rule win_tenzor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.tenzor."
        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.tenzor"
        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 = { 4883f807 75c9 c7442408a7a38584 c644240cd0 31c0 49b9e3a267458211cc70 440fb6540408 }
            // n = 7, score = 100
            //   4883f807             | inc                 ecx
            //   75c9                 | movzx               eax, byte ptr [edi]
            //   c7442408a7a38584     | dec                 eax
            //   c644240cd0           | mov                 ecx, 0x7bd86507
            //   31c0                 | cld                 
            //   49b9e3a267458211cc70     | cdq    
            //   440fb6540408         | pop                 edi

        $sequence_1 = { 48896550 b810000000 e8???????? 4829c4 4989e0 488d05004d0200 4c894558 }
            // n = 7, score = 100
            //   48896550             | sub                 esp, eax
            //   b810000000           | dec                 eax
            //   e8????????           |                     
            //   4829c4               | mov                 dword ptr [ebp + 0x468], esp
            //   4989e0               | mov                 eax, 0x10
            //   488d05004d0200       | dec                 eax
            //   4c894558             | mov                 dword ptr [edx], eax

        $sequence_2 = { 49833800 7459 4881c488000000 c3 c7442440641d1edf 31c0 48b921cd13fec6ece840 }
            // n = 7, score = 100
            //   49833800             | and                 eax, ecx
            //   7459                 | dec                 eax
            //   4881c488000000       | mov                 ecx, eax
            //   c3                   | dec                 esp
            //   c7442440641d1edf     | sub                 ecx, eax
            //   31c0                 | dec                 ecx
            //   48b921cd13fec6ece840     | mov    eax, 0xb5137b3c

        $sequence_3 = { 4889c3 c60000 48895c2430 4889742438 498b4618 4d8b4e10 498b0e }
            // n = 7, score = 100
            //   4889c3               | add                 cl, 0xdc
            //   c60000               | mov                 byte ptr [esp + eax + 0xdc], cl
            //   48895c2430           | dec                 eax
            //   4889742438           | add                 eax, 1
            //   498b4618             | jmp                 0x19
            //   4d8b4e10             | dec                 eax
            //   498b0e               | lea                 edx, [esp + 0xdc]

        $sequence_4 = { 7270 49c1e803 49ffc0 4d89c2 4983e2fc 4a8d0cd6 }
            // n = 6, score = 100
            //   7270                 | dec                 ecx
            //   49c1e803             | mov                 ecx, edx
            //   49ffc0               | dec                 ecx
            //   4d89c2               | xor                 ecx, ebx
            //   4983e2fc             | inc                 ecx
            //   4a8d0cd6             | mov                 edx, edx

        $sequence_5 = { c685a602000009 c685a702000031 c685a802000000 c685a902000033 c685aa02000058 c685ab02000035 c685ac02000058 }
            // n = 7, score = 100
            //   c685a602000009       | mov                 byte ptr [ebp + 0x245], 0xd
            //   c685a702000031       | mov                 byte ptr [ebp + 0x246], 0x20
            //   c685a802000000       | mov                 byte ptr [ebp + 0x247], 0xf
            //   c685a902000033       | mov                 byte ptr [ebp + 0x248], 0xe3
            //   c685aa02000058       | mov                 byte ptr [ebp + 0x243], 0xb
            //   c685ab02000035       | mov                 byte ptr [ebp + 0x244], 0xff
            //   c685ac02000058       | mov                 byte ptr [ebp + 0x245], 0xd

        $sequence_6 = { 488d9424f0000000 4889542428 48c744242000000000 4889da 4d89f0 41b930000000 ff90a0000000 }
            // n = 7, score = 100
            //   488d9424f0000000     | jne                 0x263
            //   4889542428           | mov                 edx, eax
            //   48c744242000000000     | and    edx, 3
            //   4889da               | dec                 eax
            //   4d89f0               | mov                 ecx, eax
            //   41b930000000         | dec                 eax
            //   ff90a0000000         | or                  ecx, 3

        $sequence_7 = { 6685d2 410f95c0 4f8d1441 66895304 470fb70441 31d2 }
            // n = 6, score = 100
            //   6685d2               | mov                 ebx, dword ptr [esp + 0xb0]
            //   410f95c0             | dec                 ebp
            //   4f8d1441             | test                eax, eax
            //   66895304             | je                  0x1400
            //   470fb70441           | push                ebx
            //   31d2                 | dec                 eax

        $sequence_8 = { 4080c615 428874140d 49ffc2 4983fa03 75d5 c7442410e2ccc8ce 66c7442414cec5 }
            // n = 7, score = 100
            //   4080c615             | dec                 eax
            //   428874140d           | xor                 eax, 0xb
            //   49ffc2               | xor                 al, 0xe4
            //   4983fa03             | mov                 byte ptr [ebp + 0x603], al
            //   75d5                 | xor                 al, 0xe4
            //   c7442410e2ccc8ce     | mov                 byte ptr [ebp + 0x603], al
            //   66c7442414cec5       | movzx               eax, byte ptr [ebp + 0x65c]

        $sequence_9 = { 4d31f8 4909c8 89c3 81f385000000 21cb 4c31c3 48895c2408 }
            // n = 7, score = 100
            //   4d31f8               | dec                 ecx
            //   4909c8               | mov                 eax, edx
            //   89c3                 | dec                 ebp
            //   81f385000000         | sub                 eax, edx
            //   21cb                 | dec                 ebp
            //   4c31c3               | and                 eax, ecx
            //   48895c2408           | dec                 esp

    condition:
        7 of them and filesize < 548864
}