alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING SUSPICIOUS UA (iexplore)"; flow:established,to_server; http.user_agent; content:"iexplore"; startswith; fast_pattern; nocase; http.host; content:!"su.pctools.com"; content:!".advent.com"; reference:md5,b0e8ce16c42dee20d2c1dfb1b87b3afc; classtype:bad-unknown; sid:2017365; rev:15; metadata:attack_target Client_Endpoint, created_at 2013_08_21, deployment Perimeter, deployment Internal, deployment SSLDecrypt, performance_impact Low, confidence Low, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_13; target:src_ip;)