rule win_koadic_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 68???????? ff35???????? e8???????? 21c0 742b ff35???????? ff35???????? }
            // n = 7, score = 100
            //   68????????           |                     
            //   ff35????????         |                     
            //   e8????????           |                     
            //   21c0                 | and                 eax, eax
            //   742b                 | je                  0x2d
            //   ff35????????         |                     
            //   ff35????????         |                     

        $sequence_1 = { 397004 740d 894108 8b00 85c0 75f2 5e }
            // n = 7, score = 100
            //   397004               | cmp                 dword ptr [eax + 4], esi
            //   740d                 | je                  0xf
            //   894108               | mov                 dword ptr [ecx + 8], eax
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   85c0                 | test                eax, eax
            //   75f2                 | jne                 0xfffffff4
            //   5e                   | pop                 esi

        $sequence_2 = { e8???????? 7573 8b1424 ff35???????? }
            // n = 4, score = 100
            //   e8????????           |                     
            //   7573                 | jne                 0x75
            //   8b1424               | mov                 edx, dword ptr [esp]
            //   ff35????????         |                     

        $sequence_3 = { 85c9 7414 85ff 7410 2bce 90 8a0431 }
            // n = 7, score = 100
            //   85c9                 | test                ecx, ecx
            //   7414                 | je                  0x16
            //   85ff                 | test                edi, edi
            //   7410                 | je                  0x12
            //   2bce                 | sub                 ecx, esi
            //   90                   | nop                 
            //   8a0431               | mov                 al, byte ptr [ecx + esi]

        $sequence_4 = { 53 55 57 80f92d 7507 bf01000000 eb07 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   55                   | push                ebp
            //   57                   | push                edi
            //   80f92d               | cmp                 cl, 0x2d
            //   7507                 | jne                 9
            //   bf01000000           | mov                 edi, 1
            //   eb07                 | jmp                 9

        $sequence_5 = { 8bec 51 51 834dfcff 57 8d4508 50 }
            // n = 7, score = 100
            //   8bec                 | mov                 ebp, esp
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   834dfcff             | or                  dword ptr [ebp - 4], 0xffffffff
            //   57                   | push                edi
            //   8d4508               | lea                 eax, [ebp + 8]
            //   50                   | push                eax

        $sequence_6 = { 8b4508 3b06 7515 6a00 ff75fc ff75fc }
            // n = 6, score = 100
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   3b06                 | cmp                 eax, dword ptr [esi]
            //   7515                 | jne                 0x17
            //   6a00                 | push                0
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff75fc               | push                dword ptr [ebp - 4]

        $sequence_7 = { 8d45d0 50 ff55f4 53 89450c e8???????? 395d0c }
            // n = 7, score = 100
            //   8d45d0               | lea                 eax, [ebp - 0x30]
            //   50                   | push                eax
            //   ff55f4               | call                dword ptr [ebp - 0xc]
            //   53                   | push                ebx
            //   89450c               | mov                 dword ptr [ebp + 0xc], eax
            //   e8????????           |                     
            //   395d0c               | cmp                 dword ptr [ebp + 0xc], ebx

        $sequence_8 = { e8???????? ff35???????? e8???????? 09c0 7410 8b2d???????? }
            // n = 6, score = 100
            //   e8????????           |                     
            //   ff35????????         |                     
            //   e8????????           |                     
            //   09c0                 | or                  eax, eax
            //   7410                 | je                  0x12
            //   8b2d????????         |                     

        $sequence_9 = { 6a00 50 ff15???????? 8bd8 8bd3 895c2420 8bc5 }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8bd8                 | mov                 ebx, eax
            //   8bd3                 | mov                 edx, ebx
            //   895c2420             | mov                 dword ptr [esp + 0x20], ebx
            //   8bc5                 | mov                 eax, ebp

    condition:
        7 of them and filesize < 180224
}