rule win_torisma_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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???????? 3d83490000 7507 b883490000 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   3d83490000           | cmp                 eax, 0x4983
            //   7507                 | jne                 9
            //   b883490000           | mov                 eax, 0x4983

        $sequence_2 = { e8???????? 3d514b0000 7504 33c0 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   3d514b0000           | cmp                 eax, 0x4b51
            //   7504                 | jne                 6
            //   33c0                 | xor                 eax, eax

        $sequence_3 = { 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_4 = { 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_5 = { 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_6 = { 4881ec98000000 48c7442460feffffff b914000000 e8???????? 4889442438 48837c243800 }
            // n = 6, score = 100
            //   4881ec98000000       | mov                 dword ptr [esp + 0xac], ecx
            //   48c7442460feffffff     | dec    eax
            //   b914000000           | mov                 edx, dword ptr [esp + 0x78]
            //   e8????????           |                     
            //   4889442438           | mov                 edx, dword ptr [edx + 0x10]
            //   48837c243800         | dec                 eax

        $sequence_7 = { c644245137 c644245282 c644245367 c644245432 }
            // n = 4, score = 100
            //   c644245137           | mov                 edi, dword ptr [esp + 0x70]
            //   c644245282           | mov                 edx, dword ptr [edi + edx*4]
            //   c644245367           | dec                 eax
            //   c644245432           | sub                 esp, 0x98

        $sequence_8 = { 48c744244800000000 488b4c2438 e8???????? 488b442438 4889842480000000 }
            // n = 5, score = 100
            //   48c744244800000000     | dec    eax
            //   488b4c2438           | mov                 dword ptr [esp + 0x48], 0
            //   e8????????           |                     
            //   488b442438           | dec                 eax
            //   4889842480000000     | mov                 ecx, dword ptr [esp + 0x38]

        $sequence_9 = { 39442424 7202 eb2a 48837c245800 7413 }
            // n = 5, score = 100
            //   39442424             | dec                 eax
            //   7202                 | mov                 eax, dword ptr [esp + 0x38]
            //   eb2a                 | dec                 eax
            //   48837c245800         | mov                 dword ptr [esp + 0x80], eax
            //   7413                 | cmp                 dword ptr [esp + 0x24], eax

        $sequence_10 = { 0bd1 8bca 898c24ac000000 488b542478 8b5210 488b7c2470 8b1497 }
            // n = 7, score = 100
            //   0bd1                 | jb                  8
            //   8bca                 | jmp                 0x2c
            //   898c24ac000000       | dec                 eax
            //   488b542478           | cmp                 dword ptr [esp + 0x58], 0
            //   8b5210               | je                  0x1d
            //   488b7c2470           | or                  edx, ecx
            //   8b1497               | mov                 ecx, edx

        $sequence_11 = { 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

        $sequence_12 = { 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

    condition:
        7 of them and filesize < 322560
}