alert tcp $HOME_NET any -> $EXTERNAL_NET ![80,443,9000] (msg:"ET MALWARE Backdoor family PCRat/Gh0st CnC traffic (OUTBOUND) 13"; flow:established,to_server; stream_size:server,<,5; byte_jump:4,0,little,from_beginning,post_offset -1; isdataat:!8,relative; byte_test:4,<,65535,0,little; byte_test:4,<,65535,4,little; content:"|7c 9e|"; offset:13; depth:8; pcre:"/^.{8}[\x20-\x7e]+?.{5}\x7c\x9e/s"; reference:url,www.securelist.com/en/descriptions/10155706/Trojan-GameThief.Win32.Magania.eogz; reference:url,www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=Backdoor%3AWin32%2FPcClient.ZR&ThreatID=-2147325231; reference:md5,6a6ef7b4c7e8300a73b206e32e14ce3c; classtype:command-and-control; sid:2017938; rev:8; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2014_01_08, deployment Perimeter, malware_family Gh0st, malware_family PCRAT, performance_impact Significant, confidence Medium, signature_severity Critical, tag PCRAT, tag Gh0st, tag RAT, updated_at 2021_09_09;)