Rule History

alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Backdoor family PCRat/Gh0st CnC traffic (OUTBOUND) 57"; flow:established,to_server; stream_size:server,<,5; dsize:>11; content:"|7b 9f|"; offset:8; byte_jump:4,-10,relative,little,from_beginning, post_offset -1; isdataat:!2,relative; pcre:"/^[\x20-\x7e]+?.{8}\x7b\x9f/s"; reference:url,www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=Backdoor:Win32/PcClient.ZR&ThreatID=-2147325231; reference:md5,06be359c6e6396fe105e8b59ac5a992e; classtype:command-and-control; sid:2020692; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2015_03_14, 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;)