alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE OSX/Flashback.K/I User-Agent"; flow:established,to_server; http.header; content:"|20|WOW64|3b 20|rv|3a|9.0.1|3b 20|sv|3a|"; content:"|20|id|3a|"; within:6; reference:url,f-secure.com/v-descs/trojan-downloader_osx_flashback_k.shtml; reference:url,vms.drweb.com/virus/?i=1816029; reference:url,f-secure.com/v-descs/trojan-downloader_osx_flashback_i.shtml; classtype:trojan-activity; sid:2014534; rev:5; metadata:created_at 2012_04_05, malware_family OSX_Flashback_K_I, confidence High, signature_severity Major, updated_at 2020_04_21;)