win_ymir_auto

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

Detects win.ymir.

rule win_ymir_auto {

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

    


    strings:
        $sequence_0 = { 4c89ea 4c89e1 488d052c682800 42ff14f0 }
                                                            
        $sequence_1 = { 4c89ea 4c89e1 488d0530c00900 48c7436800000000 }
                                                            
        $sequence_2 = { 4c89ea 4c89e1 488b9880000000 ff9088000000 }
                                                            
        $sequence_3 = { 4c89ea 4c89e1 488b7028 498b4500 ff5078 }
                                                                        
        $sequence_4 = { 4c89ea 4c89e1 488b80f0000000 4883c428 }
                                                            
        $sequence_5 = { 4c89ea 4c89e1 488d0529a90900 48c7436800000000 }
                                                            
        $sequence_6 = { 4c89ea 4c89e1 488db0a8feffff 66480f6ed0 }
                                                            
        $sequence_7 = { 4c89ea 4c89e1 488d0591be0900 c7435818000000 }
                                                            
    condition:
        7 of them and filesize < 5530624
}

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

60ce4410-1e04-444e-9d0a-664cd5fd7b66

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