rule win_ismdoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        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 = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 8ac3 eb04 8acb b001 41c704d004000000 ff4624 ff87d0000000 }
            // n = 7, score = 300
            //   8ac3                 | dec                 eax
            //   eb04                 | shl                 esi, 4
            //   8acb                 | dec                 ecx
            //   b001                 | mov                 eax, dword ptr [esp + 0x10]
            //   41c704d004000000     | dec                 eax
            //   ff4624               | cmp                 dword ptr [esi + eax], ebx
            //   ff87d0000000         | je                  0x22

        $sequence_2 = { 740b b901000000 e8???????? cc b802000000 448d400f 8bd0 }
            // n = 7, score = 300
            //   740b                 | lea                 ecx, dword ptr [esp + 0xe8]
            //   b901000000           | dec                 eax
            //   e8????????           |                     
            //   cc                   | lea                 eax, dword ptr [esp + 0xe8]
            //   b802000000           | je                  0xd
            //   448d400f             | mov                 ecx, 1
            //   8bd0                 | int3                

        $sequence_3 = { 498b1c24 48c1e604 498b442410 48391c06 7417 488b440608 }
            // n = 6, score = 300
            //   498b1c24             | mov                 eax, 2
            //   48c1e604             | inc                 esp
            //   498b442410           | lea                 eax, dword ptr [eax + 0xf]
            //   48391c06             | mov                 edx, eax
            //   7417                 | dec                 ecx
            //   488b440608           | mov                 ebx, dword ptr [esp]

        $sequence_4 = { 4533c0 e8???????? 90 488d8c24e8000000 e8???????? 488d8424e8000000 }
            // n = 6, score = 300
            //   4533c0               | inc                 ebp
            //   e8????????           |                     
            //   90                   | xor                 eax, eax
            //   488d8c24e8000000     | nop                 
            //   e8????????           |                     
            //   488d8424e8000000     | dec                 eax

        $sequence_5 = { 0f8530ffffff 48837f1808 7208 488b0f e8???????? }
            // n = 5, score = 300
            //   0f8530ffffff         | inc                 ecx
            //   48837f1808           | mov                 dword ptr [eax + edx*8], 4
            //   7208                 | inc                 dword ptr [esi + 0x24]
            //   488b0f               | inc                 dword ptr [edi + 0xd0]
            //   e8????????           |                     

        $sequence_6 = { 488bd9 418bf0 4c8bea 418bc8 bf01000000 4585c0 }
            // n = 6, score = 300
            //   488bd9               | dec                 eax
            //   418bf0               | mov                 eax, dword ptr [esi + eax + 8]
            //   4c8bea               | mov                 al, bl
            //   418bc8               | jmp                 6
            //   bf01000000           | mov                 cl, bl
            //   4585c0               | mov                 al, 1

        $sequence_7 = { 4c8b3f 488d5528 498bcf e8???????? 85c0 }
            // n = 5, score = 300
            //   4c8b3f               | dec                 eax
            //   488d5528             | mov                 ebx, ecx
            //   498bcf               | inc                 ecx
            //   e8????????           |                     
            //   85c0                 | mov                 esi, eax

        $sequence_8 = { 68???????? e8???????? 83c404 8d8decfeffff }
            // n = 4, score = 100
            //   68????????           |                     
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8d8decfeffff         | lea                 ecx, dword ptr [ebp - 0x114]

        $sequence_9 = { c645fc0b 8d8df8feffff e8???????? 83c404 68???????? 8bd0 }
            // n = 6, score = 100
            //   c645fc0b             | mov                 byte ptr [ebp - 4], 0xb
            //   8d8df8feffff         | lea                 ecx, dword ptr [ebp - 0x108]
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   68????????           |                     
            //   8bd0                 | mov                 edx, eax

        $sequence_10 = { 837ddc00 0f84f1000000 83ec18 c745ec00000000 0f57c0 8965c4 }
            // n = 6, score = 100
            //   837ddc00             | cmp                 dword ptr [ebp - 0x24], 0
            //   0f84f1000000         | je                  0xf7
            //   83ec18               | sub                 esp, 0x18
            //   c745ec00000000       | mov                 dword ptr [ebp - 0x14], 0
            //   0f57c0               | xorps               xmm0, xmm0
            //   8965c4               | mov                 dword ptr [ebp - 0x3c], esp

        $sequence_11 = { 2c30 eb02 2c57 0002 46 }
            // n = 5, score = 100
            //   2c30                 | sub                 al, 0x30
            //   eb02                 | jmp                 4
            //   2c57                 | sub                 al, 0x57
            //   0002                 | add                 byte ptr [edx], al
            //   46                   | inc                 esi

        $sequence_12 = { 6a25 8bf1 ff15???????? 50 }
            // n = 4, score = 100
            //   6a25                 | push                0x25
            //   8bf1                 | mov                 esi, ecx
            //   ff15????????         |                     
            //   50                   | push                eax

        $sequence_13 = { 50 8d8d58ffffff c645b72d e8???????? 83ec08 }
            // n = 5, score = 100
            //   50                   | push                eax
            //   8d8d58ffffff         | lea                 ecx, dword ptr [ebp - 0xa8]
            //   c645b72d             | mov                 byte ptr [ebp - 0x49], 0x2d
            //   e8????????           |                     
            //   83ec08               | sub                 esp, 8

        $sequence_14 = { 68d0070000 8d4c2414 51 68???????? 50 }
            // n = 5, score = 100
            //   68d0070000           | push                0x7d0
            //   8d4c2414             | lea                 ecx, dword ptr [esp + 0x14]
            //   51                   | push                ecx
            //   68????????           |                     
            //   50                   | push                eax

    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
}