rule win_confucius_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.confucius."
        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.confucius"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 8bf8 e8???????? 83c438 c686ec02000001 8bc7 5f }
            // n = 7, score = 100
            //   56                   | push                esi
            //   8bf8                 | mov                 edi, eax
            //   e8????????           |                     
            //   83c438               | add                 esp, 0x38
            //   c686ec02000001       | mov                 byte ptr [esi + 0x2ec], 1
            //   8bc7                 | mov                 eax, edi
            //   5f                   | pop                 edi

        $sequence_1 = { 83c444 c3 6a03 53 e8???????? 83c408 89442458 }
            // n = 7, score = 100
            //   83c444               | add                 esp, 0x44
            //   c3                   | ret                 
            //   6a03                 | push                3
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   89442458             | mov                 dword ptr [esp + 0x58], eax

        $sequence_2 = { 56 53 55 e8???????? 83c40c 85c0 0f85da050000 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   53                   | push                ebx
            //   55                   | push                ebp
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax
            //   0f85da050000         | jne                 0x5e0

        $sequence_3 = { 53 53 53 8d45c8 50 ff15???????? ffd6 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   8d45c8               | lea                 eax, [ebp - 0x38]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   ffd6                 | call                esi

        $sequence_4 = { 68???????? ff75fc e8???????? 8345fc08 8bf7 8d7e04 }
            // n = 6, score = 100
            //   68????????           |                     
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   e8????????           |                     
            //   8345fc08             | add                 dword ptr [ebp - 4], 8
            //   8bf7                 | mov                 esi, edi
            //   8d7e04               | lea                 edi, [esi + 4]

        $sequence_5 = { 68c2000000 ff750c ffd7 ff750c ff15???????? 381d???????? 740c }
            // n = 7, score = 100
            //   68c2000000           | push                0xc2
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ffd7                 | call                edi
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ff15????????         |                     
            //   381d????????         |                     
            //   740c                 | je                  0xe

        $sequence_6 = { 68???????? 56 e8???????? 5e c20400 56 8b74240c }
            // n = 7, score = 100
            //   68????????           |                     
            //   56                   | push                esi
            //   e8????????           |                     
            //   5e                   | pop                 esi
            //   c20400               | ret                 4
            //   56                   | push                esi
            //   8b74240c             | mov                 esi, dword ptr [esp + 0xc]

        $sequence_7 = { 740c c645fe01 391d???????? 7503 885dfe 391d???????? 7414 }
            // n = 7, score = 100
            //   740c                 | je                  0xe
            //   c645fe01             | mov                 byte ptr [ebp - 2], 1
            //   391d????????         |                     
            //   7503                 | jne                 5
            //   885dfe               | mov                 byte ptr [ebp - 2], bl
            //   391d????????         |                     
            //   7414                 | je                  0x16

        $sequence_8 = { 50 e8???????? 891d???????? 391d???????? 742d 381d???????? 0f85a0000000 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   891d????????         |                     
            //   391d????????         |                     
            //   742d                 | je                  0x2f
            //   381d????????         |                     
            //   0f85a0000000         | jne                 0xa6

        $sequence_9 = { 5d 5b 83c408 c3 8b4650 c6464e00 85c0 }
            // n = 7, score = 100
            //   5d                   | pop                 ebp
            //   5b                   | pop                 ebx
            //   83c408               | add                 esp, 8
            //   c3                   | ret                 
            //   8b4650               | mov                 eax, dword ptr [esi + 0x50]
            //   c6464e00             | mov                 byte ptr [esi + 0x4e], 0
            //   85c0                 | test                eax, eax

        $sequence_10 = { 52 803a3c 7507 68???????? eb05 68???????? 51 }
            // n = 7, score = 100
            //   52                   | push                edx
            //   803a3c               | cmp                 byte ptr [edx], 0x3c
            //   7507                 | jne                 9
            //   68????????           |                     
            //   eb05                 | jmp                 7
            //   68????????           |                     
            //   51                   | push                ecx

        $sequence_11 = { 5f 5e 5d 5b 81c49c090000 c3 8d9424a8000000 }
            // n = 7, score = 100
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   5b                   | pop                 ebx
            //   81c49c090000         | add                 esp, 0x99c
            //   c3                   | ret                 
            //   8d9424a8000000       | lea                 edx, [esp + 0xa8]

        $sequence_12 = { 6a00 53 e8???????? 8d442420 57 50 8d4c2440 }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   53                   | push                ebx
            //   e8????????           |                     
            //   8d442420             | lea                 eax, [esp + 0x20]
            //   57                   | push                edi
            //   50                   | push                eax
            //   8d4c2440             | lea                 ecx, [esp + 0x40]

        $sequence_13 = { 53 ff7510 57 50 ff15???????? eb12 }
            // n = 6, score = 100
            //   53                   | push                ebx
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   57                   | push                edi
            //   50                   | push                eax
            //   ff15????????         |                     
            //   eb12                 | jmp                 0x14

        $sequence_14 = { 7421 6800040000 57 8d8500f8ffff 50 e8???????? 8d8500f8ffff }
            // n = 7, score = 100
            //   7421                 | je                  0x23
            //   6800040000           | push                0x400
            //   57                   | push                edi
            //   8d8500f8ffff         | lea                 eax, [ebp - 0x800]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d8500f8ffff         | lea                 eax, [ebp - 0x800]

        $sequence_15 = { 6a0f 50 e8???????? 8d4c241c 6a0e 8d942458040000 51 }
            // n = 7, score = 100
            //   6a0f                 | push                0xf
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d4c241c             | lea                 ecx, [esp + 0x1c]
            //   6a0e                 | push                0xe
            //   8d942458040000       | lea                 edx, [esp + 0x458]
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 598016
}