alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Tinba Checkin 2"; flow:established,to_server; urilen:>1; flowbits:set,ET.Tinba.Checkin; content:"|0d 0a 0d 0a|"; content:!"|00 00 00 00|"; within:4; content:!"|FF FF FF FF|"; within:4; byte_extract:2,2,Tinba.Pivot,relative; byte_test:2,=,Tinba.Pivot,2,relative; byte_test:2,!=,Tinba.Pivot,5,relative; http.method; content:"POST"; http.uri; content:"/"; endswith; http.content_len; byte_test:0,>,99,0,string,dec; http.protocol; content:"HTTP/1.0"; http.header_names; content:"|0d 0a|Host|0d 0a|Content-Length|0d 0a 0d 0a|"; fast_pattern; content:!"User-Agent"; content:!"Accept"; reference:md5,7af6d8de2759b8cc534ffd72fdd8a654; classtype:command-and-control; sid:2020418; rev:7; metadata:created_at 2015_02_12, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_14;)