rule win_shimrat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.shimrat."
        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.shimrat"
        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 = { ff15???????? 8bce 899ec0000000 e8???????? 85c0 750e 8d4de8 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   8bce                 | mov                 ecx, esi
            //   899ec0000000         | mov                 dword ptr [esi + 0xc0], ebx
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   750e                 | jne                 0x10
            //   8d4de8               | lea                 ecx, [ebp - 0x18]

        $sequence_1 = { 0fb7c0 53 56 8945fc 0fb7c0 }
            // n = 5, score = 100
            //   0fb7c0               | movzx               eax, ax
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   0fb7c0               | movzx               eax, ax

        $sequence_2 = { 6a04 6a00 8d45a8 50 8d4df0 }
            // n = 5, score = 100
            //   6a04                 | push                4
            //   6a00                 | push                0
            //   8d45a8               | lea                 eax, [ebp - 0x58]
            //   50                   | push                eax
            //   8d4df0               | lea                 ecx, [ebp - 0x10]

        $sequence_3 = { 7506 5d e9???????? 83f804 7506 5d e9???????? }
            // n = 7, score = 100
            //   7506                 | jne                 8
            //   5d                   | pop                 ebp
            //   e9????????           |                     
            //   83f804               | cmp                 eax, 4
            //   7506                 | jne                 8
            //   5d                   | pop                 ebp
            //   e9????????           |                     

        $sequence_4 = { 85c0 0f856dffffff 8d45dc 50 8d4f30 e8???????? 85c0 }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   0f856dffffff         | jne                 0xffffff73
            //   8d45dc               | lea                 eax, [ebp - 0x24]
            //   50                   | push                eax
            //   8d4f30               | lea                 ecx, [edi + 0x30]
            //   e8????????           |                     
            //   85c0                 | test                eax, eax

        $sequence_5 = { e8???????? 6a04 5b 85c0 7427 395dfc }
            // n = 6, score = 100
            //   e8????????           |                     
            //   6a04                 | push                4
            //   5b                   | pop                 ebx
            //   85c0                 | test                eax, eax
            //   7427                 | je                  0x29
            //   395dfc               | cmp                 dword ptr [ebp - 4], ebx

        $sequence_6 = { 83662000 837d1800 7407 8bce e8???????? 33c0 }
            // n = 6, score = 100
            //   83662000             | and                 dword ptr [esi + 0x20], 0
            //   837d1800             | cmp                 dword ptr [ebp + 0x18], 0
            //   7407                 | je                  9
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   33c0                 | xor                 eax, eax

        $sequence_7 = { c705????????02000000 c705????????03000000 8935???????? 8935???????? 8935???????? 8935???????? e8???????? }
            // n = 7, score = 100
            //   c705????????02000000     |     
            //   c705????????03000000     |     
            //   8935????????         |                     
            //   8935????????         |                     
            //   8935????????         |                     
            //   8935????????         |                     
            //   e8????????           |                     

        $sequence_8 = { 50 6a08 8d45f4 50 8d4d08 }
            // n = 5, score = 100
            //   50                   | push                eax
            //   6a08                 | push                8
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   50                   | push                eax
            //   8d4d08               | lea                 ecx, [ebp + 8]

        $sequence_9 = { 8d4d30 e8???????? 56 8d85b0e7ffff 50 8d4d30 e8???????? }
            // n = 7, score = 100
            //   8d4d30               | lea                 ecx, [ebp + 0x30]
            //   e8????????           |                     
            //   56                   | push                esi
            //   8d85b0e7ffff         | lea                 eax, [ebp - 0x1850]
            //   50                   | push                eax
            //   8d4d30               | lea                 ecx, [ebp + 0x30]
            //   e8????????           |                     

    condition:
        7 of them and filesize < 65536
}