APT_NK_Scarcruft_evolved_ROKRAT

YARA detection rule by S2WLAB_TALON_JACK2 · NOASSERTION

Detects RokRAT malware used by ScarCruft APT group

rule APT_NK_Scarcruft_evolved_ROKRAT {
    meta:
        author        = "S2WLAB_TALON_JACK2"
        description   = "Detects RokRAT malware used by ScarCruft APT group"
        type          = "APT"
        version       = "0.1"
        date          = "2021-07-09"
        reference = "https://medium.com/s2wlab/matryoshka-variant-of-rokrat-apt37-scarcruft-69774ea7bf48"
        id = "53cabf41-0154-5372-b667-60d8a7cb9806"
    strings:

        $AES_IV_KEY = {
        C7 44 24 ?? 32 31 12 23
        C7 44 24 ?? 34 45 56 67
        C7 44 24 ?? 78 89 9A AB
        C7 44 24 ?? 0C BD CE DF
        C7 45 ?? 2B 7E A5 16
        C7 45 ?? 28 AE D2 A6
        C7 45 ?? AB F7 15 88
        C7 45 ?? 09 CF 4F 3C
        }

       $url_deocde = {
               80 E9 0F
               80 F1 C8
               88 48 ??
               48 83 EA 01  }
    condition:
        uint16(0) == 0x5A4D and
        any of them
}

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

67d4185e-6349-44d1-96fb-dfe4c04a18da

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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 ]]

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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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