alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Backdoor family PCRat/Gh0st CnC traffic (OUTBOUND) 48"; flow:established,to_server; stream_size:server,<,5; dsize:>11; content:"|da 41|"; offset:8; byte_jump:4,-10,relative,little,from_beginning, post_offset -1; isdataat:!2,relative; pcre:"/^[\x20-\x7e]+?.{8}\xda\x41/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/PcClient.ZR&ThreatID=-2147325231; reference:md5,69ffa441a8c3cf4d8fe643174bebb51d; classtype:command-and-control; sid:2020607; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2015_03_04, 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_01;)