alert http $HOME_NET any -> $EXTERNAL_NET any (
msg:"ET ADWARE_PUP klm123.com Spyware User Agent";
flow:established,to_server;
http.user_agent;
content:"{"; depth:1; fast_pattern;
pcre:"/\{[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}\}/i";
http.host;
content:!"directory.gladinet.com";
content:!"ff.avast.com";
content:!"ispringsolutions.com";
content:!"cdn.download.comodo.com";
content:!"liveupdate.symantec.com";
content:!"liveupdate.norton.com";
classtype:pup-activity;
sid:2007616; rev:17;
metadata:created_at 2010_07_30, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_03_23;
)