alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Bamital Checkin Response 2"; flow:established,to_client; file.data; content:"$$$$"; fast_pattern; pcre:"/^<(?P<var1>[a-z])>[a-z0-9/]+<\/(?P=var1)><(?P<var2>[a-z])>[a-z0-9/]+<\/(?P=var2)>$$$$/i"; classtype:command-and-control; sid:2019758; rev:4; metadata:created_at 2014_11_20, signature_severity Major, updated_at 2024_03_14;)