GPL NETBIOS SMB InitiateSystemShutdown unicode little endian andx attempt

Query · suricata

flow:established,to_server;
flowbits:isset,smb.tree.bind.winreg;
content:"|00|"; depth:1;
content:"|FF|SMB"; within:4; distance:3;
pcre:"/^(\x75|\x2d|\x2f|\x73|\xa2|\x2e|\x24|\x74)/sR";
byte_test:1,&,128,6,relative;
content:"%"; depth:1; offset:39;
byte_jump:2,0,little,relative;
content:"&|00|"; within:2; distance:29;
content:"|5C 00|P|00|I|00|P|00|E|00 5C 00 00 00|"; distance:4; nocase;
byte_jump:2,-10,relative,from_beginning;
content:"|05|"; distance:4; within:1;
byte_test:1,!&,16,3,relative;
content:"|00|"; within:1; distance:1;
content:"|18 00|"; within:2; distance:19;

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

  • correlates · Suricata flowbits smb.tree.bind.winreg
    24 rules · view all
Raw source GPL NETBIOS SMB InitiateSystemShutdown unicode little endian andx attempt · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $EXTERNAL_NET any -> $HOME_NET 139 (
    msg:"GPL NETBIOS SMB InitiateSystemShutdown unicode little endian andx attempt";
    flow:established,to_server;
    flowbits:isset,smb.tree.bind.winreg;
    content:"|00|"; depth:1;
    content:"|FF|SMB"; within:4; distance:3;
    pcre:"/^(\x75|\x2d|\x2f|\x73|\xa2|\x2e|\x24|\x74)/sR";
    byte_test:1,&,128,6,relative;
    content:"%"; depth:1; offset:39;
    byte_jump:2,0,little,relative;
    content:"&|00|"; within:2; distance:29;
    content:"|5C 00|P|00|I|00|P|00|E|00 5C 00 00 00|"; distance:4; nocase;
    byte_jump:2,-10,relative,from_beginning;
    content:"|05|"; distance:4; within:1;
    byte_test:1,!&,16,3,relative;
    content:"|00|"; within:1; distance:1;
    content:"|18 00|"; within:2; distance:19;
    classtype:protocol-command-decode;
    sid:2102995; rev:6;
    metadata:created_at 2010_09_23, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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