rule win_meow_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.meow."
        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.meow"
        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 = { 6bc10b 99 f7fb 8d427f 99 f7fb 88943509ffffff }
            // n = 7, score = 100
            //   6bc10b               | imul                eax, ecx, 0xb
            //   99                   | cdq                 
            //   f7fb                 | idiv                ebx
            //   8d427f               | lea                 eax, [edx + 0x7f]
            //   99                   | cdq                 
            //   f7fb                 | idiv                ebx
            //   88943509ffffff       | mov                 byte ptr [ebp + esi - 0xf7], dl

        $sequence_1 = { 99 f7f9 85d2 0f857f000000 0f1f00 8b45f4 40 }
            // n = 7, score = 100
            //   99                   | cdq                 
            //   f7f9                 | idiv                ecx
            //   85d2                 | test                edx, edx
            //   0f857f000000         | jne                 0x85
            //   0f1f00               | nop                 dword ptr [eax]
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   40                   | inc                 eax

        $sequence_2 = { bb0c000000 56 8bf7 8d7b73 0f1f4000 8a06 }
            // n = 6, score = 100
            //   bb0c000000           | mov                 ebx, 0xc
            //   56                   | push                esi
            //   8bf7                 | mov                 esi, edi
            //   8d7b73               | lea                 edi, [ebx + 0x73]
            //   0f1f4000             | nop                 dword ptr [eax]
            //   8a06                 | mov                 al, byte ptr [esi]

        $sequence_3 = { 8945f4 8b45f4 99 f7fe 85d2 0f855bffffff 90 }
            // n = 7, score = 100
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   99                   | cdq                 
            //   f7fe                 | idiv                esi
            //   85d2                 | test                edx, edx
            //   0f855bffffff         | jne                 0xffffff61
            //   90                   | nop                 

        $sequence_4 = { 8d4c2411 51 8d8c24d0030000 51 ffd0 85c0 0f8426030000 }
            // n = 7, score = 100
            //   8d4c2411             | lea                 ecx, [esp + 0x11]
            //   51                   | push                ecx
            //   8d8c24d0030000       | lea                 ecx, [esp + 0x3d0]
            //   51                   | push                ecx
            //   ffd0                 | call                eax
            //   85c0                 | test                eax, eax
            //   0f8426030000         | je                  0x32c

        $sequence_5 = { 8a8579ffffff 80bd78ffffff00 897dcc 753a 33f6 0f1f840000000000 8a843579ffffff }
            // n = 7, score = 100
            //   8a8579ffffff         | mov                 al, byte ptr [ebp - 0x87]
            //   80bd78ffffff00       | cmp                 byte ptr [ebp - 0x88], 0
            //   897dcc               | mov                 dword ptr [ebp - 0x34], edi
            //   753a                 | jne                 0x3c
            //   33f6                 | xor                 esi, esi
            //   0f1f840000000000     | nop                 dword ptr [eax + eax]
            //   8a843579ffffff       | mov                 al, byte ptr [ebp + esi - 0x87]

        $sequence_6 = { 68000000c0 56 ffd0 6a5d 680038ab9a ba0f000000 894304 }
            // n = 7, score = 100
            //   68000000c0           | push                0xc0000000
            //   56                   | push                esi
            //   ffd0                 | call                eax
            //   6a5d                 | push                0x5d
            //   680038ab9a           | push                0x9aab3800
            //   ba0f000000           | mov                 edx, 0xf
            //   894304               | mov                 dword ptr [ebx + 4], eax

        $sequence_7 = { c68527ffffff04 c68528ffffff3b c68529ffffff17 c6852affffff3b c6852bffffff79 c6852cffffff3b c6852dffffff79 }
            // n = 7, score = 100
            //   c68527ffffff04       | mov                 byte ptr [ebp - 0xd9], 4
            //   c68528ffffff3b       | mov                 byte ptr [ebp - 0xd8], 0x3b
            //   c68529ffffff17       | mov                 byte ptr [ebp - 0xd7], 0x17
            //   c6852affffff3b       | mov                 byte ptr [ebp - 0xd6], 0x3b
            //   c6852bffffff79       | mov                 byte ptr [ebp - 0xd5], 0x79
            //   c6852cffffff3b       | mov                 byte ptr [ebp - 0xd4], 0x3b
            //   c6852dffffff79       | mov                 byte ptr [ebp - 0xd3], 0x79

        $sequence_8 = { c685c1fdffff73 c685c2fdffff3f c685c3fdffff40 c685c4fdffff3f c685c5fdffff3f c685c6fdffff3f 8a85bdfdffff }
            // n = 7, score = 100
            //   c685c1fdffff73       | mov                 byte ptr [ebp - 0x23f], 0x73
            //   c685c2fdffff3f       | mov                 byte ptr [ebp - 0x23e], 0x3f
            //   c685c3fdffff40       | mov                 byte ptr [ebp - 0x23d], 0x40
            //   c685c4fdffff3f       | mov                 byte ptr [ebp - 0x23c], 0x3f
            //   c685c5fdffff3f       | mov                 byte ptr [ebp - 0x23b], 0x3f
            //   c685c6fdffff3f       | mov                 byte ptr [ebp - 0x23a], 0x3f
            //   8a85bdfdffff         | mov                 al, byte ptr [ebp - 0x243]

        $sequence_9 = { c68588f8ffff68 c68589f8ffff44 c6858af8ffff68 c6858bf8ffff4e c6858cf8ffff68 c6858df8ffff68 c6858ef8ffff68 }
            // n = 7, score = 100
            //   c68588f8ffff68       | mov                 byte ptr [ebp - 0x778], 0x68
            //   c68589f8ffff44       | mov                 byte ptr [ebp - 0x777], 0x44
            //   c6858af8ffff68       | mov                 byte ptr [ebp - 0x776], 0x68
            //   c6858bf8ffff4e       | mov                 byte ptr [ebp - 0x775], 0x4e
            //   c6858cf8ffff68       | mov                 byte ptr [ebp - 0x774], 0x68
            //   c6858df8ffff68       | mov                 byte ptr [ebp - 0x773], 0x68
            //   c6858ef8ffff68       | mov                 byte ptr [ebp - 0x772], 0x68

    condition:
        7 of them and filesize < 492544
}