rule win_simda_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        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 = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { 57 e8???????? 8b7510 57 e8???????? }
            // n = 5, score = 700
            //   57                   | push                edi
            //   e8????????           |                     
            //   8b7510               | mov                 esi, dword ptr [ebp + 0x10]
            //   57                   | push                edi
            //   e8????????           |                     

        $sequence_1 = { 3bce 8945f4 1bc0 40 57 895dfc }
            // n = 6, score = 700
            //   3bce                 | cmp                 ecx, esi
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   1bc0                 | sbb                 eax, eax
            //   40                   | inc                 eax
            //   57                   | push                edi
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx

        $sequence_2 = { 85db 7412 03c3 3bc3 7305 }
            // n = 5, score = 700
            //   85db                 | test                ebx, ebx
            //   7412                 | je                  0x14
            //   03c3                 | add                 eax, ebx
            //   3bc3                 | cmp                 eax, ebx
            //   7305                 | jae                 7

        $sequence_3 = { 6804010000 68???????? 8d85f8feffff 50 ffd6 6804010000 68???????? }
            // n = 7, score = 700
            //   6804010000           | push                0x104
            //   68????????           |                     
            //   8d85f8feffff         | lea                 eax, [ebp - 0x108]
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   6804010000           | push                0x104
            //   68????????           |                     

        $sequence_4 = { ff15???????? 85c0 740d f6450802 7507 56 }
            // n = 6, score = 700
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   740d                 | je                  0xf
            //   f6450802             | test                byte ptr [ebp + 8], 2
            //   7507                 | jne                 9
            //   56                   | push                esi

        $sequence_5 = { 6803010000 33c9 8d95edfdffff 56 52 }
            // n = 5, score = 700
            //   6803010000           | push                0x103
            //   33c9                 | xor                 ecx, ecx
            //   8d95edfdffff         | lea                 edx, [ebp - 0x213]
            //   56                   | push                esi
            //   52                   | push                edx

        $sequence_6 = { 7305 ba01000000 c745fc00000000 8b5d08 8934bb 8b7510 8945d8 }
            // n = 7, score = 700
            //   7305                 | jae                 7
            //   ba01000000           | mov                 edx, 1
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]
            //   8934bb               | mov                 dword ptr [ebx + edi*4], esi
            //   8b7510               | mov                 esi, dword ptr [ebp + 0x10]
            //   8945d8               | mov                 dword ptr [ebp - 0x28], eax

        $sequence_7 = { ffd7 83c408 85c0 74e4 6a0a 6a00 }
            // n = 6, score = 700
            //   ffd7                 | call                edi
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   74e4                 | je                  0xffffffe6
            //   6a0a                 | push                0xa
            //   6a00                 | push                0

        $sequence_8 = { c1eb10 3bce 7601 4b c1ef10 2bdf 5f }
            // n = 7, score = 700
            //   c1eb10               | shr                 ebx, 0x10
            //   3bce                 | cmp                 ecx, esi
            //   7601                 | jbe                 3
            //   4b                   | dec                 ebx
            //   c1ef10               | shr                 edi, 0x10
            //   2bdf                 | sub                 ebx, edi
            //   5f                   | pop                 edi

        $sequence_9 = { a1???????? 8dbc35c8fcffff 03d7 81e201000080 7905 }
            // n = 5, score = 700
            //   a1????????           |                     
            //   8dbc35c8fcffff       | lea                 edi, [ebp + esi - 0x338]
            //   03d7                 | add                 edx, edi
            //   81e201000080         | and                 edx, 0x80000001
            //   7905                 | jns                 7

    condition:
        7 of them and filesize < 1581056
}