rule win_gootkit_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.gootkit."
        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.gootkit"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 23d0 8b45fc 03570c 3bc2 7212 8bd0 }
            // n = 6, score = 1700
            //   23d0                 | and                 edx, eax
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   03570c               | add                 edx, dword ptr [edi + 0xc]
            //   3bc2                 | cmp                 eax, edx
            //   7212                 | jb                  0x14
            //   8bd0                 | mov                 edx, eax

        $sequence_1 = { 837b0400 7502 32c0 5f 5e }
            // n = 5, score = 1700
            //   837b0400             | cmp                 dword ptr [ebx + 4], 0
            //   7502                 | jne                 4
            //   32c0                 | xor                 al, al
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_2 = { 33ff e8???????? 85c0 7466 8b481c 85c9 }
            // n = 6, score = 1700
            //   33ff                 | xor                 edi, edi
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7466                 | je                  0x68
            //   8b481c               | mov                 ecx, dword ptr [eax + 0x1c]
            //   85c9                 | test                ecx, ecx

        $sequence_3 = { 8975f0 e8???????? 8d45fc 33d2 50 6a00 }
            // n = 6, score = 1700
            //   8975f0               | mov                 dword ptr [ebp - 0x10], esi
            //   e8????????           |                     
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   33d2                 | xor                 edx, edx
            //   50                   | push                eax
            //   6a00                 | push                0

        $sequence_4 = { 57 6a10 59 bf???????? c745b47272656e }
            // n = 5, score = 1700
            //   57                   | push                edi
            //   6a10                 | push                0x10
            //   59                   | pop                 ecx
            //   bf????????           |                     
            //   c745b47272656e       | mov                 dword ptr [ebp - 0x4c], 0x6e657272

        $sequence_5 = { 56 ff75f8 ff15???????? 8bd8 85db }
            // n = 5, score = 1700
            //   56                   | push                esi
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   ff15????????         |                     
            //   8bd8                 | mov                 ebx, eax
            //   85db                 | test                ebx, ebx

        $sequence_6 = { 740e 0fbe0431 c1cf0d 03f8 41 }
            // n = 5, score = 1700
            //   740e                 | je                  0x10
            //   0fbe0431             | movsx               eax, byte ptr [ecx + esi]
            //   c1cf0d               | ror                 edi, 0xd
            //   03f8                 | add                 edi, eax
            //   41                   | inc                 ecx

        $sequence_7 = { 6a02 5b 8975f0 e8???????? }
            // n = 4, score = 1700
            //   6a02                 | push                2
            //   5b                   | pop                 ebx
            //   8975f0               | mov                 dword ptr [ebp - 0x10], esi
            //   e8????????           |                     

        $sequence_8 = { 52 50 8b4510 99 52 50 8b450c }
            // n = 7, score = 1400
            //   52                   | push                edx
            //   50                   | push                eax
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   99                   | cdq                 
            //   52                   | push                edx
            //   50                   | push                eax
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]

        $sequence_9 = { f3aa 68???????? ff15???????? 50 }
            // n = 4, score = 1200
            //   f3aa                 | rep stosb           byte ptr es:[edi], al
            //   68????????           |                     
            //   ff15????????         |                     
            //   50                   | push                eax

        $sequence_10 = { 8b7df4 32c0 8b4de4 f3aa }
            // n = 4, score = 1200
            //   8b7df4               | mov                 edi, dword ptr [ebp - 0xc]
            //   32c0                 | xor                 al, al
            //   8b4de4               | mov                 ecx, dword ptr [ebp - 0x1c]
            //   f3aa                 | rep stosb           byte ptr es:[edi], al

        $sequence_11 = { 50 68???????? ff15???????? 85c0 7505 e8???????? }
            // n = 6, score = 1100
            //   50                   | push                eax
            //   68????????           |                     
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7505                 | jne                 7
            //   e8????????           |                     

        $sequence_12 = { 50 e8???????? 83c40c 68fd000000 }
            // n = 4, score = 1100
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   68fd000000           | push                0xfd

        $sequence_13 = { 50 8b4508 8b00 99 52 50 }
            // n = 6, score = 1000
            //   50                   | push                eax
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   99                   | cdq                 
            //   52                   | push                edx
            //   50                   | push                eax

        $sequence_14 = { c705????????01000000 c705????????02000000 8be5 5d }
            // n = 4, score = 900
            //   c705????????01000000     |     
            //   c705????????02000000     |     
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp

        $sequence_15 = { e8???????? 6a0c 6a08 ff15???????? }
            // n = 4, score = 800
            //   e8????????           |                     
            //   6a0c                 | push                0xc
            //   6a08                 | push                8
            //   ff15????????         |                     

        $sequence_16 = { 6808020000 6a00 ff15???????? 50 ff15???????? }
            // n = 5, score = 800
            //   6808020000           | push                0x208
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_17 = { 833d????????00 750a 6a32 ff15???????? }
            // n = 4, score = 800
            //   833d????????00       |                     
            //   750a                 | jne                 0xc
            //   6a32                 | push                0x32
            //   ff15????????         |                     

        $sequence_18 = { 8d45fc 50 6a01 6a01 6a00 6800000002 }
            // n = 6, score = 600
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax
            //   6a01                 | push                1
            //   6a01                 | push                1
            //   6a00                 | push                0
            //   6800000002           | push                0x2000000

        $sequence_19 = { e8???????? 85c0 750c c705????????03000000 }
            // n = 4, score = 500
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   750c                 | jne                 0xe
            //   c705????????03000000     |     

        $sequence_20 = { ffd6 8b0d???????? 5f a3???????? a1???????? 5e }
            // n = 6, score = 300
            //   ffd6                 | call                esi
            //   8b0d????????         |                     
            //   5f                   | pop                 edi
            //   a3????????           |                     
            //   a1????????           |                     
            //   5e                   | pop                 esi

        $sequence_21 = { 8b7df4 85ff 7414 57 8bce e8???????? 56 }
            // n = 7, score = 300
            //   8b7df4               | mov                 edi, dword ptr [ebp - 0xc]
            //   85ff                 | test                edi, edi
            //   7414                 | je                  0x16
            //   57                   | push                edi
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   56                   | push                esi

        $sequence_22 = { 0f104860 0f114750 0f114f60 b801000000 }
            // n = 4, score = 300
            //   0f104860             | movups              xmm1, xmmword ptr [eax + 0x60]
            //   0f114750             | movups              xmmword ptr [edi + 0x50], xmm0
            //   0f114f60             | movups              xmmword ptr [edi + 0x60], xmm1
            //   b801000000           | mov                 eax, 1

        $sequence_23 = { 6a0b 56 ff15???????? 83c420 }
            // n = 4, score = 300
            //   6a0b                 | push                0xb
            //   56                   | push                esi
            //   ff15????????         |                     
            //   83c420               | add                 esp, 0x20

        $sequence_24 = { 0f104850 0f114f50 0f104060 0f114760 8b4070 }
            // n = 5, score = 300
            //   0f104850             | movups              xmm1, xmmword ptr [eax + 0x50]
            //   0f114f50             | movups              xmmword ptr [edi + 0x50], xmm1
            //   0f104060             | movups              xmm0, xmmword ptr [eax + 0x60]
            //   0f114760             | movups              xmmword ptr [edi + 0x60], xmm0
            //   8b4070               | mov                 eax, dword ptr [eax + 0x70]

        $sequence_25 = { 7550 ff15???????? 8bf8 893d???????? }
            // n = 4, score = 300
            //   7550                 | jne                 0x52
            //   ff15????????         |                     
            //   8bf8                 | mov                 edi, eax
            //   893d????????         |                     

        $sequence_26 = { 0f104030 0f114f20 0f104840 0f114730 0f104050 0f114f40 0f104860 }
            // n = 7, score = 300
            //   0f104030             | movups              xmm0, xmmword ptr [eax + 0x30]
            //   0f114f20             | movups              xmmword ptr [edi + 0x20], xmm1
            //   0f104840             | movups              xmm1, xmmword ptr [eax + 0x40]
            //   0f114730             | movups              xmmword ptr [edi + 0x30], xmm0
            //   0f104050             | movups              xmm0, xmmword ptr [eax + 0x50]
            //   0f114f40             | movups              xmmword ptr [edi + 0x40], xmm1
            //   0f104860             | movups              xmm1, xmmword ptr [eax + 0x60]

        $sequence_27 = { 83ec0c ba???????? b9???????? e8???????? 83ec0c }
            // n = 5, score = 300
            //   83ec0c               | sub                 esp, 0xc
            //   ba????????           |                     
            //   b9????????           |                     
            //   e8????????           |                     
            //   83ec0c               | sub                 esp, 0xc

        $sequence_28 = { 0f110f 0f104820 0f114710 0f104030 0f114f20 0f104840 }
            // n = 6, score = 300
            //   0f110f               | movups              xmmword ptr [edi], xmm1
            //   0f104820             | movups              xmm1, xmmword ptr [eax + 0x20]
            //   0f114710             | movups              xmmword ptr [edi + 0x10], xmm0
            //   0f104030             | movups              xmm0, xmmword ptr [eax + 0x30]
            //   0f114f20             | movups              xmmword ptr [edi + 0x20], xmm1
            //   0f104840             | movups              xmm1, xmmword ptr [eax + 0x40]

        $sequence_29 = { 7510 8d4864 ff15???????? ffc3 }
            // n = 4, score = 300
            //   7510                 | jne                 0x12
            //   8d4864               | lea                 ecx, [eax + 0x64]
            //   ff15????????         |                     
            //   ffc3                 | inc                 ebx

        $sequence_30 = { 8d4204 3bc8 7344 2bca 898de4fdffff }
            // n = 5, score = 300
            //   8d4204               | lea                 eax, [edx + 4]
            //   3bc8                 | cmp                 ecx, eax
            //   7344                 | jae                 0x46
            //   2bca                 | sub                 ecx, edx
            //   898de4fdffff         | mov                 dword ptr [ebp - 0x21c], ecx

        $sequence_31 = { 56 ff15???????? 8b4de8 b84d5a0000 663901 }
            // n = 5, score = 300
            //   56                   | push                esi
            //   ff15????????         |                     
            //   8b4de8               | mov                 ecx, dword ptr [ebp - 0x18]
            //   b84d5a0000           | mov                 eax, 0x5a4d
            //   663901               | cmp                 word ptr [ecx], ax

        $sequence_32 = { 8d45e4 6a1c 50 56 ff15???????? }
            // n = 5, score = 300
            //   8d45e4               | lea                 eax, [ebp - 0x1c]
            //   6a1c                 | push                0x1c
            //   50                   | push                eax
            //   56                   | push                esi
            //   ff15????????         |                     

        $sequence_33 = { 750c 807b01ff 7506 807b0225 }
            // n = 4, score = 300
            //   750c                 | jne                 0xe
            //   807b01ff             | cmp                 byte ptr [ebx + 1], 0xff
            //   7506                 | jne                 8
            //   807b0225             | cmp                 byte ptr [ebx + 2], 0x25

        $sequence_34 = { 53 33db e8???????? ff15???????? 8bc8 e8???????? }
            // n = 6, score = 300
            //   53                   | push                ebx
            //   33db                 | xor                 ebx, ebx
            //   e8????????           |                     
            //   ff15????????         |                     
            //   8bc8                 | mov                 ecx, eax
            //   e8????????           |                     

        $sequence_35 = { ff15???????? ffc3 83fb0a 7cd5 33c0 }
            // n = 5, score = 300
            //   ff15????????         |                     
            //   ffc3                 | inc                 ebx
            //   83fb0a               | cmp                 ebx, 0xa
            //   7cd5                 | jl                  0xffffffd7
            //   33c0                 | xor                 eax, eax

    condition:
        7 of them and filesize < 516096
}