alert http $HOME_NET any -> $EXTERNAL_NET any (
msg:"ET ADWARE_PUP OSX/Adware.Pirrit CnC Activity 3";
flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/rl?tm=";
content:"&id=";
content:"&cu=";
content:"&ci=";
content:"&cv=";
content:"&iv=";
content:"&pchid=";
content:"&ug=";
http.header_names;
content:!"Referer|0d 0a|";
reference:url,www.cybereason.com/blog/targetingedge-mac-os-x-pirrit-malware-adware-still-active;
classtype:pup-activity;
sid:2033028; rev:1;
metadata:affected_product Mac_OSX, attack_target Client_Endpoint, created_at 2021_05_25, deployment Perimeter, performance_impact Low, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_25;
)