alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP W32/PicColor Adware CnC Beacon"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"?d="; content:"&format=json"; endswith; fast_pattern; http.header_names; content:!"Accept-"; content:!"Referer"; reference:md5,6b173406ffccaa6d0287b795f8de2073; classtype:pup-activity; sid:2020948; rev:6; metadata:attack_target Client_Endpoint, created_at 2015_04_20, deployment Perimeter, signature_severity Minor, tag c2, updated_at 2020_09_17, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)