rule win_virut_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.virut"
        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 = { 8bc4 6a00 6800000008 6a40 51 52 6a0e }
            // n = 7, score = 200
            //   8bc4                 | mov                 eax, esp
            //   6a00                 | push                0
            //   6800000008           | push                0x8000000
            //   6a40                 | push                0x40
            //   51                   | push                ecx
            //   52                   | push                edx
            //   6a0e                 | push                0xe

        $sequence_1 = { 03f3 8b521c 0fb7044e 03d3 8b3482 }
            // n = 5, score = 200
            //   03f3                 | add                 esi, ebx
            //   8b521c               | mov                 edx, dword ptr [edx + 0x1c]
            //   0fb7044e             | movzx               eax, word ptr [esi + ecx*2]
            //   03d3                 | add                 edx, ebx
            //   8b3482               | mov                 esi, dword ptr [edx + eax*4]

        $sequence_2 = { 83c40c 8d8424d8020000 50 8d8424d4010000 50 56 }
            // n = 6, score = 200
            //   83c40c               | add                 esp, 0xc
            //   8d8424d8020000       | lea                 eax, [esp + 0x2d8]
            //   50                   | push                eax
            //   8d8424d4010000       | lea                 eax, [esp + 0x1d4]
            //   50                   | push                eax
            //   56                   | push                esi

        $sequence_3 = { 8bcc 6a40 6800001000 6a02 52 6a00 }
            // n = 6, score = 200
            //   8bcc                 | mov                 ecx, esp
            //   6a40                 | push                0x40
            //   6800001000           | push                0x100000
            //   6a02                 | push                2
            //   52                   | push                edx
            //   6a00                 | push                0

        $sequence_4 = { 33d2 8bcf 52 f6d9 52 83e103 }
            // n = 6, score = 200
            //   33d2                 | xor                 edx, edx
            //   8bcf                 | mov                 ecx, edi
            //   52                   | push                edx
            //   f6d9                 | neg                 cl
            //   52                   | push                edx
            //   83e103               | and                 ecx, 3

        $sequence_5 = { 83e103 6a40 03f9 57 }
            // n = 4, score = 200
            //   83e103               | and                 ecx, 3
            //   6a40                 | push                0x40
            //   03f9                 | add                 edi, ecx
            //   57                   | push                edi

        $sequence_6 = { 8bf0 3bf3 0f8e82000000 ff74240c 57 56 }
            // n = 6, score = 200
            //   8bf0                 | mov                 esi, eax
            //   3bf3                 | cmp                 esi, ebx
            //   0f8e82000000         | jle                 0x88
            //   ff74240c             | push                dword ptr [esp + 0xc]
            //   57                   | push                edi
            //   56                   | push                esi

        $sequence_7 = { 7506 807f015a 74c7 885c2413 ff742418 ff15???????? 385c2413 }
            // n = 7, score = 200
            //   7506                 | jne                 8
            //   807f015a             | cmp                 byte ptr [edi + 1], 0x5a
            //   74c7                 | je                  0xffffffc9
            //   885c2413             | mov                 byte ptr [esp + 0x13], bl
            //   ff742418             | push                dword ptr [esp + 0x18]
            //   ff15????????         |                     
            //   385c2413             | cmp                 byte ptr [esp + 0x13], bl

        $sequence_8 = { 58 8d9704010000 ab 33c0 }
            // n = 4, score = 200
            //   58                   | pop                 eax
            //   8d9704010000         | lea                 edx, [edi + 0x104]
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   33c0                 | xor                 eax, eax

        $sequence_9 = { ab ab 8d442430 50 8d442444 50 53 }
            // n = 7, score = 200
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   8d442430             | lea                 eax, [esp + 0x30]
            //   50                   | push                eax
            //   8d442444             | lea                 eax, [esp + 0x44]
            //   50                   | push                eax
            //   53                   | push                ebx

        $sequence_10 = { 61 7405 47 e2f5 }
            // n = 4, score = 200
            //   61                   | popal               
            //   7405                 | je                  7
            //   47                   | inc                 edi
            //   e2f5                 | loop                0xfffffff7

        $sequence_11 = { 8d442428 50 8d8424e0020000 50 ff15???????? 83c40c }
            // n = 6, score = 200
            //   8d442428             | lea                 eax, [esp + 0x28]
            //   50                   | push                eax
            //   8d8424e0020000       | lea                 eax, [esp + 0x2e0]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_12 = { ff15???????? 8d8424c8000000 50 53 8d442428 50 }
            // n = 6, score = 200
            //   ff15????????         |                     
            //   8d8424c8000000       | lea                 eax, [esp + 0xc8]
            //   50                   | push                eax
            //   53                   | push                ebx
            //   8d442428             | lea                 eax, [esp + 0x28]
            //   50                   | push                eax

        $sequence_13 = { ffd6 83f8ff 0f8573030000 6800100000 8d442444 50 8d8424d0000000 }
            // n = 7, score = 200
            //   ffd6                 | call                esi
            //   83f8ff               | cmp                 eax, -1
            //   0f8573030000         | jne                 0x379
            //   6800100000           | push                0x1000
            //   8d442444             | lea                 eax, [esp + 0x44]
            //   50                   | push                eax
            //   8d8424d0000000       | lea                 eax, [esp + 0xd0]

        $sequence_14 = { 6a02 ff15???????? 895c2414 6a64 ff15???????? 8b442414 99 }
            // n = 7, score = 200
            //   6a02                 | push                2
            //   ff15????????         |                     
            //   895c2414             | mov                 dword ptr [esp + 0x14], ebx
            //   6a64                 | push                0x64
            //   ff15????????         |                     
            //   8b442414             | mov                 eax, dword ptr [esp + 0x14]
            //   99                   | cdq                 

        $sequence_15 = { 6894000000 5e 2be6 893424 }
            // n = 4, score = 200
            //   6894000000           | push                0x94
            //   5e                   | pop                 esi
            //   2be6                 | sub                 esp, esi
            //   893424               | mov                 dword ptr [esp], esi

    condition:
        7 of them and filesize < 98304
}