rule win_sparrow_door_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.sparrow_door."
        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.sparrow_door"
        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 = { 8dbc2498000000 83c250 f3a5 6a40 89542430 }
            // n = 5, score = 100
            //   8dbc2498000000       | lea                 edi, [esp + 0x98]
            //   83c250               | add                 edx, 0x50
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   6a40                 | push                0x40
            //   89542430             | mov                 dword ptr [esp + 0x30], edx

        $sequence_1 = { 7610 33c9 39b0e8002a00 0f95c1 894de4 eb03 8975e4 }
            // n = 7, score = 100
            //   7610                 | jbe                 0x12
            //   33c9                 | xor                 ecx, ecx
            //   39b0e8002a00         | cmp                 dword ptr [eax + 0x2a00e8], esi
            //   0f95c1               | setne               cl
            //   894de4               | mov                 dword ptr [ebp - 0x1c], ecx
            //   eb03                 | jmp                 5
            //   8975e4               | mov                 dword ptr [ebp - 0x1c], esi

        $sequence_2 = { 53 6a01 52 ffd7 6a40 8d442438 53 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   6a01                 | push                1
            //   52                   | push                edx
            //   ffd7                 | call                edi
            //   6a40                 | push                0x40
            //   8d442438             | lea                 eax, [esp + 0x38]
            //   53                   | push                ebx

        $sequence_3 = { 83c250 f3a5 6a40 89542430 33f6 8d542458 56 }
            // n = 7, score = 100
            //   83c250               | add                 edx, 0x50
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   6a40                 | push                0x40
            //   89542430             | mov                 dword ptr [esp + 0x30], edx
            //   33f6                 | xor                 esi, esi
            //   8d542458             | lea                 edx, [esp + 0x58]
            //   56                   | push                esi

        $sequence_4 = { 6a00 6a00 8d8424d8050000 50 }
            // n = 4, score = 100
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   8d8424d8050000       | lea                 eax, [esp + 0x5d8]
            //   50                   | push                eax

        $sequence_5 = { c644241400 e8???????? 6882050000 8d4c2458 6a00 51 e8???????? }
            // n = 7, score = 100
            //   c644241400           | mov                 byte ptr [esp + 0x14], 0
            //   e8????????           |                     
            //   6882050000           | push                0x582
            //   8d4c2458             | lea                 ecx, [esp + 0x58]
            //   6a00                 | push                0
            //   51                   | push                ecx
            //   e8????????           |                     

        $sequence_6 = { 8d8c2400010000 51 56 52 ffd5 }
            // n = 5, score = 100
            //   8d8c2400010000       | lea                 ecx, [esp + 0x100]
            //   51                   | push                ecx
            //   56                   | push                esi
            //   52                   | push                edx
            //   ffd5                 | call                ebp

        $sequence_7 = { ffd7 53 8d442418 50 8d4c2418 51 68???????? }
            // n = 7, score = 100
            //   ffd7                 | call                edi
            //   53                   | push                ebx
            //   8d442418             | lea                 eax, [esp + 0x18]
            //   50                   | push                eax
            //   8d4c2418             | lea                 ecx, [esp + 0x18]
            //   51                   | push                ecx
            //   68????????           |                     

        $sequence_8 = { 89842438060000 55 56 57 33c0 }
            // n = 5, score = 100
            //   89842438060000       | mov                 dword ptr [esp + 0x638], eax
            //   55                   | push                ebp
            //   56                   | push                esi
            //   57                   | push                edi
            //   33c0                 | xor                 eax, eax

        $sequence_9 = { 8b8c2404100000 5f 5e 5d }
            // n = 4, score = 100
            //   8b8c2404100000       | mov                 ecx, dword ptr [esp + 0x1004]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp

    condition:
        7 of them and filesize < 155648
}