rule win_simda_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.simda."
        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.simda"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 40 3b4604 72f1 894e04 }
            // n = 4, score = 700
            //   40                   | inc                 eax
            //   3b4604               | cmp                 eax, dword ptr [esi + 4]
            //   72f1                 | jb                  0xfffffff3
            //   894e04               | mov                 dword ptr [esi + 4], ecx

        $sequence_1 = { 6803010000 8d85b1feffff 6a00 50 a4 c685b0feffff00 }
            // n = 6, score = 700
            //   6803010000           | push                0x103
            //   8d85b1feffff         | lea                 eax, [ebp - 0x14f]
            //   6a00                 | push                0
            //   50                   | push                eax
            //   a4                   | movsb               byte ptr es:[edi], byte ptr [esi]
            //   c685b0feffff00       | mov                 byte ptr [ebp - 0x150], 0

        $sequence_2 = { 83cbff 2bdf f7d9 391e 7601 }
            // n = 5, score = 700
            //   83cbff               | or                  ebx, 0xffffffff
            //   2bdf                 | sub                 ebx, edi
            //   f7d9                 | neg                 ecx
            //   391e                 | cmp                 dword ptr [esi], ebx
            //   7601                 | jbe                 3

        $sequence_3 = { 75f4 53 8b1d???????? 56 57 }
            // n = 5, score = 700
            //   75f4                 | jne                 0xfffffff6
            //   53                   | push                ebx
            //   8b1d????????         |                     
            //   56                   | push                esi
            //   57                   | push                edi

        $sequence_4 = { 0faff3 03f2 8bf9 8bd6 8d0436 8b75d8 03c9 }
            // n = 7, score = 700
            //   0faff3               | imul                esi, ebx
            //   03f2                 | add                 esi, edx
            //   8bf9                 | mov                 edi, ecx
            //   8bd6                 | mov                 edx, esi
            //   8d0436               | lea                 eax, [esi + esi]
            //   8b75d8               | mov                 esi, dword ptr [ebp - 0x28]
            //   03c9                 | add                 ecx, ecx

        $sequence_5 = { 8b0d???????? 8945d4 a1???????? 8955dc 0fb615???????? }
            // n = 5, score = 700
            //   8b0d????????         |                     
            //   8945d4               | mov                 dword ptr [ebp - 0x2c], eax
            //   a1????????           |                     
            //   8955dc               | mov                 dword ptr [ebp - 0x24], edx
            //   0fb615????????       |                     

        $sequence_6 = { c1eb10 3bce 7601 4b c1ef10 }
            // n = 5, score = 700
            //   c1eb10               | shr                 ebx, 0x10
            //   3bce                 | cmp                 ecx, esi
            //   7601                 | jbe                 3
            //   4b                   | dec                 ebx
            //   c1ef10               | shr                 edi, 0x10

        $sequence_7 = { 83f920 72e0 eb0b 41 eb08 83c102 }
            // n = 6, score = 700
            //   83f920               | cmp                 ecx, 0x20
            //   72e0                 | jb                  0xffffffe2
            //   eb0b                 | jmp                 0xd
            //   41                   | inc                 ecx
            //   eb08                 | jmp                 0xa
            //   83c102               | add                 ecx, 2

        $sequence_8 = { 8bd1 c1ea10 8955ec 8bf8 }
            // n = 4, score = 700
            //   8bd1                 | mov                 edx, ecx
            //   c1ea10               | shr                 edx, 0x10
            //   8955ec               | mov                 dword ptr [ebp - 0x14], edx
            //   8bf8                 | mov                 edi, eax

        $sequence_9 = { 6a00 56 c60000 ffd3 83c40c 8945ec 85c0 }
            // n = 7, score = 700
            //   6a00                 | push                0
            //   56                   | push                esi
            //   c60000               | mov                 byte ptr [eax], 0
            //   ffd3                 | call                ebx
            //   83c40c               | add                 esp, 0xc
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   85c0                 | test                eax, eax

    condition:
        7 of them and filesize < 1581056
}