alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"MALWARE [PTsecurity] REMCOS pkt checker 2"; flow:established, to_server; dsize:42<>270; stream_size:server, <,35; stream_size:server, >,25; stream_size:client, >,246; stream_size:client, <,1210; flowbits:isset, FB180732_1; flowbits:unset,FB180732_1; flowbits:set,FB180732_2; flowbits:noalert; metadata:former_category TROJAN; classtype:trojan-activity; reference:url, github.com/ptresearch/AttackDetection; sid:11003613; rev:10; 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 Significant, updated_at 2018_04_11;)