rule win_ismdoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 83f8ff 7504 32c0 eb05 c0e804 2401 84c0 }
            // n = 7, score = 400
            //   83f8ff               | cmp                 eax, -1
            //   7504                 | jne                 6
            //   32c0                 | xor                 al, al
            //   eb05                 | jmp                 7
            //   c0e804               | shr                 al, 4
            //   2401                 | and                 al, 1
            //   84c0                 | test                al, al

        $sequence_1 = { 48c745d80f000000 4c8965d0 c645c000 48837d5810 7209 488b4d40 e8???????? }
            // n = 7, score = 300
            //   48c745d80f000000     | mov                 ebp, edx
            //   4c8965d0             | dec                 eax
            //   c645c000             | cmp                 ecx, edx
            //   48837d5810           | je                  0xe9
            //   7209                 | dec                 eax
            //   488b4d40             | mov                 dword ptr [esp + 0x30], ebx
            //   e8????????           |                     

        $sequence_2 = { 488d8a10010000 e9???????? 488d8ad0000000 e9???????? 488d8a68010000 e9???????? 488b8a50000000 }
            // n = 7, score = 300
            //   488d8a10010000       | jb                  0x18
            //   e9????????           |                     
            //   488d8ad0000000       | dec                 eax
            //   e9????????           |                     
            //   488d8a68010000       | mov                 ecx, dword ptr [ebp + 0x40]
            //   e9????????           |                     
            //   488b8a50000000       | jb                  0x253

        $sequence_3 = { 498bd6 498bc9 e8???????? 90 488b15???????? 4881c2c0000000 }
            // n = 6, score = 300
            //   498bd6               | jne                 0x32
            //   498bc9               | dec                 ecx
            //   e8????????           |                     
            //   90                   | mov                 edx, esi
            //   488b15????????       |                     
            //   4881c2c0000000       | dec                 ecx

        $sequence_4 = { 0f824d020000 48895d40 488d4530 4883fa10 480f43c1 c6041800 }
            // n = 6, score = 300
            //   0f824d020000         | dec                 eax
            //   48895d40             | mov                 dword ptr [esp + 0x38], edi
            //   488d4530             | dec                 ecx
            //   4883fa10             | lea                 edi, [eax + 0x28]
            //   480f43c1             | dec                 eax
            //   c6041800             | mov                 dword ptr [ebp - 0x28], 0xf

        $sequence_5 = { 498bf0 488bea 483bca 0f84e3000000 48895c2430 48897c2438 498d7828 }
            // n = 7, score = 300
            //   498bf0               | mov                 ecx, ecx
            //   488bea               | nop                 
            //   483bca               | dec                 eax
            //   0f84e3000000         | add                 edx, 0xc0
            //   48895c2430           | dec                 ecx
            //   48897c2438           | mov                 esi, eax
            //   498d7828             | dec                 eax

        $sequence_6 = { e8???????? 488b4f38 488b01 8b5f20 ff5008 8a15???????? 41bc02000000 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   488b4f38             | dec                 esp
            //   488b01               | mov                 dword ptr [ebp - 0x30], esp
            //   8b5f20               | mov                 byte ptr [ebp - 0x40], 0
            //   ff5008               | dec                 eax
            //   8a15????????         |                     
            //   41bc02000000         | cmp                 dword ptr [ebp + 0x58], 0x10

        $sequence_7 = { 488bf8 ff15???????? 85c0 7530 }
            // n = 4, score = 300
            //   488bf8               | dec                 eax
            //   ff15????????         |                     
            //   85c0                 | mov                 edi, eax
            //   7530                 | test                eax, eax

        $sequence_8 = { c645fc04 898688000000 33c0 c7868000000000000000 }
            // n = 4, score = 100
            //   c645fc04             | mov                 byte ptr [ebp - 4], 4
            //   898688000000         | mov                 dword ptr [esi + 0x88], eax
            //   33c0                 | xor                 eax, eax
            //   c7868000000000000000     | mov    dword ptr [esi + 0x80], 0

        $sequence_9 = { dd00 dd5de8 eb2e c745dcc85f4700 }
            // n = 4, score = 100
            //   dd00                 | fld                 qword ptr [eax]
            //   dd5de8               | fstp                qword ptr [ebp - 0x18]
            //   eb2e                 | jmp                 0x30
            //   c745dcc85f4700       | mov                 dword ptr [ebp - 0x24], 0x475fc8

        $sequence_10 = { c68540ffffff00 83bd24ffffff10 720e ffb510ffffff }
            // n = 4, score = 100
            //   c68540ffffff00       | mov                 byte ptr [ebp - 0xc0], 0
            //   83bd24ffffff10       | cmp                 dword ptr [ebp - 0xdc], 0x10
            //   720e                 | jb                  0x10
            //   ffb510ffffff         | push                dword ptr [ebp - 0xf0]

        $sequence_11 = { 6aff 50 56 8d4c2460 c744247407000000 }
            // n = 5, score = 100
            //   6aff                 | push                -1
            //   50                   | push                eax
            //   56                   | push                esi
            //   8d4c2460             | lea                 ecx, [esp + 0x60]
            //   c744247407000000     | mov                 dword ptr [esp + 0x74], 7

        $sequence_12 = { 7d0d 8a441918 888170674800 41 ebe8 8975e4 }
            // n = 6, score = 100
            //   7d0d                 | jge                 0xf
            //   8a441918             | mov                 al, byte ptr [ecx + ebx + 0x18]
            //   888170674800         | mov                 byte ptr [ecx + 0x486770], al
            //   41                   | inc                 ecx
            //   ebe8                 | jmp                 0xffffffea
            //   8975e4               | mov                 dword ptr [ebp - 0x1c], esi

        $sequence_13 = { c645fc0f 8d8d64ffffff e8???????? 83c41c }
            // n = 4, score = 100
            //   c645fc0f             | mov                 byte ptr [ebp - 4], 0xf
            //   8d8d64ffffff         | lea                 ecx, [ebp - 0x9c]
            //   e8????????           |                     
            //   83c41c               | add                 esp, 0x1c

        $sequence_14 = { e8???????? 8d4de4 c645fc00 e8???????? 83c430 ba01000000 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   8d4de4               | lea                 ecx, [ebp - 0x1c]
            //   c645fc00             | mov                 byte ptr [ebp - 4], 0
            //   e8????????           |                     
            //   83c430               | add                 esp, 0x30
            //   ba01000000           | mov                 edx, 1

    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
}