rule win_soundbill_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.soundbill."
        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.soundbill"
        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 = { e8???????? 85c0 740a b8ff000000 e9???????? 488d15ab930200 488d0d2c930200 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   85c0                 | lea                 edx, [0x2d10e]
            //   740a                 | and                 eax, 0x3f
            //   b8ff000000           | dec                 eax
            //   e9????????           |                     
            //   488d15ab930200       | lea                 ecx, [eax + eax*8]
            //   488d0d2c930200       | dec                 eax

        $sequence_1 = { e8???????? 488d0d25500300 4883c428 e9???????? 4053 4883ec20 b901000000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   488d0d25500300       | mov                 eax, dword ptr [ebp + 0x1a0]
            //   4883c428             | dec                 eax
            //   e9????????           |                     
            //   4053                 | mov                 ecx, dword ptr [eax + 0x88]
            //   4883ec20             | dec                 eax
            //   b901000000           | lea                 eax, [0x22505]

        $sequence_2 = { e8???????? 488d05f1660300 4533c0 488bd3 488905???????? 488d0d15e50400 e8???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   488d05f1660300       | dec                 ebp
            //   4533c0               | add                 esp, eax
            //   488bd3               | dec                 esp
            //   488905????????       |                     
            //   488d0d15e50400       | mov                 dword ptr [ebp - 0x71], esp
            //   e8????????           |                     

        $sequence_3 = { c745c856145e56 66c745cc563a c7450043726561 c7450474654669 c745086c654d61 }
            // n = 5, score = 100
            //   c745c856145e56       | subsd               xmm1, xmm2
            //   66c745cc563a         | mulsd               xmm1, qword ptr [ecx + eax*8]
            //   c7450043726561       | movapd              xmm2, xmm1
            //   c7450474654669       | dec                 eax
            //   c745086c654d61       | lea                 ecx, [0x23ab8]

        $sequence_4 = { 4883ec20 488d1dc7a80300 488d3dc0a80300 eb12 488b03 }
            // n = 5, score = 100
            //   4883ec20             | dec                 eax
            //   488d1dc7a80300       | mov                 ecx, edx
            //   488d3dc0a80300       | call                dword ptr [eax + 0x30]
            //   eb12                 | jmp                 0x4d6
            //   488b03               | dec                 esp

        $sequence_5 = { 4963c8 488d1489 498d1cd2 4803df 33c9 0fb6440b18 48ffc1 }
            // n = 7, score = 100
            //   4963c8               | dec                 eax
            //   488d1489             | mov                 dword ptr [ecx], eax
            //   498d1cd2             | test                dl, 1
            //   4803df               | je                  0x3e1
            //   33c9                 | inc                 eax
            //   0fb6440b18           | push                ebx
            //   48ffc1               | dec                 eax

        $sequence_6 = { 4053 4883ec20 488bd9 488bc2 488d0d8daa0200 48890b }
            // n = 6, score = 100
            //   4053                 | dec                 esp
            //   4883ec20             | lea                 ebx, [esp + 0x150]
            //   488bd9               | dec                 ecx
            //   488bc2               | mov                 ebx, dword ptr [ebx + 0x30]
            //   488d0d8daa0200       | dec                 ecx
            //   48890b               | mov                 esi, dword ptr [ebx + 0x38]

        $sequence_7 = { 488bd9 488bc2 488d0d8daa0200 48890b 488d5308 33c9 48890a }
            // n = 7, score = 100
            //   488bd9               | dec                 esp
            //   488bc2               | lea                 esi, [0x251b5]
            //   488d0d8daa0200       | dec                 eax
            //   48890b               | mov                 eax, dword ptr [ebx + 0x10]
            //   488d5308             | mov                 dword ptr [ebx + 0x48], ebp
            //   33c9                 | inc                 dword ptr [ebx + 0x468]
            //   48890a               | cmp                 dword ptr [ebx + 0x468], 2

        $sequence_8 = { 48c745bf00000000 48c745c70f000000 c645af00 440fb6c6 ba01000000 488d4daf e8???????? }
            // n = 7, score = 100
            //   48c745bf00000000     | dec                 eax
            //   48c745c70f000000     | inc                 eax
            //   c645af00             | dec                 eax
            //   440fb6c6             | mov                 dword ptr [ebx], eax
            //   ba01000000           | jae                 0x1835
            //   488d4daf             | dec                 eax
            //   e8????????           |                     

        $sequence_9 = { 49ffc5 41ffc7 488d45af 4883fe10 490f43c6 803c387f 747d }
            // n = 7, score = 100
            //   49ffc5               | inc                 ecx
            //   41ffc7               | push                edi
            //   488d45af             | dec                 eax
            //   4883fe10             | lea                 ebp, [eax - 0xf8]
            //   490f43c6             | dec                 eax
            //   803c387f             | sub                 esp, 0x1e0
            //   747d                 | dec                 eax

    condition:
        7 of them and filesize < 973824
}