rule win_molerat_loader_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.molerat_loader"
        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 = { 83c40c 68???????? 50 8d8dd0feffff b339 }
            // n = 5, score = 100
            //   83c40c               | add                 esp, 0xc
            //   68????????           |                     
            //   50                   | push                eax
            //   8d8dd0feffff         | lea                 ecx, [ebp - 0x130]
            //   b339                 | mov                 bl, 0x39

        $sequence_1 = { e8???????? 8d4d08 e9???????? 81ff08000c80 753a 68???????? e8???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8d4d08               | lea                 ecx, [ebp + 8]
            //   e9????????           |                     
            //   81ff08000c80         | cmp                 edi, 0x800c0008
            //   753a                 | jne                 0x3c
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_2 = { 50 885dfc e8???????? 83c40c 8d4dd4 }
            // n = 5, score = 100
            //   50                   | push                eax
            //   885dfc               | mov                 byte ptr [ebp - 4], bl
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8d4dd4               | lea                 ecx, [ebp - 0x2c]

        $sequence_3 = { 59 59 80cb01 8bc6 c1f805 8d0c8520924400 8bc6 }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   80cb01               | or                  bl, 1
            //   8bc6                 | mov                 eax, esi
            //   c1f805               | sar                 eax, 5
            //   8d0c8520924400       | lea                 ecx, [eax*4 + 0x449220]
            //   8bc6                 | mov                 eax, esi

        $sequence_4 = { 52 e8???????? 8b00 8b3d???????? 83c40c 6a00 50 }
            // n = 7, score = 100
            //   52                   | push                edx
            //   e8????????           |                     
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   8b3d????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   6a00                 | push                0
            //   50                   | push                eax

        $sequence_5 = { 51 b9???????? e8???????? a1???????? 83c0f0 50 e8???????? }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   b9????????           |                     
            //   e8????????           |                     
            //   a1????????           |                     
            //   83c0f0               | add                 eax, -0x10
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_6 = { 8d55e8 52 e8???????? 68???????? 8d4dec e8???????? 8b45ec }
            // n = 7, score = 100
            //   8d55e8               | lea                 edx, [ebp - 0x18]
            //   52                   | push                edx
            //   e8????????           |                     
            //   68????????           |                     
            //   8d4dec               | lea                 ecx, [ebp - 0x14]
            //   e8????????           |                     
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]

        $sequence_7 = { 7f0a 8b08 8b11 50 8b4204 ffd0 8b8c2410020000 }
            // n = 7, score = 100
            //   7f0a                 | jg                  0xc
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   50                   | push                eax
            //   8b4204               | mov                 eax, dword ptr [edx + 4]
            //   ffd0                 | call                eax
            //   8b8c2410020000       | mov                 ecx, dword ptr [esp + 0x210]

        $sequence_8 = { 68???????? 6a00 ffd6 68???????? 8d4dec e8???????? 8b45ec }
            // n = 7, score = 100
            //   68????????           |                     
            //   6a00                 | push                0
            //   ffd6                 | call                esi
            //   68????????           |                     
            //   8d4dec               | lea                 ecx, [ebp - 0x14]
            //   e8????????           |                     
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]

        $sequence_9 = { e8???????? 8d43f0 c645fc0a 8d480c 83caff f00fc111 4a }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8d43f0               | lea                 eax, [ebx - 0x10]
            //   c645fc0a             | mov                 byte ptr [ebp - 4], 0xa
            //   8d480c               | lea                 ecx, [eax + 0xc]
            //   83caff               | or                  edx, 0xffffffff
            //   f00fc111             | lock xadd           dword ptr [ecx], edx
            //   4a                   | dec                 edx

    condition:
        7 of them and filesize < 688128
}