rule win_dragonbreath_auto {

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

    /* DISCLAIMER
     * The strings used in this rule have been automatically selected from the
     * disassembly of memory dumps and unpacked files, using YARA-Signator.
     * The code and documentation is published here:
     * https://github.com/fxb-cocacoding/yara-signator
     * As Malpedia is used as data source, please note that for a given
     * number of families, only single samples are documented.
     * This likely impacts the degree of generalization these rules will offer.
     * Take the described generation method also into consideration when you
     * apply the rules in your use cases and assign them confidence levels.
     */


    strings:
        $sequence_0 = { 8d9540fdffff 52 e8???????? 83c40c e8???????? 6a3f 50 }
            // n = 7, score = 100
            //   8d9540fdffff         | lea                 edx, [ebp - 0x2c0]
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   e8????????           |                     
            //   6a3f                 | push                0x3f
            //   50                   | push                eax

        $sequence_1 = { 83c8ff e9???????? 8bc6 c1f805 57 83e61f 8d3c8580fb0110 }
            // n = 7, score = 100
            //   83c8ff               | or                  eax, 0xffffffff
            //   e9????????           |                     
            //   8bc6                 | mov                 eax, esi
            //   c1f805               | sar                 eax, 5
            //   57                   | push                edi
            //   83e61f               | and                 esi, 0x1f
            //   8d3c8580fb0110       | lea                 edi, [eax*4 + 0x1001fb80]

        $sequence_2 = { 8be5 5d c20400 8bc2 ebc2 68???????? }
            // n = 6, score = 100
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c20400               | ret                 4
            //   8bc2                 | mov                 eax, edx
            //   ebc2                 | jmp                 0xffffffc4
            //   68????????           |                     

        $sequence_3 = { ff15???????? 8b7508 c7465c988f0110 83660800 33ff 47 897e14 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   c7465c988f0110       | mov                 dword ptr [esi + 0x5c], 0x10018f98
            //   83660800             | and                 dword ptr [esi + 8], 0
            //   33ff                 | xor                 edi, edi
            //   47                   | inc                 edi
            //   897e14               | mov                 dword ptr [esi + 0x14], edi

        $sequence_4 = { 8d4db8 8db5b8feffff e8???????? 8b450c }
            // n = 4, score = 100
            //   8d4db8               | lea                 ecx, [ebp - 0x48]
            //   8db5b8feffff         | lea                 esi, [ebp - 0x148]
            //   e8????????           |                     
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]

        $sequence_5 = { c645fc01 8b00 3bc3 7404 8b08 eb02 33c9 }
            // n = 7, score = 100
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   3bc3                 | cmp                 eax, ebx
            //   7404                 | je                  6
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   eb02                 | jmp                 4
            //   33c9                 | xor                 ecx, ecx

        $sequence_6 = { 8b4628 8b3d???????? c74624d8a60110 85c0 740a 6800800000 6a00 }
            // n = 7, score = 100
            //   8b4628               | mov                 eax, dword ptr [esi + 0x28]
            //   8b3d????????         |                     
            //   c74624d8a60110       | mov                 dword ptr [esi + 0x24], 0x1001a6d8
            //   85c0                 | test                eax, eax
            //   740a                 | je                  0xc
            //   6800800000           | push                0x8000
            //   6a00                 | push                0

        $sequence_7 = { 8d45f0 64a300000000 68???????? ff15???????? 8bf0 }
            // n = 5, score = 100
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   68????????           |                     
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax

        $sequence_8 = { 51 ff15???????? 46 3bb424dc110000 72e8 e9???????? }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   46                   | inc                 esi
            //   3bb424dc110000       | cmp                 esi, dword ptr [esp + 0x11dc]
            //   72e8                 | jb                  0xffffffea
            //   e9????????           |                     

        $sequence_9 = { a1???????? c705????????01440010 8935???????? a3???????? }
            // n = 4, score = 100
            //   a1????????           |                     
            //   c705????????01440010     |     
            //   8935????????         |                     
            //   a3????????           |                     

    condition:
        7 of them and filesize < 295936
}

rule win_dragonbreath_w0 {
    meta:
        author = "Elastic Security"
        id = "b27bc56b-41a2-4b3d-bff4-a14b90debe08"
        fingerprint = "4bc82f64191cf907d7ecf7da5453258c9be60e5dbaff770ebc22d9629bcbc7e2"
        creation_date = "2024-06-05"
        last_modified = "2024-06-12"
        threat_name = "Windows.Trojan.DragonBreath"
        reference_sample = "45023fd0e694d66c284dfe17f78c624fd7e246a6c36860a0d892d232a30949be"
        severity = 100
        arch_context = "x86"
        scan_context = "file, memory"
        license = "Elastic License v2"
        os = "windows"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.dragonbreath"
        malpedia_version = "20251118"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:CLEAR"
    strings:
        $a1 = { 50 6C 75 67 69 6E 4D 65 }
        $a2 = { 69 73 41 52 44 6C 6C }
        $a3 = { 25 64 2D 25 64 2D 25 64 20 25 64 3A 25 64 }
    condition:
        all of them
}