alert smb $HOME_NET any -> any any (msg:"ET EXPLOIT Possible ETERNALCHAMPION MS17-010 Sync Response"; flow:established,to_client; flowbits:isset,ET.ETERNALCHAMPIONsync; content:"|ff|SMB|25 00 00 00 00 98 03 c0 00 00 00 00 00 00 00 00 00 00 00 00|"; offset:4; depth:24; fast_pattern; content:"|7c 00|"; distance:32; within:2; content:"|00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00|"; within:20; content:"|00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00|"; distance:100; within:20; content:"|00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00|"; distance:100; within:20; content:"|00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00|"; distance:100; within:20; content:"|00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00|"; endswith; classtype:trojan-activity; sid:2024213; rev:6; metadata:attack_target SMB_Server, created_at 2017_04_17, deployment Internal, confidence Medium, signature_severity Critical, updated_at 2024_03_07;)