MALPEDIA_Win_Reactorbot_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_Reactorbot_Auto: FILE {
  meta:
    description        = "autogenerated rule brought to you by yara-signator"
    author             = "Felix Bilstein - yara-signator at cocacoding dot com"
    id                 = "db667bb6-5a2a-5433-bb3f-44b94a1b8ccd"
    date               = "2023-12-06"
    modified           = "2023-12-08"
    reference          = "https://malpedia.caad.fkie.fraunhofer.de/details/win.reactorbot"
    source_url         = "https://github.com/malpedia/signator-rules//blob/fbacfc09b84d53d410385e66a8e56f25016c588a/rules/win.reactorbot_auto.yar#L1-L159"
    license_url        = "N/A"
    logic_hash         = "a8dd74cde779dbd1edde8ec6ea240ea579363dd37eac297b9622688e884b36e8"
    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  = { 50 ff 15 ?? ?? ?? ?? 8d 8d 90 fd ff ff 51 8d 95 80 f9 ff ff }
    $sequence_1  = { c7 45 f4 00 00 00 00 c7 45 e8 00 00 00 00 c7 45 e4 00 00 00 00 a1 ?? ?? ?? ?? 89 45 e0 }
    $sequence_2  = { 74 18 6a ff a1 ?? ?? ?? ?? 50 ff 15 ?? ?? ?? ?? }
    $sequence_3  = { 83 7d fc ff 74 11 8b 4d fc 51 ff 15 ?? ?? ?? ?? }
    $sequence_4  = { 8b 4d 08 51 ff 15 ?? ?? ?? ?? 83 c4 04 89 45 f0 }
    $sequence_5  = { 8b 45 08 50 68 04 01 00 00 8d 8d 78 f7 ff ff 51 e8 ?? ?? ?? ?? }
    $sequence_6  = { ff 15 ?? ?? ?? ?? 89 45 fc 83 7d fc 00 74 79 83 7d fc ff }
    $sequence_7  = { 74 20 8b 0d ?? ?? ?? ?? 51 8b 15 ?? ?? ?? ?? 52 }
    $sequence_8  = { 83 c0 05 99 b9 05 00 00 00 f7 f9 }
    $sequence_9  = { 6b c0 05 83 e8 03 99 b9 99 00 00 00 }
    $sequence_10 = { 69 c0 b1 3a 02 00 99 83 e2 03 03 c2 }
    $sequence_11 = { e8 ?? ?? ?? ?? 83 3d ?? ?? ?? ?? 00 75 09 83 3d ?? ?? ?? ?? 00 74 0b }
    $sequence_12 = { eb 0c c7 05 ?? ?? ?? ?? b8 0b 00 00 eb 0a c7 05 ?? ?? ?? ?? e8 03 00 00 }
    $sequence_13 = { 83 e1 01 f7 d9 81 e1 20 83 b8 ed 33 c1 }
    $sequence_14 = { 48 3d 00 08 00 00 73 23 48 63 44 24 50 48 8b 4c 24 68 0f b6 09 88 8c 04 e0 03 00 00 }
    $sequence_15 = { 83 e2 03 03 c2 c1 f8 02 89 44 24 10 8b 4c 24 0c }

  condition:
    7 of them and filesize < 1032192
}

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

71591cb4-471a-475f-bdd1-af60000acba6

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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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