win_calmthorn_auto

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

Detects win.calmthorn.

rule win_calmthorn_auto {

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

    


    strings:
        $sequence_0 = { eb1e 8b95e42fffff 83c201 8b85e82fffff 83d000 8995e42fffff 8985e82fffff }
                                                                                                
        $sequence_1 = { ebba 0fb68d2cfdffff 83f901 7552 c785a0c2ffff00000000 eb0f 8b95a0c2ffff }
                                                                                                
        $sequence_2 = { ebba 0fb695a6fdffff 83fa01 7553 0f57c0 660f13858498ffff eb1e }
                                                                                                
        $sequence_3 = { e8???????? 83c404 398524ecffff 7d20 8b85e4eeffff 83c001 8985e4eeffff }
                                                                                                
        $sequence_4 = { ebba 0fb69568fdffff 83fa01 7552 c785e4e2ffff00000000 eb0f 8b85e4e2ffff }
                                                                                                
        $sequence_5 = { ebba 0fb68d3ffdffff 83f901 7553 0f57c0 660f1385bc4dffff eb1e }
                                                                                                
        $sequence_6 = { e8???????? 83c404 39855cdeffff 7d20 8b8df4f7ffff 83c101 898df4f7ffff }
                                                                                                
        $sequence_7 = { eb02 ebba 0fb68d16fdffff 83f901 7556 0f57c0 660f13859423ffff }
                                                                                                
        $sequence_8 = { ebbb 0fb68d33fdffff 83f901 7552 c785fcc4ffff00000000 eb0f 8b95fcc4ffff }
                                                                                                
        $sequence_9 = { 8b8d5c1bffff 83c101 8b95601bffff 83d200 898d5c1bffff 8995601bffff 83bd601bffffff }
                                                                                                
    condition:
        7 of them and filesize < 2322432
}

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

9aa4eb0d-73c2-4da4-83d3-d74b726ed408

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