alert tcp $HOME_NET any -> $EXTERNAL_NET [!5800] (msg:"ET MALWARE Backdoor family PCRat/Gh0st CnC traffic (OUTBOUND) 6"; flow:established,to_server; stream_size:server,<,5; dsize:>11; content:"|78 9c|"; fast_pattern; byte_extract:4,0,compressed_size,little; byte_test:4,>,compressed_size,4,little; byte_jump:4,0,little,from_beginning,post_offset -1; isdataat:!2,relative; pcre:"/^.{8}[\x20-\x7e]+?[\x00]*?\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%2FPcClient.ZR&ThreatID=-2147325231; classtype:command-and-control; sid:2017877; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2013_12_17, 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;)