rule win_unidentified_071_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.unidentified_071."
        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_071"
        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 = { 8b442410 894c2428 8a5500 88542438 88542430 }
            // n = 5, score = 400
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]
            //   894c2428             | mov                 dword ptr [esp + 0x28], ecx
            //   8a5500               | mov                 dl, byte ptr [ebp]
            //   88542438             | mov                 byte ptr [esp + 0x38], dl
            //   88542430             | mov                 byte ptr [esp + 0x30], dl

        $sequence_1 = { 64890d00000000 c9 c3 56 8b742410 57 8b7c2410 }
            // n = 7, score = 400
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx
            //   c9                   | leave               
            //   c3                   | ret                 
            //   56                   | push                esi
            //   8b742410             | mov                 esi, dword ptr [esp + 0x10]
            //   57                   | push                edi
            //   8b7c2410             | mov                 edi, dword ptr [esp + 0x10]

        $sequence_2 = { 5e 5d 5b c3 83ec18 55 }
            // n = 6, score = 400
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   5b                   | pop                 ebx
            //   c3                   | ret                 
            //   83ec18               | sub                 esp, 0x18
            //   55                   | push                ebp

        $sequence_3 = { 0f841f510000 c3 833d????????ff 7503 33c0 c3 }
            // n = 6, score = 400
            //   0f841f510000         | je                  0x5125
            //   c3                   | ret                 
            //   833d????????ff       |                     
            //   7503                 | jne                 5
            //   33c0                 | xor                 eax, eax
            //   c3                   | ret                 

        $sequence_4 = { 7411 8b442408 8b10 832000 8916 83410404 eb0a }
            // n = 7, score = 400
            //   7411                 | je                  0x13
            //   8b442408             | mov                 eax, dword ptr [esp + 8]
            //   8b10                 | mov                 edx, dword ptr [eax]
            //   832000               | and                 dword ptr [eax], 0
            //   8916                 | mov                 dword ptr [esi], edx
            //   83410404             | add                 dword ptr [ecx + 4], 4
            //   eb0a                 | jmp                 0xc

        $sequence_5 = { a3???????? a1???????? 3500080000 a3???????? }
            // n = 4, score = 400
            //   a3????????           |                     
            //   a1????????           |                     
            //   3500080000           | xor                 eax, 0x800
            //   a3????????           |                     

        $sequence_6 = { 8b4b14 81e1ffffff8f 81c90000000f e9???????? 8b4b14 81e1ffffff96 }
            // n = 6, score = 400
            //   8b4b14               | mov                 ecx, dword ptr [ebx + 0x14]
            //   81e1ffffff8f         | and                 ecx, 0x8fffffff
            //   81c90000000f         | or                  ecx, 0xf000000
            //   e9????????           |                     
            //   8b4b14               | mov                 ecx, dword ptr [ebx + 0x14]
            //   81e1ffffff96         | and                 ecx, 0x96ffffff

        $sequence_7 = { 894108 8b4214 89410c 8d4208 }
            // n = 4, score = 400
            //   894108               | mov                 dword ptr [ecx + 8], eax
            //   8b4214               | mov                 eax, dword ptr [edx + 0x14]
            //   89410c               | mov                 dword ptr [ecx + 0xc], eax
            //   8d4208               | lea                 eax, [edx + 8]

        $sequence_8 = { 56 8bf1 833e00 7450 ff75f8 56 ff7604 }
            // n = 7, score = 400
            //   56                   | push                esi
            //   8bf1                 | mov                 esi, ecx
            //   833e00               | cmp                 dword ptr [esi], 0
            //   7450                 | je                  0x52
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   56                   | push                esi
            //   ff7604               | push                dword ptr [esi + 4]

        $sequence_9 = { 6b450c18 8b4d08 890e 03c1 894604 }
            // n = 5, score = 400
            //   6b450c18             | imul                eax, dword ptr [ebp + 0xc], 0x18
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   890e                 | mov                 dword ptr [esi], ecx
            //   03c1                 | add                 eax, ecx
            //   894604               | mov                 dword ptr [esi + 4], eax

    condition:
        7 of them and filesize < 1220608
}