MALPEDIA_Win_Nullmixer_Auto

YARA detection rule by Felix Bilstein - yara-signator at cocacoding dot com · GPL-2.0

autogenerated rule brought to you by yara-signator

rule MALPEDIA_Win_Nullmixer_Auto: FILE {
  meta:
    description        = "autogenerated rule brought to you by yara-signator"
    author             = "Felix Bilstein - yara-signator at cocacoding dot com"
    id                 = "e761e8a0-6032-5175-8c62-373d3cfdbd32"
    date               = "2023-12-06"
    modified           = "2023-12-08"
    reference          = "https://malpedia.caad.fkie.fraunhofer.de/details/win.nullmixer"
    source_url         = "https://github.com/malpedia/signator-rules//blob/fbacfc09b84d53d410385e66a8e56f25016c588a/rules/win.nullmixer_auto.yar#L1-L133"
    license_url        = "N/A"
    logic_hash         = "ff19905731e10511745fb317854603fdd089737424883a407ad871400c764a1f"
    score              = 75
    quality            = 75
    tags               = "FILE"
    version            = "1"
    tool               = "yara-signator v0.6.0"
    signator_config    = "callsandjumps;datarefs;binvalue"
    malpedia_rule_date = "20231130"
    malpedia_hash      = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351"
    malpedia_version   = "20230808"
    malpedia_license   = "CC BY-SA 4.0"
    malpedia_sharing   = "TLP:WHITE"

  strings:
    $sequence_0 = { 66 83 fa 05 0f 87 26 01 00 00 83 e8 57 83 f8 ff 0f 85 d0 fc ff ff 8d 76 00 }
    $sequence_1 = { c7 44 24 04 ?? ?? ?? ?? c7 04 24 ?? ?? ?? ?? c7 05 ?? ?? ?? ?? d0 9d 4a 00 e8 ?? ?? ?? ?? c7 05 ?? ?? ?? ?? 01 00 00 00 83 ec 08 89 d9 }
    $sequence_2 = { a3 ?? ?? ?? ?? 8d 85 68 fe ff ff c7 44 24 08 ?? ?? ?? ?? c7 44 24 04 ?? ?? ?? ?? 89 04 24 e8 ?? ?? ?? ?? 8d 85 68 fe ff ff }
    $sequence_3 = { 89 01 8d 44 24 1f 89 44 24 08 e8 ?? ?? ?? ?? 31 d2 c7 40 08 00 00 00 00 83 c0 0c }
    $sequence_4 = { c7 84 24 50 01 00 00 00 00 00 00 31 c9 e9 ?? ?? ?? ?? 8b 8c 24 50 01 00 00 e8 ?? ?? ?? ?? b8 ff ff ff ff 8b 94 24 5c 01 00 00 }
    $sequence_5 = { 01 c9 89 6c 24 04 89 4c 24 08 89 04 24 e8 ?? ?? ?? ?? e9 ?? ?? ?? ?? 8b 44 24 48 }
    $sequence_6 = { 39 84 24 d0 00 00 00 0f 84 30 05 00 00 8b 06 c7 44 24 04 00 00 00 00 89 f1 0f b7 55 02 89 14 24 }
    $sequence_7 = { 83 f9 0f 0f 4f c8 8b 45 a8 39 75 ac 19 f8 0f 82 d0 00 00 00 8b 55 bc }
    $sequence_8 = { 83 ec 04 83 7d 80 10 8d 75 b4 0f 94 c2 8b 48 08 39 f9 89 4d 8c }
    $sequence_9 = { 89 f1 e8 ?? ?? ?? ?? 8b 06 89 f1 c7 04 24 2b 00 00 00 ff 50 18 52 }

  condition:
    7 of them and filesize < 2351104
}

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

8e8a7ec7-52eb-4cac-820d-182c56dfed29

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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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