alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP Win32/DownloadAssistant.A PUP CnC"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/v2/"; depth:4; fast_pattern; pcre:"/^\/v2\/(?:(?:(?:intro_impr|s)ession|l(?:aunch|og)|exit)/$|c(?:(?:dn_(?:success|check)|ancel)/$|lick/))/"; http.header_names; content:"X-Crypto-Version"; content:!"User-Agent"; reference:md5,a54f78d0fe6d1a1a09c22a71646c24b3; classtype:pup-activity; sid:2021282; rev:5; metadata:created_at 2015_06_16, signature_severity Minor, updated_at 2020_08_31;)