rule win_sanny_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.sanny."
        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.sanny"
        malpedia_rule_date = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 66a1???????? 8d4c2414 68???????? 51 c744241800000000 89542424 6689442428 }
            // n = 7, score = 100
            //   66a1????????         |                     
            //   8d4c2414             | lea                 ecx, [esp + 0x14]
            //   68????????           |                     
            //   51                   | push                ecx
            //   c744241800000000     | mov                 dword ptr [esp + 0x18], 0
            //   89542424             | mov                 dword ptr [esp + 0x24], edx
            //   6689442428           | mov                 word ptr [esp + 0x28], ax

        $sequence_1 = { 50 ff15???????? 85c0 898614c50000 0f84ed000000 6a00 8dbe08c50000 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   898614c50000         | mov                 dword ptr [esi + 0xc514], eax
            //   0f84ed000000         | je                  0xf3
            //   6a00                 | push                0
            //   8dbe08c50000         | lea                 edi, [esi + 0xc508]

        $sequence_2 = { 889424c8010000 f3ab 66ab aa b907000000 33c0 8dbc24e9010000 }
            // n = 7, score = 100
            //   889424c8010000       | mov                 byte ptr [esp + 0x1c8], dl
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   aa                   | stosb               byte ptr es:[edi], al
            //   b907000000           | mov                 ecx, 7
            //   33c0                 | xor                 eax, eax
            //   8dbc24e9010000       | lea                 edi, [esp + 0x1e9]

        $sequence_3 = { 0f8503010000 6689842418040000 668984241a040000 8a44241c 3c01 }
            // n = 5, score = 100
            //   0f8503010000         | jne                 0x109
            //   6689842418040000     | mov                 word ptr [esp + 0x418], ax
            //   668984241a040000     | mov                 word ptr [esp + 0x41a], ax
            //   8a44241c             | mov                 al, byte ptr [esp + 0x1c]
            //   3c01                 | cmp                 al, 1

        $sequence_4 = { 5e 8d0c8d28634100 3bc1 7305 395004 7402 33c0 }
            // n = 7, score = 100
            //   5e                   | pop                 esi
            //   8d0c8d28634100       | lea                 ecx, [ecx*4 + 0x416328]
            //   3bc1                 | cmp                 eax, ecx
            //   7305                 | jae                 7
            //   395004               | cmp                 dword ptr [eax + 4], edx
            //   7402                 | je                  4
            //   33c0                 | xor                 eax, eax

        $sequence_5 = { 8bd0 48 83fa01 898424b4000000 7504 8ac2 eb02 }
            // n = 7, score = 100
            //   8bd0                 | mov                 edx, eax
            //   48                   | dec                 eax
            //   83fa01               | cmp                 edx, 1
            //   898424b4000000       | mov                 dword ptr [esp + 0xb4], eax
            //   7504                 | jne                 6
            //   8ac2                 | mov                 al, dl
            //   eb02                 | jmp                 4

        $sequence_6 = { 57 8bce e8???????? 85c0 7513 8b442410 8bce }
            // n = 7, score = 100
            //   57                   | push                edi
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7513                 | jne                 0x15
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]
            //   8bce                 | mov                 ecx, esi

        $sequence_7 = { 03c3 8d9c0844eabea4 8b442414 c1c304 03de 8bcb 33ce }
            // n = 7, score = 100
            //   03c3                 | add                 eax, ebx
            //   8d9c0844eabea4       | lea                 ebx, [eax + ecx - 0x5b4115bc]
            //   8b442414             | mov                 eax, dword ptr [esp + 0x14]
            //   c1c304               | rol                 ebx, 4
            //   03de                 | add                 ebx, esi
            //   8bcb                 | mov                 ecx, ebx
            //   33ce                 | xor                 ecx, esi

        $sequence_8 = { f2ae f7d1 2bf9 8d9424a0020000 }
            // n = 4, score = 100
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   2bf9                 | sub                 edi, ecx
            //   8d9424a0020000       | lea                 edx, [esp + 0x2a0]

        $sequence_9 = { 50 8d8c2424010000 e8???????? 8d8c24900a0000 51 e8???????? 56 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   8d8c2424010000       | lea                 ecx, [esp + 0x124]
            //   e8????????           |                     
            //   8d8c24900a0000       | lea                 ecx, [esp + 0xa90]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   56                   | push                esi

    condition:
        7 of them and filesize < 253952
}