alert tcp $HOME_NET any -> $EXTERNAL_NET !443 (msg:"ET MALWARE Backdoor family PCRat/Gh0st CnC traffic (OUTBOUND) 103"; flow:established,to_server; app-layer-protocol:!tls; stream_size:server,<,5; dsize:>11; content:"|78 9c|"; offset:9; fast_pattern; byte_jump:4,-10,relative,from_beginning,post_offset -1; isdataat:!2,relative; pcre:"/^[\x20-\x7e]+?.{8}\x78\x9c/s"; reference:md5,b0c2a5a3cfef4e759979b7d0869b7612; reference:url,researchcenter.paloaltonetworks.com/2015/09/musical-chairs-multi-year-campaign-involving-new-variant-of-gh0st-malware/; classtype:command-and-control; sid:2021753; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2015_09_09, 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;)