alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP Nivesro Cheat CnC Activity M1"; flow:established,to_server; http.uri; content:"authentication.php?a="; fast_pattern; content:"&b="; distance:0; http.accept; content:"text/*"; bsize:6; http.header_names; content:"|0d 0a|Accept|0d 0a|Host|0d 0a 0d 0a|"; reference:md5,6aaa1742b89bd72be6ee50709fc457ab; classtype:trojan-activity; sid:2033221; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_07_02, deployment Perimeter, confidence High, signature_severity Major, tag c2, updated_at 2021_07_02, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)