rule win_multigrain_pos_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.multigrain_pos."
        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.multigrain_pos"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { c746140f000000 c7461000000000 c60600 80bd34ffffff00 7504 }
            // n = 5, score = 200
            //   c746140f000000       | mov                 dword ptr [esi + 0x14], 0xf
            //   c7461000000000       | mov                 dword ptr [esi + 0x10], 0
            //   c60600               | mov                 byte ptr [esi], 0
            //   80bd34ffffff00       | cmp                 byte ptr [ebp - 0xcc], 0
            //   7504                 | jne                 6

        $sequence_1 = { 57 e8???????? 83c404 6a00 c746140f000000 }
            // n = 5, score = 200
            //   57                   | push                edi
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   6a00                 | push                0
            //   c746140f000000       | mov                 dword ptr [esi + 0x14], 0xf

        $sequence_2 = { 730d 0fb64c1e01 c1e905 894df4 }
            // n = 4, score = 200
            //   730d                 | jae                 0xf
            //   0fb64c1e01           | movzx               ecx, byte ptr [esi + ebx + 1]
            //   c1e905               | shr                 ecx, 5
            //   894df4               | mov                 dword ptr [ebp - 0xc], ecx

        $sequence_3 = { 6a00 ff15???????? 83bde4fdffff08 720e ffb5d0fdffff }
            // n = 5, score = 200
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   83bde4fdffff08       | cmp                 dword ptr [ebp - 0x21c], 8
            //   720e                 | jb                  0x10
            //   ffb5d0fdffff         | push                dword ptr [ebp - 0x230]

        $sequence_4 = { 6a00 c746140f000000 c7461000000000 c60600 68???????? eb3e ff15???????? }
            // n = 7, score = 200
            //   6a00                 | push                0
            //   c746140f000000       | mov                 dword ptr [esi + 0x14], 0xf
            //   c7461000000000       | mov                 dword ptr [esi + 0x10], 0
            //   c60600               | mov                 byte ptr [esi], 0
            //   68????????           |                     
            //   eb3e                 | jmp                 0x40
            //   ff15????????         |                     

        $sequence_5 = { 3b01 0f823efeffff 8b55f8 5f }
            // n = 4, score = 200
            //   3b01                 | cmp                 eax, dword ptr [ecx]
            //   0f823efeffff         | jb                  0xfffffe44
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   5f                   | pop                 edi

        $sequence_6 = { e8???????? 68???????? 8bd0 8d4dd8 c645fc03 e8???????? }
            // n = 6, score = 200
            //   e8????????           |                     
            //   68????????           |                     
            //   8bd0                 | mov                 edx, eax
            //   8d4dd8               | lea                 ecx, [ebp - 0x28]
            //   c645fc03             | mov                 byte ptr [ebp - 4], 3
            //   e8????????           |                     

        $sequence_7 = { 0f434508 6a01 50 ff15???????? 6a01 }
            // n = 5, score = 200
            //   0f434508             | cmovae              eax, dword ptr [ebp + 8]
            //   6a01                 | push                1
            //   50                   | push                eax
            //   ff15????????         |                     
            //   6a01                 | push                1

        $sequence_8 = { 50 888534ffffff 8d8535ffffff 50 e8???????? 83c40c }
            // n = 6, score = 200
            //   50                   | push                eax
            //   888534ffffff         | mov                 byte ptr [ebp - 0xcc], al
            //   8d8535ffffff         | lea                 eax, [ebp - 0xcb]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_9 = { c784243c04000000000000 c784246804000000000000 c784246c04000000000000 c784247004000000000000 c784247404000000000000 e8???????? 8b3d???????? }
            // n = 7, score = 200
            //   c784243c04000000000000     | mov    dword ptr [esp + 0x43c], 0
            //   c784246804000000000000     | mov    dword ptr [esp + 0x468], 0
            //   c784246c04000000000000     | mov    dword ptr [esp + 0x46c], 0
            //   c784247004000000000000     | mov    dword ptr [esp + 0x470], 0
            //   c784247404000000000000     | mov    dword ptr [esp + 0x474], 0
            //   e8????????           |                     
            //   8b3d????????         |                     

    condition:
        7 of them and filesize < 286720
}