Also known as
  • NUS GreyHats
  • NUS_Greyhats
  • NUS Grayhats
  • NUS_Grayhats
  • NUSGrayhats

Academic team National University of Singapore



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Singapore based CTF Team. We are based in School of Computing, National University of Singapore.

Participated in CTF events

Overall rating place: 291 with 71.830 pts in 2023

Country place: 7

PlaceEventCTF pointsRating points
15HackTM CTF Quals 20232863.000015.019
12Insomni'hack teaser 20231503.00009.512

Overall rating place: 141 with 183.964 pts in 2022

Country place: 3

PlaceEventCTF pointsRating points
7ISITDTU CTF 2022 Finals738.00009.973
11ISITDTU CTF 2022 Quals3989.000023.273
80SECCON CTF 2022 Quals504.000012.440
4LakeCTF Finals1413.000018.417
5LakeCTF Qualifications4457.000023.537
31Balsn CTF 2022969.000012.412
14nullcon Goa HackIM CTF 20222086.00009.257
154SHELLCTF 20222380.00009.655
143Crypto CTF 202281.00001.223
12TAMUctf 20224159.000013.849
13DiceCTF 20222440.000011.407
25Real World CTF 4th548.00009.090

Overall rating place: 425 with 78.332 pts in 2021

Country place: 8

PlaceEventCTF pointsRating points
18X-MAS CTF 2021 Second Weekend4948.00006.180
31TSG CTF 2021956.00008.856
42CSAW CTF Qualification Round 20215167.000010.456
5BSides Noida CTF8493.000019.784
44Crypto CTF 2021748.00006.966
44DiceCTF 2021961.00005.580
7BambooFox CTF 20213657.000020.509
PlaceEventCTF pointsRating points
70picoCTF 201929851.00000.000

Overall rating place: 530 with 38.167 pts in 2018

Country place: 3

PlaceEventCTF pointsRating points
2814picoCTF 20183110.00000.000
811IceCTF 2018360.00001.634
127*CTF 2018132.00000.481
120Blaze CTF 2018420.00001.538
3BSidesSF CTF 20184895.00000.000
19Midnight Sun CTF 2018 Quals965.00009.749
149Timisoara CTF 2018 Quals386.00002.346
15HITB-XCTF GSEC CTF 2018 Quals5348.000010.415
16UIUCTF 2018752.00005.709
1830CTF/TCTF 2018 Quals93.00000.901
426NeverLAN CTF 2018410.00000.857
197Harekaze CTF 201890.00000.836
10EasyCTF IV5331.00000.000
62Insomni'hack teaser 2018257.00004.182

Overall rating place: 195 with 75.794 pts in 2017

Country place: 1

PlaceEventCTF pointsRating points
33TUCTF 20172526.000011.695
109HITCON CTF 2017 Quals506.00006.901 CTF 20171029.000011.511
64DefCamp CTF Qualification 2017355.00001.809
200CSAW CTF Qualification Round 20171026.00004.052
502ASIS CTF Finals 201718.00000.244
182Tokyo Westerns CTF 3rd 2017146.00002.004
5HITB CTF Singapore 20175417.000014.762
516Google Capture The Flag 2017 (Quals)50.00000.240
94DEF CON CTF Qualifier 2017196.00005.512
86PlaidCTF 2017587.000010.001
141nullcon HackIM 750.00000.705

Overall rating place: 156 with 82.540 pts in 2016

Country place: 2

PlaceEventCTF pointsRating points
146SECCON 2016 Online CTF500.00002.513
95Qiwi-Infosec CTF-20161000.00002.134
14DefCamp CTF Finals 20162555.000013.733
24HITCON CTF 2016 Quals2250.000029.349
7DefCamp CTF Qualification 20161652.00009.481
50CSAW CTF Qualification Round 20162726.000013.280
69ASIS CTF Finals 2016281.00004.405
101Pwn2Win CTF 2016130.00001.392
434BCTF 201610.00000.140
245SunshineCTF 201650.00000.152
3640CTF 2016 Quals1.00000.621
557Boston Key Party CTF 20161.00000.733
474SSCTF 2016 Quals10.00000.039
516Internetwache CTF 2016120.00000.295
274HackIM 20161500.00000.890
128Insomni'hack teaser 2016250.00003.382

Overall rating place: 251 with 40.669 pts in 2015

Country place: 2

PlaceEventCTF pointsRating points
27132C3 CTF150.00001.687
173SECCON 2015 Online CTF1100.00005.392
138HITCON CTF 2015 Quals101.00001.364
62ASIS CTF Finals 2015476.00004.452
31Trend Micro CTF Asia Pacific & Japan 2015 Online Qualifier2406.00008.935
209CSAW CTF Qualification Round 20151460.00008.705
52PoliCTF 20151250.00008.160
228DEF CON CTF Qualifier 20151.00001.974

Organized CTF events

Grey Cat The Flag 2023 Qualifiers23.65
Grey Cat The Flag 202224.50

Team members

Team writeups

LakeCTF Finalspaccheri [493]read writeup
LakeCTF FinalsCalc-You-Later [247]read writeup
LakeCTF FinalsCalc-You-Later [247]read writeup
LakeCTF QualificationsPeople [50]read writeup
LakeCTF Qualificationscurl | zsh [50]read writeup
LakeCTF QualificationsPeople [50]read writeup
BSidesSF CTF 2018Goribbler [666]read writeup
Midnight Sun CTF 2018 QualsBabyshells [50]read writeup
Midnight Sun CTF 2018 QualsJeil [200]read writeup
Midnight Sun CTF 2018 QualsBotpanel [300]read writeup
HITB-XCTF GSEC CTF 2018 QualsUpload [253]read writeup
HITB-XCTF GSEC CTF 2018 QualsRead File [266]read writeup
HITB-XCTF GSEC CTF 2018 QualsBaby Nya [588]read writeup
HITB-XCTF GSEC CTF 2018 QualsBaby Baby [488]read writeup
HITB-XCTF GSEC CTF 2018 Qualsbabypwn [253]read writeup
HITB CTF Singapore 20171000levels [606]read writeup
HITB CTF Singapore 20172017, Dating in Singapore [219]read writeup
HITB CTF Singapore 2017simple_transfer [259]read writeup
HITB CTF Singapore 2017Pasty [425]read writeup
HITB CTF Singapore 2017flying_high [281]read writeup
HITB CTF Singapore 2017arrdeepee [666]read writeup
CSAW CTF Qualification Round 2016Warmup [50]read writeup
HITCON CTF 2016 QualsBeelzemon [150]read writeup
Insomni'hack teaser 2016smartcat1 [50]read writeup
32C3 CTFFlash [300]read writeup
HITCON CTF 2015 Qualssimple [100]read writeup
ASIS CTF Finals 2015ultra compression [125]read writeup
ASIS CTF Finals 2015Big Lie [100]read writeup
CSAW CTF Qualification Round 2015pcapin [150]read writeup
Trend Micro CTF Asia Pacific & Japan 2015 Online QualifierAnalysis - Offensive 200 [200]read writeup
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