alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE KL-Remote / Cryp_Banker14 RAT response"; flow:established,from_server; dsize:6; content:"|3c 7c|OK|7c 3e|"; fast_pattern; flowbits:isset,ET.KLRemote; reference:md5,636edeba541483421e29b81b35f92841; reference:md5,c5763d0ef12dffa213d265596bd1acf9; reference:md5,5e01557b8650616e005a9949cbf5459a; classtype:trojan-activity; sid:2020316; rev:2; metadata:created_at 2015_01_27, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_10_08;)