rule win_ismdoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        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 = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 488bcf e8???????? 90 488bc7 4883c440 }
            // n = 5, score = 300
            //   488bcf               | inc                 ecx
            //   e8????????           |                     
            //   90                   | movzx               eax, si
            //   488bc7               | dec                 eax
            //   4883c440             | cmp                 dword ptr [ecx + 0x90], 0

        $sequence_2 = { 83f803 7c58 4533c9 4c8bc3 488d15d4f4ffff 8bce e8???????? }
            // n = 7, score = 300
            //   83f803               | mov                 dword ptr [esp + 0x30], 8
            //   7c58                 | test                eax, eax
            //   4533c9               | cmp                 eax, 3
            //   4c8bc3               | jl                  0x5a
            //   488d15d4f4ffff       | inc                 ebp
            //   8bce                 | xor                 ecx, ecx
            //   e8????????           |                     

        $sequence_3 = { 488b0d???????? e8???????? 488bcb 4883c420 5b 48ffe0 }
            // n = 6, score = 300
            //   488b0d????????       |                     
            //   e8????????           |                     
            //   488bcb               | dec                 esp
            //   4883c420             | mov                 eax, ebx
            //   5b                   | dec                 eax
            //   48ffe0               | lea                 edx, [0xfffff4d4]

        $sequence_4 = { 410fb7c6 e9???????? 4883b99000000000 0f84ac010000 4c8b4118 488d8180000000 }
            // n = 6, score = 300
            //   410fb7c6             | pop                 ebx
            //   e9????????           |                     
            //   4883b99000000000     | dec                 eax
            //   0f84ac010000         | jmp                 eax
            //   4c8b4118             | dec                 eax
            //   488d8180000000       | mov                 ecx, dword ptr [ebp + 0xe0]

        $sequence_5 = { 4883ec20 8b4138 8364243400 488bf9 c744243008000000 85c0 }
            // n = 6, score = 300
            //   4883ec20             | dec                 eax
            //   8b4138               | sub                 esp, 0x20
            //   8364243400           | mov                 eax, dword ptr [ecx + 0x38]
            //   488bf9               | and                 dword ptr [esp + 0x34], 0
            //   c744243008000000     | dec                 eax
            //   85c0                 | mov                 edi, ecx

        $sequence_6 = { c744243000000000 488d0c5b 48c1e106 4803cf 4d8bc4 41be01000000 418bd6 }
            // n = 7, score = 300
            //   c744243000000000     | dec                 eax
            //   488d0c5b             | mov                 dword ptr [ebp + 0xf8], 0xf
            //   48c1e106             | dec                 esp
            //   4803cf               | mov                 dword ptr [ebp + 0xf0], edi
            //   4d8bc4               | mov                 byte ptr [ebp + 0xe0], 0
            //   41be01000000         | dec                 eax
            //   418bd6               | cmp                 dword ptr [ebp - 0x68], 0x10

        $sequence_7 = { 488b8de0000000 e8???????? 48c785f80000000f000000 4c89bdf0000000 c685e000000000 48837d9810 }
            // n = 6, score = 300
            //   488b8de0000000       | mov                 ecx, esi
            //   e8????????           |                     
            //   48c785f80000000f000000     | dec    eax
            //   4c89bdf0000000       | mov                 ecx, ebx
            //   c685e000000000       | dec                 eax
            //   48837d9810           | add                 esp, 0x20

        $sequence_8 = { b8abaaaa2a 8b4c2470 2b4c246c f7e9 895c2410 }
            // n = 5, score = 100
            //   b8abaaaa2a           | mov                 eax, 0x2aaaaaab
            //   8b4c2470             | mov                 ecx, dword ptr [esp + 0x70]
            //   2b4c246c             | sub                 ecx, dword ptr [esp + 0x6c]
            //   f7e9                 | imul                ecx
            //   895c2410             | mov                 dword ptr [esp + 0x10], ebx

        $sequence_9 = { 83f816 731c 83fe08 7d0a 8a80a01e4700 8803 }
            // n = 6, score = 100
            //   83f816               | cmp                 eax, 0x16
            //   731c                 | jae                 0x1e
            //   83fe08               | cmp                 esi, 8
            //   7d0a                 | jge                 0xc
            //   8a80a01e4700         | mov                 al, byte ptr [eax + 0x471ea0]
            //   8803                 | mov                 byte ptr [ebx], al

        $sequence_10 = { 84c0 0f94c0 84c0 0f84e6000000 68???????? }
            // n = 5, score = 100
            //   84c0                 | test                al, al
            //   0f94c0               | sete                al
            //   84c0                 | test                al, al
            //   0f84e6000000         | je                  0xec
            //   68????????           |                     

        $sequence_11 = { 7720 837c246808 89542464 0f43442454 33c9 66890c50 }
            // n = 6, score = 100
            //   7720                 | ja                  0x22
            //   837c246808           | cmp                 dword ptr [esp + 0x68], 8
            //   89542464             | mov                 dword ptr [esp + 0x64], edx
            //   0f43442454           | cmovae              eax, dword ptr [esp + 0x54]
            //   33c9                 | xor                 ecx, ecx
            //   66890c50             | mov                 word ptr [eax + edx*2], cx

        $sequence_12 = { 2bc8 d1f9 85c0 7513 }
            // n = 4, score = 100
            //   2bc8                 | sub                 ecx, eax
            //   d1f9                 | sar                 ecx, 1
            //   85c0                 | test                eax, eax
            //   7513                 | jne                 0x15

        $sequence_13 = { 751c ff7350 ff742420 e8???????? }
            // n = 4, score = 100
            //   751c                 | jne                 0x1e
            //   ff7350               | push                dword ptr [ebx + 0x50]
            //   ff742420             | push                dword ptr [esp + 0x20]
            //   e8????????           |                     

        $sequence_14 = { 8d45f4 64a300000000 8965f0 8bf1 8d45b0 8975a8 }
            // n = 6, score = 100
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   8965f0               | mov                 dword ptr [ebp - 0x10], esp
            //   8bf1                 | mov                 esi, ecx
            //   8d45b0               | lea                 eax, [ebp - 0x50]
            //   8975a8               | mov                 dword ptr [ebp - 0x58], esi

    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
}