rule win_unidentified_042_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.unidentified_042."
        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_042"
        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 = { 8975a8 3355ac d1c2 8955ac c1c705 03fa 8b55ec }
            // n = 7, score = 100
            //   8975a8               | mov                 dword ptr [ebp - 0x58], esi
            //   3355ac               | xor                 edx, dword ptr [ebp - 0x54]
            //   d1c2                 | rol                 edx, 1
            //   8955ac               | mov                 dword ptr [ebp - 0x54], edx
            //   c1c705               | rol                 edi, 5
            //   03fa                 | add                 edi, edx
            //   8b55ec               | mov                 edx, dword ptr [ebp - 0x14]

        $sequence_1 = { 75e7 57 8bde e8???????? 83c404 85c0 75d8 }
            // n = 7, score = 100
            //   75e7                 | jne                 0xffffffe9
            //   57                   | push                edi
            //   8bde                 | mov                 ebx, esi
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   85c0                 | test                eax, eax
            //   75d8                 | jne                 0xffffffda

        $sequence_2 = { 8bb578eaffff 8b9d7ceaffff 43 899d7ceaffff 3bde 0f8ce0fdffff e9???????? }
            // n = 7, score = 100
            //   8bb578eaffff         | mov                 esi, dword ptr [ebp - 0x1588]
            //   8b9d7ceaffff         | mov                 ebx, dword ptr [ebp - 0x1584]
            //   43                   | inc                 ebx
            //   899d7ceaffff         | mov                 dword ptr [ebp - 0x1584], ebx
            //   3bde                 | cmp                 ebx, esi
            //   0f8ce0fdffff         | jl                  0xfffffde6
            //   e9????????           |                     

        $sequence_3 = { 8be5 5d c3 0fb7852cf9ffff e8???????? 8b8d34f9ffff 8981ac000000 }
            // n = 7, score = 100
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   0fb7852cf9ffff       | movzx               eax, word ptr [ebp - 0x6d4]
            //   e8????????           |                     
            //   8b8d34f9ffff         | mov                 ecx, dword ptr [ebp - 0x6cc]
            //   8981ac000000         | mov                 dword ptr [ecx + 0xac], eax

        $sequence_4 = { f6865402000002 8b7dfc 7568 8b450c e9???????? b853ffffff }
            // n = 6, score = 100
            //   f6865402000002       | test                byte ptr [esi + 0x254], 2
            //   8b7dfc               | mov                 edi, dword ptr [ebp - 4]
            //   7568                 | jne                 0x6a
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   e9????????           |                     
            //   b853ffffff           | mov                 eax, 0xffffff53

        $sequence_5 = { 8d4df8 d1c3 51 895df8 8955fc e8???????? 8d9680000000 }
            // n = 7, score = 100
            //   8d4df8               | lea                 ecx, [ebp - 8]
            //   d1c3                 | rol                 ebx, 1
            //   51                   | push                ecx
            //   895df8               | mov                 dword ptr [ebp - 8], ebx
            //   8955fc               | mov                 dword ptr [ebp - 4], edx
            //   e8????????           |                     
            //   8d9680000000         | lea                 edx, [esi + 0x80]

        $sequence_6 = { b908000000 f3a5 c6402b20 8b5308 6a20 81c294010000 52 }
            // n = 7, score = 100
            //   b908000000           | mov                 ecx, 8
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   c6402b20             | mov                 byte ptr [eax + 0x2b], 0x20
            //   8b5308               | mov                 edx, dword ptr [ebx + 8]
            //   6a20                 | push                0x20
            //   81c294010000         | add                 edx, 0x194
            //   52                   | push                edx

        $sequence_7 = { c3 0fb7887c010000 f7c100200000 0f8583fdffff 0fb79050020000 81c900200000 6689887c010000 }
            // n = 7, score = 100
            //   c3                   | ret                 
            //   0fb7887c010000       | movzx               ecx, word ptr [eax + 0x17c]
            //   f7c100200000         | test                ecx, 0x2000
            //   0f8583fdffff         | jne                 0xfffffd89
            //   0fb79050020000       | movzx               edx, word ptr [eax + 0x250]
            //   81c900200000         | or                  ecx, 0x2000
            //   6689887c010000       | mov                 word ptr [eax + 0x17c], cx

        $sequence_8 = { 57 ffd6 a3???????? 85c0 0f8489020000 8d95d7fcffff 52 }
            // n = 7, score = 100
            //   57                   | push                edi
            //   ffd6                 | call                esi
            //   a3????????           |                     
            //   85c0                 | test                eax, eax
            //   0f8489020000         | je                  0x28f
            //   8d95d7fcffff         | lea                 edx, [ebp - 0x329]
            //   52                   | push                edx

        $sequence_9 = { 8bce e8???????? 8b06 f7d8 1bc0 23c3 894608 }
            // n = 7, score = 100
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   f7d8                 | neg                 eax
            //   1bc0                 | sbb                 eax, eax
            //   23c3                 | and                 eax, ebx
            //   894608               | mov                 dword ptr [esi + 8], eax

    condition:
        7 of them and filesize < 516096
}