win_nymaim2_auto

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

Detects win.nymaim2.

rule win_nymaim2_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.nymaim2."
        info = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.nymaim2"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    


    strings:
        $sequence_0 = { c20800 b8???????? e8???????? 51 53 8b1d???????? 56 }
                                                                                                
        $sequence_1 = { e8???????? e8???????? 59 3ac3 59 7525 68???????? }
                                                                                                
        $sequence_2 = { 8d4df0 5e 6a0a 6a10 8975fc e8???????? }
                                                                                    
        $sequence_3 = { 894658 894654 894650 894e48 8d4e5c c645fc04 }
                                                                                    
        $sequence_4 = { c745fc07000000 e8???????? 8bf8 8a45f3 53 8d4dd4 8845d4 }
                                                                                                
        $sequence_5 = { 53 8b35???????? 53 c645fc02 ff750c 57 53 }
                                                                                                
        $sequence_6 = { 25ff000000 0fb6c0 c1e208 0bd0 8911 c7460432000000 8b4e20 }
                                                                                                
        $sequence_7 = { 8d45f0 8bcc 8965d0 50 e8???????? 8d45b0 }
                                                                                    
        $sequence_8 = { 83c002 8945b0 c746041e000000 8b4e20 83f903 7d3b 8b06 }
                                                                                                
        $sequence_9 = { 8d4dec c645fc06 e8???????? 8d4de8 c645fc04 e8???????? 8d45c4 }
                                                                                                
    condition:
        7 of them and filesize < 753664
}

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

ad039d4d-fbee-4ca0-aa88-e1c8eaa97742

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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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