alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Zacom/NFlog HTTP POST Connectivity Check"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/STTip.asp"; fast_pattern; http.content_len; byte_test:0,=,0,0,string,dec; http.header_names; content:!"Accept-"; content:!"Content-Type|0d 0a|"; content:!"Referer|0d 0a|"; reference:url,researchcenter.paloaltonetworks.com/2015/04/unit-42-identifies-new-dragonok-backdoor-malware-deployed-against-japanese-targets/; classtype:trojan-activity; sid:2020924; rev:4; metadata:created_at 2015_04_16, signature_severity Major, updated_at 2020_05_21;)