Yara

Platform BYUCTF 2026 Difficulty Mixed (Easy → Hard) OS Jeopardy (Crypto, Forensics, Reverse, Web) Tags Coppersmith small-roots, multi-prime RSA, Euler totient tower reduction, YARA constraint solving, NTP/ICMP/HTTP pcap forensics, Go reverse engineering, Python prototype pollution, CSP bypass BYUCTF 2026 is Brigham Young University’s annual capture-the-flag, hosted on the Cyber Jousting infrastructure (chals.cyberjousting.com). The 2026 edition runs fifteen challenges across four classic jeopardy categories — Crypto, Forensics, Reverse, and Web — with a heavy Portal-flavoured forensics arc starring GLaDOS, Wheatley, and the cake-is-a-lie ICMP/NTP/HTTP capture. ...

YARA is the pattern-matching language of malware analysis. Writing rules is easy; writing rules that survive the next sample variant is hard. This guide focuses on the second. The Rule Structure rule Example_Detection { meta: description = "Detects Example loader v3" author = "CyberSecurity Elite" date = "2026-04-14" hash = "f3b1...c7e9" reference = "https://example.com/report" tlp = "white" strings: $s1 = "C2_BEACON_HEADER" ascii wide $s2 = { 48 8b ?? ?? 48 89 ?? E8 [4] 85 C0 } $s3 = /api\/v[0-9]\/(checkin|exec)/ ascii nocase condition: uint16(0) == 0x5A4D and 2 of them } Three string types — text, hex with wildcards/jumps, and regex. The condition is what makes the rule precise. ...