rule win_faketc_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-08-17"
        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.faketc"
        malpedia_rule_date = "20200817"
        malpedia_hash = "8c895fd01eccb47a6225bcb1a3ba53cbb98644c5"
        malpedia_version = "20200817"
        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 = { f3ab a1???????? 33c5 8945fc 8d45df 50 8d4de8 }
            // n = 7, score = 100
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   a1????????           |                     
            //   33c5                 | xor                 eax, ebp
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8d45df               | lea                 eax, [ebp - 0x21]
            //   50                   | push                eax
            //   8d4de8               | lea                 ecx, [ebp - 0x18]

        $sequence_1 = { ff15???????? 8d942458020000 52 e8???????? 8b8c24240b0000 5f 5e }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   8d942458020000       | lea                 edx, [esp + 0x258]
            //   52                   | push                edx
            //   e8????????           |                     
            //   8b8c24240b0000       | mov                 ecx, dword ptr [esp + 0xb24]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_2 = { ffd6 8b44241c 40 6a01 50 e8???????? 83c408 }
            // n = 7, score = 100
            //   ffd6                 | call                esi
            //   8b44241c             | mov                 eax, dword ptr [esp + 0x1c]
            //   40                   | inc                 eax
            //   6a01                 | push                1
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c408               | add                 esp, 8

        $sequence_3 = { 8bd7 e8???????? 894610 8bc3 8b5d0c e8???????? 8b450c }
            // n = 7, score = 100
            //   8bd7                 | mov                 edx, edi
            //   e8????????           |                     
            //   894610               | mov                 dword ptr [esi + 0x10], eax
            //   8bc3                 | mov                 eax, ebx
            //   8b5d0c               | mov                 ebx, dword ptr [ebp + 0xc]
            //   e8????????           |                     
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]

        $sequence_4 = { 8bf4 8b55f8 52 ff15???????? 83c404 3bf4 e8???????? }
            // n = 7, score = 100
            //   8bf4                 | mov                 esi, esp
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   52                   | push                edx
            //   ff15????????         |                     
            //   83c404               | add                 esp, 4
            //   3bf4                 | cmp                 esi, esp
            //   e8????????           |                     

        $sequence_5 = { ffd6 83c40c b8???????? 50 686f9c0000 6a00 53 }
            // n = 7, score = 100
            //   ffd6                 | call                esi
            //   83c40c               | add                 esp, 0xc
            //   b8????????           |                     
            //   50                   | push                eax
            //   686f9c0000           | push                0x9c6f
            //   6a00                 | push                0
            //   53                   | push                ebx

        $sequence_6 = { e8???????? 83c40c 8b4de0 51 68???????? 8b55ec 52 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8b4de0               | mov                 ecx, dword ptr [ebp - 0x20]
            //   51                   | push                ecx
            //   68????????           |                     
            //   8b55ec               | mov                 edx, dword ptr [ebp - 0x14]
            //   52                   | push                edx

        $sequence_7 = { f3ab a1???????? 33c5 8945fc 8b4518 8b4d1c 8b948154010000 }
            // n = 7, score = 100
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   a1????????           |                     
            //   33c5                 | xor                 eax, ebp
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8b4518               | mov                 eax, dword ptr [ebp + 0x18]
            //   8b4d1c               | mov                 ecx, dword ptr [ebp + 0x1c]
            //   8b948154010000       | mov                 edx, dword ptr [ecx + eax*4 + 0x154]

        $sequence_8 = { ff15???????? 5f 5e 8be5 5d c3 68ef030000 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   68ef030000           | push                0x3ef

        $sequence_9 = { d9e0 dec1 dd9d68c5ffff e8???????? 8985b0c4ffff 8bc2 81e2ffffff7f }
            // n = 7, score = 100
            //   d9e0                 | fchs                
            //   dec1                 | faddp               st(1)
            //   dd9d68c5ffff         | fstp                qword ptr [ebp - 0x3a98]
            //   e8????????           |                     
            //   8985b0c4ffff         | mov                 dword ptr [ebp - 0x3b50], eax
            //   8bc2                 | mov                 eax, edx
            //   81e2ffffff7f         | and                 edx, 0x7fffffff

    condition:
        7 of them and filesize < 6864896
}