alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Cohhoc RAT CnC Response"; flow:established,from_server; http.header; content:"Content-Length|3a 20|64|0d 0a|"; file.data; content:"gAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"; offset:1; depth:63; fast_pattern; reference:url,public.gdatasoftware.com/Presse/Publikationen/Whitepaper/EN/GDATA_TooHash_CaseStudy_102014_EN_v1.pdf; classtype:command-and-control; sid:2019626; rev:7; metadata:created_at 2014_11_03, signature_severity Major, updated_at 2020_11_05;)