rule win_emdivi_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.emdivi"
        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 = { 8bf1 803e2b 57 8bf8 c645f400 }
            // n = 5, score = 300
            //   8bf1                 | mov                 esi, ecx
            //   803e2b               | cmp                 byte ptr [esi], 0x2b
            //   57                   | push                edi
            //   8bf8                 | mov                 edi, eax
            //   c645f400             | mov                 byte ptr [ebp - 0xc], 0

        $sequence_1 = { 8d8dccfbffff e8???????? 8d85ccfbffff e8???????? f6d8 }
            // n = 5, score = 300
            //   8d8dccfbffff         | lea                 ecx, [ebp - 0x434]
            //   e8????????           |                     
            //   8d85ccfbffff         | lea                 eax, [ebp - 0x434]
            //   e8????????           |                     
            //   f6d8                 | neg                 al

        $sequence_2 = { 53 50 889d04f3ffff e8???????? 83c40c 56 }
            // n = 6, score = 300
            //   53                   | push                ebx
            //   50                   | push                eax
            //   889d04f3ffff         | mov                 byte ptr [ebp - 0xcfc], bl
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   56                   | push                esi

        $sequence_3 = { 897df4 897df8 750d 8078025c }
            // n = 4, score = 300
            //   897df4               | mov                 dword ptr [ebp - 0xc], edi
            //   897df8               | mov                 dword ptr [ebp - 8], edi
            //   750d                 | jne                 0xf
            //   8078025c             | cmp                 byte ptr [eax + 2], 0x5c

        $sequence_4 = { 0f85f7feffff 8b45f8 c60700 5b 5f 5e c9 }
            // n = 7, score = 300
            //   0f85f7feffff         | jne                 0xfffffefd
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   c60700               | mov                 byte ptr [edi], 0
            //   5b                   | pop                 ebx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   c9                   | leave               

        $sequence_5 = { 8b5d10 57 33ff 8078013a 8955ec }
            // n = 5, score = 300
            //   8b5d10               | mov                 ebx, dword ptr [ebp + 0x10]
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   8078013a             | cmp                 byte ptr [eax + 1], 0x3a
            //   8955ec               | mov                 dword ptr [ebp - 0x14], edx

        $sequence_6 = { 8b4df0 8b11 50 51 ff521c }
            // n = 5, score = 300
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   50                   | push                eax
            //   51                   | push                ecx
            //   ff521c               | call                dword ptr [edx + 0x1c]

        $sequence_7 = { 3345fc c1ef03 c1e304 83e203 3355f8 }
            // n = 5, score = 300
            //   3345fc               | xor                 eax, dword ptr [ebp - 4]
            //   c1ef03               | shr                 edi, 3
            //   c1e304               | shl                 ebx, 4
            //   83e203               | and                 edx, 3
            //   3355f8               | xor                 edx, dword ptr [ebp - 8]

        $sequence_8 = { ff750c 8365e000 ff7508 33c0 c645e400 8d7de5 ab }
            // n = 7, score = 300
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   8365e000             | and                 dword ptr [ebp - 0x20], 0
            //   ff7508               | push                dword ptr [ebp + 8]
            //   33c0                 | xor                 eax, eax
            //   c645e400             | mov                 byte ptr [ebp - 0x1c], 0
            //   8d7de5               | lea                 edi, [ebp - 0x1b]
            //   ab                   | stosd               dword ptr es:[edi], eax

        $sequence_9 = { 7513 53 53 6a01 53 }
            // n = 5, score = 300
            //   7513                 | jne                 0x15
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   6a01                 | push                1
            //   53                   | push                ebx

    condition:
        7 of them and filesize < 581632
}