alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"MALWARE [PTsecurity] REMCOS pkt checker 0"; flow:established, to_server; dsize:200<>910; stream_size:client,>,200; stream_size:client, <,911; stream_size:server,=,1; flowbits:set,FB180732_0; flowbits:noalert; metadata:former_category TROJAN; classtype:trojan-activity; reference:url, github.com/ptresearch/AttackDetection; sid:11003611; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, deployment Perimeter, signature_severity Major, created_at 2017_09_11, malware_family Remcos, performance_impact Moderate, updated_at 2017_10_12;)