rule win_hardrain_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.hardrain."
        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.hardrain"
        malpedia_rule_date = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 81ec28010000 e8???????? e8???????? 85c0 }
            // n = 4, score = 200
            //   81ec28010000         | sub                 esp, 0x128
            //   e8????????           |                     
            //   e8????????           |                     
            //   85c0                 | test                eax, eax

        $sequence_1 = { c1e803 33c2 d1e8 33c2 }
            // n = 4, score = 200
            //   c1e803               | shr                 eax, 3
            //   33c2                 | xor                 eax, edx
            //   d1e8                 | shr                 eax, 1
            //   33c2                 | xor                 eax, edx

        $sequence_2 = { 55 56 85c0 7463 }
            // n = 4, score = 200
            //   55                   | push                ebp
            //   56                   | push                esi
            //   85c0                 | test                eax, eax
            //   7463                 | je                  0x65

        $sequence_3 = { 83c414 85c0 740a b802000000 5e 83c418 }
            // n = 6, score = 200
            //   83c414               | add                 esp, 0x14
            //   85c0                 | test                eax, eax
            //   740a                 | je                  0xc
            //   b802000000           | mov                 eax, 2
            //   5e                   | pop                 esi
            //   83c418               | add                 esp, 0x18

        $sequence_4 = { ff15???????? 6685c0 0f86a3000000 8b5500 }
            // n = 4, score = 200
            //   ff15????????         |                     
            //   6685c0               | test                ax, ax
            //   0f86a3000000         | jbe                 0xa9
            //   8b5500               | mov                 edx, dword ptr [ebp]

        $sequence_5 = { 7463 8b742414 85f6 745b 8b6c2418 55 6a40 }
            // n = 7, score = 200
            //   7463                 | je                  0x65
            //   8b742414             | mov                 esi, dword ptr [esp + 0x14]
            //   85f6                 | test                esi, esi
            //   745b                 | je                  0x5d
            //   8b6c2418             | mov                 ebp, dword ptr [esp + 0x18]
            //   55                   | push                ebp
            //   6a40                 | push                0x40

        $sequence_6 = { 68b4000000 89442408 894c2414 6a01 8d542418 }
            // n = 5, score = 200
            //   68b4000000           | push                0xb4
            //   89442408             | mov                 dword ptr [esp + 8], eax
            //   894c2414             | mov                 dword ptr [esp + 0x14], ecx
            //   6a01                 | push                1
            //   8d542418             | lea                 edx, dword ptr [esp + 0x18]

        $sequence_7 = { 51 ff15???????? 33c0 81c4540c0000 c3 b803000000 }
            // n = 6, score = 200
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   33c0                 | xor                 eax, eax
            //   81c4540c0000         | add                 esp, 0xc54
            //   c3                   | ret                 
            //   b803000000           | mov                 eax, 3

        $sequence_8 = { 8994242c040000 8b542418 68f0060000 50 51 89942444040000 }
            // n = 6, score = 200
            //   8994242c040000       | mov                 dword ptr [esp + 0x42c], edx
            //   8b542418             | mov                 edx, dword ptr [esp + 0x18]
            //   68f0060000           | push                0x6f0
            //   50                   | push                eax
            //   51                   | push                ecx
            //   89942444040000       | mov                 dword ptr [esp + 0x444], edx

        $sequence_9 = { 6689442422 ff15???????? 8bf0 83feff 0f8493000000 8d442408 50 }
            // n = 7, score = 200
            //   6689442422           | mov                 word ptr [esp + 0x22], ax
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   83feff               | cmp                 esi, -1
            //   0f8493000000         | je                  0x99
            //   8d442408             | lea                 eax, dword ptr [esp + 8]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 368640
}