alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Backdoor family PCRat/Gh0st CnC traffic (OUTBOUND) 100"; flow:established,to_server; app-layer-protocol:!tls; stream_size:server,<,5; dsize:>11; content:"|78 9c|"; offset:13; depth:2; byte_jump:4,-15,relative,little,from_beginning,post_offset -1; isdataat:!2,relative; pcre:"/^.{8}[\x20-\x7e]{5}\x78\x9c/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,db1c4342f617798bcb2ba5655d32bf67; classtype:command-and-control; sid:2021012; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2015_04_27, deployment Perimeter, malware_family Gh0st, malware_family PCRAT, performance_impact Significant, confidence Medium, signature_severity Critical, tag PCRAT, tag Gh0st, tag RAT, updated_at 2024_07_03;)