win_cryptbot_auto

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

Detects win.cryptbot.

rule win_cryptbot_auto {

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

    


    strings:
        $sequence_0 = { 85c0 750e b9ca070200 e8???????? 8bc8 }
                                                                        
        $sequence_1 = { 895804 e8???????? c74004d0070000 e9???????? }
                                                            
        $sequence_2 = { 33c0 eb0a b917d90000 e8???????? }
                                                            
        $sequence_3 = { 84c0 7514 b800000002 e9???????? }
                                                            
        $sequence_4 = { 85c0 740a b9491a0100 e9???????? }
                                                            
        $sequence_5 = { 85f6 790e b9e2d80000 e8???????? 8907 }
                                                                        
        $sequence_6 = { 85c0 750f b955960100 e8???????? e9???????? }
                                                                        
        $sequence_7 = { 83f8ff 7407 c1e804 2401 8ad8 8ac3 }
                                                                                    
        $sequence_8 = { 7411 ffb6c4000000 6a00 50 e8???????? 83c40c 8bce }
                                                                                                
        $sequence_9 = { 7518 8b542414 83c718 8bcd }
                                                            
        $sequence_10 = { 83caff 8bcf e8???????? 83caff }
                                                            
        $sequence_11 = { 7424 807e4100 7404 33c0 }
                                                            
        $sequence_12 = { 750f 8a44245c 84c0 7507 }
                                                            
        $sequence_13 = { 7510 83be9c01000000 7507 8bce }
                                                            
        $sequence_14 = { 85c0 742c 8bd6 8bcb }
                                                            
        $sequence_15 = { 741e 8b491c 8b442434 803c0800 7411 33c0 39442438 }
                                                                                                
        $sequence_16 = { 750b 8bce e8???????? 8b4c2428 }
                                                            
        $sequence_17 = { 744e 0fb74802 83e103 3bcb }
                                                            
        $sequence_18 = { 8b5720 8bce e8???????? 8b5724 }
                                                            
        $sequence_19 = { 8b4d18 8901 895104 e9???????? 8b4508 }
                                                                        
        $sequence_20 = { 8b4d20 894c2468 8b4d5c 894c2464 }
                                                            
        $sequence_21 = { 8b95acfeffff 33c0 3802 7406 }
                                                            
        $sequence_22 = { 8b959cfeffff 8bca 85d2 742a }
                                                            
        $sequence_23 = { 8b4d18 8b09 81c1fc030000 8b448808 }
                                                            
        $sequence_24 = { 8b95a0feffff 6a00 6a00 8b08 }
                                                            
        $sequence_25 = { 8b959cfeffff 8b85acfeffff 33c9 3808 }
                                                            
        $sequence_26 = { 8b4d34 894c245c dd85b8fbffff dd5c2454 }
                                                            
        $sequence_27 = { 8b4d18 8b09 83c101 81c1fc030000 }
                                                            
        $sequence_28 = { 8b4d24 894c247c dd85b0fbffff dd5c2474 }
                                                            
        $sequence_29 = { 8b4d34 894c2470 8b4d64 894c246c }
                                                            
        $sequence_30 = { 8b4d28 898d30ffffff 8b958c000000 89952cffffff }
                                                            
        $sequence_31 = { 8b958cfeffff 2bc2 8bb5a0feffff 03f0 8a02 }
                                                                        
    condition:
        7 of them and filesize < 17138688
}

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

c75c4e4f-70fe-4d2d-9282-44b5f4126cbe

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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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