rule win_unidentified_041_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.unidentified_041."
        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.unidentified_041"
        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 = { 50 53 e8???????? 83c430 33f6 eb24 837c245408 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c430               | add                 esp, 0x30
            //   33f6                 | xor                 esi, esi
            //   eb24                 | jmp                 0x26
            //   837c245408           | cmp                 dword ptr [esp + 0x54], 8

        $sequence_1 = { 837c245410 720c ff742440 e8???????? 83c404 8b4c2438 83c8ff }
            // n = 7, score = 200
            //   837c245410           | cmp                 dword ptr [esp + 0x54], 0x10
            //   720c                 | jb                  0xe
            //   ff742440             | push                dword ptr [esp + 0x40]
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8b4c2438             | mov                 ecx, dword ptr [esp + 0x38]
            //   83c8ff               | or                  eax, 0xffffffff

        $sequence_2 = { e8???????? 59 ff742410 8bd0 c68424e48300000c 8d4c2458 e8???????? }
            // n = 7, score = 200
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   ff742410             | push                dword ptr [esp + 0x10]
            //   8bd0                 | mov                 edx, eax
            //   c68424e48300000c     | mov                 byte ptr [esp + 0x83e4], 0xc
            //   8d4c2458             | lea                 ecx, [esp + 0x58]
            //   e8????????           |                     

        $sequence_3 = { 895dcc e8???????? 83f8ff b9???????? be???????? 0f45f1 56 }
            // n = 7, score = 200
            //   895dcc               | mov                 dword ptr [ebp - 0x34], ebx
            //   e8????????           |                     
            //   83f8ff               | cmp                 eax, -1
            //   b9????????           |                     
            //   be????????           |                     
            //   0f45f1               | cmovne              esi, ecx
            //   56                   | push                esi

        $sequence_4 = { 884daf eb03 8a4daf 8b7618 8975a4 85f6 75b4 }
            // n = 7, score = 200
            //   884daf               | mov                 byte ptr [ebp - 0x51], cl
            //   eb03                 | jmp                 5
            //   8a4daf               | mov                 cl, byte ptr [ebp - 0x51]
            //   8b7618               | mov                 esi, dword ptr [esi + 0x18]
            //   8975a4               | mov                 dword ptr [ebp - 0x5c], esi
            //   85f6                 | test                esi, esi
            //   75b4                 | jne                 0xffffffb6

        $sequence_5 = { e8???????? 8d4c2444 83c418 6a00 6a01 e8???????? 8b4c2448 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8d4c2444             | lea                 ecx, [esp + 0x44]
            //   83c418               | add                 esp, 0x18
            //   6a00                 | push                0
            //   6a01                 | push                1
            //   e8????????           |                     
            //   8b4c2448             | mov                 ecx, dword ptr [esp + 0x48]

        $sequence_6 = { eb0a c70600000000 c6460401 8b5d9c 85db 0f859f000000 8b5da0 }
            // n = 7, score = 200
            //   eb0a                 | jmp                 0xc
            //   c70600000000         | mov                 dword ptr [esi], 0
            //   c6460401             | mov                 byte ptr [esi + 4], 1
            //   8b5d9c               | mov                 ebx, dword ptr [ebp - 0x64]
            //   85db                 | test                ebx, ebx
            //   0f859f000000         | jne                 0xa5
            //   8b5da0               | mov                 ebx, dword ptr [ebp - 0x60]

        $sequence_7 = { 895dfc 391cfd28f64700 7518 53 68a00f0000 56 e8???????? }
            // n = 7, score = 200
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   391cfd28f64700       | cmp                 dword ptr [edi*8 + 0x47f628], ebx
            //   7518                 | jne                 0x1a
            //   53                   | push                ebx
            //   68a00f0000           | push                0xfa0
            //   56                   | push                esi
            //   e8????????           |                     

        $sequence_8 = { c645fc08 837a1408 7202 8b12 8b856cffffff 8b0d???????? ff707c }
            // n = 7, score = 200
            //   c645fc08             | mov                 byte ptr [ebp - 4], 8
            //   837a1408             | cmp                 dword ptr [edx + 0x14], 8
            //   7202                 | jb                  4
            //   8b12                 | mov                 edx, dword ptr [edx]
            //   8b856cffffff         | mov                 eax, dword ptr [ebp - 0x94]
            //   8b0d????????         |                     
            //   ff707c               | push                dword ptr [eax + 0x7c]

        $sequence_9 = { 8b4754 8d4f04 ff7768 89474c 8907 e8???????? ff7768 }
            // n = 7, score = 200
            //   8b4754               | mov                 eax, dword ptr [edi + 0x54]
            //   8d4f04               | lea                 ecx, [edi + 4]
            //   ff7768               | push                dword ptr [edi + 0x68]
            //   89474c               | mov                 dword ptr [edi + 0x4c], eax
            //   8907                 | mov                 dword ptr [edi], eax
            //   e8????????           |                     
            //   ff7768               | push                dword ptr [edi + 0x68]

    condition:
        7 of them and filesize < 1097728
}