rule win_milum_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.milum."
        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.milum"
        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 = { 81e1ff000080 7908 49 81c900ffffff 41 8bb48df0fbffff 89b405fcfbffff }
            // n = 7, score = 400
            //   81e1ff000080         | and                 ecx, 0x800000ff
            //   7908                 | jns                 0xa
            //   49                   | dec                 ecx
            //   81c900ffffff         | or                  ecx, 0xffffff00
            //   41                   | inc                 ecx
            //   8bb48df0fbffff       | mov                 esi, dword ptr [ebp + ecx*4 - 0x410]
            //   89b405fcfbffff       | mov                 dword ptr [ebp + eax - 0x404], esi

        $sequence_1 = { 8bda 899d38ffffff 6a00 e8???????? 83c404 2b8544ffffff 1b9548ffffff }
            // n = 7, score = 400
            //   8bda                 | mov                 ebx, edx
            //   899d38ffffff         | mov                 dword ptr [ebp - 0xc8], ebx
            //   6a00                 | push                0
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   2b8544ffffff         | sub                 eax, dword ptr [ebp - 0xbc]
            //   1b9548ffffff         | sbb                 edx, dword ptr [ebp - 0xb8]

        $sequence_2 = { 53 51 52 ffd0 84c0 0f8592000000 c645fc03 }
            // n = 7, score = 400
            //   53                   | push                ebx
            //   51                   | push                ecx
            //   52                   | push                edx
            //   ffd0                 | call                eax
            //   84c0                 | test                al, al
            //   0f8592000000         | jne                 0x98
            //   c645fc03             | mov                 byte ptr [ebp - 4], 3

        $sequence_3 = { 8b450c 8b55bc 8938 895004 8b4df4 64890d00000000 59 }
            // n = 7, score = 400
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   8b55bc               | mov                 edx, dword ptr [ebp - 0x44]
            //   8938                 | mov                 dword ptr [eax], edi
            //   895004               | mov                 dword ptr [eax + 4], edx
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx
            //   59                   | pop                 ecx

        $sequence_4 = { c645fc05 c645fc04 8dbd58ffffff e8???????? c645fc06 8bcc 89a528feffff }
            // n = 7, score = 400
            //   c645fc05             | mov                 byte ptr [ebp - 4], 5
            //   c645fc04             | mov                 byte ptr [ebp - 4], 4
            //   8dbd58ffffff         | lea                 edi, [ebp - 0xa8]
            //   e8????????           |                     
            //   c645fc06             | mov                 byte ptr [ebp - 4], 6
            //   8bcc                 | mov                 ecx, esp
            //   89a528feffff         | mov                 dword ptr [ebp - 0x1d8], esp

        $sequence_5 = { 50 8d442468 64a300000000 8b7d08 8bcf e8???????? 84c0 }
            // n = 7, score = 400
            //   50                   | push                eax
            //   8d442468             | lea                 eax, [esp + 0x68]
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   84c0                 | test                al, al

        $sequence_6 = { e8???????? 668b500e 66c1ea0a f6c201 7430 }
            // n = 5, score = 400
            //   e8????????           |                     
            //   668b500e             | mov                 dx, word ptr [eax + 0xe]
            //   66c1ea0a             | shr                 dx, 0xa
            //   f6c201               | test                dl, 1
            //   7430                 | je                  0x32

        $sequence_7 = { 8d450c 50 8d4d80 e8???????? c785e8feffffb8b44600 c785e8feffffc0b44600 c645fc0c }
            // n = 7, score = 400
            //   8d450c               | lea                 eax, [ebp + 0xc]
            //   50                   | push                eax
            //   8d4d80               | lea                 ecx, [ebp - 0x80]
            //   e8????????           |                     
            //   c785e8feffffb8b44600     | mov    dword ptr [ebp - 0x118], 0x46b4b8
            //   c785e8feffffc0b44600     | mov    dword ptr [ebp - 0x118], 0x46b4c0
            //   c645fc0c             | mov                 byte ptr [ebp - 4], 0xc

        $sequence_8 = { 39b42490000000 720d 8b54247c 52 e8???????? 83c404 8b442418 }
            // n = 7, score = 400
            //   39b42490000000       | cmp                 dword ptr [esp + 0x90], esi
            //   720d                 | jb                  0xf
            //   8b54247c             | mov                 edx, dword ptr [esp + 0x7c]
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8b442418             | mov                 eax, dword ptr [esp + 0x18]

        $sequence_9 = { 8b45f8 8b4de8 52 50 51 }
            // n = 5, score = 400
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8b4de8               | mov                 ecx, dword ptr [ebp - 0x18]
            //   52                   | push                edx
            //   50                   | push                eax
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 1076224
}