alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Fake Software Download Redirect Leading to Malware M1"; flow:established,to_server; http.request_line; content:"GET|20|/?s="; startswith; fast_pattern; content:"&q="; distance:0; content:"&g="; distance:0; pcre:"/^[a-f0-9]{32}/R"; http.header_names; content:!"User-Agent"; content:!"Accept|0d 0a|"; reference:md5,9284526d864c785b1d6bedd7830e8c19; reference:url,news.sophos.com/en-us/2021/09/01/fake-pirated-software-sites-serve-up-malware-droppers-as-a-service/; classtype:trojan-activity; sid:2033953; rev:1; metadata:created_at 2021_09_15, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_15;)