alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET 443 (msg:"ET MALWARE ELF/Facefish Session Closing (400)"; flow:established,to_server; flowbits:isset,ET.facefish; dsize:8; content:"|00 00 00 04 00 00 00 00|"; reference:url,blog.netlab.360.com/ssh_stealer_facefish_en; reference:md5,38fb322cc6d09a6ab85784ede56bc5a7; reference:md5,63dc3037bf0022e2d281f0463529bf60; classtype:trojan-activity; sid:2033112; rev:3; metadata:affected_product Mac_OSX, affected_product Linux, attack_target Client_Endpoint, created_at 2021_06_07, deployment Perimeter, malware_family ELF_Facefish, confidence Medium, signature_severity Major, tag RAT, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_17;)