MALPEDIA_Win_Yahoyah_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_Yahoyah_Auto: FILE {
  meta:
    description        = "autogenerated rule brought to you by yara-signator"
    author             = "Felix Bilstein - yara-signator at cocacoding dot com"
    id                 = "8071f7bc-1af0-58b6-8984-8add890e5a04"
    date               = "2023-12-06"
    modified           = "2023-12-08"
    reference          = "https://malpedia.caad.fkie.fraunhofer.de/details/win.yahoyah"
    source_url         = "https://github.com/malpedia/signator-rules//blob/fbacfc09b84d53d410385e66a8e56f25016c588a/rules/win.yahoyah_auto.yar#L1-L158"
    license_url        = "N/A"
    logic_hash         = "5a0539481a7f5653801a561ffa29165f1f4bf92248a27b13820a8f2035c6eb1c"
    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  = { ff 15 ?? ?? ?? ?? 6a 02 53 6a f0 }
    $sequence_1  = { 50 68 00 08 00 00 ff 15 ?? ?? ?? ?? ff 15 ?? ?? ?? ?? }
    $sequence_2  = { 53 53 56 53 ff 15 ?? ?? ?? ?? 68 d0 07 00 00 }
    $sequence_3  = { 50 e8 ?? ?? ?? ?? 83 c4 18 6a 02 53 }
    $sequence_4  = { ff 15 ?? ?? ?? ?? 6a 2e 68 ?? ?? ?? ?? e8 ?? ?? ?? ?? }
    $sequence_5  = { e8 ?? ?? ?? ?? 59 53 53 6a 03 0f b7 c8 }
    $sequence_6  = { 52 c1 e8 08 23 c1 50 68 ?? ?? ?? ?? }
    $sequence_7  = { ff 15 ?? ?? ?? ?? 85 c0 75 01 c3 56 }
    $sequence_8  = { 23 d1 52 8b d0 c1 ea 18 52 0f b6 d0 }
    $sequence_9  = { eb 19 ff 15 ?? ?? ?? ?? 0f b7 c0 50 68 ?? ?? ?? ?? }
    $sequence_10 = { 6a 1a 50 e8 ?? ?? ?? ?? bf ?? ?? ?? ?? }
    $sequence_11 = { ff 15 ?? ?? ?? ?? 6a 3a 56 e8 ?? ?? ?? ?? 8b f0 83 c4 10 }
    $sequence_12 = { 90 33 c9 33 c0 64 8b 35 30 00 00 00 8b 76 0c }
    $sequence_13 = { 90 68 ad d1 34 41 ff b5 3f fb ff ff 6a 00 e8 ?? ?? ?? ?? 89 85 21 f1 ff ff e8 ?? ?? ?? ?? }
    $sequence_14 = { 90 90 90 90 90 68 ad d1 34 41 ff b5 3f fb ff ff }

  condition:
    7 of them and filesize < 483328
}

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

e26e3596-7b91-4fa9-af24-ece7948ca21c

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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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