MAL_Cisco_RayInitiator_Stage_3_LINE_VIPER_ShellCode

YARA detection rule by NCSC · NOASSERTION

Detects RayInitiator GRUB bootkit stage 3 deploy phase code that copies LINE VIPER shellcode stub and marks executable.

rule MAL_Cisco_RayInitiator_Stage_3_LINE_VIPER_ShellCode {
   meta:
      author = "NCSC"
      description = "Detects RayInitiator GRUB bootkit stage 3 deploy phase code that copies LINE VIPER shellcode stub and marks executable."
      date = "2025-09-25"
      reference = "https://www.ncsc.gov.uk/static-assets/documents/malware-analysis-reports/RayInitiator-LINE-VIPER/ncsc-mar-rayinitiator-line-viper.pdf"
      score = 85
   strings:
      $xc1 = {
         48 89 FA 48 83 C7 40 4C 89 CE B9 D0 01 00 00 F3 A4 48
         89 D7 48 83 C7 40 48 89 3A 48 C1 EF 0C 48 C1 E7 0C BA
         07 00 00 00 48 C7 C6 00 20 00 00
      }
   condition:
      $xc1
}

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

2e15ea38-b8f9-4717-b3c5-6029572e9b1c

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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

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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.

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

[[ currentRule.title ]]

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