rule win_winsloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.winsloader"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 895dfc 3bc3 741a 33c9 8d9b00000000 }
            // n = 5, score = 200
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   3bc3                 | cmp                 eax, ebx
            //   741a                 | je                  0x1c
            //   33c9                 | xor                 ecx, ecx
            //   8d9b00000000         | lea                 ebx, [ebx]

        $sequence_1 = { 8d8375050000 6a00 a3???????? ff15???????? }
            // n = 4, score = 200
            //   8d8375050000         | lea                 eax, [ebx + 0x575]
            //   6a00                 | push                0
            //   a3????????           |                     
            //   ff15????????         |                     

        $sequence_2 = { 83c40c 6800040000 8d8dfcf7ffff 51 }
            // n = 4, score = 200
            //   83c40c               | add                 esp, 0xc
            //   6800040000           | push                0x400
            //   8d8dfcf7ffff         | lea                 ecx, [ebp - 0x804]
            //   51                   | push                ecx

        $sequence_3 = { f3a5 83c40c a4 ffd0 5b }
            // n = 5, score = 200
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   83c40c               | add                 esp, 0xc
            //   a4                   | movsb               byte ptr es:[edi], byte ptr [esi]
            //   ffd0                 | call                eax
            //   5b                   | pop                 ebx

        $sequence_4 = { 8d45d8 50 53 56 57 c745d800000000 }
            // n = 6, score = 200
            //   8d45d8               | lea                 eax, [ebp - 0x28]
            //   50                   | push                eax
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   c745d800000000       | mov                 dword ptr [ebp - 0x28], 0

        $sequence_5 = { 8a10 40 84d2 75f9 2bc1 0fb6f8 888435fefbffff }
            // n = 7, score = 200
            //   8a10                 | mov                 dl, byte ptr [eax]
            //   40                   | inc                 eax
            //   84d2                 | test                dl, dl
            //   75f9                 | jne                 0xfffffffb
            //   2bc1                 | sub                 eax, ecx
            //   0fb6f8               | movzx               edi, al
            //   888435fefbffff       | mov                 byte ptr [ebp + esi - 0x402], al

        $sequence_6 = { e8???????? 6820800000 e8???????? 83c410 8945dc }
            // n = 5, score = 200
            //   e8????????           |                     
            //   6820800000           | push                0x8020
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   8945dc               | mov                 dword ptr [ebp - 0x24], eax

        $sequence_7 = { 53 8d95fcfbffff 52 0590120000 b920010000 be???????? }
            // n = 6, score = 200
            //   53                   | push                ebx
            //   8d95fcfbffff         | lea                 edx, [ebp - 0x404]
            //   52                   | push                edx
            //   0590120000           | add                 eax, 0x1290
            //   b920010000           | mov                 ecx, 0x120
            //   be????????           |                     

        $sequence_8 = { 8945fc 68ff030000 8d85fdf7ffff 6a00 }
            // n = 4, score = 200
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   68ff030000           | push                0x3ff
            //   8d85fdf7ffff         | lea                 eax, [ebp - 0x803]
            //   6a00                 | push                0

        $sequence_9 = { c745cc231a0110 a1???????? 8d4dc8 33c1 8945d0 8b4518 }
            // n = 6, score = 100
            //   c745cc231a0110       | mov                 dword ptr [ebp - 0x34], 0x10011a23
            //   a1????????           |                     
            //   8d4dc8               | lea                 ecx, [ebp - 0x38]
            //   33c1                 | xor                 eax, ecx
            //   8945d0               | mov                 dword ptr [ebp - 0x30], eax
            //   8b4518               | mov                 eax, dword ptr [ebp + 0x18]

        $sequence_10 = { 51 8d45e0 0f57c0 50 0f1145e0 e8???????? }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   8d45e0               | lea                 eax, [ebp - 0x20]
            //   0f57c0               | xorps               xmm0, xmm0
            //   50                   | push                eax
            //   0f1145e0             | movups              xmmword ptr [ebp - 0x20], xmm0
            //   e8????????           |                     

        $sequence_11 = { 8945f0 8b450c 8945f4 8b4514 40 c745ec60190110 894df8 }
            // n = 7, score = 100
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   8b4514               | mov                 eax, dword ptr [ebp + 0x14]
            //   40                   | inc                 eax
            //   c745ec60190110       | mov                 dword ptr [ebp - 0x14], 0x10011960
            //   894df8               | mov                 dword ptr [ebp - 8], ecx

        $sequence_12 = { 8b85f8f3ffff 50 8d8dfcfbffff 51 8b95e4f3ffff 0395ecf3ffff }
            // n = 6, score = 100
            //   8b85f8f3ffff         | mov                 eax, dword ptr [ebp - 0xc08]
            //   50                   | push                eax
            //   8d8dfcfbffff         | lea                 ecx, [ebp - 0x404]
            //   51                   | push                ecx
            //   8b95e4f3ffff         | mov                 edx, dword ptr [ebp - 0xc1c]
            //   0395ecf3ffff         | add                 edx, dword ptr [ebp - 0xc14]

        $sequence_13 = { 668b9560f3ffff 668995f0f3ffff 8b85f8f3ffff 668b8df0f3ffff 66898c05fcfbffff 8b95f8f3ffff }
            // n = 6, score = 100
            //   668b9560f3ffff       | mov                 dx, word ptr [ebp - 0xca0]
            //   668995f0f3ffff       | mov                 word ptr [ebp - 0xc10], dx
            //   8b85f8f3ffff         | mov                 eax, dword ptr [ebp - 0xc08]
            //   668b8df0f3ffff       | mov                 cx, word ptr [ebp - 0xc10]
            //   66898c05fcfbffff     | mov                 word ptr [ebp + eax - 0x404], cx
            //   8b95f8f3ffff         | mov                 edx, dword ptr [ebp - 0xc08]

        $sequence_14 = { 53 57 894c2424 e8???????? 83c408 }
            // n = 5, score = 100
            //   53                   | push                ebx
            //   57                   | push                edi
            //   894c2424             | mov                 dword ptr [esp + 0x24], ecx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8

        $sequence_15 = { 6a00 50 e8???????? 8945cc 8d45cc }
            // n = 5, score = 100
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     
            //   8945cc               | mov                 dword ptr [ebp - 0x34], eax
            //   8d45cc               | lea                 eax, [ebp - 0x34]

    condition:
        7 of them and filesize < 270336
}