shellcode

YARA detection rule by nex · GPL-2.0

Matched shellcode byte patterns

import "pe"
rule shellcode
{
    meta:
        author = "nex"
        description = "Matched shellcode byte patterns"
        modified = "Glenn Edwards (@hiddenillusion)"
    strings:
        $s0 = { 64 8b 64 }
        $s1 = { 64 a1 30 }
        $s2 = { 64 8b 15 30 }
        $s3 = { 64 8b 35 30 }
        $s4 = { 55 8b ec 83 c4 }
        $s5 = { 55 8b ec 81 ec }
        $s6 = { 55 8b ec e8 }
        $s7 = { 55 8b ec e9 }
    condition:
        for any of ($s*) : ($ at pe.entry_point)	
}

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

c0f1339b-40be-45e8-a9f7-0f01566c7797

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

[[ reason ]]

What does this mean?

Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

[[ reason ]]

What do these messages mean?

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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