ET EXPLOIT Possible ETERNALCHAMPION MS17-010 Sync Response

Query · suricata

flow:from_server,established;
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;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET EXPLOIT Possible ETERNALCHAMPION MS17-010 Sync Response · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert smb $HOME_NET any -> any any (
    msg:"ET EXPLOIT Possible ETERNALCHAMPION MS17-010 Sync Response";
    flow:from_server,established;
    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:5;
    metadata:attack_target SMB_Server, created_at 2017_04_17, deployment Internal, confidence Medium, signature_severity Critical, updated_at 2022_03_24;
)

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