Harsh

CTF-Writeups

8 posts

Blogs

2 posts

2025-09-05 1.2k words 7 mins

My LFX Mentorship Experience with CNCF Antrea

LFX MentorshipThe results for the LFX Mentorship were scheduled to be announced on June 4, 2025. I didn’t receive any email that day (timezone ;), so I waited, restless and full of anticipation. That night, my mind was filled with thoughts about the mentorship. The next morning, I woke up earlier th

2025-06-03 1.7k words 10 mins

D^3CTF 2025

D^3CTF 2025!Organized by @Vidar, @CNSS, @L-Team, the 6th D^3CTF. D^3 means “the cube of Dian”, i.e., the cube of “electronic” in Chinese. As the three teams co-hosting this CTF game come from three “University of Electronic” in China (UESTC, Xidian, HDU). I participated in D^3CTF 2025, as a member o

2025-05-28 2.2k words 14 mins

VoIP Setup for Beginners: Daily Use, CTF Challenges, and Wireshark Deep Dive

Voice over Internet ProtocolHola folks!I’m Harsh aka G4RUD4, and today I’m sharing a beginner-friendly guide to setting up a VoIP environment. Whether you’re looking to experiment with VoIP tech, dive into packet-level analysis using Wireshark, or build challenges for cybersecurity CTFs, this post h

2025-05-28 4k words 25 mins

NahamCon CTF 2025

I participated in NahamCon CTF 2025, organized by JohnHammond, as a member of my institute’s club, InfoSecIITR. This writeup details the challenge I solved during the competition. NetworkingA Special IDChallenge Description483 points - Networking - 60 Solves - hard Author: @Kkevsterrr We’ve got a br

2025-05-18 880 words 5 mins

BYUCTF 2025

BYUCTF 2025! I participated in BYUCTF 2025, organized by BYU Cyberia, as a member of my institute’s club, InfoSecIITR. This writeup details the challenge I solved during the competition. ForensicsWimdows 1Challenge DescriptionEarlier this week, an attacker managed to get into one of our Windows serv

2025-01-21 6.9k words 43 mins

Srdnlen CTF 2025

I participated in Srdnlen CTF 2025, as a member of my institute’s club, InfoSecIITR. This writeup details the challenges of the forensics category. Misc-ForensicsDFIR 1 - MalventChallenge DescriptionWe have been notified of an attack in one of our machines. This is a real forensics investigation and

2025-01-18 2.4k words 14 mins

UofTCTF 2025

UofTCTF 2025! I participated in UofTCTF 2025, organized by the University of Toronto Capture the Flag team, as a member of my institute’s club, InfoSecIITR. These writeups cover the Miscellaneous, Web and Forensics challenges that I personally solved during the competition. ForensicsPoofChallenge De

2025-01-07 8.2k words 51 mins

IrisCTF 2025

IrisCTF 2025! I participated in IrisCTF 2025, organized by IrisSec, as a member of the InfoSecIITR team. Our team secured an impressive 9th place globally. These writeups detail all the OSINT and Forensics challenges that I personally solved during the competition. I won the Writeup Prize for the Tr

2024-06-12 1.1k words 7 mins

BCACTF 5.0 2024

BCACTF 5.0! Returning for its fifth consecutive year, this high school CTF hosted by the Bergen County Academies offers challenges across various difficulty levels, catering to everyone from beginners to seasoned CTF veterans. I had the opportunity to participate in BCACTF 2024 as a member of my ins

2024-05-20 276 words 1 min

BYUCTF 2024

BYUCTF 2024! I participated in BYUCTF 2024, organized by BYU Cyberia, as a member of my institute’s club, InfoSecIITR. Our team secured 5th place globally. This writeup details the challenge I solved during the competition. ForensicsNot again! I’ve been BitLockered out of my own computer!Challenge D