win_ufrstealer_auto

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

Detects win.ufrstealer.

rule win_ufrstealer_auto {

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

    


    strings:
        $sequence_0 = { 8b45e4 ff30 68???????? 68???????? ff15???????? 83c40c }
                                                                                    
        $sequence_1 = { 8bc8 8d8500f4ffff 48 03c1 80383a 7505 c60000 }
                                                                                                
        $sequence_2 = { 40 3bc7 72f2 eb1e 8b75e8 46 8975e8 }
                                                                                                
        $sequence_3 = { b9???????? 800408fb 40 3bc7 }
                                                            
        $sequence_4 = { 8b4df4 c1e902 51 8b048d6c9a4200 8945f8 ff75f8 6a00 }
                                                                                                
        $sequence_5 = { 894df8 ff75f8 ff15???????? 50 }
                                                            
        $sequence_6 = { ff75f4 ff75f8 ff15???????? 6a00 6a00 6a00 ff75f8 }
                                                                                                
        $sequence_7 = { 68???????? 6a04 8d45d8 50 ff35???????? ff15???????? }
                                                                                    
        $sequence_8 = { 68???????? e8???????? 8305????????02 6a02 68???????? e8???????? 8305????????02 }
                                                                                                
        $sequence_9 = { 0f8443e7ffff a3???????? 68???????? ff35???????? ff15???????? 85c0 0f8425e7ffff }
                                                                                                
    condition:
        7 of them and filesize < 770048
}

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

e4c83453-a590-4762-838f-30bee2d77bce

Propose edits, view related rules, and engage with the community through comments.

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 ]]

Community Discussion