alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Nymaim.BA CnC M1"; flow:established,to_server; http.method; content:"POST"; http.uri; content:!"/"; offset:1; content:!"|2e|"; pcre:"/^\/[a-z0-9]+\?[a-z0-9]+(?:=[a-z0-9&=]+)?$/i"; http.request_body; pcre:"/^[\x20-\x7e\r\n]{0,20}[^\x20-\x7e\r\n]/"; http.header; header_lowercase; content:"|2e|in|0d 0a|user-agent|3a 20|"; fast_pattern; content:"cache-control|3a 20|no-cache"; content:"pragma|3a 20|no-cache"; http.header_names; to_lowercase; content:!"|0d 0a|accept"; content:!"|0d 0a|referer|0d 0a|"; content:!"|0d 0a|content-type|0d 0a|"; reference:md5,3831e58cd22cc9bdf06f18f843cdfee9; reference:url,techhelplist.com/spam-list/974-intuit-browsers-update-malware; classtype:command-and-control; sid:2022119; rev:5; metadata:created_at 2015_11_19, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_28;)