win_tofsee_auto

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

Detects win.tofsee.

rule win_tofsee_auto {

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

    


    strings:
        $sequence_0 = { ff75fc ffd7 85c0 0f84f2000000 0fb7859cfeffff 8b4dbc 56 }
                                                                                                
        $sequence_1 = { 50 ff7570 e8???????? 59 59 ff7568 ff756c }
                                                                                                
        $sequence_2 = { 8bce ff5004 8bf0 ff7608 ff15???????? 85c0 750d }
                                                                                                
        $sequence_3 = { 53 50 ff7514 c60702 e8???????? 83c410 85c0 }
                                                                                                
        $sequence_4 = { 57 6a07 33c9 8bc2 }
                                                            
        $sequence_5 = { 6a00 6a00 ff7564 8d852cffffff 6880000000 50 e8???????? }
                                                                                                
        $sequence_6 = { 7443 8b5dfc 85db 7433 837d0c00 742d 57 }
                                                                                                
        $sequence_7 = { 8bf7 741c 8b1e 53 ff742418 55 e8???????? }
                                                                                                
        $sequence_8 = { 50 ff15???????? 8d4564 50 8d4550 50 ff15???????? }
                                                                                                
        $sequence_9 = { e8???????? 80781000 75d4 56 8bcb e8???????? 837d0c03 }
                                                                                                
    condition:
        7 of them and filesize < 147456
}

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

16900068-1d68-44d2-80f5-4adc5ee2f5c5

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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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