rule win_chches_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.chches"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 8b550c 8b02 8b4014 85c0 7455 }
            // n = 5, score = 200
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   8b02                 | mov                 eax, dword ptr [edx]
            //   8b4014               | mov                 eax, dword ptr [eax + 0x14]
            //   85c0                 | test                eax, eax
            //   7455                 | je                  0x57

        $sequence_1 = { 33c0 5b 8be5 5d c3 8b4360 57 }
            // n = 7, score = 200
            //   33c0                 | xor                 eax, eax
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b4360               | mov                 eax, dword ptr [ebx + 0x60]
            //   57                   | push                edi

        $sequence_2 = { 7579 c745e041637469 c745e476617469 c745e86f6e2069 c745ec73207265 c745f071756972 c745f465642100 }
            // n = 7, score = 200
            //   7579                 | jne                 0x7b
            //   c745e041637469       | mov                 dword ptr [ebp - 0x20], 0x69746341
            //   c745e476617469       | mov                 dword ptr [ebp - 0x1c], 0x69746176
            //   c745e86f6e2069       | mov                 dword ptr [ebp - 0x18], 0x69206e6f
            //   c745ec73207265       | mov                 dword ptr [ebp - 0x14], 0x65722073
            //   c745f071756972       | mov                 dword ptr [ebp - 0x10], 0x72697571
            //   c745f465642100       | mov                 dword ptr [ebp - 0xc], 0x216465

        $sequence_3 = { 55 8bec 81ecc0000000 c68540ffffff31 c68541ffffff0c c68542ffffff23 c68543ffffff53 }
            // n = 7, score = 200
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   81ecc0000000         | sub                 esp, 0xc0
            //   c68540ffffff31       | mov                 byte ptr [ebp - 0xc0], 0x31
            //   c68541ffffff0c       | mov                 byte ptr [ebp - 0xbf], 0xc
            //   c68542ffffff23       | mov                 byte ptr [ebp - 0xbe], 0x23
            //   c68543ffffff53       | mov                 byte ptr [ebp - 0xbd], 0x53

        $sequence_4 = { 8b4e4c 50 ffd1 8903 8b16 8b4a44 8b5108 }
            // n = 7, score = 200
            //   8b4e4c               | mov                 ecx, dword ptr [esi + 0x4c]
            //   50                   | push                eax
            //   ffd1                 | call                ecx
            //   8903                 | mov                 dword ptr [ebx], eax
            //   8b16                 | mov                 edx, dword ptr [esi]
            //   8b4a44               | mov                 ecx, dword ptr [edx + 0x44]
            //   8b5108               | mov                 edx, dword ptr [ecx + 8]

        $sequence_5 = { c6040300 33db eb1c 3bc3 7518 8b09 }
            // n = 6, score = 200
            //   c6040300             | mov                 byte ptr [ebx + eax], 0
            //   33db                 | xor                 ebx, ebx
            //   eb1c                 | jmp                 0x1e
            //   3bc3                 | cmp                 eax, ebx
            //   7518                 | jne                 0x1a
            //   8b09                 | mov                 ecx, dword ptr [ecx]

        $sequence_6 = { 85c0 750c 6a08 ffd2 50 8b4748 ffd0 }
            // n = 7, score = 200
            //   85c0                 | test                eax, eax
            //   750c                 | jne                 0xe
            //   6a08                 | push                8
            //   ffd2                 | call                edx
            //   50                   | push                eax
            //   8b4748               | mov                 eax, dword ptr [edi + 0x48]
            //   ffd0                 | call                eax

        $sequence_7 = { 6a08 ffd2 50 8b4648 ffd0 8b4d08 89443bfc }
            // n = 7, score = 200
            //   6a08                 | push                8
            //   ffd2                 | call                edx
            //   50                   | push                eax
            //   8b4648               | mov                 eax, dword ptr [esi + 0x48]
            //   ffd0                 | call                eax
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   89443bfc             | mov                 dword ptr [ebx + edi - 4], eax

        $sequence_8 = { 8b5120 57 50 8b4668 52 ffd0 }
            // n = 6, score = 200
            //   8b5120               | mov                 edx, dword ptr [ecx + 0x20]
            //   57                   | push                edi
            //   50                   | push                eax
            //   8b4668               | mov                 eax, dword ptr [esi + 0x68]
            //   52                   | push                edx
            //   ffd0                 | call                eax

        $sequence_9 = { 52 8b9684000000 8d45dc 50 51 ffd2 8b45f4 }
            // n = 7, score = 200
            //   52                   | push                edx
            //   8b9684000000         | mov                 edx, dword ptr [esi + 0x84]
            //   8d45dc               | lea                 eax, [ebp - 0x24]
            //   50                   | push                eax
            //   51                   | push                ecx
            //   ffd2                 | call                edx
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]

    condition:
        7 of them and filesize < 122880
}