0x00 Introduction

CrossCTF is a cyber security competition organized by NTU with collaboration with NUS Greyhats and SMU Whitehats. This also provides a platform for participants to hack safely in Singapore. The other reason is to promote Cyber Security Capture-The-Flag Competitions in Singapore.

Here is a short video which covers on what CTF is:

Are you ready to H4cK?

If your answer is yes, then continue down to view the details!

0x07 Rules


  • Do not attack other competitors, or their devices.

  • Do not attack the scoring server or the network infrastructure

  • Do not attack anything outside of the CTF environment.

  • Unless explicitly stated, attacking or probing (e.g. port scanning) any other targets is strictly prohibited.

  • Do not delete or modify flags.

  • You are allowed to use the internet.

  • ARP poisoning or any form of man-in-the-middle attack is prohibited (this includes sniffing traffic on wireless network).

  • Sharing of flags or discussing solutions is prohibited.

  • Brute-forcing flags will not be tolerated.

  • Denial of service attacks on any challenge will not be tolerated, unless the challenge calls for such an attack.

  • If you find any bug in the system, let us know. We might give you some bonus points.

Any violation of the rules above will result in disqualification. Organizers’ decision is final.


Minor Cases:

Deduction of 1000 points from final team score

Severe Cases:

Disqualification If actions are deemed severe (including but not limited to: damage of property, attacking of sensitive systems), a police report will be made and participants will be prosecuted to the fullest extent of the law.


legal consequence

0x01 Annoucements

21 May 2018

CrossCTF Quals has ended.

18 May 2018

Qualifier will start at 1pm (UTC+08:00) on 19 May 2018 (Saturday). It will end at 1pm on 21 May (Monday) for a total of 48 hours.

17 May 2018

CrossCTF is a competition between schools. It is designed to foster healthy competition between the various educational instutions in Singapore. Traditionally, a Champion’s Trophy has and will continue to be passed to the winning schools of the year.

In the light of the above, we have to make clear the constraint that the members in a team have to be currently in the same school to adequately represent their institution.

This clarification of the rule will affect teams who are recent graduates of their schools and are no longer holding valid matriculation cards. Letters of acceptance/placing for future admittance will no longer be accepted.

15 May 2018

  1. we would like to clarify that there will be a minimum number of team members of 1 and maximum number of team members of 3. So anybody who can’t form a team of 3 can still play in the qualifiers and finals.

  2. since this is a inter-varsity competition where teams will be representing their schools, we decided to ensure that all teams are only from ONE school. All teams with more than 1 school will contacted individually.

  3. after the qualifiers, teams who will be moving on to the final round will have to provide proof of admittance of their respective school. Failure to do so will result in disqualification and the right to move on to the final round will be passed to the next eligible team.


0x02 CTF Schedule

DAY 1  
1:00pm Registration opens
2:00pm Briefing/Opening keynote speech
2:30pm Competition Starts
6:30pm Dinner
11:59pm Supper

DAY 2  
7:30am Breakfast
12:00pm Lunch
1:30pm Scoreboard blackout
2:30pm Competition Ends
3:00pm Closing keynote speech
3:30pm Award Ceremony
4:30pm End of event / Tea break / Networking

0x03 Qualifying Team

The following are the qualifying criteria:

  1. Passing the threshold. The threshold is is the median score (1928) out of all the teams
  2. Top 2 teams from their respective schools

If the capacity of 20 teams are still not filled, we will include the highest scoring teams out of those eliminated teams until there are 20 teams.

1 additional slot has opened up hence the next highest scoring team was added.

Here are the teams that have qualified for the competition:

No. Team Name Affiliation Score
1 TinyBoxer NTU 9906
2 Dorayaki Singapore Polytechnic 9886
3 OSI Layer 8 NUS High School 7349
4 Segfaulters NUS High School 6000
5 SnM Nanyang Polytechnic 5968
6 N0X10U5 G4S3S Hwa Chong Institution 5394
7 AJ Whitehats Anderson Junior College 5137
8 ret_to_ac Anglo-Chinese School (Independent) 5060
9 CrossCTF{Gh057_in_t3h_5he11} NUS 5004
10 balonglong NUS 5004
11 M3mes for Dr3ams SUTD 4988
12 Swamp Magicians Ngee Ann Polytechnic 4218
13 BoT NUS 4173
14 A Bunch Of Losers SMU 4085
15 ACL Nanyang Polytechnic 3569
16 nu11ptr NUS High School 3563
17 ScriptBaby Ngee Ann Polytechnic 3551
18 SAS Hackers Singapore American School 3429
19 SC4TT3R3D Singapore Polytechnic 3387
20 \x52\x45\x50 NTU 2677
21 Pylon Eunoia Junior College 1928

0x05 Registration And Details

To Join Cr055CTF2018


You and/or your team will have to :

-	Form a team of 3 particiapnts

	-	Each team can only have 3 participants
	- 	All participants in the team are to be from a institute 
		of higher learning in Singapore

-	Sign up by **10 May 2018**

-	Go through a compulsory online qualifier.


We will be giving your contacts to the event sponsors if you choose to do so. 
HOWEVER, If you and your team are not comfortable with photography during the finals, 
do drop us a message or indicate during the registration!

The winners will receive cash prizes. Winners will be decided based on final score earned by the end of the competition.

Position Cash Prizes
1st $5,000 + Gold Medals
2nd $4,000 + Silver Medals
3rd $2,000 + Bronze Medals

Dates of Competition:

Qualifier Round 19-20 May 2018 (Sat-Sun)
Final Round 16-17 June 2018 (Sat-Sun)
More Details:
CTF Duration : 24 Hrs (2.30pm to 2.30pm)
CrossVillage Track : 5.5 Hrs (9 am to 3.00 pm)
LOCATION : SgInnovate’s BASH @ One-north

Finalists will receive a Goodie Bag, Event T-shirt, Event Lanyards and some additional free stuff!!

0x04 Challenges

Potential Categories with some resources

  1. Reverse Engineering
  2. Cryptography
  3. Miscellaneous
  4. Pwnables
  5. Web
  6. Forensics
  7. Mobile

0x06 Cr055CTF2018 Sponsors

We would like to thank the sponsors for their contribution in making this CROSSCTF 2018 possible!

Vintage Logo
Vantage Point
Cyber Test Systems
Ministry Of Home Affairs
Centre for Cyber Security Studies
GovTech Singapore

DSO LOGO SGinnovate Logo
DSO National Laboratory
ICE71 Logo IIC Logo
Infosec In The City