rule win_railsetter_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.railsetter."
        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.railsetter"
        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 = { 33c9 894c2448 4585c9 742d 488d05e6f40200 488903 48894b18 }
            // n = 7, score = 100
            //   33c9                 | mov                 edx, esi
            //   894c2448             | jmp                 0x8a3
            //   4585c9               | dec                 eax
            //   742d                 | mov                 eax, edi
            //   488d05e6f40200       | dec                 eax
            //   488903               | lea                 edx, [0x4bb2c]
            //   48894b18             | dec                 eax

        $sequence_1 = { 0f1006 0f294517 4883781000 7415 41b802000000 488d153e310500 }
            // n = 6, score = 100
            //   0f1006               | mov                 eax, dword ptr [ebp + 0x138]
            //   0f294517             | dec                 ecx
            //   4883781000           | add                 eax, 0xc0
            //   7415                 | dec                 eax
            //   41b802000000         | lea                 eax, [ebp + 0x290]
            //   488d153e310500       | dec                 ecx

        $sequence_2 = { 488d0d24f60200 0f57c0 4889442420 48890b 488d5308 488d4c2420 0f1102 }
            // n = 7, score = 100
            //   488d0d24f60200       | dec                 eax
            //   0f57c0               | cmp                 dword ptr [ebp + 0x260], 0
            //   4889442420           | seta                cl
            //   48890b               | mov                 byte ptr [esp + 0x20], cl
            //   488d5308             | inc                 esp
            //   488d4c2420           | mov                 ecx, esi
            //   0f1102               | dec                 esp

        $sequence_3 = { b903000000 4c8d05a7920200 e8???????? 488bd3 8bcf 4885c0 7408 }
            // n = 7, score = 100
            //   b903000000           | ja                  0xc2f
            //   4c8d05a7920200       | dec                 ecx
            //   e8????????           |                     
            //   488bd3               | mov                 ecx, eax
            //   8bcf                 | dec                 eax
            //   4885c0               | add                 edx, 0x27
            //   7408                 | dec                 esp

        $sequence_4 = { 488d1d9eef0000 eb52 bac0020000 b901000000 e8???????? 488bd8 4885c0 }
            // n = 7, score = 100
            //   488d1d9eef0000       | movaps              xmm3, xmm6
            //   eb52                 | dec                 cx
            //   bac0020000           | movd                ecx, mm6
            //   b901000000           | dec                 eax
            //   e8????????           |                     
            //   488bd8               | mov                 ecx, eax
            //   4885c0               | dec                 eax

        $sequence_5 = { 33d2 41b810010000 488d4df4 e8???????? c745f014010000 488d4df0 ff15???????? }
            // n = 7, score = 100
            //   33d2                 | lea                 eax, [ebp - 0x70]
            //   41b810010000         | dec                 eax
            //   488d4df4             | mov                 dword ptr [esp + 0x38], eax
            //   e8????????           |                     
            //   c745f014010000       | dec                 eax
            //   488d4df0             | lea                 edx, [ebp + 0x290]
            //   ff15????????         |                     

        $sequence_6 = { 48896810 48897018 48897820 4156 33ed 4c8d3576470100 }
            // n = 6, score = 100
            //   48896810             | mov                 byte ptr [ebx + 0x54], 1
            //   48897018             | jmp                 0x77
            //   48897820             | mov                 dword ptr [ebx + 0x50], eax
            //   4156                 | jmp                 0x73
            //   33ed                 | dec                 eax
            //   4c8d3576470100       | lea                 ecx, [0x26e6a]

        $sequence_7 = { 498bc2 458bf1 48c1f806 488d0d08bf0200 4183e23f 4d03f0 49c1e206 }
            // n = 7, score = 100
            //   498bc2               | lea                 edx, [0x45a1f]
            //   458bf1               | jmp                 0x1037
            //   48c1f806             | dec                 eax
            //   488d0d08bf0200       | lea                 edx, [0x45a22]
            //   4183e23f             | dec                 eax
            //   4d03f0               | lea                 ecx, [0x52bf3]
            //   49c1e206             | jmp                 0x1050

        $sequence_8 = { 48c745780f000000 44886d60 ba20000000 488d0def160500 e8???????? c744243010000000 488d542430 }
            // n = 7, score = 100
            //   48c745780f000000     | xorps               xmm0, xmm0
            //   44886d60             | ucomisd             xmm0, xmm1
            //   ba20000000           | ja                  0x1881
            //   488d0def160500       | sqrtpd              xmm0, xmm1
            //   e8????????           |                     
            //   c744243010000000     | dec                 cx
            //   488d542430           | movd                ecx, mm3

        $sequence_9 = { 48894517 c6451f01 488d4d17 e8???????? 488d05b94a0400 488903 488b55e7 }
            // n = 7, score = 100
            //   48894517             | lea                 ecx, [0x4d459]
            //   c6451f01             | mov                 edx, 0x35
            //   488d4d17             | dec                 cx
            //   e8????????           |                     
            //   488d05b94a0400       | movd                eax, mm2
            //   488903               | dec                 ax
            //   488b55e7             | movd                edx, mm1

    condition:
        7 of them and filesize < 866304
}