alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE CryptoLocker EXE Download"; flow:to_server,established; http.uri; content:"/crypt_"; content:"sell"; distance:0; content:".exe"; distance:0; pcre:"/\/crypt_[^\/]*?sell[^\/]*?\d\.exe$/"; classtype:trojan-activity; sid:2017583; rev:6; metadata:created_at 2013_10_12, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_27;)