rule win_badaudio_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.badaudio."
        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.badaudio"
        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 = { c7417800000000 c7417c0f000000 c6416800 c7818000000000000000 c7819000000000000000 c781940000000f000000 c6818000000000 }
            // n = 7, score = 300
            //   c7417800000000       | mov                 dword ptr [ecx + 0x78], 0
            //   c7417c0f000000       | mov                 dword ptr [ecx + 0x7c], 0xf
            //   c6416800             | mov                 byte ptr [ecx + 0x68], 0
            //   c7818000000000000000     | mov    dword ptr [ecx + 0x80], 0
            //   c7819000000000000000     | mov    dword ptr [ecx + 0x90], 0
            //   c781940000000f000000     | mov    dword ptr [ecx + 0x94], 0xf
            //   c6818000000000       | mov                 byte ptr [ecx + 0x80], 0

        $sequence_1 = { 89d7 c1c70f 8b74840c 89d3 c1c30d }
            // n = 5, score = 300
            //   89d7                 | mov                 edi, edx
            //   c1c70f               | rol                 edi, 0xf
            //   8b74840c             | mov                 esi, dword ptr [esp + eax*4 + 0xc]
            //   89d3                 | mov                 ebx, edx
            //   c1c30d               | rol                 ebx, 0xd

        $sequence_2 = { 89f2 eb17 8902 894204 894208 89c1 eb22 }
            // n = 7, score = 300
            //   89f2                 | mov                 edx, esi
            //   eb17                 | jmp                 0x19
            //   8902                 | mov                 dword ptr [edx], eax
            //   894204               | mov                 dword ptr [edx + 4], eax
            //   894208               | mov                 dword ptr [edx + 8], eax
            //   89c1                 | mov                 ecx, eax
            //   eb22                 | jmp                 0x24

        $sequence_3 = { 81fa00100000 721c 8b51fc 83c1fc 8955e0 }
            // n = 5, score = 300
            //   81fa00100000         | cmp                 edx, 0x1000
            //   721c                 | jb                  0x1e
            //   8b51fc               | mov                 edx, dword ptr [ecx - 4]
            //   83c1fc               | add                 ecx, -4
            //   8955e0               | mov                 dword ptr [ebp - 0x20], edx

        $sequence_4 = { 8baea8000000 8b4644 83f810 722c }
            // n = 4, score = 300
            //   8baea8000000         | mov                 ebp, dword ptr [esi + 0xa8]
            //   8b4644               | mov                 eax, dword ptr [esi + 0x44]
            //   83f810               | cmp                 eax, 0x10
            //   722c                 | jb                  0x2e

        $sequence_5 = { 732b 83c023 89d1 50 }
            // n = 4, score = 300
            //   732b                 | jae                 0x2d
            //   83c023               | add                 eax, 0x23
            //   89d1                 | mov                 ecx, edx
            //   50                   | push                eax

        $sequence_6 = { 83c414 5d c3 e8???????? 55 83ec14 8db524ffffff }
            // n = 7, score = 300
            //   83c414               | add                 esp, 0x14
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   e8????????           |                     
            //   55                   | push                ebp
            //   83ec14               | sub                 esp, 0x14
            //   8db524ffffff         | lea                 esi, [ebp - 0xdc]

        $sequence_7 = { c745f001000000 8d4dd4 8d45b8 50 56 }
            // n = 5, score = 300
            //   c745f001000000       | mov                 dword ptr [ebp - 0x10], 1
            //   8d4dd4               | lea                 ecx, [ebp - 0x2c]
            //   8d45b8               | lea                 eax, [ebp - 0x48]
            //   50                   | push                eax
            //   56                   | push                esi

        $sequence_8 = { 30dd 30fd 886c06fa 88cd 00cd c0f907 }
            // n = 6, score = 300
            //   30dd                 | xor                 ch, bl
            //   30fd                 | xor                 ch, bh
            //   886c06fa             | mov                 byte ptr [esi + eax - 6], ch
            //   88cd                 | mov                 ch, cl
            //   00cd                 | add                 ch, cl
            //   c0f907               | sar                 cl, 7

        $sequence_9 = { 7218 8b79fc 83c1fc 29f9 83f920 0f83a6010000 83c024 }
            // n = 7, score = 300
            //   7218                 | jb                  0x1a
            //   8b79fc               | mov                 edi, dword ptr [ecx - 4]
            //   83c1fc               | add                 ecx, -4
            //   29f9                 | sub                 ecx, edi
            //   83f920               | cmp                 ecx, 0x20
            //   0f83a6010000         | jae                 0x1ac
            //   83c024               | add                 eax, 0x24

    condition:
        7 of them and filesize < 1420288
}