rule win_dragonbreath_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { c745e000000000 68???????? ff15???????? 8bf0 }
            // n = 4, score = 100
            //   c745e000000000       | mov                 dword ptr [ebp - 0x20], 0
            //   68????????           |                     
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax

        $sequence_1 = { 85ff 7507 c605????????da 85db 7409 53 e8???????? }
            // n = 7, score = 100
            //   85ff                 | test                edi, edi
            //   7507                 | jne                 9
            //   c605????????da       |                     
            //   85db                 | test                ebx, ebx
            //   7409                 | je                  0xb
            //   53                   | push                ebx
            //   e8????????           |                     

        $sequence_2 = { 8d9541feffff 52 e8???????? 83c40c }
            // n = 4, score = 100
            //   8d9541feffff         | lea                 edx, [ebp - 0x1bf]
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_3 = { 57 68???????? ff15???????? 8b1d???????? 8bf0 68???????? }
            // n = 6, score = 100
            //   57                   | push                edi
            //   68????????           |                     
            //   ff15????????         |                     
            //   8b1d????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   68????????           |                     

        $sequence_4 = { 6a00 6a00 c686f000000001 ff15???????? }
            // n = 4, score = 100
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   c686f000000001       | mov                 byte ptr [esi + 0xf0], 1
            //   ff15????????         |                     

        $sequence_5 = { 0175fc 6a1e 81c700200000 ff15???????? 8b45f8 2d00200000 8945f8 }
            // n = 7, score = 100
            //   0175fc               | add                 dword ptr [ebp - 4], esi
            //   6a1e                 | push                0x1e
            //   81c700200000         | add                 edi, 0x2000
            //   ff15????????         |                     
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   2d00200000           | sub                 eax, 0x2000
            //   8945f8               | mov                 dword ptr [ebp - 8], eax

        $sequence_6 = { 8d5601 52 e8???????? a0???????? 83c40c 57 56 }
            // n = 7, score = 100
            //   8d5601               | lea                 edx, [esi + 1]
            //   52                   | push                edx
            //   e8????????           |                     
            //   a0????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   57                   | push                edi
            //   56                   | push                esi

        $sequence_7 = { 83c408 85c0 75e7 50 68???????? ff15???????? }
            // n = 6, score = 100
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   75e7                 | jne                 0xffffffe9
            //   50                   | push                eax
            //   68????????           |                     
            //   ff15????????         |                     

        $sequence_8 = { e8???????? 68???????? ff15???????? 8b7508 c7465c988f0110 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   68????????           |                     
            //   ff15????????         |                     
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   c7465c988f0110       | mov                 dword ptr [esi + 0x5c], 0x10018f98

        $sequence_9 = { 8d4f04 51 ff15???????? c70794160000 }
            // n = 4, score = 100
            //   8d4f04               | lea                 ecx, [edi + 4]
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   c70794160000         | mov                 dword ptr [edi], 0x1694

    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
}