win_revstealer_auto

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

Detects win.revstealer.

rule win_revstealer_auto {

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

    


    strings:
        $sequence_0 = { e8???????? 33f6 85c0 7507 32c0 e9???????? 48397330 }
                                                                                                
        $sequence_1 = { 488d4002 663928 75f5 41b94a000000 4c8d05b8360200 488d4c2420 e8???????? }
                                                                                                
        $sequence_2 = { 8b05???????? 3bc7 75f6 448bc6 488d9570080000 488d0d28d90300 e8???????? }
                                                                                                
        $sequence_3 = { 488bc8 ff15???????? 488d45c8 89742428 4c8d4d90 4889442420 }
                                                                                    
        $sequence_4 = { 483bd9 7ceb e9???????? 83ff10 0f8ea0000000 33d2 488d4d70 }
                                                                                                
        $sequence_5 = { 740d 4881fb00080000 0f87d6fcffff 498bcd e8???????? 488d95b0010000 498bcc }
                                                                                                
        $sequence_6 = { 4c3b4308 7290 488b3b 4885ff 7427 488b05???????? 4885c0 }
                                                                                                
        $sequence_7 = { 33d2 488bc8 ff15???????? 488b5de8 4885db 7427 488b05???????? }
                                                                                                
        $sequence_8 = { 4c8b4580 33d2 488bc8 ff15???????? 488b5c2468 4885db 7427 }
                                                                                                
        $sequence_9 = { 740c 4103f5 4903c5 4883f830 7ced 8b05???????? 33ff }
                                                                                                
    condition:
        7 of them and filesize < 737280
}

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

6c2ff709-736d-4a68-9b66-cace0f762b4d

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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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