rule win_chches_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.chches"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 051d051101 8b00 8b402c c3 e8???????? 051d051101 8b00 }
            // n = 7, score = 200
            //   051d051101           | add                 eax, 0x111051d
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   8b402c               | mov                 eax, dword ptr [eax + 0x2c]
            //   c3                   | ret                 
            //   e8????????           |                     
            //   051d051101           | add                 eax, 0x111051d
            //   8b00                 | mov                 eax, dword ptr [eax]

        $sequence_1 = { 7530 e8???????? 8b7f60 8bd8 035df8 85f6 7409 }
            // n = 7, score = 200
            //   7530                 | jne                 0x32
            //   e8????????           |                     
            //   8b7f60               | mov                 edi, dword ptr [edi + 0x60]
            //   8bd8                 | mov                 ebx, eax
            //   035df8               | add                 ebx, dword ptr [ebp - 8]
            //   85f6                 | test                esi, esi
            //   7409                 | je                  0xb

        $sequence_2 = { 8b4a04 894804 8b45f0 5b 85c0 740e 8b5644 }
            // n = 7, score = 200
            //   8b4a04               | mov                 ecx, dword ptr [edx + 4]
            //   894804               | mov                 dword ptr [eax + 4], ecx
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   5b                   | pop                 ebx
            //   85c0                 | test                eax, eax
            //   740e                 | je                  0x10
            //   8b5644               | mov                 edx, dword ptr [esi + 0x44]

        $sequence_3 = { 50 ffd1 8b45f4 5b 5f 5e }
            // n = 6, score = 200
            //   50                   | push                eax
            //   ffd1                 | call                ecx
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   5b                   | pop                 ebx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_4 = { 8b5668 8d0c3f 51 8b4d08 51 50 8945f0 }
            // n = 7, score = 200
            //   8b5668               | mov                 edx, dword ptr [esi + 0x68]
            //   8d0c3f               | lea                 ecx, [edi + edi]
            //   51                   | push                ecx
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   51                   | push                ecx
            //   50                   | push                eax
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax

        $sequence_5 = { 688e267e8b 68f6a1a93a 6871fd0d4b e8???????? 83c450 e8???????? b920b11001 }
            // n = 7, score = 200
            //   688e267e8b           | push                0x8b7e268e
            //   68f6a1a93a           | push                0x3aa9a1f6
            //   6871fd0d4b           | push                0x4b0dfd71
            //   e8????????           |                     
            //   83c450               | add                 esp, 0x50
            //   e8????????           |                     
            //   b920b11001           | mov                 ecx, 0x110b120

        $sequence_6 = { 52 56 ffd0 8903 85c0 7406 c60000 }
            // n = 7, score = 200
            //   52                   | push                edx
            //   56                   | push                esi
            //   ffd0                 | call                eax
            //   8903                 | mov                 dword ptr [ebx], eax
            //   85c0                 | test                eax, eax
            //   7406                 | je                  8
            //   c60000               | mov                 byte ptr [eax], 0

        $sequence_7 = { 56 57 770d e8???????? 83c408 5b 8be5 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   57                   | push                edi
            //   770d                 | ja                  0xf
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp

        $sequence_8 = { 8b475c 6aff 56 ffd0 8b45fc 5f 5e }
            // n = 7, score = 200
            //   8b475c               | mov                 eax, dword ptr [edi + 0x5c]
            //   6aff                 | push                -1
            //   56                   | push                esi
            //   ffd0                 | call                eax
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_9 = { 8b00 3bc3 7410 8b5644 50 53 ffd2 }
            // n = 7, score = 200
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   3bc3                 | cmp                 eax, ebx
            //   7410                 | je                  0x12
            //   8b5644               | mov                 edx, dword ptr [esi + 0x44]
            //   50                   | push                eax
            //   53                   | push                ebx
            //   ffd2                 | call                edx

    condition:
        7 of them and filesize < 122880
}