alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Backdoor family PCRat/Gh0st CnC traffic (OUTBOUND) 36"; flow:established,to_server; stream_size:server,<,5; dsize:>11; content:"|79 da|"; offset:8; byte_jump:4,-10,relative,little,from_beginning, post_offset -1; isdataat:!2,relative; pcre:"/^[\x20-\x7e]+?.{8}\x79\xda/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:Win32/PcClient.ZR&ThreatID=-2147325231; reference:md5,5b50cc5215694841b9faea0fde472648; classtype:command-and-control; sid:2018636; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2014_07_03, 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;)