$ tshark -r evidence08.pcap -R ‘(wlan.bssid == 00:23:69:61:00:d0) && wlan.wep.iv’ -T fields -e wlan.wep.iv | sort -u | wc -l
A: 29719

5) What was the MAC address of the station executing the Layer 2 attacks?
A: 1c:4b:d6:69:cd:07

6) How many *unique* IVs were generated (relating to Joe’s access point):
a) By the attacker station?
$ tshark -r evidence08.pcap -R ‘(wlan.bssid == 00:23:69:61:00:d0) && (wlan.sa == 1c:4b:d6:69:cd:07) && wlan.wep.iv’ -T fields -e wlan.wep.iv|sort -u|wc -l
A: 14133 (14132 also accepted)

b) By all *other* stations combined?
$ tshark -r evidence08.pcap -R ‘(wlan.bssid == 00:23:69:61:00:d0) && (wlan.sa != 1c:4b:d6:69:cd:07) && wlan.wep.iv’ -T fields -e wlan.wep.iv|sort -u|wc -l
B : 15587

7) What was the WEP key of Joe’s WAP?
$ aircrack-ng -b 00:23:69:61:00:d0 evidence08.pcap
A: D0:E5:9E:B9:04

8.) What were the administrative username and password of the targeted wireless access point?
username: admin
passphrase: admin

9) What was the WAP administrative passphrase changed to?
passphrase: hahp0wnedJ00