alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible W32/VBKlip BAN Download"; flow:established,to_server; http.header; content:"Accept|20|Language|3a| en-us|0d 0a|"; fast_pattern; reference:url,cert.pl/news/8478/langswitch_lang/en; classtype:trojan-activity; sid:2018618; rev:3; metadata:created_at 2014_07_01, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_30;)