CTFtime.org

PT xSTF

Also known as
  • Extreme Security Task Force

Academic team University of Porto

Website: https://xstf.pt

Twitter: https://x.com/xstf_team

Sign in to join the team.



Participated in CTF events

Overall rating place: 121 with 296.126 pts in 2025

Country place: 2

PlaceEventCTF pointsRating points
104m0leCon CTF 2026 Teaser100.00004.317
37Hack.lu CTF 20251345.000026.871
74Securinets CTF Quals 20252337.000019.561
52SunshineCTF 20253273.000022.583
149CrewCTF 2025150.00001.008
51[DELAYED] CSAW CTF Qualification Round 20255060.000010.331
32FortID CTF 20252550.00009.889
84ImaginaryCTF 20252613.000017.832
114snakeCTF 2025 Quals150.00001.868
134Lexington Informatics Tournament CTF 20252571.000025.758
245BrunnerCTF 20251575.00001.762
135SekaiCTF 2025578.00005.854
17Startpwn CTF 20251435.000013.577
319idekCTF 2025200.00001.318
32World Wide CTF 20256114.000011.178
71UIUCTF 2025791.000016.620
25BDSec CTF 20252770.00007.700
91DownUnderCTF 20253214.000025.984
98L3akCTF 20251835.00003.347
12BlitzCTF8145.000012.252
11GPN CTF 20252144.000026.315
196Midnight Sun CTF 2025 Quals61.00001.731
202DamCTF 2025504.00004.167
47UniVsThreats 25 CTF904.00003.634
56UMDCTF 20256307.000028.081
8UMassCTF 20256972.000033.173
75DEF CON CTF Qualifier 2025143.00003.173
182PlaidCTF 2025101.00002.880
138DiceCTF 2025 Quals325.00005.723
9pingCTF 20253852.000022.824
36UTCTF 202512856.000060.119
9Pearl CTF5500.000024.418
45BroncoCTF 20255556.000011.476
21LA CTF 20258355.000019.487
134Srdnlen CTF 2025 Quals210.00001.653

Overall rating place: 274 with 156.954 pts in 2024

Country place: 2

PlaceEventCTF pointsRating points
140xL4ugh CTF1670.00007.294
8BackdoorCTF 20243300.000022.826
550CTF 2024270.00004.460
58HTB University CTF 2024: Binary Badlands18625.00000.000
19 GlacierCTF 20242031.000011.200
451337UP LIVE CTF2700.00008.128
47ISITDTU CTF 2024 Quals750.00007.813
29Hack.lu CTF 2024828.000022.005
18BuckeyeCTF 20244097.000029.104
61PatriotCTF 20245386.00009.887
164CSAW CTF Qualification Round 20241999.00006.937
160Lexington Informatics Tournament CTF 20241709.000015.622
137corCTF 2024344.00003.760
85CatTheQuest60.00000.000
12vsCTF 20246325.000021.912
30Akasec CTF 20242709.00004.914
174DEF CON CTF Qualifier 202423.00000.900
74Midnight Sun CTF 2024 Quals287.00002.497
140PlaidCTF 202451.00001.979
21Pearl CTF3919.00008.456
112VishwaCTF 20243061.00007.316
222bi0sCTF 2024100.00000.907
490BraekerCTF60.00000.432
167LA CTF 20244000.00005.378
290DiceCTF 2024 Quals215.00002.208
87Real World CTF 6th116.00006.025
173Insomni'hack teaser 202459.00000.987

Overall rating place: 399 with 103.957 pts in 2023

Country place: 3

PlaceEventCTF pointsRating points
490CTF/TCTF 2023270.00004.228
32 GlacierCTF 20231410.00006.059
151337UP LIVE CTF6140.000011.621
63CakeCTF 2023715.00000.000
6SpookyCTF 202310049.000020.061
73N1CTF 2023130.00003.604
53Hack.lu CTF 2023531.000011.444
170CSAW CTF Qualification Round 20231505.00003.295
146Google Capture The Flag 2023355.00005.195
52DEF CON CTF Qualifier 2023236.00006.272
48TAMUctf 20236330.000015.815
70PlaidCTF 2023451.000014.899
70Midnight Sun CTF 2023 Quals494.00004.115
83UTCTF 2025 20232647.00006.852
122hxp CTF 202280.00002.413
82Nullcon Berlin HackIM 2023 CTF396.00001.843
264KalmarCTF 2023300.00000.538
101pbctf 2023132.00001.590
76DiceCTF 2023807.00005.738
30Insomni'hack teaser 2023607.00003.835
350Real World CTF 5th34.00000.762
204TetCTF 2023100.00000.685

Overall rating place: 430 with 77.879 pts in 2022

Country place: 4

PlaceEventCTF pointsRating points
91ASIS CTF Finals 202299.00003.915
178NahamCon EU 2022 CTF 524.00001.102
264TUCTF 2022197.00000.452
406HITCON CTF 202279.00001.338
49Digital Overdose 2022 Autumn CTF1450.00009.707
66BuckeyeCTF 20222024.00005.871
61N1CTF 2022108.00001.822
542DEADFACE CTF200.00000.629
87ASIS CTF Quals 2022268.00007.288
707DownUnderCTF 2022 (Online) 350.00000.723
663CSAW CTF Qualification Round 202253.00000.175
327corCTF 2022214.00000.691
349ImaginaryCTF 2022800.00001.831
333Google Capture The Flag 202250.00000.939
82DEF CON CTF Qualifier 2022132.00004.827
178Cyber Apocalypse CTF 2022: Intergalactic Chase 6075.00007.809
63m0leCon CTF 2022 Teaser197.00003.342
115ångstromCTF 20221670.000020.148
42NahamCon CTF 20228490.00008.781
272PlaidCTF 20221.00000.376
122zer0pts CTF 2022289.00002.105
671337UP LIVE CTF2623.00005.708
101UMDCTF 20222958.00003.824
263DefCamp CTF 21-22 Online50.00000.583
278DiceCTF 2022216.00000.930
142Insomni'hack teaser 202276.00000.647
77Real World CTF 4th105.00002.034
90TetCTF 2022200.00001.012

Overall rating place: 224 with 112.420 pts in 2021

Country place: 2

PlaceEventCTF pointsRating points
362X-MAS CTF 2021 Second Weekend78.00000.142
452SECCON CTF 202153.00000.989
42N1CTF 2021284.00002.816
58DamCTF 20213272.000010.239
56Hack.lu CTF 2021791.000015.131
93ASIS CTF Quals 2021215.00007.076
29Jornadas 20214629.00007.812
25DEADFACE CTF6022.000014.454
71Digital Overdose 2021 Autumn CTF2836.00008.815
327TSG CTF 2021200.00001.724
73DownUnderCTF 2021 (Online)3738.00005.899
11H@cktivityCon 2021 CTF9159.000017.026
41RCTF 20211472.00007.107
158ALLES! CTF 2021237.00002.246
13HITB SECCONF EDU CTF 2021315478.39003.967
26corCTF 20216350.000012.499
33InCTF 20213298.000012.061
3RCTS CERT 2021 Defending the SOC6229.00000.000
346Crypto CTF 202119.00000.260
60CyBRICS CTF 2021733.00005.924
259Google Capture The Flag 202150.00001.145
2040CTF/TCTF 2021 Quals 24.00000.651
279WeCTF 2021324.00000.000
416HSCTF 81897.00002.644
359BCACTF 2.01050.00000.000
227m0leCon CTF 2021 Teaser57.00000.477
160DEF CON CTF Qualifier 2021101.00002.852
52WPICTF 20211251.00000.000
38UMDCTF 20217326.00000.000
500PlaidCTF 20211.00000.216
162Midnight Sun CTF 2021 Quals129.00001.565
92RITSEC CTF 20212916.00000.000
238ångstromCTF 2021975.00007.276
162VolgaCTF 2021 Qualifier132.00001.338
121BlueHens CTF 2021200.00000.642
195Codefest CTF 2020356.00001.877
520UTCTF 2021605.00000.651
135NahamCon CTF 20215775.00005.062
31Winja CTF770.00005.743
216zer0pts CTF 2021131.00000.731
340Tenable CTF 20211375.00004.589
73justCTF [*] 2020549.00003.686

Overall rating place: 187 with 140.643 pts in 2020

Country place: 2

PlaceEventCTF pointsRating points
384hxp CTF 202019.00000.466
92pbctf 2020183.00001.083
68HITCON CTF 2020419.00009.586
89Dragon CTF 2020239.00005.868
98Block CTF 2020201.00003.428
191CyberSecurityRumble CTF1374.00003.610
76RaziCTF 20204253.00002.507
47Hack.lu CTF 20201393.000025.227
19e-Jornadas 20202300.000010.155
94TastelessCTF 2020201.00001.182
96Evlz CTF 3.01.00000.257
102EKOPARTY CTF 20203006.00005.159
638TokyoWesterns CTF 6th 202033.00000.805
575DownUnderCTF 2020470.00000.866
98CSAW CTF Qualification Round 20201505.000020.760
401Google Capture The Flag 202050.00000.883
776csictf 2020300.00000.343
219Pwn2Win CTF 202050.00000.944
87DEF CON CTF Qualifier 2020377.00005.864
124PlaidCTF 2020501.00008.217
574TG:HACK 2020413.00000.940
7VirSecCon CTF5395.000025.530
171FireShell CTF 2020200.00000.652
85Securinets CTF Quals 20201119.00002.124
148TAMUctf 20201856.00000.000
42ångstromCTF 20203655.000022.385
530UTCTF 2020202.00000.210
180Aero CTF 2020200.00000.791
213NeverLAN CTF 20202340.00002.356
50nullcon HackIM 20201256.00007.051
50HackTM CTF Quals 20201805.00004.733
221Insomni'hack teaser 202072.00001.962

Overall rating place: 191 with 114.888 pts in 2019

Country place: 3

PlaceEventCTF pointsRating points
224hxp 36C3 CTF35.00000.461
55Inferno CTF 20191213.00006.888
47justCTF 2019639.00003.071
65X-MAS CTF 20192686.00003.548
140OverTheWire Advent Bonanza 2019416.00001.107
41Hack.lu CTF 20191243.000011.610
173HITCON CTF 2019 Quals155.00003.011
36Rooters CTF2666.00007.406
208Teaser Dragon CTF 201968.00000.832
76InCTF 2019421.00002.390
20Newark Academy CTF 20197260.000021.040
177CSAW CTF Qualification Round 2019601.00004.941
44DefCamp CTF Qualification 2019762.00004.512
643N1CTF 201912.00000.080
194TokyoWesterns CTF 5th 2019200.00005.762
168redpwnCTF 2019852.00001.630
208ISITDTU CTF 2019 Quals110.00000.282
244Google Capture The Flag 2019 (Quals)92.00002.298
113Facebook CTF 20191350.00001.671
54RCTF 2019907.00003.504
16INS'hAck 20191831.000012.328
122ångstromCTF 20191010.00004.460
67PlaidCTF 20191061.000018.819
103Midnight Sun CTF 2019 Quals307.00001.241
277VolgaCTF 2019 Qualifier150.00001.347
51Securinets CTF Quals 20194747.00004.867
9020CTF/TCTF 2019 Quals1.00000.103
144CONFidence CTF 2019 Teaser60.00000.724
76BSidesSF 2019 CTF315.00001.575
235TAMUctf 197354.000012.280
108NeverLAN CTF 20195035.000012.261
46Insomni'hack teaser 2019335.00006.494

Overall rating place: 90 with 168.543 pts in 2018

Country place: 2

PlaceEventCTF pointsRating points
13835C3 CTF94.00002.912
118X-MAS CTF 20181302.00002.582
146hxp CTF 2018103.00001.559
78BCTF 2018231.00000.757
14TUCTF 20189655.000025.800
61Kaspersky Industrial CTF 201850.00000.499
119SECCON 2018 Online CTF631.00004.103
633HITCON CTF 201850.00000.746
43Hack.lu CTF 20181170.000017.608
22Hackover CTF 20181501.00007.396
394DefCamp CTF Qualification 20181.00000.054
432CSAW CTF Qualification Round 2018276.00001.573
715TokyoWesterns CTF 4th 201828.00000.509
240TJCTF 2018270.00002.952
58Real World CTF 2018 Quals66.00001.085
111CTFZone 2018 Quals106.00000.702
717Meepwn CTF Quals 2018100.00000.276
125Google Capture The Flag 2018 (Quals)234.00003.254
209RCTF 2018125.00000.382
50PlaidCTF 2018651.000013.077
24ASIS CTF Quals 20181470.000016.086
132Blaze CTF 2018420.00001.520
37BSidesSF CTF 2018205.00000.000
40Midnight Sun CTF 2018 Quals310.00003.333
13HITB CTF Amstedam 20183914.00000.000
46INS'hAck 2018647.00003.037
6530CTF/TCTF 2018 Quals16.00000.188
52Nuit du Hack CTF Quals 20181301.000015.314
255SwampCTF 2018734.00001.711
316VolgaCTF 2018 Quals10.00000.155
11BackdoorCTF 20181425.000017.605
111b00t2root '1825.00000.332
275ångstromCTF 20181070.00006.488
231UCSB iCTF 201840561.000022.261
237N1CTF 2018127.00000.395
71Pragyan CTF 20181350.00003.245
151NeverLAN CTF 20181860.00003.810
123Xiomara CTF 2018201.00001.734
453TAMUctf 18626.00002.415
150Harekaze CTF 2018180.00001.588
303EasyCTF IV991.00000.000
18EvlzCTF925.00007.003
13SharifCTF 82025.000024.383
87AceBear Security Contest 2018200.00000.714
44Break In CTF 2018500.00003.365
20Insomni'hack teaser 2018523.00009.012
384RHme31.00000.000

Overall rating place: 82 with 146.526 pts in 2017

Country place: 2

PlaceEventCTF pointsRating points
3934C3 CTF475.00008.500
68InCTF 2017100.00000.914
75 The 318br, DESEC and SucuriHC Capture The Flag (3DSCTF)1442.00002.516
315SECCON 2017 Online CTF700.00003.376
73Takoma Park CTF260.00003.891
135Juniors CTF 2017600.00002.340
22TUCTF 20172826.000013.307
135RC3 CTF 2017300.00001.263
57hxp CTF 2017473.00003.485
364HCTF 201710.00000.090
95CODE BLUE CTF 2017269.00001.341
72HITCON CTF 2017 Quals830.000011.239
140Pwn2Win CTF 2017198.00000.981
26Hack.lu CTF 20171876.000021.710
127Hack Dat Kiwi 2017230.00001.757
99Block CTF 20171260.00005.740
235DefCamp CTF Qualification 201710.00000.105
22BackdoorCTF 20172000.000022.352
6Codefest CTF 20171580.00005.954
95EKOPARTY CTF 2017975.00004.553
131CSAW CTF Qualification Round 20171726.00006.798
41SEC-T CTF975.00007.405
51ASIS CTF Finals 2017589.00005.369
81Tokyo Westerns CTF 3rd 2017380.00005.107
159WhiteHat Challenge 040.00000.000
28h4ckc0n 2017436.00007.029
79HackIT CTF 2017370.00001.870
15HITB CTF Singapore 20173680.00008.644
360RHme3 - Qualifiers1.00007.250
79SHA2017 CTF1100.00005.831
98bugs_bunny ctf 2k17745.00003.221
197MeePwn CTF 1st 2017101.00000.415
32PoliCTF 20171292.00006.459
113SECUINSIDE CTF Quals 201760.00000.374
67Trend Micro CTF 2017 - Raimund Genes Cup - Online Qualifier700.00003.432
35Google Capture The Flag 2017 (Quals)1356.00005.975
37SHA2017 CTF Teaser round250.00000.000
21Security Fest 20171170.00009.671
33WhiteHat Contest 13600.00003.606
99RCTF 2017637.00001.280
18UIUCTF 20171600.00009.973
75DEF CON CTF Qualifier 2017314.00008.584
48PlaidCTF 2017962.000016.544
8Insigne CTF265.00000.000
274BCTF 201764.00000.185
8HITB CTF Amsterdam 20171700.000011.218
179TAMUctf 2017830.00004.066
126FIT-HACK CTF 20171250.00005.905
15SunshineCTF 2017826.00002.036
331ASIS CTF Quals 20171.00000.121
16INS'hAck 20171748.00008.504
66Teaser CONFidence CTF 2017201.00000.955
31Nuit du Hack CTF Quals 20171100.000011.495
139April Fools' GTF 2017605.00000.000
16Securinets CTF Quals 2017700.00004.418
119VolgaCTF 2017 Quals700.00003.911
3870CTF 2017 Quals12.00000.191
160EasyCTF 20171910.00000.000
150UCSB iCTF 201710270.63830.360
37Pragyan CTF 20171185.00003.724
62Xiomara CTF 2017451.00002.209
35VolgaCTF 2017 Teaser100.00000.000
76Boston Key Party CTF 2017751.000010.377
63BSides San Francisco CTF1661.00006.183
64h4ckc0n mini5.00000.342
43nullcon HackIM 2050.00001.947
104Codegate 2017 prequals150.00001.673
21BITSCTF 2017505.000010.253
28AlexCTF2540.000018.032
262Insomni'hack teaser 201750.00000.421

Overall rating place: 96 with 149.941 pts in 2016

Country place: 2

PlaceEventCTF pointsRating points
8033C3 CTF600.00008.914
18The 318br, DESEC, and SucuriHC Capture The Flag (3DSCTF)5701.000015.678
67SharifCTF 71151.00007.415
265SECCON 2016 Online CTF400.00001.959
82Juniors CTF 20162200.00000.000
16RC3 CTF 20164665.000013.153
22Qiwi-Infosec CTF-20163700.00008.001
29Hack The Vote 20161901.00008.571
43EKOPARTY CTF 20161700.000015.268
85Hack.lu CTF 2016423.000010.854
233HITCON CTF 2016 Quals100.00001.474
23Hackover CTF 201691.00003.620
160TUM CTF 2016145.00000.824
57DefCamp CTF Qualification 2016302.00001.611
648CSAW CTF Qualification Round 201676.00000.395
338ASIS CTF Finals 20163.00000.208
285Tokyo Westerns/MMA CTF 2nd 2016160.00001.496
145CTF(x) 2016151.00000.000
120h4ckc0n 2016651.00003.283
280SECUINSIDE CTF Quals 20161.00000.048
154BackdoorCTF 201610.00000.358
284ALICTF 20165.00000.064
139DEF CON CTF Qualifier 201681.00002.027
97TU CTF 2016885.00003.835
372ASIS CTF Quals 20161.00000.113
137Google Capture The Flag 2016755.00003.682
155Blaze CTF 2016420.00002.944
109PlaidCTF 2016502.000010.752
156Nuit du Hack CTF Quals 2016450.00005.453
72Pwn2Win CTF 2016180.00001.931
102VolgaCTF 2016 Quals650.00003.316
131BCTF 2016160.00001.265
254SunshineCTF 201650.00000.151
1990CTF 2016 Quals1.00000.714
108Boston Key Party CTF 201615.00009.931
258SSCTF 2016 Quals110.00000.250
438Sharif University CTF 201650.00000.384

Overall rating place: 213 with 49.844 pts in 2015

Country place: 2

PlaceEventCTF pointsRating points
23632C3 CTF150.00001.725
137SECCON 2015 Online CTF1300.00006.387
429447 Security Society CTF 20151237.00008.615
84RuCTFE 2015404075.89003.557
121TUM CTF Teaser21.00000.471
96WhiteHat Grand Prix – Qualification Round 2015100.00000.533
87EKOPARTY CTF 2015690.00006.710
122Hack.lu CTF 2015580.00005.924
361HITCON CTF 2015 Quals1.00000.148
104Hackover CTF 2015271.00000.359
93ASIS CTF Finals 2015251.00002.438
193Defcamp CTF Qualification 2015401.00000.913
209Trend Micro CTF Asia Pacific & Japan 2015 Online Qualifier400.00001.474
433MMA CTF 1st 201550.00000.437
134PoliCTF 2015500.00003.257
146DEF CON CTF Qualifier 20153.00005.353
55UCSB iCTF 20141.71881.542

Organized CTF events

NameWeight
eCrimeCTF20170.00

Team members

Team writeups

EventTaskAction
INS'hAck 2019Drone motion [50]read writeup
BackdoorCTF 2018shelter [200]read writeup
hxp CTF 2017hardened_flag_store [300 + 20]read writeup
Google Capture The Flag 2017 (Quals)Food [191]read writeup
Security Fest 2017Braindump [200]read writeup
HITB CTF Amsterdam 2017Transcoder [100]read writeup
Boston Key Party CTF 2017hiddensc [200]read writeup
Insomni'hack teaser 2017baby [50]read writeup
Qiwi-Infosec CTF-2016PWN 200_3 [200]read writeup
Hackover CTF 2016are_you_serialz [22]read writeup
SSCTF 2016 QualsHeHeDa [100]read writeup
ASIS CTF Finals 2015Calm Down [75]read writeup
Trend Micro CTF Asia Pacific & Japan 2015 Online QualifierProgramming 100 [100]read writeup
Trend Micro CTF Asia Pacific & Japan 2015 Online QualifierProgramming 200 [200]read writeup