alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cloud Atlas Request to WebDAV CloudMe"; flow:established,to_server; http.uri; content:"/CloudDrive/"; nocase; pcre:"/^\/(?:b(?:i(?:llder1405|mm4276)|rowner8674935)|c(?:arter0648|h(?:ak2488|hloe7400)|orn6814)|d(?:aw0996|epp3353)|fr(?:anko7046|ogs6352)|garristone|hurris4124867|james9611|lisa\.walker|parker2339915|sa(?:mantha2064|nmorinostar)|tem5842|young0498814)\/CloudDrive\//i"; http.header; content:"webdav.cloudme.com"; fast_pattern; pcre:"/^Host\x3a[^\r\n]+?webdav\.cloudme\.com[^\r\n]*?\r?$/mi"; reference:url,securelist.com/blog/research/68083/cloud-atlas-redoctober-apt-is-back-in-style/; classtype:trojan-activity; sid:2019915; rev:4; metadata:created_at 2014_12_11, signature_severity Major, updated_at 2020_09_28;)