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; to_lowercase; content:!"|0d 0a|accept-"; content:!"|0d 0a|content-type|0d 0a|"; content:!"|0d 0a|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:5; metadata:created_at 2015_04_16, signature_severity Major, updated_at 2024_04_20;)