IMPLANT_2_v3

YARA detection rule by US CERT · GPL-2.0

CORESHELL/SOURFACE Implant by APT28

rule IMPLANT_2_v3 {
   meta:
      description = "CORESHELL/SOURFACE Implant by APT28"
      author = "US CERT"
      reference = "https://www.us-cert.gov/ncas/current-activity/2017/02/10/Enhanced-Analysis-GRIZZLY-STEPPE"
      date = "2017-02-10"
      score = 85
   strings:
      $STR1 = {C1 EB 07 8D ?? 01 32 1C ?? 33 D2 }
      $STR2 = {2B ?? 83 ?? 06 0F 83 ?? 00 00 00 EB 02 33 }
      $STR3 = {89 ?? ?? 89 ?? ?? 89 55 ?? 89 45 ?? 3B ?? 0F 83 ?? 00 00 00 8D
         ?? ?? 8D ?? ?? FE }
   condition:
      (uint16(0) == 0x5A4D) and any of them
}

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

ccb5d7e3-c830-4fc3-ba13-2e5fabe5108b

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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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