alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Blacktech Plead CnC Activity (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".aspx?m="; fast_pattern; pcre:"/^[0-9]{10}$/R"; http.user_agent; content:"Mozilla/4.0|20|(compatible|3b 20|MSIE|20|8.0|3b 20|Win32)"; bsize:41; http.header_names; content:!"Referer|0d 0a|"; reference:url,twitter.com/GlobalNTT_JP/status/1517061187107946496; classtype:trojan-activity; sid:2036315; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_04_22, deployment Perimeter, malware_family BlackTech, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_04_22;)