rule win_kimsuky_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.kimsuky"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        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 / approach 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 = { 394c2440 8b4370 894c2440 8944243c }
            // n = 4, score = 400
            //   394c2440             | cmp                 dword ptr [esp + 0x40], ecx
            //   8b4370               | mov                 eax, dword ptr [ebx + 0x70]
            //   894c2440             | mov                 dword ptr [esp + 0x40], ecx
            //   8944243c             | mov                 dword ptr [esp + 0x3c], eax

        $sequence_1 = { 3bc8 7379 0fb68394af0100 8bd1 }
            // n = 4, score = 400
            //   3bc8                 | cmp                 ecx, eax
            //   7379                 | jae                 0x7b
            //   0fb68394af0100       | movzx               eax, byte ptr [ebx + 0x1af94]
            //   8bd1                 | mov                 edx, ecx

        $sequence_2 = { 2bca 51 8d85e4f5ffff 50 6a00 }
            // n = 5, score = 400
            //   2bca                 | sub                 ecx, edx
            //   51                   | push                ecx
            //   8d85e4f5ffff         | lea                 eax, [ebp - 0xa1c]
            //   50                   | push                eax
            //   6a00                 | push                0

        $sequence_3 = { ffd7 a3???????? 8d85dcf7ffff 50 53 ffd7 }
            // n = 6, score = 400
            // 
            //   a3????????           |                     
            //   8d85dcf7ffff         | lea                 eax, [ebp - 0x824]
            //   50                   | push                eax
            //   53                   | push                ebx
            //   ffd7                 | call                edi

        $sequence_4 = { c70009000000 e9???????? e8???????? 33db }
            // n = 4, score = 400
            //   c70009000000         | mov                 dword ptr [eax], 9
            //   e9????????           |                     
            //   e8????????           |                     
            //   33db                 | xor                 ebx, ebx

        $sequence_5 = { 0f8712020000 8b4910 83f90b 7643 }
            // n = 4, score = 400
            //   0f8712020000         | ja                  0x218
            //   8b4910               | mov                 ecx, dword ptr [ecx + 0x10]
            //   83f90b               | cmp                 ecx, 0xb
            //   7643                 | jbe                 0x45

        $sequence_6 = { 8b83acaf0100 8b0e ffc8 3bc8 }
            // n = 4, score = 400
            //   8b83acaf0100         | mov                 eax, dword ptr [ebx + 0x1afac]
            //   8b0e                 | mov                 ecx, dword ptr [esi]
            //   ffc8                 | dec                 eax
            //   3bc8                 | cmp                 ecx, eax

        $sequence_7 = { 7503 56 eb18 6a00 6a00 6a00 68???????? }
            // n = 7, score = 400
            //   7503                 | jne                 5
            //   56                   | push                esi
            //   eb18                 | jmp                 0x1a
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   68????????           |                     

        $sequence_8 = { c70016000000 e8???????? b8ffffff7f eb75 }
            // n = 4, score = 400
            //   c70016000000         | mov                 dword ptr [eax], 0x16
            //   e8????????           |                     
            //   b8ffffff7f           | mov                 eax, 0x7fffffff
            //   eb75                 | jmp                 0x77

        $sequence_9 = { 6a00 50 ff15???????? 8d85ecfbffff }
            // n = 4, score = 400
            //   6a00                 | push                0
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8d85ecfbffff         | lea                 eax, [ebp - 0x414]

        $sequence_10 = { ffd6 8bd8 85db 7510 5e }
            // n = 5, score = 400
            //   ffd6                 | call                esi
            //   8bd8                 | mov                 ebx, eax
            //   85db                 | test                ebx, ebx
            //   7510                 | jne                 0x12
            //   5e                   | pop                 esi

        $sequence_11 = { 3bf0 0f82b5000000 03c0 3bc6 }
            // n = 4, score = 400
            //   3bf0                 | cmp                 esi, eax
            //   0f82b5000000         | jb                  0xbb
            //   03c0                 | add                 eax, eax
            //   3bc6                 | cmp                 eax, esi

        $sequence_12 = { ff15???????? 8d85ecfbffff 50 8d85f8feffff 50 8d85f4fdffff }
            // n = 6, score = 400
            //   ff15????????         |                     
            //   8d85ecfbffff         | lea                 eax, [ebp - 0x414]
            //   50                   | push                eax
            //   8d85f8feffff         | lea                 eax, [ebp - 0x108]
            //   50                   | push                eax
            //   8d85f4fdffff         | lea                 eax, [ebp - 0x20c]

        $sequence_13 = { e8???????? 8d95d4f5ffff b9???????? e8???????? }
            // n = 4, score = 400
            //   e8????????           |                     
            //   8d95d4f5ffff         | lea                 edx, [ebp - 0xa2c]
            //   b9????????           |                     
            //   e8????????           |                     

        $sequence_14 = { 83c430 8d95f0fcffff b9???????? e8???????? }
            // n = 4, score = 400
            //   83c430               | add                 esp, 0x30
            //   8d95f0fcffff         | lea                 edx, [ebp - 0x310]
            //   b9????????           |                     
            //   e8????????           |                     

        $sequence_15 = { 66c1e908 880c02 ff07 8b83acaf0100 ffc8 3907 7210 }
            // n = 7, score = 400
            //   66c1e908             | shr                 cx, 8
            //   880c02               | mov                 byte ptr [edx + eax], cl
            //   ff07                 | inc                 dword ptr [edi]
            //   8b83acaf0100         | mov                 eax, dword ptr [ebx + 0x1afac]
            //   ffc8                 | dec                 eax
            //   3907                 | cmp                 dword ptr [edi], eax
            //   7210                 | jb                  0x12

    condition:
        7 of them and filesize < 499712
}