alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE PureCrypter Requesting Injector M2"; flow:to_server,established; http.method; content:"GET"; http.uri; pcre:"/\/\d{6,8}\/\w{2,5}_\w{8}\.bmp$/"; content:".bmp"; endswith; fast_pattern; reference:url,blog.netlab.360.com/purecrypter/; classtype:command-and-control; sid:2038690; rev:2; metadata:created_at 2022_08_31, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_09_03;)