alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP ThunderUnion Install Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"peerid="; content:"&userid="; distance:0; content:"referfrom="; distance:0; content:"&OS="; distance:0; content:"&OSversion="; distance:0; content:"productname="; distance:0; http.user_agent; content:"ThunderUnion"; bsize:12; fast_pattern; reference:md5,ae4c9b58510bd358745caf3b7ad81003; classtype:pup-activity; sid:2033896; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_09_03, deployment Perimeter, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_03, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1496, mitre_technique_name Resource_Hijacking;)