rule win_mrac_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.mrac."
        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.mrac"
        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 = { 3473 8d8c2448030000 6a05 88842454030000 e8???????? 3474 8d8c2448030000 }
            // n = 7, score = 200
            //   3473                 | xor                 al, 0x73
            //   8d8c2448030000       | lea                 ecx, [esp + 0x348]
            //   6a05                 | push                5
            //   88842454030000       | mov                 byte ptr [esp + 0x354], al
            //   e8????????           |                     
            //   3474                 | xor                 al, 0x74
            //   8d8c2448030000       | lea                 ecx, [esp + 0x348]

        $sequence_1 = { e8???????? 0473 8d8c2438010000 6a30 88842440010000 e8???????? }
            // n = 6, score = 200
            //   e8????????           |                     
            //   0473                 | add                 al, 0x73
            //   8d8c2438010000       | lea                 ecx, [esp + 0x138]
            //   6a30                 | push                0x30
            //   88842440010000       | mov                 byte ptr [esp + 0x140], al
            //   e8????????           |                     

        $sequence_2 = { 64a300000000 6a02 68???????? e8???????? 68???????? c745fc00000000 }
            // n = 6, score = 200
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   6a02                 | push                2
            //   68????????           |                     
            //   e8????????           |                     
            //   68????????           |                     
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0

        $sequence_3 = { e8???????? 346e 8d8c24d8150000 6a01 888424e0150000 e8???????? 3465 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   346e                 | xor                 al, 0x6e
            //   8d8c24d8150000       | lea                 ecx, [esp + 0x15d8]
            //   6a01                 | push                1
            //   888424e0150000       | mov                 byte ptr [esp + 0x15e0], al
            //   e8????????           |                     
            //   3465                 | xor                 al, 0x65

        $sequence_4 = { e8???????? 0474 8d4c2410 6a04 88442416 e8???????? }
            // n = 6, score = 200
            //   e8????????           |                     
            //   0474                 | add                 al, 0x74
            //   8d4c2410             | lea                 ecx, [esp + 0x10]
            //   6a04                 | push                4
            //   88442416             | mov                 byte ptr [esp + 0x16], al
            //   e8????????           |                     

        $sequence_5 = { 343d 8885e1fbffff 8b85a8fbffff 0436 3475 8885e2fbffff 8b85a8fbffff }
            // n = 7, score = 200
            //   343d                 | xor                 al, 0x3d
            //   8885e1fbffff         | mov                 byte ptr [ebp - 0x41f], al
            //   8b85a8fbffff         | mov                 eax, dword ptr [ebp - 0x458]
            //   0436                 | add                 al, 0x36
            //   3475                 | xor                 al, 0x75
            //   8885e2fbffff         | mov                 byte ptr [ebp - 0x41e], al
            //   8b85a8fbffff         | mov                 eax, dword ptr [ebp - 0x458]

        $sequence_6 = { c68424531300005d c68424541300000d c68424551300007b c684245613000048 c684245713000048 c68424581300004c c684245913000040 }
            // n = 7, score = 200
            //   c68424531300005d     | mov                 byte ptr [esp + 0x1353], 0x5d
            //   c68424541300000d     | mov                 byte ptr [esp + 0x1354], 0xd
            //   c68424551300007b     | mov                 byte ptr [esp + 0x1355], 0x7b
            //   c684245613000048     | mov                 byte ptr [esp + 0x1356], 0x48
            //   c684245713000048     | mov                 byte ptr [esp + 0x1357], 0x48
            //   c68424581300004c     | mov                 byte ptr [esp + 0x1358], 0x4c
            //   c684245913000040     | mov                 byte ptr [esp + 0x1359], 0x40

        $sequence_7 = { 8d8c2480010000 6a66 88842491010000 e8???????? 0472 8d8c2480010000 6a66 }
            // n = 7, score = 200
            //   8d8c2480010000       | lea                 ecx, [esp + 0x180]
            //   6a66                 | push                0x66
            //   88842491010000       | mov                 byte ptr [esp + 0x191], al
            //   e8????????           |                     
            //   0472                 | add                 al, 0x72
            //   8d8c2480010000       | lea                 ecx, [esp + 0x180]
            //   6a66                 | push                0x66

        $sequence_8 = { 3445 88442417 8b442408 040c 3450 88442418 8b442408 }
            // n = 7, score = 200
            //   3445                 | xor                 al, 0x45
            //   88442417             | mov                 byte ptr [esp + 0x17], al
            //   8b442408             | mov                 eax, dword ptr [esp + 8]
            //   040c                 | add                 al, 0xc
            //   3450                 | xor                 al, 0x50
            //   88442418             | mov                 byte ptr [esp + 0x18], al
            //   8b442408             | mov                 eax, dword ptr [esp + 8]

        $sequence_9 = { 0420 6a05 8d8c24f4000000 888424fc000000 e8???????? 0477 8d8c24f0000000 }
            // n = 7, score = 200
            //   0420                 | add                 al, 0x20
            //   6a05                 | push                5
            //   8d8c24f4000000       | lea                 ecx, [esp + 0xf4]
            //   888424fc000000       | mov                 byte ptr [esp + 0xfc], al
            //   e8????????           |                     
            //   0477                 | add                 al, 0x77
            //   8d8c24f0000000       | lea                 ecx, [esp + 0xf0]

    condition:
        7 of them and filesize < 745472
}