alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Zacom/NFlog HTTP POST Fake UA CnC Beacon"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".asp"; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|MSIE 6.0|3b 20|Windows NT 5.0|3b 20|.NET CLR 1.1.4322|29 |"; startswith; endswith; fast_pattern; http.header_names; to_lowercase; content:!"|0d 0a|accept-"; content:!"|0d 0a|referer|0d 0a|"; content:!"|0d 0a|content-type|0d 0a|"; reference:url,researchcenter.paloaltonetworks.com/2015/04/unit-42-identifies-new-dragonok-backdoor-malware-deployed-against-japanese-targets/; classtype:command-and-control; sid:2020925; rev:7; metadata:attack_target Client_Endpoint, created_at 2015_04_16, deployment Perimeter, signature_severity Major, tag c2, updated_at 2024_05_01, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)