rule win_koadic_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 011424 ff35???????? e8???????? 89c5 c7450001000000 ff35???????? }
            // n = 6, score = 100
            //   011424               | add                 dword ptr [esp], edx
            //   ff35????????         |                     
            //   e8????????           |                     
            //   89c5                 | mov                 ebp, eax
            //   c7450001000000       | mov                 dword ptr [ebp], 1
            //   ff35????????         |                     

        $sequence_1 = { 8d442424 50 e8???????? eb0f 8d4c2418 }
            // n = 5, score = 100
            //   8d442424             | lea                 eax, [esp + 0x24]
            //   50                   | push                eax
            //   e8????????           |                     
            //   eb0f                 | jmp                 0x11
            //   8d4c2418             | lea                 ecx, [esp + 0x18]

        $sequence_2 = { 6810000000 ff35???????? e8???????? 68???????? e8???????? 8b15???????? }
            // n = 6, score = 100
            //   6810000000           | push                0x10
            //   ff35????????         |                     
            //   e8????????           |                     
            //   68????????           |                     
            //   e8????????           |                     
            //   8b15????????         |                     

        $sequence_3 = { ff3424 e8???????? 8b1424 ff35???????? e8???????? 58 }
            // n = 6, score = 100
            //   ff3424               | push                dword ptr [esp]
            //   e8????????           |                     
            //   8b1424               | mov                 edx, dword ptr [esp]
            //   ff35????????         |                     
            //   e8????????           |                     
            //   58                   | pop                 eax

        $sequence_4 = { 8b4c241c 894f04 885d30 5f 5e 5b }
            // n = 6, score = 100
            //   8b4c241c             | mov                 ecx, dword ptr [esp + 0x1c]
            //   894f04               | mov                 dword ptr [edi + 4], ecx
            //   885d30               | mov                 byte ptr [ebp + 0x30], bl
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_5 = { 50 e8???????? eb29 6a08 51 845c2420 7411 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   eb29                 | jmp                 0x2b
            //   6a08                 | push                8
            //   51                   | push                ecx
            //   845c2420             | test                byte ptr [esp + 0x20], bl
            //   7411                 | je                  0x13

        $sequence_6 = { ff7500 58 a3???????? 8b6c240c ff7500 58 a3???????? }
            // n = 7, score = 100
            //   ff7500               | push                dword ptr [ebp]
            //   58                   | pop                 eax
            //   a3????????           |                     
            //   8b6c240c             | mov                 ebp, dword ptr [esp + 0xc]
            //   ff7500               | push                dword ptr [ebp]
            //   58                   | pop                 eax
            //   a3????????           |                     

        $sequence_7 = { 83feff 0f8580fdffff 8bc8 8b450c 5e 3bc8 7d1d }
            // n = 7, score = 100
            //   83feff               | cmp                 esi, -1
            //   0f8580fdffff         | jne                 0xfffffd86
            //   8bc8                 | mov                 ecx, eax
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   5e                   | pop                 esi
            //   3bc8                 | cmp                 ecx, eax
            //   7d1d                 | jge                 0x1f

        $sequence_8 = { 8b4614 55 8b6c241c 57 8b3d???????? }
            // n = 5, score = 100
            //   8b4614               | mov                 eax, dword ptr [esi + 0x14]
            //   55                   | push                ebp
            //   8b6c241c             | mov                 ebp, dword ptr [esp + 0x1c]
            //   57                   | push                edi
            //   8b3d????????         |                     

        $sequence_9 = { e8???????? ff35???????? e8???????? 8d442410 50 e8???????? ff35???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   ff35????????         |                     
            //   e8????????           |                     
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   50                   | push                eax
            //   e8????????           |                     
            //   ff35????????         |                     

    condition:
        7 of them and filesize < 180224
}