rule win_simda_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 0faf5dfc 8bfa c1e710 0b7df4 3bdf }
            // n = 5, score = 700
            //   0faf5dfc             | imul                ebx, dword ptr [ebp - 4]
            //   8bfa                 | mov                 edi, edx
            //   c1e710               | shl                 edi, 0x10
            //   0b7df4               | or                  edi, dword ptr [ebp - 0xc]
            //   3bdf                 | cmp                 ebx, edi

        $sequence_1 = { 8b5508 83c40c 803a00 0f8491000000 53 8bda }
            // n = 6, score = 700
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   83c40c               | add                 esp, 0xc
            //   803a00               | cmp                 byte ptr [edx], 0
            //   0f8491000000         | je                  0x97
            //   53                   | push                ebx
            //   8bda                 | mov                 ebx, edx

        $sequence_2 = { 33d2 3b7dec 7519 8b5dfc }
            // n = 4, score = 700
            //   33d2                 | xor                 edx, edx
            //   3b7dec               | cmp                 edi, dword ptr [ebp - 0x14]
            //   7519                 | jne                 0x1b
            //   8b5dfc               | mov                 ebx, dword ptr [ebp - 4]

        $sequence_3 = { 0fb7c8 0fafd1 8bf9 c1e810 0faffb }
            // n = 5, score = 700
            //   0fb7c8               | movzx               ecx, ax
            //   0fafd1               | imul                edx, ecx
            //   8bf9                 | mov                 edi, ecx
            //   c1e810               | shr                 eax, 0x10
            //   0faffb               | imul                edi, ebx

        $sequence_4 = { 8d95f5fdffff 33c9 53 52 }
            // n = 4, score = 700
            //   8d95f5fdffff         | lea                 edx, [ebp - 0x20b]
            //   33c9                 | xor                 ecx, ecx
            //   53                   | push                ebx
            //   52                   | push                edx

        $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 = { 03c7 3bc7 7301 42 }
            // n = 4, score = 700
            //   03c7                 | add                 eax, edi
            //   3bc7                 | cmp                 eax, edi
            //   7301                 | jae                 3
            //   42                   | inc                 edx

        $sequence_7 = { 7c02 33c0 41 81f900010000 7ce4 }
            // n = 5, score = 700
            //   7c02                 | jl                  4
            //   33c0                 | xor                 eax, eax
            //   41                   | inc                 ecx
            //   81f900010000         | cmp                 ecx, 0x100
            //   7ce4                 | jl                  0xffffffe6

        $sequence_8 = { ffd7 8b1d???????? 6a00 6a01 8d8df8feffff }
            // n = 5, score = 700
            //   ffd7                 | call                edi
            //   8b1d????????         |                     
            //   6a00                 | push                0
            //   6a01                 | push                1
            //   8d8df8feffff         | lea                 ecx, [ebp - 0x108]

        $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
}