rule win_ismdoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-29"
        version = "1"
        description = "Detects win.ismdoor."
        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.ismdoor"
        malpedia_rule_date = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 32c0 eb05 c0e804 2401 84c0 0f94c3 }
            // n = 6, score = 400
            //   32c0                 | xor                 al, al
            //   eb05                 | jmp                 7
            //   c0e804               | shr                 al, 4
            //   2401                 | and                 al, 1
            //   84c0                 | test                al, al
            //   0f94c3               | sete                bl

        $sequence_1 = { e9???????? 488b8a58000000 e9???????? 488b8a40000000 4883c140 e9???????? }
            // n = 6, score = 300
            //   e9????????           |                     
            //   488b8a58000000       | dec                 ebp
            //   e9????????           |                     
            //   488b8a40000000       | lea                 eax, [eax + 0x10]
            //   4883c140             | inc                 ecx
            //   e9????????           |                     

        $sequence_2 = { 488bd0 41b801000000 498bce ffd3 }
            // n = 4, score = 300
            //   488bd0               | mov                 ecx, dword ptr [edx + 0x40]
            //   41b801000000         | dec                 eax
            //   498bce               | add                 ecx, 0x20
            //   ffd3                 | dec                 eax

        $sequence_3 = { c684245801000000 4883bc245001000010 720d 488b8c2438010000 }
            // n = 4, score = 300
            //   c684245801000000     | mov                 dword ptr [eax - 8], eax
            //   4883bc245001000010     | dec    esp
            //   720d                 | cmp                 ecx, esi
            //   488b8c2438010000     | dec                 eax

        $sequence_4 = { e9???????? 488b8a40000000 4883c120 e9???????? 488b8a60000000 }
            // n = 5, score = 300
            //   e9????????           |                     
            //   488b8a40000000       | dec                 ecx
            //   4883c120             | mov                 dword ptr [eax], eax
            //   e9????????           |                     
            //   488b8a60000000       | mov                 eax, dword ptr [ecx + 8]

        $sequence_5 = { 448be0 488d4d00 e8???????? 4c8b6c2460 4585e4 }
            // n = 5, score = 300
            //   448be0               | inc                 esp
            //   488d4d00             | mov                 esp, eax
            //   e8????????           |                     
            //   4c8b6c2460           | dec                 eax
            //   4585e4               | lea                 ecx, [ebp]

        $sequence_6 = { 0f1f440000 0fb701 488d4902 66894411fe }
            // n = 4, score = 300
            //   0f1f440000           | dec                 esp
            //   0fb701               | mov                 ebp, dword ptr [esp + 0x60]
            //   488d4902             | inc                 ebp
            //   66894411fe           | test                esp, esp

        $sequence_7 = { 498900 8b4108 4d8d4010 418940f8 4c3bce }
            // n = 5, score = 300
            //   498900               | nop                 dword ptr [eax + eax]
            //   8b4108               | movzx               eax, word ptr [ecx]
            //   4d8d4010             | dec                 eax
            //   418940f8             | lea                 ecx, [ecx + 2]
            //   4c3bce               | mov                 word ptr [ecx + edx - 2], ax

        $sequence_8 = { 8d4ddc c645fc01 e8???????? 83c430 c645fc04 b8abaaaa2a }
            // n = 6, score = 100
            //   8d4ddc               | lea                 ecx, [ebp - 0x24]
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   e8????????           |                     
            //   83c430               | add                 esp, 0x30
            //   c645fc04             | mov                 byte ptr [ebp - 4], 4
            //   b8abaaaa2a           | mov                 eax, 0x2aaaaaab

        $sequence_9 = { 6aff c7411407000000 c7411000000000 668901 }
            // n = 4, score = 100
            //   6aff                 | push                -1
            //   c7411407000000       | mov                 dword ptr [ecx + 0x14], 7
            //   c7411000000000       | mov                 dword ptr [ecx + 0x10], 0
            //   668901               | mov                 word ptr [ecx], ax

        $sequence_10 = { c700???????? 8d4508 ba???????? 50 }
            // n = 4, score = 100
            //   c700????????         |                     
            //   8d4508               | lea                 eax, [ebp + 8]
            //   ba????????           |                     
            //   50                   | push                eax

        $sequence_11 = { 8bd0 c645fc20 8d8d20feffff e8???????? }
            // n = 4, score = 100
            //   8bd0                 | mov                 edx, eax
            //   c645fc20             | mov                 byte ptr [ebp - 4], 0x20
            //   8d8d20feffff         | lea                 ecx, [ebp - 0x1e0]
            //   e8????????           |                     

        $sequence_12 = { c7855cffffff00000000 c6854cffffff00 6a00 c741140f000000 }
            // n = 4, score = 100
            //   c7855cffffff00000000     | mov    dword ptr [ebp - 0xa4], 0
            //   c6854cffffff00       | mov                 byte ptr [ebp - 0xb4], 0
            //   6a00                 | push                0
            //   c741140f000000       | mov                 dword ptr [ecx + 0x14], 0xf

        $sequence_13 = { e8???????? 8b957cffffff 83c618 3bf7 75eb }
            // n = 5, score = 100
            //   e8????????           |                     
            //   8b957cffffff         | mov                 edx, dword ptr [ebp - 0x84]
            //   83c618               | add                 esi, 0x18
            //   3bf7                 | cmp                 esi, edi
            //   75eb                 | jne                 0xffffffed

        $sequence_14 = { 84db 0f84ea000000 8b4e28 b8abaaaa2a 2b4e24 }
            // n = 5, score = 100
            //   84db                 | test                bl, bl
            //   0f84ea000000         | je                  0xf0
            //   8b4e28               | mov                 ecx, dword ptr [esi + 0x28]
            //   b8abaaaa2a           | mov                 eax, 0x2aaaaaab
            //   2b4e24               | sub                 ecx, dword ptr [esi + 0x24]

    condition:
        7 of them and filesize < 1933312
}

rule win_ismdoor_w0 {
	meta:
        author = "Florian Roth"
        reference = "https://goo.gl/urp4CD"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.ismdoor"
        malpedia_version = "20180301"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
    strings:
        $x1 = "cmd /u /c WMIC /Node:localhost /Namespace:\\\\root\\SecurityCenter" fullword ascii
        $x2 = "cmd /a /c net user administrator /domain >>" fullword ascii
        $x3 = "cmd /a /c netstat -ant >>\"%localappdata%\\Microsoft\\" fullword ascii
        $o1 = "========================== (Net User) ==========================" ascii fullword
    condition:
        1 of them
}