rule win_unidentified_039_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "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 = { c745dc904a0000 8945fc 8b45dc 8b4dec 8d8401f1e3ffff 8b4d0c }
            // n = 6, score = 100
            //   c745dc904a0000       | mov                 dword ptr [ebp - 0x24], 0x4a90
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8b45dc               | mov                 eax, dword ptr [ebp - 0x24]
            //   8b4dec               | mov                 ecx, dword ptr [ebp - 0x14]
            //   8d8401f1e3ffff       | lea                 eax, [ecx + eax - 0x1c0f]
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]

        $sequence_1 = { 8945f0 8b450c 8945f4 8b4514 40 c745ecaa344100 894df8 }
            // n = 7, score = 100
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   8b4514               | mov                 eax, dword ptr [ebp + 0x14]
            //   40                   | inc                 eax
            //   c745ecaa344100       | mov                 dword ptr [ebp - 0x14], 0x4134aa
            //   894df8               | mov                 dword ptr [ebp - 8], ecx

        $sequence_2 = { c745f4296f0000 c745fcf67e0000 c745f8d31b0000 c745e89d4e0000 c745f4930f0000 c745f064200000 }
            // n = 6, score = 100
            //   c745f4296f0000       | mov                 dword ptr [ebp - 0xc], 0x6f29
            //   c745fcf67e0000       | mov                 dword ptr [ebp - 4], 0x7ef6
            //   c745f8d31b0000       | mov                 dword ptr [ebp - 8], 0x1bd3
            //   c745e89d4e0000       | mov                 dword ptr [ebp - 0x18], 0x4e9d
            //   c745f4930f0000       | mov                 dword ptr [ebp - 0xc], 0xf93
            //   c745f064200000       | mov                 dword ptr [ebp - 0x10], 0x2064

        $sequence_3 = { 0fbe06 50 ff7508 e8???????? 0fbec0 0fbe80a8b04100 }
            // n = 6, score = 100
            //   0fbe06               | movsx               eax, byte ptr [esi]
            //   50                   | push                eax
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   0fbec0               | movsx               eax, al
            //   0fbe80a8b04100       | movsx               eax, byte ptr [eax + 0x41b0a8]

        $sequence_4 = { e8???????? 59 8945f4 ff75ec 8b5d08 8b3d???????? 53 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   ff75ec               | push                dword ptr [ebp - 0x14]
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]
            //   8b3d????????         |                     
            //   53                   | push                ebx

        $sequence_5 = { 0fafc1 56 57 33f6 56 6a01 }
            // n = 6, score = 100
            //   0fafc1               | imul                eax, ecx
            //   56                   | push                esi
            //   57                   | push                edi
            //   33f6                 | xor                 esi, esi
            //   56                   | push                esi
            //   6a01                 | push                1

        $sequence_6 = { c74538d2430000 c74528ac320000 c7453821650000 8b4538 8b4d28 69c0103b0000 33c1 }
            // n = 7, score = 100
            //   c74538d2430000       | mov                 dword ptr [ebp + 0x38], 0x43d2
            //   c74528ac320000       | mov                 dword ptr [ebp + 0x28], 0x32ac
            //   c7453821650000       | mov                 dword ptr [ebp + 0x38], 0x6521
            //   8b4538               | mov                 eax, dword ptr [ebp + 0x38]
            //   8b4d28               | mov                 ecx, dword ptr [ebp + 0x28]
            //   69c0103b0000         | imul                eax, eax, 0x3b10
            //   33c1                 | xor                 eax, ecx

        $sequence_7 = { 034dec 8b45f0 2dc9200000 33c8 8b45f4 0bc8 8b45f8 }
            // n = 7, score = 100
            //   034dec               | add                 ecx, dword ptr [ebp - 0x14]
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   2dc9200000           | sub                 eax, 0x20c9
            //   33c8                 | xor                 ecx, eax
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   0bc8                 | or                  ecx, eax
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]

        $sequence_8 = { e8???????? 59 c3 e8???????? c3 6a14 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   c3                   | ret                 
            //   e8????????           |                     
            //   c3                   | ret                 
            //   6a14                 | push                0x14

        $sequence_9 = { ff75d4 ff15???????? c745f0b24c0000 c745ec44770000 c745e85c2d0000 }
            // n = 5, score = 100
            //   ff75d4               | push                dword ptr [ebp - 0x2c]
            //   ff15????????         |                     
            //   c745f0b24c0000       | mov                 dword ptr [ebp - 0x10], 0x4cb2
            //   c745ec44770000       | mov                 dword ptr [ebp - 0x14], 0x7744
            //   c745e85c2d0000       | mov                 dword ptr [ebp - 0x18], 0x2d5c

    condition:
        7 of them and filesize < 262144
}