rule win_virut_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.virut."
        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.virut"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 54 6804010000 57 ffb42420020000 }
            // n = 4, score = 200
            //   54                   | push                esp
            //   6804010000           | push                0x104
            //   57                   | push                edi
            //   ffb42420020000       | push                dword ptr [esp + 0x220]

        $sequence_1 = { 8d8424d4000000 50 ff15???????? 6800100000 8d842474050000 50 }
            // n = 6, score = 200
            //   8d8424d4000000       | lea                 eax, [esp + 0xd4]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   6800100000           | push                0x1000
            //   8d842474050000       | lea                 eax, [esp + 0x574]
            //   50                   | push                eax

        $sequence_2 = { ebc2 83c70f 57 8bd4 53 8bcc }
            // n = 6, score = 200
            //   ebc2                 | jmp                 0xffffffc4
            //   83c70f               | add                 edi, 0xf
            //   57                   | push                edi
            //   8bd4                 | mov                 edx, esp
            //   53                   | push                ebx
            //   8bcc                 | mov                 ecx, esp

        $sequence_3 = { 3c7a 7702 2c20 aa 3c5c 74ec }
            // n = 6, score = 200
            //   3c7a                 | cmp                 al, 0x7a
            //   7702                 | ja                  4
            //   2c20                 | sub                 al, 0x20
            //   aa                   | stosb               byte ptr es:[edi], al
            //   3c5c                 | cmp                 al, 0x5c
            //   74ec                 | je                  0xffffffee

        $sequence_4 = { 50 33c9 54 51 50 52 51 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   33c9                 | xor                 ecx, ecx
            //   54                   | push                esp
            //   51                   | push                ecx
            //   50                   | push                eax
            //   52                   | push                edx
            //   51                   | push                ecx

        $sequence_5 = { be???????? 8d7c2424 a5 a5 a4 }
            // n = 5, score = 200
            //   be????????           |                     
            //   8d7c2424             | lea                 edi, [esp + 0x24]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a4                   | movsb               byte ptr es:[edi], byte ptr [esi]

        $sequence_6 = { 85f6 745b 50 54 }
            // n = 4, score = 200
            //   85f6                 | test                esi, esi
            //   745b                 | je                  0x5d
            //   50                   | push                eax
            //   54                   | push                esp

        $sequence_7 = { 8d9704010000 51 51 6a02 }
            // n = 4, score = 200
            //   8d9704010000         | lea                 edx, [edi + 0x104]
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   6a02                 | push                2

        $sequence_8 = { 817c241400000007 0f8cd8fcffff 5f 5e 33c0 5b 8be5 }
            // n = 7, score = 200
            //   817c241400000007     | cmp                 dword ptr [esp + 0x14], 0x7000000
            //   0f8cd8fcffff         | jl                  0xfffffcde
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   33c0                 | xor                 eax, eax
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp

        $sequence_9 = { 59 03f3 8b521c 0fb7044e 03d3 }
            // n = 5, score = 200
            //   59                   | pop                 ecx
            //   03f3                 | add                 esi, ebx
            //   8b521c               | mov                 edx, dword ptr [edx + 0x1c]
            //   0fb7044e             | movzx               eax, word ptr [esi + ecx*2]
            //   03d3                 | add                 edx, ebx

        $sequence_10 = { 3bcf 7e04 8bc7 2bc6 6a00 }
            // n = 5, score = 200
            //   3bcf                 | cmp                 ecx, edi
            //   7e04                 | jle                 6
            //   8bc7                 | mov                 eax, edi
            //   2bc6                 | sub                 eax, esi
            //   6a00                 | push                0

        $sequence_11 = { 8b433c 03c3 8b5078 03d3 8b7220 8b4a18 8d3433 }
            // n = 7, score = 200
            //   8b433c               | mov                 eax, dword ptr [ebx + 0x3c]
            //   03c3                 | add                 eax, ebx
            //   8b5078               | mov                 edx, dword ptr [eax + 0x78]
            //   03d3                 | add                 edx, ebx
            //   8b7220               | mov                 esi, dword ptr [edx + 0x20]
            //   8b4a18               | mov                 ecx, dword ptr [edx + 0x18]
            //   8d3433               | lea                 esi, [ebx + esi]

        $sequence_12 = { 3bf3 0f8e82000000 ff74240c 57 56 ff15???????? 56 }
            // n = 7, score = 200
            //   3bf3                 | cmp                 esi, ebx
            //   0f8e82000000         | jle                 0x88
            //   ff74240c             | push                dword ptr [esp + 0xc]
            //   57                   | push                edi
            //   56                   | push                esi
            //   ff15????????         |                     
            //   56                   | push                esi

        $sequence_13 = { 50 6800040000 8d842404060000 50 }
            // n = 4, score = 200
            //   50                   | push                eax
            //   6800040000           | push                0x400
            //   8d842404060000       | lea                 eax, [esp + 0x604]
            //   50                   | push                eax

        $sequence_14 = { 75b1 ff742418 8b3d???????? ffd7 8d8424d0010000 50 6804010000 }
            // n = 7, score = 200
            //   75b1                 | jne                 0xffffffb3
            //   ff742418             | push                dword ptr [esp + 0x18]
            //   8b3d????????         |                     
            //   ffd7                 | call                edi
            //   8d8424d0010000       | lea                 eax, [esp + 0x1d0]
            //   50                   | push                eax
            //   6804010000           | push                0x104

        $sequence_15 = { 83c004 2bf0 56 8d8404fc050000 50 }
            // n = 5, score = 200
            //   83c004               | add                 eax, 4
            //   2bf0                 | sub                 esi, eax
            //   56                   | push                esi
            //   8d8404fc050000       | lea                 eax, [esp + eax + 0x5fc]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 98304
}