ESET_Onimiki

YARA detection rule by Olivier Bilodeau <bilodeau@eset.com> · BSD 2-Clause

Linux/Onimiki malicious DNS server

rule ESET_Onimiki: LINUX_ONIMIKI {
  meta:
    description = "Linux/Onimiki malicious DNS server"
    author      = "Olivier Bilodeau <bilodeau@eset.com>"
    id          = "3a99799f-fbb4-5fee-a796-3310acd10e17"
    date        = "2014-02-06"
    modified    = "2014-04-04"
    reference   = "https://github.com/eset/malware-ioc/"
    source_url  = "https://github.com/eset/malware-ioc/blob/21381c70ad030105cf9edb092dfd1cae29753286/windigo/windigo-onimiki.yar#L32-L59"
    license_url = "https://github.com/eset/malware-ioc/blob/21381c70ad030105cf9edb092dfd1cae29753286/LICENSE"
    logic_hash  = "eac30f5c9a9606d1d0e14c55e0532c54976fbb0d2e4f5cd2d9f719b77e07161a"
    score       = 75
    quality     = 80
    tags        = "LINUX/ONIMIKI"
    malware     = "Linux/Onimiki"
    operation   = "Windigo"
    contact     = "windigo@eset.sk"
    license     = "BSD 2-Clause"

  strings:
    $a1 = { 43 0F B6 74 2A 0E 43 0F B6 0C 2A 8D 7C 3D 00 8D }
    $a2 = { 74 35 00 8D 4C 0D 00 89 F8 41 F7 E3 89 F8 29 D0 }
    $a3 = { D1 E8 01 C2 89 F0 C1 EA 04 44 8D 0C 92 46 8D 0C }
    $a4 = { 8A 41 F7 E3 89 F0 44 29 CF 29 D0 D1 E8 01 C2 89 }
    $a5 = { C8 C1 EA 04 44 8D 04 92 46 8D 04 82 41 F7 E3 89 }
    $a6 = { C8 44 29 C6 29 D0 D1 E8 01 C2 C1 EA 04 8D 04 92 }
    $a7 = { 8D 04 82 29 C1 42 0F B6 04 21 42 88 84 14 C0 01 }
    $a8 = { 00 00 42 0F B6 04 27 43 88 04 32 42 0F B6 04 26 }
    $a9 = { 42 88 84 14 A0 01 00 00 49 83 C2 01 49 83 FA 07 }

  condition:
    all of them
}

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

4636f08a-1ee3-40d4-aa62-a751499e8adb

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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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