rule win_hardrain_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.hardrain"
        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 = { 8bce e8???????? 8b4e10 8b560c 8b4608 33ca 33c8 }
            // n = 7, score = 100
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   8b4e10               | mov                 ecx, dword ptr [esi + 0x10]
            //   8b560c               | mov                 edx, dword ptr [esi + 0xc]
            //   8b4608               | mov                 eax, dword ptr [esi + 8]
            //   33ca                 | xor                 ecx, edx
            //   33c8                 | xor                 ecx, eax

        $sequence_1 = { 85c0 7e34 8d542424 52 }
            // n = 4, score = 100
            //   85c0                 | test                eax, eax
            //   7e34                 | jle                 0x36
            //   8d542424             | lea                 edx, [esp + 0x24]
            //   52                   | push                edx

        $sequence_2 = { e8???????? 83c404 85c0 7455 8b4c2404 68???????? 6851520000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   85c0                 | test                eax, eax
            //   7455                 | je                  0x57
            //   8b4c2404             | mov                 ecx, dword ptr [esp + 4]
            //   68????????           |                     
            //   6851520000           | push                0x5251

        $sequence_3 = { 83fe03 775a ff24b5f0453400 8d7d02 b906000000 8db42498000000 f3a5 }
            // n = 7, score = 100
            //   83fe03               | cmp                 esi, 3
            //   775a                 | ja                  0x5c
            //   ff24b5f0453400       | jmp                 dword ptr [esi*4 + 0x3445f0]
            //   8d7d02               | lea                 edi, [ebp + 2]
            //   b906000000           | mov                 ecx, 6
            //   8db42498000000       | lea                 esi, [esp + 0x98]
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]

        $sequence_4 = { 84c9 7518 40 668b00 }
            // n = 4, score = 100
            //   84c9                 | test                cl, cl
            //   7518                 | jne                 0x1a
            //   40                   | inc                 eax
            //   668b00               | mov                 ax, word ptr [eax]

        $sequence_5 = { 8b742408 68b4000000 6a01 8d442410 }
            // n = 4, score = 100
            //   8b742408             | mov                 esi, dword ptr [esp + 8]
            //   68b4000000           | push                0xb4
            //   6a01                 | push                1
            //   8d442410             | lea                 eax, [esp + 0x10]

        $sequence_6 = { 33c0 0fbe84c1e8d33400 c1f804 83f807 8945c4 0f87e9060000 ff24859c5f3400 }
            // n = 7, score = 100
            //   33c0                 | xor                 eax, eax
            //   0fbe84c1e8d33400     | movsx               eax, byte ptr [ecx + eax*8 + 0x34d3e8]
            //   c1f804               | sar                 eax, 4
            //   83f807               | cmp                 eax, 7
            //   8945c4               | mov                 dword ptr [ebp - 0x3c], eax
            //   0f87e9060000         | ja                  0x6ef
            //   ff24859c5f3400       | jmp                 dword ptr [eax*4 + 0x345f9c]

        $sequence_7 = { 3d41030000 7523 68???????? ff15???????? 56 }
            // n = 5, score = 100
            //   3d41030000           | cmp                 eax, 0x341
            //   7523                 | jne                 0x25
            //   68????????           |                     
            //   ff15????????         |                     
            //   56                   | push                esi

        $sequence_8 = { 3b96108c3600 0f851c010000 a1???????? 83f801 0f84e8000000 85c0 750d }
            // n = 7, score = 100
            //   3b96108c3600         | cmp                 edx, dword ptr [esi + 0x368c10]
            //   0f851c010000         | jne                 0x122
            //   a1????????           |                     
            //   83f801               | cmp                 eax, 1
            //   0f84e8000000         | je                  0xee
            //   85c0                 | test                eax, eax
            //   750d                 | jne                 0xf

        $sequence_9 = { 7429 6a02 6a00 6a00 56 }
            // n = 5, score = 100
            //   7429                 | je                  0x2b
            //   6a02                 | push                2
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   56                   | push                esi

    condition:
        7 of them and filesize < 368640
}