alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE W2KM_BARTALEX Downloading Payload M2"; flow:established,from_server; flowbits:isset,ET.BARTALEX; content:"text/plain|0d 0a 0d 0a|http"; fast_pattern; http.stat_code; content:"200"; file.data; content:"http"; within:4; pcre:"/^s?\x3a\x2f+[^\r\n\s]+\.exe/Ri"; classtype:trojan-activity; sid:2021532; rev:4; metadata:created_at 2015_07_24, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_01;)