GPL NETBIOS SMB-DS IrotIsRunning unicode little endian andx attempt


Query · suricata

flow:established,to_server;
flowbits:isset,smb.tree.bind.irot;
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,-17,relative,from_beginning,little;
isdataat:4,relative;
content:"|05|";
byte_test:1,&,16,3,relative;
content:"|00|"; within:1; distance:1;
content:"|02 00|"; within:2; distance:19;
byte_jump:4,8,relative,little,align;
byte_test:4,>,1024,0,little;

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 GPL NETBIOS SMB-DS IrotIsRunning 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 445 (
    msg:"GPL NETBIOS SMB-DS IrotIsRunning unicode little endian andx attempt";
    flow:established,to_server;
    flowbits:isset,smb.tree.bind.irot;
    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,-17,relative,from_beginning,little;
    isdataat:4,relative;
    content:"|05|";
    byte_test:1,&,16,3,relative;
    content:"|00|"; within:1; distance:1;
    content:"|02 00|"; within:2; distance:19;
    byte_jump:4,8,relative,little,align;
    byte_test:4,>,1024,0,little;
    reference:bugtraq,6005;
    reference:cve,2002-1561;
    reference:url,www.microsoft.com/technet/security/bulletin/MS03-010.mspx;
    classtype:protocol-command-decode;
    sid:2103271; rev:5;
    metadata:created_at 2010_09_23, cve CVE_2002_1561, confidence Medium, signature_severity Informational, updated_at 2019_07_26;
)

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