alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Ispen BADNEWS CnC Beacon"; flow:established,to_server; http.uri; content:".php"; endswith; http.header; content:"Windows NT"; http.accept; bsize:33; content:"application/x-www-form-urlencoded"; fast_pattern; http.content_type; bsize:33; content:"application/x-www-form-urlencoded"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:md5,570ea00465a45bf7b4e7e0b7007b87a1; reference:md5,f974bb8a5b5220a061cb92a16fc6a1c6; reference:url,unit42.paloaltonetworks.com/unit42-patchwork-continues-deliver-badnews-indian-subcontinent/; classtype:targeted-activity; sid:2030357; rev:6; metadata:attack_target Client_Endpoint, created_at 2016_06_03, deployment Perimeter, malware_family Win32_Ispen, signature_severity Major, tag c2, updated_at 2024_04_29, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)