rule win_funksec_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.funksec."
        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.funksec"
        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 = { eb32 410fb6411c 450fb64101 410fb65102 410f104103 0f2985c0050000 450fb6511b }
            // n = 7, score = 100
            //   eb32                 | dec                 eax
            //   410fb6411c           | mov                 ecx, dword ptr [ebp + 0xa8]
            //   450fb64101           | cmp                 dword ptr [ebp + 0x3c8], 3
            //   410fb65102           | je                  0x3cf
            //   410f104103           | mov                 byte ptr [ebp + 0x3ef], 0
            //   0f2985c0050000       | jmp                 0x3f4
            //   450fb6511b           | dec                 eax

        $sequence_1 = { eb3f c6858f00000000 c6858e00000000 4c8d05cf7a2300 4c89f1 e8???????? eb20 }
            // n = 7, score = 100
            //   eb3f                 | mov                 dword ptr [esp + 0x44], eax
            //   c6858f00000000       | dec                 ecx
            //   c6858e00000000       | add                 ebp, 0x14
            //   4c8d05cf7a2300       | jmp                 0x1ba
            //   4c89f1               | mov                 ecx, 8
            //   e8????????           |                     
            //   eb20                 | mov                 edx, 0x10d8

        $sequence_2 = { e9???????? 48c1e808 488b7de8 4939f6 0f8288feffff 4c8d054bf31000 4c89f1 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   48c1e808             | lea                 eax, [0x13f5f]
            //   488b7de8             | dec                 eax
            //   4939f6               | mov                 dword ptr [esp + 0x90], eax
            //   0f8288feffff         | dec                 eax
            //   4c8d054bf31000       | lea                 eax, [0x2021e8]
            //   4c89f1               | dec                 eax

        $sequence_3 = { f3410f6f4c0d10 660fefd2 660ff8d0 660fdad0 660fefc0 660ff8c1 660fdac1 }
            // n = 7, score = 100
            //   f3410f6f4c0d10       | movdqu              xmmword ptr [eax + 0x210], xmm1
            //   660fefd2             | movdqu              xmmword ptr [eax + 0x200], xmm0
            //   660ff8d0             | movdqu              xmmword ptr [eax + 0x2f0], xmm7
            //   660fdad0             | movdqu              xmmword ptr [eax + 0x2e0], xmm6
            //   660fefc0             | movdqu              xmmword ptr [eax + 0x2d0], xmm5
            //   660ff8c1             | movdqu              xmmword ptr [eax + 0x330], xmm3
            //   660fdac1             | movdqu              xmmword ptr [eax + 0x320], xmm2

        $sequence_4 = { f04c0fb137 0f8428020000 4183fd06 b806000000 410f42c5 b901000000 4585ed }
            // n = 7, score = 100
            //   f04c0fb137           | mov                 ecx, 1
            //   0f8428020000         | inc                 ebp
            //   4183fd06             | test                edi, edi
            //   b806000000           |                     
            //   410f42c5             | mov                 eax, 6
            //   b901000000           | inc                 ecx
            //   4585ed               | cmovb               eax, ebp

        $sequence_5 = { e8???????? 4889c3 4885c0 7453 0f1005???????? 0f1103 c6431072 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   4889c3               | mov                 ecx, eax
            //   4885c0               | dec                 eax
            //   7453                 | or                  ecx, edx
            //   0f1005????????       |                     
            //   0f1103               | jne                 0x42b
            //   c6431072             | cmp                 dword ptr [ebx + 0x100], 4

        $sequence_6 = { f3420f6f0433 66440fd7d0 4983c310 4585d2 74e6 f3450fbcd2 4d01f2 }
            // n = 7, score = 100
            //   f3420f6f0433         | dec                 esp
            //   66440fd7d0           | mov                 eax, edi
            //   4983c310             | dec                 esp
            //   4585d2               | sub                 eax, edx
            //   74e6                 | dec                 eax
            //   f3450fbcd2           | mov                 edi, esi
            //   4d01f2               | dec                 esp

        $sequence_7 = { eb4d 4983c403 c1e10c 09ca 4189d5 4181fd00010000 7338 }
            // n = 7, score = 100
            //   eb4d                 | test                edx, edx
            //   4983c403             | je                  0xb8
            //   c1e10c               | dec                 eax
            //   09ca                 | mov                 ecx, dword ptr [esi + 0x30]
            //   4189d5               | dec                 eax
            //   4181fd00010000       | shl                 edx, 5
            //   7338                 | inc                 ecx

        $sequence_8 = { e8???????? c7451000000000 488b5dd0 4c8b65d8 41bd04000000 4c8d7510 488b75e0 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   c7451000000000       | pop                 ebx
            //   488b5dd0             | pop                 edi
            //   4c8b65d8             | pop                 esi
            //   41bd04000000         | inc                 ecx
            //   4c8d7510             | pop                 esp
            //   488b75e0             | mov                 byte ptr [ebp + 0x15f], 0

        $sequence_9 = { ff5018 488b45f0 488b8010020000 4885c0 7416 f048ff08 7510 }
            // n = 7, score = 100
            //   ff5018               | dec                 eax
            //   488b45f0             | mov                 ecx, dword ptr [ecx + 0x90]
            //   488b8010020000       | xor                 edx, edx
            //   4885c0               | dec                 eax
            //   7416                 | test                eax, eax
            //   f048ff08             | dec                 ebp
            //   7510                 | test                esp, esp

    condition:
        7 of them and filesize < 10986496
}