APT10_ChChes_lnk

YARA detection rule by JPCERT/CC Incident Response Group · NOASSERTION

LNK malware ChChes downloader

rule APT10_ChChes_lnk {
      meta:
        description = "LNK malware ChChes downloader"
        author = "JPCERT/CC Incident Response Group"
        hash = "6d910cd88c712beac63accbc62d510820f44f630b8281ee8b39382c24c01c5fe"

    	strings:
    		$v1a = "cmd.exe"
     		$v1b = "john-pc"
    		$v1c = "win-hg68mmgacjc"
        $v1d = "t-user-nb"
        $v1e = "C:\\Users\\suzuki\\Documents\\my\\card.rtf" wide

    	condition:
    		$v1a and ($v1b or $v1c or $v1d) or $v1e
}

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

1dd5f4ba-0905-4aea-b7ad-c76b31cf1ec8

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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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