alert http [$HOME_NET,$HTTP_SERVERS] any -> $EXTERNAL_NET any (msg:"ET MALWARE ELF/AbcBot CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/api/postip"; fast_pattern; http.request_body; content:"OS|3a|"; content:"CPU|3a|"; distance:0; content:"os-name|3a|"; distance:0; content:"lanip|3a|"; distance:0; reference:url,blog.netlab.360.com/abcbot_an_evolving_botnet_en/; classtype:command-and-control; sid:2034502; rev:1; metadata:affected_product Linux, created_at 2021_11_18, malware_family AbcBot, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_11_18;)