Indicator Expansion Techniques Tracking Cyber Threats via DNS and Netflow Analysis
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1 Indicator Expansion Techniques Tracking Cyber Threats via DNS and Netflow Analysis United States Computer Emergency Readiness Team (US-CERT) Detection and Analysis January 2011
2 Background As the number or compromises escalates and our visibility into the network grows it becomes imperative to create automated Operational solutions to feed your Computer Network Defense machine. Tracking cyber threats through the coupling of DNS data and netflow analysis allows for a much higher level of confidence in identification of malicious activity.
3 Tools of the Trade The model to be discussed is currently a working concept. The model leverages the following tools Linux Apache MySQL PHP PERL SiLK DNS Tracking DB Various passive DNS feeds
4 Approach An historical archive (repository) of domain/ip address pair with timestamps validated malicious suspicious Unknown Maintain a Master List of vetted malicious domains second level third level fourth and fifth level Run Master List of domains against internal repository Create hash of domain/ip pair
5 Approach Cont... Run Master List of domains against external passive DNS sources Create hash of domain/ip pair Compare lists between external and internal domain/ip pair Comparing the two paired lists is a safe and accurate methodology for quickly identifying new IP addresses and/or new domain/ip address pair Run all the identified IP addresses through external passive DNS sources The final outputs Compared list IP address list domain list domain/ip address/timestamp list
6 Approach Cont... Manual validation of all lists Watch for anomalies (dictionary) run away domain lists (vhosts) push new vetted findings of domains/ip addresses/timestamps to internal repository update master list with new domains
7 Push Domain/IP pair with timestamp to repository Update new domains to Master List 5 1 Seed Master List Query repository of domain/ip pairs Query external pdns feeds 2 IP address file Domain file Domain/IP/Timestamp file Manual Validation Compare paired data sets create list of new domain/ip sightings 4 Reverse lookup of all IP addresses Create list of domains from reverse 3
8 Indicators Expansion Command and Control Infrastructure *.cars.com (badguy Command and Control domain) *.bikes.org (badguy Command and Control domain) (badguy Command and Control IP) (badguy Command and Control IP) (badguy Command and Control IP) (Domain Parking)
9 Indicators Expansion cont wicked.55chevy.cars.com was identified in malware and resolved to on August 6, 2011 Second level domain is registered by Passive DNS research on *.cars.com wicked.55chevy.cars.com wicked.55chevy.cars.com Dynamic88.cars.com GrandPrix.cars.com wicked.55chevy.cars.com wicked.55chevy.cars.com GTO.cars.com mercury.cars.com
10 Indicator Expansion cont Passive DNS research On August 25, 2011 scott.r2addict.bikes.org (new identified domain registered by resolves to IP address scott.r2addict.bikes.org scott.r2addict.bikes.org scott.r2addict.bikes.org scott.r2addict.bikes.org wicked.55chevy.cars.com On September 9, 2011 both scott.r2addict.bikes.org and wicked.55chevy.cars.com resolve to validating a link between the two domains From a single malware sample we now have identified 6 malicious domains, 3 Command and Control IP s and an unusual parking methodology
11 Applying Netflow Current All IP address sets are manually updated and maintained on a SAN using a custom written PERL script called set_manager.pl The script uses several rw SiLK options including but not limited to pmapfilter, rwsetbuild, rwsetintersect A daily cron executes a separate script called ipstore_manager.pl Traffic analysis is conducted typically within a 24 hr period of the creation of the store Domain research is conducted manually and depending on the date of resolution flow traffic analysis could be on activity that is dated
12 Applying Netflow Future To be Integrated in Operational workflow in near future All indicators will be managed in the Indicator DB (to replace Master List) and set_manager.pl DNS Tracking DB content will be accessible through Indicators DB interface Allows for easier domain and IP address set management Scripts can parse and properly bucket IP address sets according to their categorization allowing for more accurate traffic stores
13 Applying Netflow Future Cont Write a wrapper to identify malicious netflow traffic based on the timestamp of domain/ip address pair Spawned from Ed Stoner s work DNS and Flow presentation in 2010 Allows for more accurate and targeted netflow query in automation (reduces false positives)
14 Technical comments or questions US-CERT Security Operations Center Phone: Media inquiries US-CERT Public Affairs Phone: General questions or suggestions US-CERT Information Request Phone: * Information available at
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