win_ransomexx_auto

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

Detects win.ransomexx.

rule win_ransomexx_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.ransomexx."
        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.ransomexx"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    


    strings:
        $sequence_0 = { 56 57 8b7d08 33db 895dfc 85ff 0f84da010000 }
                                                                                                
        $sequence_1 = { 85c0 7403 50 ffd7 5f 85f6 7532 }
                                                                                                
        $sequence_2 = { 7410 817df8f0070000 7507 56 ff15???????? 5b 56 }
                                                                                                
        $sequence_3 = { 85c0 7435 5f 5e 5b 8be5 }
                                                                                    
        $sequence_4 = { 742b 3bfe 7227 8b4d08 56 51 8d541818 }
                                                                                                
        $sequence_5 = { 33c9 8908 894804 894808 89480c c74010d89e05c1 }
                                                                                    
        $sequence_6 = { 8b5510 51 8b4f04 52 8b5014 51 ffd2 }
                                                                                                
        $sequence_7 = { 735c 8d3c40 2bd0 8dbcbda0f9ffff }
                                                            
        $sequence_8 = { 89542414 8b3d???????? 56 6a00 ffd7 50 ff15???????? }
                                                                                                
        $sequence_9 = { 83e63f 8845ff 884dfd 8855fe b838000000 83fe38 }
                                                                                    
    condition:
        7 of them and filesize < 372736
}

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

24861f85-f3c5-4245-a340-f64fc4c12082

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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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