rule win_unidentified_039_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.unidentified_039."
        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_039"
        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 = { 8b55e0 23ca 0bc1 8b4de4 0bc1 8945e8 8b45e0 }
            // n = 7, score = 100
            //   8b55e0               | mov                 edx, dword ptr [ebp - 0x20]
            //   23ca                 | and                 ecx, edx
            //   0bc1                 | or                  eax, ecx
            //   8b4de4               | mov                 ecx, dword ptr [ebp - 0x1c]
            //   0bc1                 | or                  eax, ecx
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]

        $sequence_1 = { 0fafc1 8b4d34 0fafc1 8b4d28 81e9700a0000 33c1 894530 }
            // n = 7, score = 100
            //   0fafc1               | imul                eax, ecx
            //   8b4d34               | mov                 ecx, dword ptr [ebp + 0x34]
            //   0fafc1               | imul                eax, ecx
            //   8b4d28               | mov                 ecx, dword ptr [ebp + 0x28]
            //   81e9700a0000         | sub                 ecx, 0xa70
            //   33c1                 | xor                 eax, ecx
            //   894530               | mov                 dword ptr [ebp + 0x30], eax

        $sequence_2 = { 41 42 42 6685c0 75f1 5f 5e }
            // n = 7, score = 100
            //   41                   | inc                 ecx
            //   42                   | inc                 edx
            //   42                   | inc                 edx
            //   6685c0               | test                ax, ax
            //   75f1                 | jne                 0xfffffff3
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_3 = { 59 8945e4 ff75fc 56 ff15???????? c745d8de330000 c745f4dd0b0000 }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   56                   | push                esi
            //   ff15????????         |                     
            //   c745d8de330000       | mov                 dword ptr [ebp - 0x28], 0x33de
            //   c745f4dd0b0000       | mov                 dword ptr [ebp - 0xc], 0xbdd

        $sequence_4 = { 8b55e8 2bd1 8b4dec 23d1 8b4de4 0bc2 81f12d2a0000 }
            // n = 7, score = 100
            //   8b55e8               | mov                 edx, dword ptr [ebp - 0x18]
            //   2bd1                 | sub                 edx, ecx
            //   8b4dec               | mov                 ecx, dword ptr [ebp - 0x14]
            //   23d1                 | and                 edx, ecx
            //   8b4de4               | mov                 ecx, dword ptr [ebp - 0x1c]
            //   0bc2                 | or                  eax, edx
            //   81f12d2a0000         | xor                 ecx, 0x2a2d

        $sequence_5 = { 0bc1 8945d8 8b45f0 8b4df4 3bc8 7c0c }
            // n = 6, score = 100
            //   0bc1                 | or                  eax, ecx
            //   8945d8               | mov                 dword ptr [ebp - 0x28], eax
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   3bc8                 | cmp                 ecx, eax
            //   7c0c                 | jl                  0xe

        $sequence_6 = { c74598006b0000 c74594b7040000 c745902b270000 c74588777d0000 c7458c4d5c0000 }
            // n = 5, score = 100
            //   c74598006b0000       | mov                 dword ptr [ebp - 0x68], 0x6b00
            //   c74594b7040000       | mov                 dword ptr [ebp - 0x6c], 0x4b7
            //   c745902b270000       | mov                 dword ptr [ebp - 0x70], 0x272b
            //   c74588777d0000       | mov                 dword ptr [ebp - 0x78], 0x7d77
            //   c7458c4d5c0000       | mov                 dword ptr [ebp - 0x74], 0x5c4d

        $sequence_7 = { c745e8f9580000 c745dc3f1a0000 c745d8ee2c0000 c745e4092b0000 8b45e4 0345d8 0345dc }
            // n = 7, score = 100
            //   c745e8f9580000       | mov                 dword ptr [ebp - 0x18], 0x58f9
            //   c745dc3f1a0000       | mov                 dword ptr [ebp - 0x24], 0x1a3f
            //   c745d8ee2c0000       | mov                 dword ptr [ebp - 0x28], 0x2cee
            //   c745e4092b0000       | mov                 dword ptr [ebp - 0x1c], 0x2b09
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   0345d8               | add                 eax, dword ptr [ebp - 0x28]
            //   0345dc               | add                 eax, dword ptr [ebp - 0x24]

        $sequence_8 = { 8945a4 66c74475a66e00 c7459cf1300000 c7459c4d710000 8b459c 2d540f0000 }
            // n = 6, score = 100
            //   8945a4               | mov                 dword ptr [ebp - 0x5c], eax
            //   66c74475a66e00       | mov                 word ptr [ebp + esi*2 - 0x5a], 0x6e
            //   c7459cf1300000       | mov                 dword ptr [ebp - 0x64], 0x30f1
            //   c7459c4d710000       | mov                 dword ptr [ebp - 0x64], 0x714d
            //   8b459c               | mov                 eax, dword ptr [ebp - 0x64]
            //   2d540f0000           | sub                 eax, 0xf54

        $sequence_9 = { 3505150000 0bc1 8945d0 8b45e0 8b4de4 3bc8 }
            // n = 6, score = 100
            //   3505150000           | xor                 eax, 0x1505
            //   0bc1                 | or                  eax, ecx
            //   8945d0               | mov                 dword ptr [ebp - 0x30], eax
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]
            //   8b4de4               | mov                 ecx, dword ptr [ebp - 0x1c]
            //   3bc8                 | cmp                 ecx, eax

    condition:
        7 of them and filesize < 262144
}