MALPEDIA_Win_Cryptomix_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_Cryptomix_Auto: FILE {
  meta:
    description        = "autogenerated rule brought to you by yara-signator"
    author             = "Felix Bilstein - yara-signator at cocacoding dot com"
    id                 = "9865a2c1-f352-5196-8a74-a585373e6231"
    date               = "2023-12-06"
    modified           = "2023-12-08"
    reference          = "https://malpedia.caad.fkie.fraunhofer.de/details/win.cryptomix"
    source_url         = "https://github.com/malpedia/signator-rules//blob/fbacfc09b84d53d410385e66a8e56f25016c588a/rules/win.cryptomix_auto.yar#L1-L173"
    license_url        = "N/A"
    logic_hash         = "2b59fc336b11257878a1c3e0c2e35ea57cb53b57126b62f006b040ede13bda6d"
    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  = { c3 68 f0 76 7c 2a 6a 04 e8 ?? ?? ?? ?? 59 59 }
    $sequence_1  = { 02 f8 0f b6 cf 8d 76 01 0f b6 04 39 88 46 ff 88 14 39 33 c9 }
    $sequence_2  = { e8 ?? ?? ?? ?? 59 eb 03 8b 5d f0 ff 75 f8 e8 ?? ?? ?? ?? }
    $sequence_3  = { 75 04 6a 08 eb 35 83 f8 04 }
    $sequence_4  = { ff 4d 08 8b 4d fc 8a d8 75 cc 5f }
    $sequence_5  = { 59 59 ff d0 83 f8 7a 74 13 56 57 }
    $sequence_6  = { 56 68 3f 00 0f 00 56 56 56 53 57 }
    $sequence_7  = { ff d0 c3 68 6e a4 ff a5 6a 05 }
    $sequence_8  = { ff d6 85 c0 0f 85 6a 01 00 00 68 ?? ?? ?? ?? 8d 85 c4 f9 ff ff }
    $sequence_9  = { 83 7d 0c 01 8b bd b8 f9 ff ff a1 ?? ?? ?? ?? 68 ?? ?? ?? ?? }
    $sequence_10 = { 68 ?? ?? ?? ?? 57 ff d0 ff 75 fc e8 ?? ?? ?? ?? }
    $sequence_11 = { 8b f1 6a 01 89 95 84 ef ff ff 89 b5 8c ef ff ff 89 85 88 ef ff ff ff 15 ?? ?? ?? ?? 68 08 02 00 00 }
    $sequence_12 = { 8d 85 c4 f9 ff ff 50 ff d7 85 c0 74 60 68 ?? ?? ?? ?? }
    $sequence_13 = { 8b 35 ?? ?? ?? ?? 68 00 7d 00 00 6a 40 c7 45 f8 e8 03 00 00 }
    $sequence_14 = { 6a 00 6a 00 ff 15 ?? ?? ?? ?? 68 96 00 00 00 ff 15 ?? ?? ?? ?? 8b 9d 80 ef ff ff 8d 85 98 f9 ff ff }
    $sequence_15 = { 68 ?? ?? ?? ?? 56 e8 ?? ?? ?? ?? 59 59 85 c0 77 59 }

  condition:
    7 of them and filesize < 188416
}

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

3f8fb58e-b2eb-410a-baa6-ef4d01f877df

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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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