alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP MSIL/Adload.AT Beacon"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/impression.do"; fast_pattern; content:"source="; content:"&event="; content:"&implementation_id="; content:"user_id="; content:"&useragent="; content:"&sgn="; content:"&subid2="; content:"&ts="; http.header_names; content:!"Referer"; content:!"Accept"; reference:md5,d15069e44ec849ab26bcefffe6867f10; reference:md5,4ececc2f027a096c2100ec1125d0d151; classtype:pup-activity; sid:2022893; rev:8; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_06_13, deployment Perimeter, malware_family MSIL_Adload, signature_severity Minor, tag Adware, tag c2, updated_at 2020_08_31, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)