Unicode Obfuscation & Detecting Spam Over IRC

The Problem: A Botnet is spamming your server.  Spamfilter isn’t working.  Time to get crafty. “ΑTTⲚ: This ⅽhɑnᥒеl һɑs moᴠеd to irc.frеeᥒоdᥱ.net #⁄jоiᥒ” “AΤΤⲚ: Thⅰѕ chɑnnel haѕ moᴠed tഠ irc.frᥱeᥒoⅾе.nᥱt #/јoіn” “ATTΝ፡ Тhiѕ cһaᥒnel һas mоᴠed tഠ irc.frееnode.net ﹟∕jⲟin” “AТΤN: Thiѕ chaᥒᥒel has mоveⅾ to іrс.frеenoⅾе.ᥒᥱt #/јoⅰᥒ” “AТTN﹕ Thiѕ cһannеl һaѕ mo⋁eԁ to irc․freenoⅾᥱ․nеt #/јoіn” “ΑΤTN︓ Tһis chɑnnᥱl hаѕ moved tο irc.freenode.ᥒet #/ϳoiᥒ” “ΑTТN: Ꭲhis ϲһɑnnel һaѕ moᴠed to ⅰrc.frеeᥒoԁе.ᥒet #⧸joіn” “ATTN: This ⅽһannel һas mοvеd to irc.frᥱеnοԁе.net #/join” Notice […]