rule win_torisma_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.torisma."
        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.torisma"
        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 = { 7402 eb05 e9???????? b833280000 }
            // n = 4, score = 200
            //   7402                 | je                  4
            //   eb05                 | jmp                 7
            //   e9????????           |                     
            //   b833280000           | mov                 eax, 0x2833

        $sequence_1 = { e8???????? 3d514b0000 7504 33c0 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   3d514b0000           | cmp                 eax, 0x4b51
            //   7504                 | jne                 6
            //   33c0                 | xor                 eax, eax

        $sequence_2 = { e8???????? 3d83490000 7507 b883490000 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   3d83490000           | cmp                 eax, 0x4983
            //   7507                 | jne                 9
            //   b883490000           | mov                 eax, 0x4983

        $sequence_3 = { 83e101 33c1 488b4c2450 8b495c c1e902 }
            // n = 5, score = 100
            //   83e101               | mov                 eax, dword ptr [ebx + 0x110]
            //   33c1                 | dec                 eax
            //   488b4c2450           | test                eax, eax
            //   8b495c               | dec                 eax
            //   c1e902               | mov                 dword ptr [esp + 0x48], eax

        $sequence_4 = { 4889442448 488b8c2480000000 488b39 33c0 488b4c2448 }
            // n = 5, score = 100
            //   4889442448           | lea                 ecx, [0x12137]
            //   488b8c2480000000     | dec                 eax
            //   488b39               | cmp                 eax, ecx
            //   33c0                 | je                  0x7b
            //   488b4c2448           | dec                 eax

        $sequence_5 = { 8d4310 8d89f4cd0110 5a 668b31 668930 }
            // n = 5, score = 100
            //   8d4310               | lea                 eax, [ebx + 0x10]
            //   8d89f4cd0110         | lea                 ecx, [ecx + 0x1001cdf4]
            //   5a                   | pop                 edx
            //   668b31               | mov                 si, word ptr [ecx]
            //   668930               | mov                 word ptr [eax], si

        $sequence_6 = { 334dfc 894dfc 8b4d08 8b5164 }
            // n = 4, score = 100
            //   334dfc               | xor                 ecx, dword ptr [ebp - 4]
            //   894dfc               | mov                 dword ptr [ebp - 4], ecx
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8b5164               | mov                 edx, dword ptr [ecx + 0x64]

        $sequence_7 = { b862000000 668945f6 33c9 66894df8 8d55b0 52 }
            // n = 6, score = 100
            //   b862000000           | mov                 eax, 0x62
            //   668945f6             | mov                 word ptr [ebp - 0xa], ax
            //   33c9                 | xor                 ecx, ecx
            //   66894df8             | mov                 word ptr [ebp - 8], cx
            //   8d55b0               | lea                 edx, [ebp - 0x50]
            //   52                   | push                edx

        $sequence_8 = { 0f8554010000 0fb644243c 25fc000000 c1f802 }
            // n = 4, score = 100
            //   0f8554010000         | jne                 0x15a
            //   0fb644243c           | movzx               eax, byte ptr [esp + 0x3c]
            //   25fc000000           | and                 eax, 0xfc
            //   c1f802               | sar                 eax, 2

        $sequence_9 = { 740d 8b4dd8 e8???????? 8945c0 }
            // n = 4, score = 100
            //   740d                 | je                  0xf
            //   8b4dd8               | mov                 ecx, dword ptr [ebp - 0x28]
            //   e8????????           |                     
            //   8945c0               | mov                 dword ptr [ebp - 0x40], eax

        $sequence_10 = { 0f8343040000 488b0424 8b00 486bc014 488d0dde210100 }
            // n = 5, score = 100
            //   0f8343040000         | jae                 0x449
            //   488b0424             | dec                 eax
            //   8b00                 | mov                 eax, dword ptr [esp]
            //   486bc014             | mov                 eax, dword ptr [eax]
            //   488d0dde210100       | dec                 eax

        $sequence_11 = { 4885c0 7479 488d0d37210100 483bc1 746d 488b8310010000 4885c0 }
            // n = 7, score = 100
            //   4885c0               | imul                eax, eax, 0x14
            //   7479                 | dec                 eax
            //   488d0d37210100       | lea                 ecx, [0x121de]
            //   483bc1               | dec                 eax
            //   746d                 | test                eax, eax
            //   488b8310010000       | je                  0x7b
            //   4885c0               | dec                 eax

        $sequence_12 = { 6a03 8b55f8 8b4204 50 }
            // n = 4, score = 100
            //   6a03                 | push                3
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   8b4204               | mov                 eax, dword ptr [edx + 4]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 322560
}