win_cookiebag_auto

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

Detects win.cookiebag.

rule win_cookiebag_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.cookiebag."
        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.cookiebag"
        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???????? 68???????? e8???????? 83c404 8d4c242c 50 8b442438 }
                                                                                                
        $sequence_1 = { 81e6ff000000 8bc6 2bca c1e802 83f901 8a5c042c 7705 }
                                                                                                
        $sequence_2 = { 89642424 6a00 8806 8bce e8???????? 8b0d???????? 51 }
                                                                                                
        $sequence_3 = { c744247c00310000 e8???????? c744247000000000 8b35???????? 8b442470 8bc8 40 }
                                                                                                
        $sequence_4 = { 8b4508 51 50 50 e8???????? 83c40c 8bf8 }
                                                                                                
        $sequence_5 = { e8???????? 83c404 8bc5 8b8c24a0000000 5f 5e 5d }
                                                                                                
        $sequence_6 = { f3a4 8b4c2430 89442434 881c08 bf???????? 83c9ff 33c0 }
                                                                                                
        $sequence_7 = { 8d8c2480000000 c684246001000018 51 8b4d28 e8???????? 68???????? }
                                                                                    
        $sequence_8 = { 8bcd 50 c744244400000000 e8???????? 8b0d???????? c644244001 51 }
                                                                                                
        $sequence_9 = { c68424e800000010 51 6a00 50 8d4d30 }
                                                                        
    condition:
        7 of them and filesize < 311296
}

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

cf2c65b1-c384-4bfd-b96a-5d00f3e59846

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