SUSP_DLL_Duplicated_First_ExportNames

YARA detection rule by Greg Lesnewich · GPL-2.0

track a weird TTP abused by DPRK operators, where a trojanized binary will use a duplicated or incremented export name

import "pe"
rule SUSP_DLL_Duplicated_First_ExportNames {
  meta:
    author      = "Greg Lesnewich"
    description = "track a weird TTP abused by DPRK operators, where a trojanized binary will use a duplicated or incremented export name"
    date        = "2024-01-04"
    version     = "1.0"
    DaysOfYara  = "6/100"
    hash        = "c8707d9d7f3ade7f8aa25034e6a73060e5998db980e90452eb0190994036d781"      hash        = "26a2fa7b45a455c311fd57875d8231c853ea4399be7b9344f2136030b2edc4aa"      hash        = "ec254c40abff00b104a949f07b7b64235fc395ecb9311eb4020c1c4da0e6b5c4"      hash        = "722fa0c893b39fef787b7bc277c979d29adc1525d77dd952f0cc61cd4d0597cc"      hash        = "84b5a89917792291e2425b64e093580ca8d2e106532e433e949cdde3c2db4053"      hash        = "39ad9ae3780c2f6d41b1897e78f2b2b6d549365f5f024bc68d1fe794b940f9f1"  
  condition:
    pe.number_of_exports < 5 and
    (
      ((pe.export_details[1].name startswith pe.export_details[0].name) and
        pe.export_details[1].name endswith "W") or

      ((pe.export_details[2].name startswith pe.export_details[0].name) and
        pe.export_details[2].name endswith "W") or

      ((pe.export_details[2].name startswith pe.export_details[1].name) and
        pe.export_details[2].name endswith "W")
    )

}

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

78ac966f-8787-4211-a617-0f71488cec57

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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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