rule win_koadic_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        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 = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { 55 8bf8 e8???????? 8b4c2410 8944242c 8b44243c }
            // n = 6, score = 100
            //   55                   | push                ebp
            //   8bf8                 | mov                 edi, eax
            //   e8????????           |                     
            //   8b4c2410             | mov                 ecx, dword ptr [esp + 0x10]
            //   8944242c             | mov                 dword ptr [esp + 0x2c], eax
            //   8b44243c             | mov                 eax, dword ptr [esp + 0x3c]

        $sequence_1 = { 85c0 7406 85ff 759d eb04 8365fc00 ff75f8 }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   7406                 | je                  8
            //   85ff                 | test                edi, edi
            //   759d                 | jne                 0xffffff9f
            //   eb04                 | jmp                 6
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   ff75f8               | push                dword ptr [ebp - 8]

        $sequence_2 = { 885e30 5b 894e04 5e 59 c20800 8b542410 }
            // n = 7, score = 100
            //   885e30               | mov                 byte ptr [esi + 0x30], bl
            //   5b                   | pop                 ebx
            //   894e04               | mov                 dword ptr [esi + 4], ecx
            //   5e                   | pop                 esi
            //   59                   | pop                 ecx
            //   c20800               | ret                 8
            //   8b542410             | mov                 edx, dword ptr [esp + 0x10]

        $sequence_3 = { 83c702 eb08 f7df 1bff 83e703 47 57 }
            // n = 7, score = 100
            //   83c702               | add                 edi, 2
            //   eb08                 | jmp                 0xa
            //   f7df                 | neg                 edi
            //   1bff                 | sbb                 edi, edi
            //   83e703               | and                 edi, 3
            //   47                   | inc                 edi
            //   57                   | push                edi

        $sequence_4 = { 83f8f9 0f8491000000 83f8fa 747e 83f8fb 7461 }
            // n = 6, score = 100
            //   83f8f9               | cmp                 eax, -7
            //   0f8491000000         | je                  0x97
            //   83f8fa               | cmp                 eax, -6
            //   747e                 | je                  0x80
            //   83f8fb               | cmp                 eax, -5
            //   7461                 | je                  0x63

        $sequence_5 = { 8945fc 85c0 7457 53 50 ff36 ff15???????? }
            // n = 7, score = 100
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   85c0                 | test                eax, eax
            //   7457                 | je                  0x59
            //   53                   | push                ebx
            //   50                   | push                eax
            //   ff36                 | push                dword ptr [esi]
            //   ff15????????         |                     

        $sequence_6 = { ff35???????? ff35???????? ff35???????? e8???????? 8d0584334100 50 e8???????? }
            // n = 7, score = 100
            //   ff35????????         |                     
            //   ff35????????         |                     
            //   ff35????????         |                     
            //   e8????????           |                     
            //   8d0584334100         | lea                 eax, [0x413384]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_7 = { eb08 c744241000000000 56 e8???????? 8b6c242c 55 8bf8 }
            // n = 7, score = 100
            //   eb08                 | jmp                 0xa
            //   c744241000000000     | mov                 dword ptr [esp + 0x10], 0
            //   56                   | push                esi
            //   e8????????           |                     
            //   8b6c242c             | mov                 ebp, dword ptr [esp + 0x2c]
            //   55                   | push                ebp
            //   8bf8                 | mov                 edi, eax

        $sequence_8 = { ff15???????? 8bd8 3bdf 743b 57 8d45f8 }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   8bd8                 | mov                 ebx, eax
            //   3bdf                 | cmp                 ebx, edi
            //   743b                 | je                  0x3d
            //   57                   | push                edi
            //   8d45f8               | lea                 eax, [ebp - 8]

        $sequence_9 = { 0f8466020000 836c241408 83e808 8b542414 89442424 8b38 8b7204 }
            // n = 7, score = 100
            //   0f8466020000         | je                  0x26c
            //   836c241408           | sub                 dword ptr [esp + 0x14], 8
            //   83e808               | sub                 eax, 8
            //   8b542414             | mov                 edx, dword ptr [esp + 0x14]
            //   89442424             | mov                 dword ptr [esp + 0x24], eax
            //   8b38                 | mov                 edi, dword ptr [eax]
            //   8b7204               | mov                 esi, dword ptr [edx + 4]

    condition:
        7 of them and filesize < 180224
}