rule win_koadic_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.koadic."
        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.koadic"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 83f8ff 743e 50 55 ff15???????? 837e10ff 7530 }
            // n = 7, score = 100
            //   83f8ff               | cmp                 eax, -1
            //   743e                 | je                  0x40
            //   50                   | push                eax
            //   55                   | push                ebp
            //   ff15????????         |                     
            //   837e10ff             | cmp                 dword ptr [esi + 0x10], -1
            //   7530                 | jne                 0x32

        $sequence_1 = { 752b 56 6a14 68???????? e8???????? 8bf0 59 }
            // n = 7, score = 100
            //   752b                 | jne                 0x2d
            //   56                   | push                esi
            //   6a14                 | push                0x14
            //   68????????           |                     
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   59                   | pop                 ecx

        $sequence_2 = { ff75f8 ff15???????? 5e 395dfc }
            // n = 4, score = 100
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   ff15????????         |                     
            //   5e                   | pop                 esi
            //   395dfc               | cmp                 dword ptr [ebp - 4], ebx

        $sequence_3 = { e8???????? 8f05???????? ff742408 e8???????? 68???????? ff74240c e8???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8f05????????         |                     
            //   ff742408             | push                dword ptr [esp + 8]
            //   e8????????           |                     
            //   68????????           |                     
            //   ff74240c             | push                dword ptr [esp + 0xc]
            //   e8????????           |                     

        $sequence_4 = { 8b5c2414 8b2d???????? c1e303 01dd 58 894504 8b5c2410 }
            // n = 7, score = 100
            //   8b5c2414             | mov                 ebx, dword ptr [esp + 0x14]
            //   8b2d????????         |                     
            //   c1e303               | shl                 ebx, 3
            //   01dd                 | add                 ebp, ebx
            //   58                   | pop                 eax
            //   894504               | mov                 dword ptr [ebp + 4], eax
            //   8b5c2410             | mov                 ebx, dword ptr [esp + 0x10]

        $sequence_5 = { e8???????? ff3424 e8???????? eb36 ff35???????? ff35???????? }
            // n = 6, score = 100
            //   e8????????           |                     
            //   ff3424               | push                dword ptr [esp]
            //   e8????????           |                     
            //   eb36                 | jmp                 0x38
            //   ff35????????         |                     
            //   ff35????????         |                     

        $sequence_6 = { c705????????c49d4000 c705????????01000000 837d1c00 7507 c7451c02104100 8b4d20 6a00 }
            // n = 7, score = 100
            //   c705????????c49d4000     |     
            //   c705????????01000000     |     
            //   837d1c00             | cmp                 dword ptr [ebp + 0x1c], 0
            //   7507                 | jne                 9
            //   c7451c02104100       | mov                 dword ptr [ebp + 0x1c], 0x411002
            //   8b4d20               | mov                 ecx, dword ptr [ebp + 0x20]
            //   6a00                 | push                0

        $sequence_7 = { 895508 e9???????? 0fb745fc 25f8000000 3df0000000 0f85c0000000 }
            // n = 6, score = 100
            //   895508               | mov                 dword ptr [ebp + 8], edx
            //   e9????????           |                     
            //   0fb745fc             | movzx               eax, word ptr [ebp - 4]
            //   25f8000000           | and                 eax, 0xf8
            //   3df0000000           | cmp                 eax, 0xf0
            //   0f85c0000000         | jne                 0xc6

        $sequence_8 = { 0f8487000000 57 6880000000 6a03 57 6a01 6800000080 }
            // n = 7, score = 100
            //   0f8487000000         | je                  0x8d
            //   57                   | push                edi
            //   6880000000           | push                0x80
            //   6a03                 | push                3
            //   57                   | push                edi
            //   6a01                 | push                1
            //   6800000080           | push                0x80000000

        $sequence_9 = { 43 81e3ff000000 895c2404 8b5c2410 8b7c2404 8b6c2428 c1e702 }
            // n = 7, score = 100
            //   43                   | inc                 ebx
            //   81e3ff000000         | and                 ebx, 0xff
            //   895c2404             | mov                 dword ptr [esp + 4], ebx
            //   8b5c2410             | mov                 ebx, dword ptr [esp + 0x10]
            //   8b7c2404             | mov                 edi, dword ptr [esp + 4]
            //   8b6c2428             | mov                 ebp, dword ptr [esp + 0x28]
            //   c1e702               | shl                 edi, 2

    condition:
        7 of them and filesize < 180224
}