win_maskgramstealer_auto

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

Detects win.maskgramstealer.

rule win_maskgramstealer_auto {

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

    


    strings:
        $sequence_0 = { 7437 48833d????????00 742d 48833d????????00 }
                                                            
        $sequence_1 = { 498d1400 8a02 3c5c 7404 }
                                                            
        $sequence_2 = { 498d1400 8a02 3c5c 7404 3c2f 7503 48ffc2 }
                                                                                                
        $sequence_3 = { 4531c9 428a0409 468a040a 448d50bf 4180fa19 7703 }
                                                                                    
        $sequence_4 = { 7404 39f0 7204 31c0 }
                                                            
        $sequence_5 = { 4180fa19 7703 83c020 458d50bf 4180fa19 7704 4183c020 }
                                                                                                
        $sequence_6 = { 31c0 b980000000 803d????????00 f3ab }
                                                            
        $sequence_7 = { 4438c0 74ea 4429c0 c3 }
                                                            
        $sequence_8 = { c3 803900 7405 48ffc1 ebf6 31c0 448a0402 }
                                                                                                
        $sequence_9 = { 48833d????????00 488905???????? 7437 48833d????????00 }
                                                            
    condition:
        7 of them and filesize < 353280
}

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

b72c63f1-63ac-41eb-a152-65ca82147411

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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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