Great Firewall & Great cannon

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Investigation about the Chinese Great Cannon and information about Great Firewall as introduction. Deny of Service attack to Github repositories. This repositories contain information about how can broke the Great Firewall

Technology

The Great Firewall &
The Great Cannon
1
Ivan Ortega
@ivanortegaalba
Slides:
http://es.slideshare.net/IvanOrtega14
1

China and their censure policy
Until now China has been using its system:
Great Firewall
a part of
Golden Shield Project
3

Great Firewall
30.000 - 50.000 police agents involved.
800.000.000 $ invested
8 years
All this to censor the
Internet as we know it
4

How do Great Firewall block sites?
1. The Great Firewall search in DNS servers if
the domain is censored
6

How do Great Firewall block sites?
1. The Great Firewall search in DNS servers if
the domain is censored
2. If IP is obtained, Great Firewall search if
this IP is saved as blocked
7

1. China establish IP targets to be attacked.
Mirror & Forbidden sites:
22

2. China ear the traffic from outside of China Network
to Baidu
23

3. China reroute a percent of this traffic and inject a
malicious JS
24

4. This malicious JS will do request constantly to target
server
25

Great Cannon discovered
Great cannon was discovered as result of DDoS on Github
repositories when a lot page was allocated as mirror of
forbidden sites.
https://www.fayerwayer.com/2015/04/asi-es-como-china-ataco-y-tumbo-github-con-su-gran-canon/ 26

Conclusion
China have a new weapon to censor by
force
China goverment don’t recognize this
attack and The Great Cannon but all
investigation point to this, so all this
is a augmented supposition
It’s effective? Now, Chinese people are
seeing the same pages attacked
27

Conclusion, bibliography and more to investigate
Citizen Lab investigation: https://citizenlab.
org/2015/04/chinas-great-cannon/
GreatFire.org: https://en.greatfire.
org/blog/2015/mar/chinese-authorities-compromise-millions-
cyberattacks
How the Grand Cannon was discovered: http://arstechnica.
com/security/2015/04/ddos-attacks-that-crippled-github-
linked-to-great-firewall-of-china/
28

Thank you!
Questions?
Ivan Ortega
@ivanortegaalba
Slides:
http://es.slideshare.net/IvanOrtega14 29

In order to detect malicious activities, we often make use of blacklists. The blacklists are useful, however malicious domain names in the blacklists can be considered static threat intelligence after we receive them. On the other hand, the behavior of the malicious domain names depends on adversaries. Advanced cyber adversaries often change their attack infrastructure in a short time in order to avoid tracking. In the extreme cases, the malicious domain names expire soon after we receive them from the blacklists. Previous studies have paid attention to the determination problem for unidentified domain names. Once some unidentified domain name prove to be malicious, operators simply register the malicious domain names with their blacklists and wait for updates. We have already presented our research regarding “Detection index learning based on cyber threat intelligence and its application” and continue to concentrate on an effective utilization of known threat intelligence. In this presentation, we will present an extended framework for examining indicators based on Domain Name System (DNS) actively and passively. In short, for malicious domain names from blacklists, while we make query regarding the domain names (Active DNS), we learn the history of the domain names from the point of view of DNS for both the survival and disposable domain names (Passive DNS). Then we make opinion, for example, we guess that some malicious domain name continue to be used, on the other hand, other one disappears soon then we recommend that you have to prepare for the next malicious activities. Based on the extended framework, we implement our indicator diagnosis system. We will show several case studies regarding the diagnosis results.

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Great Firewall & Great cannon

1. The Great Firewall & The Great Cannon 1 Ivan Ortega @ivanortegaalba Slides: http://es.slideshare.net/IvanOrtega14 1

2. The Great Firewall 2

3. China and their censure policy Until now China has been using its system: Great Firewall a part of Golden Shield Project 3

4. Great Firewall 30.000 - 50.000 police agents involved. 800.000.000 $ invested 8 years All this to censor the Internet as we know it 4

5. How do Great Firewall block sites? 5

6. How do Great Firewall block sites? 1. The Great Firewall search in DNS servers if the domain is censored 6

7. How do Great Firewall block sites? 1. The Great Firewall search in DNS servers if the domain is censored 2. If IP is obtained, Great Firewall search if this IP is saved as blocked 7

8. How do Great Firewall block sites? 1. The Great Firewall search in DNS servers if the domain is censored 2. If IP is obtained, Great Firewall search if this IP is saved as blocked 3. The Great Firewall analyse the URL to find word forbidden 8

9. How do Great Firewall block sites? 1. The Great Firewall search in DNS servers if the domain is censored 2. If IP is obtained, Great Firewall search if this IP is saved as blocked 3. The Great Firewall analyse the URL to find word forbidden 4. The Great Firewall search text forbidden that is sowed as text plain 9

10. How do Great Firewall block sites? 1. The Great Firewall search in DNS servers if the domain is censored 2. If IP is obtained, Great Firewall search if this IP is saved as blocked 3. The Great Firewall analyse the URL to find word forbidden 4. The Great Firewall search text forbidden that is sowed as text plain 10

11. How do Great Firewall block sites? 1. The Great Firewall search in DNS servers if the domain is censored 2. If IP is obtained, Great Firewall search if this IP is saved as blocked 3. The Great Firewall analyse the URL to find word forbidden 4. The Great Firewall search text forbidden that is sowed as text plain 11

12. How do Great Firewall block sites? 1. The Great Firewall search in DNS servers if the domain is censored 2. If IP is obtained, Great Firewall search if this IP is saved as blocked 3. The Great Firewall analyse the URL to find word forbidden 4. The Great Firewall search text forbidden that is sowed as text plain 12

13. Forbidden sites 13

14. Forbidden sites 14

15. Alternatives 15

16. Alternatives 16

17. What is the Great Cannon? 17

18. A Great Firewall with a Great Cannon 18

19. A Great Firewall with a Great Cannon 19

20. A Great Firewall with a Great Cannon 20

21. A Great Firewall with a Great Cannon 21

22. 1. China establish IP targets to be attacked. Mirror & Forbidden sites: 22

23. 2. China ear the traffic from outside of China Network to Baidu 23

24. 3. China reroute a percent of this traffic and inject a malicious JS 24

25. 4. This malicious JS will do request constantly to target server 25

26. Great Cannon discovered Great cannon was discovered as result of DDoS on Github repositories when a lot page was allocated as mirror of forbidden sites. https://www.fayerwayer.com/2015/04/asi-es-como-china-ataco-y-tumbo-github-con-su-gran-canon/ 26

27. Conclusion China have a new weapon to censor by force China goverment don’t recognize this attack and The Great Cannon but all investigation point to this, so all this is a augmented supposition It’s effective? Now, Chinese people are seeing the same pages attacked 27

28. Conclusion, bibliography and more to investigate Citizen Lab investigation: https://citizenlab. org/2015/04/chinas-great-cannon/ GreatFire.org: https://en.greatfire. org/blog/2015/mar/chinese-authorities-compromise-millions- cyberattacks How the Grand Cannon was discovered: http://arstechnica. com/security/2015/04/ddos-attacks-that-crippled-github- linked-to-great-firewall-of-china/ 28

29. Thank you! Questions? Ivan Ortega @ivanortegaalba Slides: http://es.slideshare.net/IvanOrtega14 29

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