Pcap Inspection
Learn & practice AWS Hacking:
HackTricks Training AWS Red Team Expert (ARTE)
Learn & practice GCP Hacking: 
HackTricks Training GCP Red Team Expert (GRTE)
RootedCON is the most relevant cybersecurity event in Spain and one of the most important in Europe. With the mission of promoting technical knowledge, this congress is a boiling meeting point for technology and cybersecurity professionals in every discipline.
Online tools for pcaps
If the header of your pcap is broken you should try to fix it using: http://f00l.de/hacking/pcapfix.php
Extract information and search for malware inside a pcap in PacketTotal
Search for malicious activity using www.virustotal.com and www.hybrid-analysis.com
Full pcap analysis from the browser in https://apackets.com/
Extract Information
The following tools are useful to extract statistics, files, etc.
Wireshark
You can find some Wireshark tricks in:
Wireshark tricksPcap analysis from the browser.
Xplico Framework
Xplico (only linux) can analyze a pcap and extract information from it. For example, from a pcap file Xplico, extracts each email (POP, IMAP, and SMTP protocols), all HTTP contents, each VoIP call (SIP), FTP, TFTP, and so on.
Install
sudo bash -c 'echo "deb http://repo.xplico.org/ $(lsb_release -s -c) main" /etc/apt/sources.list'
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 791C25CE
sudo apt-get update
sudo apt-get install xplicoRun
/etc/init.d/apache2 restart
/etc/init.d/xplico startAccess to 127.0.0.1:9876 with credentials xplico:xplico
Then create a new case, create a new session inside the case and upload the pcap file.
NetworkMiner
Like Xplico it is a tool to analyze and extract objects from pcaps. It has a free edition that you can download here. It works with Windows. This tool is also useful to get other information analysed from the packets in order to be able to know what was happening in a quicker way.
NetWitness Investigator
You can download NetWitness Investigator from here (It works in Windows). This is another useful tool that analyses the packets and sorts the information in a useful way to know what is happening inside.
Extracting and encoding usernames and passwords (HTTP, FTP, Telnet, IMAP, SMTP...)
Extract authentication hashes and crack them using Hashcat (Kerberos, NTLM, CRAM-MD5, HTTP-Digest...)
Build a visual network diagram (Network nodes & users)
Extract DNS queries
Reconstruct all TCP & UDP Sessions
File Carving
Capinfos
capinfos capture.pcapNgrep
If you are looking for something inside the pcap you can use ngrep. Here is an example using the main filters:
ngrep -I packets.pcap "^GET" "port 80 and tcp and host 192.168 and dst host 192.168 and src host 192.168"Carving
Using common carving techniques can be useful to extract files and information from the pcap:
File/Data Carving & Recovery ToolsCapturing credentials
You can use tools like https://github.com/lgandx/PCredz to parse credentials from a pcap or a live interface.
RootedCON is the most relevant cybersecurity event in Spain and one of the most important in Europe. With the mission of promoting technical knowledge, this congress is a boiling meeting point for technology and cybersecurity professionals in every discipline.
Check Exploits/Malware
Suricata
Install and setup
apt-get install suricata
apt-get install oinkmaster
echo "url = http://rules.emergingthreats.net/open/suricata/emerging.rules.tar.gz" >> /etc/oinkmaster.conf
oinkmaster -C /etc/oinkmaster.conf -o /etc/suricata/rulesCheck pcap
suricata -r packets.pcap -c /etc/suricata/suricata.yaml -k none -v -l logYaraPcap
YaraPCAP is a tool that
Reads a PCAP File and Extracts Http Streams.
gzip deflates any compressed streams
Scans every file with yara
Writes a report.txt
Optionally saves matching files to a Dir
Malware Analysis
Check if you can find any fingerprint of a known malware:
Malware AnalysisZeek
Zeek is a passive, open-source network traffic analyzer. Many operators use Zeek as a Network Security Monitor (NSM) to support investigations of suspicious or malicious activity. Zeek also supports a wide range of traffic analysis tasks beyond the security domain, including performance measurement and troubleshooting.
Basically, logs created by zeek aren't pcaps. Therefore you will need to use other tools to analyse the logs where the information about the pcaps are.
Connections Info
#Get info about longest connections (add "grep udp" to see only udp traffic)
#The longest connection might be of malware (constant reverse shell?)
cat conn.log | zeek-cut id.orig_h id.orig_p id.resp_h id.resp_p proto service duration | sort -nrk 7 | head -n 10
10.55.100.100 49778 65.52.108.225 443 tcp - 86222.365445
10.55.100.107 56099 111.221.29.113 443 tcp - 86220.126151
10.55.100.110 60168 40.77.229.82 443 tcp - 86160.119664
#Improve the metrics by summing up the total duration time for connections that have the same destination IP and Port.
cat conn.log | zeek-cut id.orig_h id.resp_h id.resp_p proto duration | awk 'BEGIN{ FS="\t" } { arr[$1 FS $2 FS $3 FS $4] += $5 } END{ for (key in arr) printf "%s%s%s\n", key, FS, arr[key] }' | sort -nrk 5 | head -n 10
10.55.100.100 65.52.108.225 443 tcp 86222.4
10.55.100.107 111.221.29.113 443 tcp 86220.1
10.55.100.110 40.77.229.82 443 tcp 86160.1
#Get the number of connections summed up per each line
cat conn.log | zeek-cut id.orig_h id.resp_h duration | awk 'BEGIN{ FS="\t" } { arr[$1 FS $2] += $3; count[$1 FS $2] += 1 } END{ for (key in arr) printf "%s%s%s%s%s\n", key, FS, count[key], FS, arr[key] }' | sort -nrk 4 | head -n 10
10.55.100.100 65.52.108.225 1 86222.4
10.55.100.107 111.221.29.113 1 86220.1
10.55.100.110 40.77.229.82 134 86160.1
#Check if any IP is connecting to 1.1.1.1
cat conn.log | zeek-cut id.orig_h id.resp_h id.resp_p proto service | grep '1.1.1.1' | sort | uniq -c
#Get number of connections per source IP, dest IP and dest Port
cat conn.log | zeek-cut id.orig_h id.resp_h id.resp_p proto | awk 'BEGIN{ FS="\t" } { arr[$1 FS $2 FS $3 FS $4] += 1 } END{ for (key in arr) printf "%s%s%s\n", key, FS, arr[key] }' | sort -nrk 5 | head -n 10
# RITA
#Something similar can be done with the tool rita
rita show-long-connections -H --limit 10 zeek_logs
+---------------+----------------+--------------------------+----------------+
| SOURCE IP | DESTINATION IP | DSTPORT:PROTOCOL:SERVICE | DURATION |
+---------------+----------------+--------------------------+----------------+
| 10.55.100.100 | 65.52.108.225 | 443:tcp:- | 23h57m2.3655s |
| 10.55.100.107 | 111.221.29.113 | 443:tcp:- | 23h57m0.1262s |
| 10.55.100.110 | 40.77.229.82 | 443:tcp:- | 23h56m0.1197s |
#Get connections info from rita
rita show-beacons zeek_logs | head -n 10
Score,Source IP,Destination IP,Connections,Avg Bytes,Intvl Range,Size Range,Top Intvl,Top Size,Top Intvl Count,Top Size Count,Intvl Skew,Size Skew,Intvl Dispersion,Size Dispersion
1,192.168.88.2,165.227.88.15,108858,197,860,182,1,89,53341,108319,0,0,0,0
1,10.55.100.111,165.227.216.194,20054,92,29,52,1,52,7774,20053,0,0,0,0
0.838,10.55.200.10,205.251.194.64,210,69,29398,4,300,70,109,205,0,0,0,0DNS info
#Get info about each DNS request performed
cat dns.log | zeek-cut -c id.orig_h query qtype_name answers
#Get the number of times each domain was requested and get the top 10
cat dns.log | zeek-cut query | sort | uniq | rev | cut -d '.' -f 1-2 | rev | sort | uniq -c | sort -nr | head -n 10
#Get all the IPs
cat dns.log | zeek-cut id.orig_h query | grep 'example\.com' | cut -f 1 | sort | uniq -c
#Sort the most common DNS record request (should be A)
cat dns.log | zeek-cut qtype_name | sort | uniq -c | sort -nr
#See top DNS domain requested with rita
rita show-exploded-dns -H --limit 10 zeek_logsOther pcap analysis tricks
DNSCat pcap analysisWifi Pcap AnalysisUSB Keystrokes
RootedCON is the most relevant cybersecurity event in Spain and one of the most important in Europe. With the mission of promoting technical knowledge, this congress is a boiling meeting point for technology and cybersecurity professionals in every discipline.
Learn & practice AWS Hacking:HackTricks Training AWS Red Team Expert (ARTE)
Learn & practice GCP Hacking: HackTricks Training GCP Red Team Expert (GRTE)
Last updated