Hunting_LNK_Win_GenericLauncher

YARA detection rule by FireEye · BSD-2-Clause

Signature to detect LNK files or OLE objects with embedded LNK files and generic launcher commands, except powershell which is large enough to have its own gene

rule Hunting_LNK_Win_GenericLauncher
{
    meta:
        date = "09/04/2018"
        description = "Signature to detect LNK files or OLE objects with embedded LNK files and generic launcher commands, except powershell which is large enough to have its own gene"
        md5 = "14dd758e8f89f14612c8df9f862c31e4"
        rev = 7
        author = "FireEye"
    strings:
        $a01 = "cmd.exe /" ascii nocase wide
        $a02 = "cscript" ascii nocase wide
        $a03 = "jscript" ascii nocase wide
        $a04 = "wscript" ascii nocase wide
        $a05 = "wmic" ascii nocase wide
        $a07 = "mshta" ascii nocase wide
        $header = { 4C 00 00 00 01 14 02 }
    condition:
        (($header at 0) or ((uint32(0) == 0xE011CFD0) and $header)) and (1 of ($a*))
}

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

b6d6d3e9-b5cf-4185-b229-bd9833fa37c0

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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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