rule win_cutwail_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        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.cutwail"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        malpedia_license = "CC BY-NC-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 = { 894510 eb9a 837d1400 7408 }
            // n = 4, score = 100
            //   894510               | mov                 dword ptr [ebp + 0x10], eax
            //   eb9a                 | jmp                 0xffffff9c
            //   837d1400             | cmp                 dword ptr [ebp + 0x14], 0
            //   7408                 | je                  0xa

        $sequence_1 = { 7429 834e20ff 33c0 833f05 0f94c0 }
            // n = 5, score = 100
            //   7429                 | je                  0x2b
            //   834e20ff             | or                  dword ptr [esi + 0x20], 0xffffffff
            //   33c0                 | xor                 eax, eax
            //   833f05               | cmp                 dword ptr [edi], 5
            //   0f94c0               | sete                al

        $sequence_2 = { 8b8decfdffff 51 e8???????? eb0d 6a01 ff15???????? e9???????? }
            // n = 7, score = 100
            //   8b8decfdffff         | mov                 ecx, dword ptr [ebp - 0x214]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   eb0d                 | jmp                 0xf
            //   6a01                 | push                1
            //   ff15????????         |                     
            //   e9????????           |                     

        $sequence_3 = { 83e004 8d440801 6a00 50 e8???????? 8b4e1c 8b5620 }
            // n = 7, score = 100
            //   83e004               | and                 eax, 4
            //   8d440801             | lea                 eax, [eax + ecx + 1]
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b4e1c               | mov                 ecx, dword ptr [esi + 0x1c]
            //   8b5620               | mov                 edx, dword ptr [esi + 0x20]

        $sequence_4 = { 8b5d18 3bdf 7434 e8???????? 680000a000 6a42 }
            // n = 6, score = 100
            //   8b5d18               | mov                 ebx, dword ptr [ebp + 0x18]
            //   3bdf                 | cmp                 ebx, edi
            //   7434                 | je                  0x36
            //   e8????????           |                     
            //   680000a000           | push                0xa00000
            //   6a42                 | push                0x42

        $sequence_5 = { 83c40c 8945fc 8b07 50 }
            // n = 4, score = 100
            //   83c40c               | add                 esp, 0xc
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   50                   | push                eax

        $sequence_6 = { eb30 0fbe7c3d60 8b4570 57 }
            // n = 4, score = 100
            //   eb30                 | jmp                 0x32
            //   0fbe7c3d60           | movsx               edi, byte ptr [ebp + edi + 0x60]
            //   8b4570               | mov                 eax, dword ptr [ebp + 0x70]
            //   57                   | push                edi

        $sequence_7 = { 8b4d14 ff75fc 8901 8d450c 50 56 e8???????? }
            // n = 7, score = 100
            //   8b4d14               | mov                 ecx, dword ptr [ebp + 0x14]
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   8901                 | mov                 dword ptr [ecx], eax
            //   8d450c               | lea                 eax, [ebp + 0xc]
            //   50                   | push                eax
            //   56                   | push                esi
            //   e8????????           |                     

        $sequence_8 = { 39855cfeffff 7633 8b8d5cfeffff 898d68feffff e8???????? }
            // n = 5, score = 100
            //   39855cfeffff         | cmp                 dword ptr [ebp - 0x1a4], eax
            //   7633                 | jbe                 0x35
            //   8b8d5cfeffff         | mov                 ecx, dword ptr [ebp - 0x1a4]
            //   898d68feffff         | mov                 dword ptr [ebp - 0x198], ecx
            //   e8????????           |                     

        $sequence_9 = { 6a50 e8???????? 59 894718 }
            // n = 4, score = 100
            //   6a50                 | push                0x50
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   894718               | mov                 dword ptr [edi + 0x18], eax

        $sequence_10 = { 51 8b5508 52 e8???????? 8945f8 837d1800 7419 }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   52                   | push                edx
            //   e8????????           |                     
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   837d1800             | cmp                 dword ptr [ebp + 0x18], 0
            //   7419                 | je                  0x1b

        $sequence_11 = { 8b9554feffff 895104 8b8550feffff c7400800c02004 6a00 }
            // n = 5, score = 100
            //   8b9554feffff         | mov                 edx, dword ptr [ebp - 0x1ac]
            //   895104               | mov                 dword ptr [ecx + 4], edx
            //   8b8550feffff         | mov                 eax, dword ptr [ebp - 0x1b0]
            //   c7400800c02004       | mov                 dword ptr [eax + 8], 0x420c000
            //   6a00                 | push                0

        $sequence_12 = { 837d0800 745e 837d0c00 7458 c745f800000000 eb09 }
            // n = 6, score = 100
            //   837d0800             | cmp                 dword ptr [ebp + 8], 0
            //   745e                 | je                  0x60
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0
            //   7458                 | je                  0x5a
            //   c745f800000000       | mov                 dword ptr [ebp - 8], 0
            //   eb09                 | jmp                 0xb

        $sequence_13 = { 833900 0f84ba000000 c745f000000000 817df096000000 }
            // n = 4, score = 100
            //   833900               | cmp                 dword ptr [ecx], 0
            //   0f84ba000000         | je                  0xc0
            //   c745f000000000       | mov                 dword ptr [ebp - 0x10], 0
            //   817df096000000       | cmp                 dword ptr [ebp - 0x10], 0x96

        $sequence_14 = { 8b0c8500f62004 51 e8???????? 83c410 }
            // n = 4, score = 100
            //   8b0c8500f62004       | mov                 ecx, dword ptr [eax*4 + 0x420f600]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10

        $sequence_15 = { e8???????? 85c0 59 59 753f 56 8d4db2 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   753f                 | jne                 0x41
            //   56                   | push                esi
            //   8d4db2               | lea                 ecx, [ebp - 0x4e]

    condition:
        7 of them and filesize < 262144
}