alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP Bundleware Spyware CHM Download"; flow:established,to_server; http.referer; content:"ms-its|3a|mhtml|3a|file|3a|//C|3a|counter.mht!http|3a|//"; fast_pattern; startswith; nocase; http.header; content:"/counter/HELP3.CHM|3a 3a|/help.htm"; nocase; classtype:pup-activity; sid:2001452; rev:12; metadata:created_at 2010_07_30, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_07;)