rule win_koadic_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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 = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 56 ff75fc 56 6838330000 e9???????? 8bc3 2d03020000 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   56                   | push                esi
            //   6838330000           | push                0x3338
            //   e9????????           |                     
            //   8bc3                 | mov                 eax, ebx
            //   2d03020000           | sub                 eax, 0x203

        $sequence_1 = { 5b c20400 55 8bec 837d0800 7414 }
            // n = 6, score = 100
            //   5b                   | pop                 ebx
            //   c20400               | ret                 4
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   837d0800             | cmp                 dword ptr [ebp + 8], 0
            //   7414                 | je                  0x16

        $sequence_2 = { 7439 f7c300000001 740c f7df 1bff }
            // n = 5, score = 100
            //   7439                 | je                  0x3b
            //   f7c300000001         | test                ebx, 0x1000000
            //   740c                 | je                  0xe
            //   f7df                 | neg                 edi
            //   1bff                 | sbb                 edi, edi

        $sequence_3 = { 83c424 5b c20800 31c0 50 }
            // n = 5, score = 100
            //   83c424               | add                 esp, 0x24
            //   5b                   | pop                 ebx
            //   c20800               | ret                 8
            //   31c0                 | xor                 eax, eax
            //   50                   | push                eax

        $sequence_4 = { 53 ff75fc ff75fc 683c330000 e9???????? 6685ff 7427 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   683c330000           | push                0x333c
            //   e9????????           |                     
            //   6685ff               | test                di, di
            //   7427                 | je                  0x29

        $sequence_5 = { 03f7 83fbff 7473 4b 85db 7f6e 8b7c241c }
            // n = 7, score = 100
            //   03f7                 | add                 esi, edi
            //   83fbff               | cmp                 ebx, -1
            //   7473                 | je                  0x75
            //   4b                   | dec                 ebx
            //   85db                 | test                ebx, ebx
            //   7f6e                 | jg                  0x70
            //   8b7c241c             | mov                 edi, dword ptr [esp + 0x1c]

        $sequence_6 = { 53 6a00 ff35???????? 894514 ff15???????? 8bf8 }
            // n = 6, score = 100
            //   53                   | push                ebx
            //   6a00                 | push                0
            //   ff35????????         |                     
            //   894514               | mov                 dword ptr [ebp + 0x14], eax
            //   ff15????????         |                     
            //   8bf8                 | mov                 edi, eax

        $sequence_7 = { 4e 85ff 75bc 85f6 7416 4e 8910 }
            // n = 7, score = 100
            //   4e                   | dec                 esi
            //   85ff                 | test                edi, edi
            //   75bc                 | jne                 0xffffffbe
            //   85f6                 | test                esi, esi
            //   7416                 | je                  0x18
            //   4e                   | dec                 esi
            //   8910                 | mov                 dword ptr [eax], edx

        $sequence_8 = { 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_9 = { 83c102 894d08 eb09 8b5508 83c201 895508 e9???????? }
            // n = 7, score = 100
            //   83c102               | add                 ecx, 2
            //   894d08               | mov                 dword ptr [ebp + 8], ecx
            //   eb09                 | jmp                 0xb
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   83c201               | add                 edx, 1
            //   895508               | mov                 dword ptr [ebp + 8], edx
            //   e9????????           |                     

    condition:
        7 of them and filesize < 180224
}