rule win_mailto_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.mailto"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 8bc1 c1e01a 2be8 896c2430 8b6c2428 03e9 8bcd }
            // n = 7, score = 200
            //   8bc1                 | mov                 eax, ecx
            //   c1e01a               | shl                 eax, 0x1a
            //   2be8                 | sub                 ebp, eax
            //   896c2430             | mov                 dword ptr [esp + 0x30], ebp
            //   8b6c2428             | mov                 ebp, dword ptr [esp + 0x28]
            //   03e9                 | add                 ebp, ecx
            //   8bcd                 | mov                 ecx, ebp

        $sequence_1 = { 8928 8b442414 8901 5d 5f 5e 8bc3 }
            // n = 7, score = 200
            //   8928                 | mov                 dword ptr [eax], ebp
            //   8b442414             | mov                 eax, dword ptr [esp + 0x14]
            //   8901                 | mov                 dword ptr [ecx], eax
            //   5d                   | pop                 ebp
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   8bc3                 | mov                 eax, ebx

        $sequence_2 = { e8???????? 8bd0 83c408 85d2 7464 }
            // n = 5, score = 200
            //   e8????????           |                     
            //   8bd0                 | mov                 edx, eax
            //   83c408               | add                 esp, 8
            //   85d2                 | test                edx, edx
            //   7464                 | je                  0x66

        $sequence_3 = { 57 e8???????? 8bf0 83c408 85f6 0f8410feffff 8b4c2418 }
            // n = 7, score = 200
            //   57                   | push                edi
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   83c408               | add                 esp, 8
            //   85f6                 | test                esi, esi
            //   0f8410feffff         | je                  0xfffffe16
            //   8b4c2418             | mov                 ecx, dword ptr [esp + 0x18]

        $sequence_4 = { 50 8d8424d8000000 50 e8???????? 8d8424dc000000 50 8d442448 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   8d8424d8000000       | lea                 eax, [esp + 0xd8]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d8424dc000000       | lea                 eax, [esp + 0xdc]
            //   50                   | push                eax
            //   8d442448             | lea                 eax, [esp + 0x48]

        $sequence_5 = { 56 8b742428 56 8b4034 ffd0 83c408 85c0 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   8b742428             | mov                 esi, dword ptr [esp + 0x28]
            //   56                   | push                esi
            //   8b4034               | mov                 eax, dword ptr [eax + 0x34]
            //   ffd0                 | call                eax
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax

        $sequence_6 = { e8???????? 83c404 5b a1???????? 85c0 }
            // n = 5, score = 200
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   5b                   | pop                 ebx
            //   a1????????           |                     
            //   85c0                 | test                eax, eax

        $sequence_7 = { 56 898188000000 e8???????? 8b0d???????? 6812322281 56 89818c000000 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   898188000000         | mov                 dword ptr [ecx + 0x88], eax
            //   e8????????           |                     
            //   8b0d????????         |                     
            //   6812322281           | push                0x81223212
            //   56                   | push                esi
            //   89818c000000         | mov                 dword ptr [ecx + 0x8c], eax

        $sequence_8 = { e8???????? 83c404 8907 85c0 7458 8b4310 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8907                 | mov                 dword ptr [edi], eax
            //   85c0                 | test                eax, eax
            //   7458                 | je                  0x5a
            //   8b4310               | mov                 eax, dword ptr [ebx + 0x10]

        $sequence_9 = { 0f84aa000000 8944241c 85c9 0f8467ffffff 83c30c f60301 745b }
            // n = 7, score = 200
            //   0f84aa000000         | je                  0xb0
            //   8944241c             | mov                 dword ptr [esp + 0x1c], eax
            //   85c9                 | test                ecx, ecx
            //   0f8467ffffff         | je                  0xffffff6d
            //   83c30c               | add                 ebx, 0xc
            //   f60301               | test                byte ptr [ebx], 1
            //   745b                 | je                  0x5d

    condition:
        7 of them and filesize < 180224
}