rule win_whitebird_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.whitebird."
        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.whitebird"
        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 = { eb09 80f92f 0f95c1 80c13f }
            // n = 4, score = 400
            //   eb09                 | jmp                 0xb
            //   80f92f               | cmp                 cl, 0x2f
            //   0f95c1               | setne               cl
            //   80c13f               | add                 cl, 0x3f

        $sequence_1 = { ff15???????? 4963fc 488bcb c744242801000000 }
            // n = 4, score = 200
            //   ff15????????         |                     
            //   4963fc               | lea                 edi, [esp + 0xa0]
            //   488bcb               | dec                 ecx
            //   c744242801000000     | mov                 ecx, edi

        $sequence_2 = { ff15???????? 488b1e 33ed 483bde }
            // n = 4, score = 200
            //   ff15????????         |                     
            //   488b1e               | mov                 dword ptr [esp + 0x30], eax
            //   33ed                 | dec                 eax
            //   483bde               | lea                 eax, [esp + 0x40]

        $sequence_3 = { 488b4d18 480304d1 eb79 33c0 488dbc24a0000000 498bcf f2ae }
            // n = 7, score = 200
            //   488b4d18             | dec                 eax
            //   480304d1             | mov                 ecx, dword ptr [ebp + 0x18]
            //   eb79                 | dec                 eax
            //   33c0                 | add                 eax, dword ptr [ecx + edx*8]
            //   488dbc24a0000000     | jmp                 0x7b
            //   498bcf               | xor                 eax, eax
            //   f2ae                 | dec                 eax

        $sequence_4 = { 834dfcff 8bc8 a3???????? e8???????? bf???????? 57 ff15???????? }
            // n = 7, score = 200
            //   834dfcff             | or                  dword ptr [ebp - 4], 0xffffffff
            //   8bc8                 | mov                 ecx, eax
            //   a3????????           |                     
            //   e8????????           |                     
            //   bf????????           |                     
            //   57                   | push                edi
            //   ff15????????         |                     

        $sequence_5 = { 44887803 894804 837e1c00 488bd8 7450 4983c8ff 33c0 }
            // n = 7, score = 200
            //   44887803             | inc                 esp
            //   894804               | lea                 eax, [edx - 0x2d]
            //   837e1c00             | inc                 ecx
            //   488bd8               | mov                 edx, esp
            //   7450                 | mov                 edi, 0x11
            //   4983c8ff             | dec                 esp
            //   33c0                 | lea                 edx, [0x7ffe]

        $sequence_6 = { 418bd4 bf11000000 4c8d15fe7f0000 6bd211 8bc2 }
            // n = 5, score = 200
            //   418bd4               | mov                 ecx, ebx
            //   bf11000000           | mov                 dword ptr [esp + 0x28], 1
            //   4c8d15fe7f0000       | dec                 esp
            //   6bd211               | mov                 ecx, ebx
            //   8bc2                 | dec                 eax

        $sequence_7 = { a1???????? 83c410 85c0 7405 8b4004 eb02 }
            // n = 6, score = 200
            //   a1????????           |                     
            //   83c410               | add                 esp, 0x10
            //   85c0                 | test                eax, eax
            //   7405                 | je                  7
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   eb02                 | jmp                 4

        $sequence_8 = { eb3f 6a54 ebd2 83e864 742a 48 }
            // n = 6, score = 200
            //   eb3f                 | jmp                 0x41
            //   6a54                 | push                0x54
            //   ebd2                 | jmp                 0xffffffd4
            //   83e864               | sub                 eax, 0x64
            //   742a                 | je                  0x2c
            //   48                   | dec                 eax

        $sequence_9 = { 56 43 53 e8???????? 53 }
            // n = 5, score = 200
            //   56                   | push                esi
            //   43                   | inc                 ebx
            //   53                   | push                ebx
            //   e8????????           |                     
            //   53                   | push                ebx

        $sequence_10 = { 4c8bcb 4889442430 488d442440 448d42d3 }
            // n = 4, score = 200
            //   4c8bcb               | repne scasb         al, byte ptr es:[edi]
            //   4889442430           | dec                 ecx
            //   488d442440           | arpl                sp, di
            //   448d42d3             | dec                 eax

        $sequence_11 = { 51 e8???????? 59 8985a8fdffff }
            // n = 4, score = 200
            //   51                   | push                ecx
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8985a8fdffff         | mov                 dword ptr [ebp - 0x258], eax

        $sequence_12 = { 68???????? 57 ff15???????? 8bf0 59 33c0 59 }
            // n = 7, score = 200
            //   68????????           |                     
            //   57                   | push                edi
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   59                   | pop                 ecx
            //   33c0                 | xor                 eax, eax
            //   59                   | pop                 ecx

        $sequence_13 = { 899da0f5ffff c78594f5ffff64000000 e8???????? 53 6a01 8d85d7f5ffff 50 }
            // n = 7, score = 200
            //   899da0f5ffff         | mov                 dword ptr [ebp - 0xa60], ebx
            //   c78594f5ffff64000000     | mov    dword ptr [ebp - 0xa6c], 0x64
            //   e8????????           |                     
            //   53                   | push                ebx
            //   6a01                 | push                1
            //   8d85d7f5ffff         | lea                 eax, [ebp - 0xa29]
            //   50                   | push                eax

        $sequence_14 = { ff15???????? 85c0 7f81 488bcb ff15???????? 488bce }
            // n = 6, score = 200
            //   ff15????????         |                     
            //   85c0                 | imul                edx, edx, 0x11
            //   7f81                 | mov                 eax, edx
            //   488bcb               | dec                 eax
            //   ff15????????         |                     
            //   488bce               | mov                 ebx, dword ptr [esi]

    condition:
        7 of them and filesize < 139264
}