win_sappycache_auto

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

Detects win.sappycache.

rule win_sappycache_auto {

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

    


    strings:
        $sequence_0 = { f6c101 7412 b9c1000000 ff15???????? 33c0 e9???????? 410fb74614 }
                                                                                                
        $sequence_1 = { 7509 418b4e38 f6c101 7412 b9c1000000 ff15???????? 33c0 }
                                                                                                
        $sequence_2 = { 8bea 0f1f8000000000 e8???????? 448bf0 }
                                                            
        $sequence_3 = { 488bcf ff15???????? 33c0 488bac2480000000 488b5c2478 488bbc2488000000 488b4c2450 }
                                                                                                
        $sequence_4 = { 33db 4c8bfa 4c8be1 4883fa40 7312 b90d000000 }
                                                                                    
        $sequence_5 = { 33d2 488d4d40 41b800010000 e8???????? 33d2 488d8d40010000 41b800010000 }
                                                                                                
        $sequence_6 = { e9???????? 4d3bc1 0f84a3000000 8b7500 498b9cf720860100 4885db 7407 }
                                                                                                
        $sequence_7 = { 754c 488d15131a0100 498bcc ff15???????? 488d15631a0100 488d0d4c610100 ff15???????? }
                                                                                                
        $sequence_8 = { 482be0 488b05???????? 4833c4 48898520620000 4c89442468 }
                                                                        
        $sequence_9 = { 488d05133c0100 ffcb 488d0c9b 488d0cc8 ff15???????? ff0d???????? 85db }
                                                                                                
    condition:
        7 of them and filesize < 262144
}

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

3660d9c4-442c-4b29-8b29-fcaf3fa09036

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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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