alert tcp any any -> $HOME_NET [139,445] (msg:"ET MALWARE Suspected ExtraPulsar Backdoor"; flow:established,to_server; content:"ExPu"; depth:11; offset:4; content:"|90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90|"; distance:0; reference:url,github.com/zerosum0x0/smbdoor; classtype:trojan-activity; sid:2027370; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_05_21, deployment Internal, malware_family ExtraPulsar, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)