rule win_emdivi_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.emdivi."
        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.emdivi"
        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 = { 59 ff75e8 8bfb 56 }
            // n = 4, score = 300
            //   59                   | pop                 ecx
            //   ff75e8               | push                dword ptr [ebp - 0x18]
            //   8bfb                 | mov                 edi, ebx
            //   56                   | push                esi

        $sequence_1 = { 8b4508 53 56 57 6a21 8bf1 8945e4 }
            // n = 7, score = 300
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   6a21                 | push                0x21
            //   8bf1                 | mov                 esi, ecx
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax

        $sequence_2 = { e9???????? 395d08 7404 33c0 eb09 8b45e4 }
            // n = 6, score = 300
            //   e9????????           |                     
            //   395d08               | cmp                 dword ptr [ebp + 8], ebx
            //   7404                 | je                  6
            //   33c0                 | xor                 eax, eax
            //   eb09                 | jmp                 0xb
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]

        $sequence_3 = { 8d4601 50 e8???????? 8bf8 8bc6 }
            // n = 5, score = 300
            //   8d4601               | lea                 eax, [esi + 1]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax
            //   8bc6                 | mov                 eax, esi

        $sequence_4 = { 8d7e44 6a08 5a 8bc7 8d4df4 }
            // n = 5, score = 300
            //   8d7e44               | lea                 edi, [esi + 0x44]
            //   6a08                 | push                8
            //   5a                   | pop                 edx
            //   8bc7                 | mov                 eax, edi
            //   8d4df4               | lea                 ecx, [ebp - 0xc]

        $sequence_5 = { 83ec30 6a00 e8???????? 8945f8 8d45f8 50 }
            // n = 6, score = 300
            //   83ec30               | sub                 esp, 0x30
            //   6a00                 | push                0
            //   e8????????           |                     
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   50                   | push                eax

        $sequence_6 = { 8d7de5 ab ab ab ab 68???????? }
            // n = 6, score = 300
            //   8d7de5               | lea                 edi, [ebp - 0x1b]
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   68????????           |                     

        $sequence_7 = { 50 ffd7 56 8d85ecf8ffff 50 }
            // n = 5, score = 300
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   56                   | push                esi
            //   8d85ecf8ffff         | lea                 eax, [ebp - 0x714]
            //   50                   | push                eax

        $sequence_8 = { 8bfa 83e703 337df8 8b3cbb 337df4 }
            // n = 5, score = 300
            //   8bfa                 | mov                 edi, edx
            //   83e703               | and                 edi, 3
            //   337df8               | xor                 edi, dword ptr [ebp - 8]
            //   8b3cbb               | mov                 edi, dword ptr [ebx + edi*4]
            //   337df4               | xor                 edi, dword ptr [ebp - 0xc]

        $sequence_9 = { 58 6a05 eb05 6a0f 58 6a0a }
            // n = 6, score = 300
            //   58                   | pop                 eax
            //   6a05                 | push                5
            //   eb05                 | jmp                 7
            //   6a0f                 | push                0xf
            //   58                   | pop                 eax
            //   6a0a                 | push                0xa

    condition:
        7 of them and filesize < 581632
}