rule win_ragnarlocker_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.ragnarlocker"
        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 = { 8bf1 3375e8 2375ac 234de8 8b45d4 }
            // n = 5, score = 300
            //   8bf1                 | mov                 esi, ecx
            //   3375e8               | xor                 esi, dword ptr [ebp - 0x18]
            //   2375ac               | and                 esi, dword ptr [ebp - 0x54]
            //   234de8               | and                 ecx, dword ptr [ebp - 0x18]
            //   8b45d4               | mov                 eax, dword ptr [ebp - 0x2c]

        $sequence_1 = { c1e308 0bd8 0fb64133 0fa4de08 99 0bf2 c1e308 }
            // n = 7, score = 300
            //   c1e308               | shl                 ebx, 8
            //   0bd8                 | or                  ebx, eax
            //   0fb64133             | movzx               eax, byte ptr [ecx + 0x33]
            //   0fa4de08             | shld                esi, ebx, 8
            //   99                   | cdq                 
            //   0bf2                 | or                  esi, edx
            //   c1e308               | shl                 ebx, 8

        $sequence_2 = { 33d2 898508ffffff 8bd9 8b473c 33ff 898504ffffff 8b851cffffff }
            // n = 7, score = 300
            //   33d2                 | xor                 edx, edx
            //   898508ffffff         | mov                 dword ptr [ebp - 0xf8], eax
            //   8bd9                 | mov                 ebx, ecx
            //   8b473c               | mov                 eax, dword ptr [edi + 0x3c]
            //   33ff                 | xor                 edi, edi
            //   898504ffffff         | mov                 dword ptr [ebp - 0xfc], eax
            //   8b851cffffff         | mov                 eax, dword ptr [ebp - 0xe4]

        $sequence_3 = { 8bf1 8b45f4 0fa4c119 c1ee07 c1e019 0bd1 0bf0 }
            // n = 7, score = 300
            //   8bf1                 | mov                 esi, ecx
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   0fa4c119             | shld                ecx, eax, 0x19
            //   c1ee07               | shr                 esi, 7
            //   c1e019               | shl                 eax, 0x19
            //   0bd1                 | or                  edx, ecx
            //   0bf0                 | or                  esi, eax

        $sequence_4 = { 33de 8b75f8 0facd107 33f7 c1ea07 33d9 8b8d58ffffff }
            // n = 7, score = 300
            //   33de                 | xor                 ebx, esi
            //   8b75f8               | mov                 esi, dword ptr [ebp - 8]
            //   0facd107             | shrd                ecx, edx, 7
            //   33f7                 | xor                 esi, edi
            //   c1ea07               | shr                 edx, 7
            //   33d9                 | xor                 ebx, ecx
            //   8b8d58ffffff         | mov                 ecx, dword ptr [ebp - 0xa8]

        $sequence_5 = { 13f7 99 8975b0 8bd8 0fb64151 8bf2 0fa4de08 }
            // n = 7, score = 300
            //   13f7                 | adc                 esi, edi
            //   99                   | cdq                 
            //   8975b0               | mov                 dword ptr [ebp - 0x50], esi
            //   8bd8                 | mov                 ebx, eax
            //   0fb64151             | movzx               eax, byte ptr [ecx + 0x51]
            //   8bf2                 | mov                 esi, edx
            //   0fa4de08             | shld                esi, ebx, 8

        $sequence_6 = { 234de0 2345dc 2375d8 2355ec 33f1 }
            // n = 5, score = 300
            //   234de0               | and                 ecx, dword ptr [ebp - 0x20]
            //   2345dc               | and                 eax, dword ptr [ebp - 0x24]
            //   2375d8               | and                 esi, dword ptr [ebp - 0x28]
            //   2355ec               | and                 edx, dword ptr [ebp - 0x14]
            //   33f1                 | xor                 esi, ecx

        $sequence_7 = { 8bf9 0facd112 c1e70e c1ea12 0bfa 8975fc 8b55f0 }
            // n = 7, score = 300
            //   8bf9                 | mov                 edi, ecx
            //   0facd112             | shrd                ecx, edx, 0x12
            //   c1e70e               | shl                 edi, 0xe
            //   c1ea12               | shr                 edx, 0x12
            //   0bfa                 | or                  edi, edx
            //   8975fc               | mov                 dword ptr [ebp - 4], esi
            //   8b55f0               | mov                 edx, dword ptr [ebp - 0x10]

        $sequence_8 = { 8b55ec 8b4df8 03cf 13de 034860 135864 034d90 }
            // n = 7, score = 300
            //   8b55ec               | mov                 edx, dword ptr [ebp - 0x14]
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   03cf                 | add                 ecx, edi
            //   13de                 | adc                 ebx, esi
            //   034860               | add                 ecx, dword ptr [eax + 0x60]
            //   135864               | adc                 ebx, dword ptr [eax + 0x64]
            //   034d90               | add                 ecx, dword ptr [ebp - 0x70]

        $sequence_9 = { 0bf2 8b55f4 897dd8 8bfa }
            // n = 4, score = 300
            //   0bf2                 | or                  esi, edx
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]
            //   897dd8               | mov                 dword ptr [ebp - 0x28], edi
            //   8bfa                 | mov                 edi, edx

    condition:
        7 of them and filesize < 147456
}