rule win_ismdoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "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 = { eb05 c0e804 2401 84c0 0f94c3 }
            // n = 5, score = 400
            //   eb05                 | jmp                 7
            //   c0e804               | shr                 al, 4
            //   2401                 | and                 al, 1
            //   84c0                 | test                al, al
            //   0f94c3               | sete                bl

        $sequence_1 = { 498bc1 48f7e9 48c1fa05 488bca 48c1e93f }
            // n = 5, score = 300
            //   498bc1               | je                  0x28
            //   48f7e9               | dec                 ebp
            //   48c1fa05             | mov                 eax, esi
            //   488bca               | inc                 ecx
            //   48c1e93f             | cmp                 edi, esi

        $sequence_2 = { 488b16 4903d7 4c896517 4c89651f 48c7451f0f000000 }
            // n = 5, score = 300
            //   488b16               | dec                 eax
            //   4903d7               | mov                 ecx, ebp
            //   4c896517             | dec                 ecx
            //   4c89651f             | mov                 eax, ecx
            //   48c7451f0f000000     | dec                 eax

        $sequence_3 = { 4885c0 7471 4d85f6 7421 4d8bc6 }
            // n = 5, score = 300
            //   4885c0               | je                  0x35
            //   7471                 | dec                 eax
            //   4d85f6               | mov                 dword ptr [esp + 0x28], 0xffffffff
            //   7421                 | dec                 eax
            //   4d8bc6               | mov                 dword ptr [esp + 0x20], ebx

        $sequence_4 = { eb03 482bd0 440fb64e10 41b801000000 488bcb e8???????? }
            // n = 6, score = 300
            //   eb03                 | jae                 0x15
            //   482bd0               | inc                 esp
            //   440fb64e10           | sub                 esi, edi
            //   41b801000000         | dec                 eax
            //   488bcb               | mov                 edx, ebx
            //   e8????????           |                     

        $sequence_5 = { 4c8bbd80000000 4883ffff 7433 48c7442428ffffffff 48895c2420 }
            // n = 5, score = 300
            //   4c8bbd80000000       | cmp                 dword ptr [eax + 4], edx
            //   4883ffff             | dec                 esp
            //   7433                 | mov                 edi, dword ptr [ebp + 0x80]
            //   48c7442428ffffffff     | dec    eax
            //   48895c2420           | cmp                 edi, -1

        $sequence_6 = { 4883fb08 7cf0 eb1b 395004 }
            // n = 4, score = 300
            //   4883fb08             | dec                 eax
            //   7cf0                 | cmp                 ebx, 8
            //   eb1b                 | jl                  0xfffffff2
            //   395004               | jmp                 0x1d

        $sequence_7 = { 413bfe 7313 442bf7 488bd3 488bcd }
            // n = 5, score = 300
            //   413bfe               | dec                 eax
            //   7313                 | test                eax, eax
            //   442bf7               | je                  0x73
            //   488bd3               | dec                 ebp
            //   488bcd               | test                esi, esi

        $sequence_8 = { 7469 a1???????? 85c0 7535 }
            // n = 4, score = 100
            //   7469                 | je                  0x6b
            //   a1????????           |                     
            //   85c0                 | test                eax, eax
            //   7535                 | jne                 0x37

        $sequence_9 = { 57 8b7d08 23c8 394e18 7709 }
            // n = 5, score = 100
            //   57                   | push                edi
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   23c8                 | and                 ecx, eax
            //   394e18               | cmp                 dword ptr [esi + 0x18], ecx
            //   7709                 | ja                  0xb

        $sequence_10 = { 59 83f80a 732f 8a80181e4700 }
            // n = 4, score = 100
            //   59                   | pop                 ecx
            //   83f80a               | cmp                 eax, 0xa
            //   732f                 | jae                 0x31
            //   8a80181e4700         | mov                 al, byte ptr [eax + 0x471e18]

        $sequence_11 = { 8b048528a54800 8064082480 8ac2 8b4d14 }
            // n = 4, score = 100
            //   8b048528a54800       | mov                 eax, dword ptr [eax*4 + 0x48a528]
            //   8064082480           | and                 byte ptr [eax + ecx + 0x24], 0x80
            //   8ac2                 | mov                 al, dl
            //   8b4d14               | mov                 ecx, dword ptr [ebp + 0x14]

        $sequence_12 = { e8???????? 83ec08 c645fc2c 8d4db8 e8???????? 8d8574ffffff }
            // n = 6, score = 100
            //   e8????????           |                     
            //   83ec08               | sub                 esp, 8
            //   c645fc2c             | mov                 byte ptr [ebp - 4], 0x2c
            //   8d4db8               | lea                 ecx, [ebp - 0x48]
            //   e8????????           |                     
            //   8d8574ffffff         | lea                 eax, [ebp - 0x8c]

        $sequence_13 = { e8???????? 8d4dd4 c645fc03 51 8bd0 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   8d4dd4               | lea                 ecx, [ebp - 0x2c]
            //   c645fc03             | mov                 byte ptr [ebp - 4], 3
            //   51                   | push                ecx
            //   8bd0                 | mov                 edx, eax

        $sequence_14 = { 32c9 c645fc31 e8???????? 83c430 c645fc1e }
            // n = 5, score = 100
            //   32c9                 | xor                 cl, cl
            //   c645fc31             | mov                 byte ptr [ebp - 4], 0x31
            //   e8????????           |                     
            //   83c430               | add                 esp, 0x30
            //   c645fc1e             | mov                 byte ptr [ebp - 4], 0x1e

    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
}