MALPEDIA_Win_Decaf_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_Decaf_Auto: FILE {
  meta:
    description        = "autogenerated rule brought to you by yara-signator"
    author             = "Felix Bilstein - yara-signator at cocacoding dot com"
    id                 = "871b7c64-9bb1-5d5d-b760-fe69f683da0a"
    date               = "2023-12-06"
    modified           = "2023-12-08"
    reference          = "https://malpedia.caad.fkie.fraunhofer.de/details/win.decaf"
    source_url         = "https://github.com/malpedia/signator-rules//blob/fbacfc09b84d53d410385e66a8e56f25016c588a/rules/win.decaf_auto.yar#L1-L134"
    license_url        = "N/A"
    logic_hash         = "2f8679cf6195e76585744c378fca956597817fdb2b26b865768f35c66fced6eb"
    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 = { e8 ?? ?? ?? ?? e8 ?? ?? ?? ?? 48 89 84 24 a8 18 00 00 48 89 9c 24 40 06 00 00 48 8b 0d ?? ?? ?? ?? 48 89 8c 24 20 23 00 00 48 8d 05 43 04 0c 00 }
    $sequence_1 = { 4c 8b 44 24 70 48 89 c7 48 89 ce 48 8b 44 24 40 c7 04 1f ca cc ce c6 b9 05 00 00 00 e9 ?? ?? ?? ?? }
    $sequence_2 = { e9 ?? ?? ?? ?? 4c 8d 43 02 4c 39 c6 73 37 4c 89 44 24 68 48 8d 05 d8 a3 03 00 48 89 d9 }
    $sequence_3 = { c3 48 8d 05 82 76 1b 00 bb 10 00 00 00 e8 ?? ?? ?? ?? 48 89 f8 b9 00 20 00 00 e8 ?? ?? ?? ?? }
    $sequence_4 = { e8 ?? ?? ?? ?? 48 8b 8c 24 b8 04 00 00 48 89 48 08 83 3d ?? ?? ?? ?? 00 75 14 48 8b 8c 24 10 16 00 00 48 89 08 }
    $sequence_5 = { eb 1c 48 89 c7 48 8b 8c 24 f0 12 00 00 e8 ?? ?? ?? ?? 48 8d 3d 53 87 1f 00 e8 ?? ?? ?? ?? e8 ?? ?? ?? ?? }
    $sequence_6 = { e8 ?? ?? ?? ?? 48 8d 05 d4 ad 13 00 48 8d 1d 95 d2 19 00 e8 ?? ?? ?? ?? 4d 8d 68 30 4c 89 d6 4d 89 ea }
    $sequence_7 = { e9 ?? ?? ?? ?? 90 66 c7 44 24 4f 1c 14 0f b6 54 24 4f 88 54 24 45 44 0f b6 44 24 50 44 88 44 24 44 }
    $sequence_8 = { c6 04 1f 95 31 c9 e9 ?? ?? ?? ?? 49 83 f8 09 75 4d 4c 8d 43 01 4c 39 c6 }
    $sequence_9 = { e9 ?? ?? ?? ?? 48 89 5c 24 28 48 89 44 24 30 48 8d 0d 66 4c 1d 00 bf 0d 00 00 00 e8 ?? ?? ?? ?? 48 85 c0 }

  condition:
    7 of them and filesize < 7193600
}

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

95542aac-5cd3-4b41-8dff-4ca5e3eacb77

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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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