rule win_virut_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 8d8424c8000000 50 6804010000 ff15???????? 8d8424c8000000 50 }
            // n = 6, score = 200
            //   8d8424c8000000       | lea                 eax, [esp + 0xc8]
            //   50                   | push                eax
            //   6804010000           | push                0x104
            //   ff15????????         |                     
            //   8d8424c8000000       | lea                 eax, [esp + 0xc8]
            //   50                   | push                eax

        $sequence_1 = { 50 50 e8???????? 44 }
            // n = 4, score = 200
            //   50                   | push                eax
            //   50                   | push                eax
            //   e8????????           |                     
            //   44                   | inc                 esp

        $sequence_2 = { ff442414 817c241400000007 0f8cd8fcffff 5f 5e 33c0 5b }
            // n = 7, score = 200
            //   ff442414             | inc                 dword ptr [esp + 0x14]
            //   817c241400000007     | cmp                 dword ptr [esp + 0x14], 0x7000000
            //   0f8cd8fcffff         | jl                  0xfffffcde
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   33c0                 | xor                 eax, eax
            //   5b                   | pop                 ebx

        $sequence_3 = { 60 e8???????? 8b542430 5d }
            // n = 4, score = 200
            //   60                   | pushal              
            //   e8????????           |                     
            //   8b542430             | mov                 edx, dword ptr [esp + 0x30]
            //   5d                   | pop                 ebp

        $sequence_4 = { 8bcb f3a6 61 7405 47 e2f5 ebc2 }
            // n = 7, score = 200
            //   8bcb                 | mov                 ecx, ebx
            //   f3a6                 | repe cmpsb          byte ptr [esi], byte ptr es:[edi]
            //   61                   | popal               
            //   7405                 | je                  7
            //   47                   | inc                 edi
            //   e2f5                 | loop                0xfffffff7
            //   ebc2                 | jmp                 0xffffffc4

        $sequence_5 = { 52 57 6a44 58 8d9704010000 ab }
            // n = 6, score = 200
            //   52                   | push                edx
            //   57                   | push                edi
            //   6a44                 | push                0x44
            //   58                   | pop                 eax
            //   8d9704010000         | lea                 edx, [edi + 0x104]
            //   ab                   | stosd               dword ptr es:[edi], eax

        $sequence_6 = { 8d4704 ab 32e4 ac 66ab }
            // n = 5, score = 200
            //   8d4704               | lea                 eax, [edi + 4]
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   32e4                 | xor                 ah, ah
            //   ac                   | lodsb               al, byte ptr [esi]
            //   66ab                 | stosw               word ptr es:[edi], ax

        $sequence_7 = { 81ec18040000 53 56 57 6a06 }
            // n = 5, score = 200
            //   81ec18040000         | sub                 esp, 0x418
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   6a06                 | push                6

        $sequence_8 = { 85c0 7416 e314 50 8bd4 6a00 52 }
            // n = 7, score = 200
            //   85c0                 | test                eax, eax
            //   7416                 | je                  0x18
            //   e314                 | jecxz               0x16
            //   50                   | push                eax
            //   8bd4                 | mov                 edx, esp
            //   6a00                 | push                0
            //   52                   | push                edx

        $sequence_9 = { 3bf3 0f8e82000000 ff74240c 57 }
            // n = 4, score = 200
            //   3bf3                 | cmp                 esi, ebx
            //   0f8e82000000         | jle                 0x88
            //   ff74240c             | push                dword ptr [esp + 0xc]
            //   57                   | push                edi

        $sequence_10 = { 7e24 8b542414 0fb68c04f8050000 69d26d4ec641 40 }
            // n = 5, score = 200
            //   7e24                 | jle                 0x26
            //   8b542414             | mov                 edx, dword ptr [esp + 0x14]
            //   0fb68c04f8050000     | movzx               ecx, byte ptr [esp + eax + 0x5f8]
            //   69d26d4ec641         | imul                edx, edx, 0x41c64e6d
            //   40                   | inc                 eax

        $sequence_11 = { 0f8441020000 6801040000 8d8424fc050000 53 50 }
            // n = 5, score = 200
            //   0f8441020000         | je                  0x247
            //   6801040000           | push                0x401
            //   8d8424fc050000       | lea                 eax, [esp + 0x5fc]
            //   53                   | push                ebx
            //   50                   | push                eax

        $sequence_12 = { 33f6 85ff 7e2c e8???????? }
            // n = 4, score = 200
            //   33f6                 | xor                 esi, esi
            //   85ff                 | test                edi, edi
            //   7e2c                 | jle                 0x2e
            //   e8????????           |                     

        $sequence_13 = { 6a00 6a05 51 50 53 6a05 }
            // n = 6, score = 200
            //   6a00                 | push                0
            //   6a05                 | push                5
            //   51                   | push                ecx
            //   50                   | push                eax
            //   53                   | push                ebx
            //   6a05                 | push                5

        $sequence_14 = { 03d1 56 ffd2 84c0 }
            // n = 4, score = 200
            //   03d1                 | add                 edx, ecx
            //   56                   | push                esi
            //   ffd2                 | call                edx
            //   84c0                 | test                al, al

        $sequence_15 = { 89442418 3bc3 0f8441020000 6801040000 }
            // n = 4, score = 200
            //   89442418             | mov                 dword ptr [esp + 0x18], eax
            //   3bc3                 | cmp                 eax, ebx
            //   0f8441020000         | je                  0x247
            //   6801040000           | push                0x401

    condition:
        7 of them and filesize < 98304
}