rule win_xtunnel_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.xtunnel."
        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.xtunnel"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 8a0c30 84c9 0f84fc010000 0fb6c9 8d440801 3bc5 72ea }
            // n = 7, score = 1200
            //   8a0c30               | mov                 cl, byte ptr [eax + esi]
            //   84c9                 | test                cl, cl
            //   0f84fc010000         | je                  0x202
            //   0fb6c9               | movzx               ecx, cl
            //   8d440801             | lea                 eax, [eax + ecx + 1]
            //   3bc5                 | cmp                 eax, ebp
            //   72ea                 | jb                  0xffffffec

        $sequence_1 = { 8a442430 8b4f58 888778010000 83c40c c7811c04000001000000 eb6d ba01ff0000 }
            // n = 7, score = 1200
            //   8a442430             | mov                 al, byte ptr [esp + 0x30]
            //   8b4f58               | mov                 ecx, dword ptr [edi + 0x58]
            //   888778010000         | mov                 byte ptr [edi + 0x178], al
            //   83c40c               | add                 esp, 0xc
            //   c7811c04000001000000     | mov    dword ptr [ecx + 0x41c], 1
            //   eb6d                 | jmp                 0x6f
            //   ba01ff0000           | mov                 edx, 0xff01

        $sequence_2 = { 8b7d40 68???????? e8???????? 83c404 8944240c 3bc3 }
            // n = 6, score = 1200
            //   8b7d40               | mov                 edi, dword ptr [ebp + 0x40]
            //   68????????           |                     
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8944240c             | mov                 dword ptr [esp + 0xc], eax
            //   3bc3                 | cmp                 eax, ebx

        $sequence_3 = { 8d5c0302 83c602 89442410 3bdd 7e16 6815060000 68???????? }
            // n = 7, score = 1200
            //   8d5c0302             | lea                 ebx, [ebx + eax + 2]
            //   83c602               | add                 esi, 2
            //   89442410             | mov                 dword ptr [esp + 0x10], eax
            //   3bdd                 | cmp                 ebx, ebp
            //   7e16                 | jle                 0x18
            //   6815060000           | push                0x615
            //   68????????           |                     

        $sequence_4 = { 8b11 83c202 52 e8???????? }
            // n = 4, score = 1200
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   83c202               | add                 edx, 2
            //   52                   | push                edx
            //   e8????????           |                     

        $sequence_5 = { 8a542414 8d5f09 880b 885301 8b7558 68???????? 8d4325 }
            // n = 7, score = 1200
            //   8a542414             | mov                 dl, byte ptr [esp + 0x14]
            //   8d5f09               | lea                 ebx, [edi + 9]
            //   880b                 | mov                 byte ptr [ebx], cl
            //   885301               | mov                 byte ptr [ebx + 1], dl
            //   8b7558               | mov                 esi, dword ptr [ebp + 0x58]
            //   68????????           |                     
            //   8d4325               | lea                 eax, [ebx + 0x25]

        $sequence_6 = { e8???????? 99 b960000000 f7f9 }
            // n = 4, score = 1200
            //   e8????????           |                     
            //   99                   | cdq                 
            //   b960000000           | mov                 ecx, 0x60
            //   f7f9                 | idiv                ecx

        $sequence_7 = { 8a542410 8a442414 8d7702 6a00 8d7e09 c60601 }
            // n = 6, score = 1200
            //   8a542410             | mov                 dl, byte ptr [esp + 0x10]
            //   8a442414             | mov                 al, byte ptr [esp + 0x14]
            //   8d7702               | lea                 esi, [edi + 2]
            //   6a00                 | push                0
            //   8d7e09               | lea                 edi, [esi + 9]
            //   c60601               | mov                 byte ptr [esi], 1

        $sequence_8 = { 8a0b 43 84c9 75f9 2bda 81fbff000000 0f8fb7000000 }
            // n = 7, score = 1200
            //   8a0b                 | mov                 cl, byte ptr [ebx]
            //   43                   | inc                 ebx
            //   84c9                 | test                cl, cl
            //   75f9                 | jne                 0xfffffffb
            //   2bda                 | sub                 ebx, edx
            //   81fbff000000         | cmp                 ebx, 0xff
            //   0f8fb7000000         | jg                  0xbd

        $sequence_9 = { eb6d ba01ff0000 663bda 7522 8b442434 }
            // n = 5, score = 1200
            //   eb6d                 | jmp                 0x6f
            //   ba01ff0000           | mov                 edx, 0xff01
            //   663bda               | cmp                 bx, dx
            //   7522                 | jne                 0x24
            //   8b442434             | mov                 eax, dword ptr [esp + 0x34]

        $sequence_10 = { c7010c000000 5e 5d c3 6a00 }
            // n = 5, score = 1100
            //   c7010c000000         | mov                 dword ptr [ecx], 0xc
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   6a00                 | push                0

        $sequence_11 = { c645fc03 6a18 895e48 e8???????? }
            // n = 4, score = 1000
            //   c645fc03             | mov                 byte ptr [ebp - 4], 3
            //   6a18                 | push                0x18
            //   895e48               | mov                 dword ptr [esi + 0x48], ebx
            //   e8????????           |                     

        $sequence_12 = { 83c404 33c9 8bc6 ba08000000 }
            // n = 4, score = 1000
            //   83c404               | add                 esp, 4
            //   33c9                 | xor                 ecx, ecx
            //   8bc6                 | mov                 eax, esi
            //   ba08000000           | mov                 edx, 8

        $sequence_13 = { 33c5 50 8d45f4 64a300000000 8b7508 33db 6a18 }
            // n = 7, score = 1000
            //   33c5                 | xor                 eax, ebp
            //   50                   | push                eax
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   33db                 | xor                 ebx, ebx
            //   6a18                 | push                0x18

        $sequence_14 = { 8d550c 89750c e8???????? 8918 8d550c 8d4740 }
            // n = 6, score = 1000
            //   8d550c               | lea                 edx, [ebp + 0xc]
            //   89750c               | mov                 dword ptr [ebp + 0xc], esi
            //   e8????????           |                     
            //   8918                 | mov                 dword ptr [eax], ebx
            //   8d550c               | lea                 edx, [ebp + 0xc]
            //   8d4740               | lea                 eax, [edi + 0x40]

        $sequence_15 = { 8b5b04 53 e8???????? 8b4710 }
            // n = 4, score = 1000
            //   8b5b04               | mov                 ebx, dword ptr [ebx + 4]
            //   53                   | push                ebx
            //   e8????????           |                     
            //   8b4710               | mov                 eax, dword ptr [edi + 0x10]

        $sequence_16 = { 52 51 50 e8???????? 834314fe 8b4310 8b4b14 }
            // n = 7, score = 1000
            //   52                   | push                edx
            //   51                   | push                ecx
            //   50                   | push                eax
            //   e8????????           |                     
            //   834314fe             | add                 dword ptr [ebx + 0x14], -2
            //   8b4310               | mov                 eax, dword ptr [ebx + 0x10]
            //   8b4b14               | mov                 ecx, dword ptr [ebx + 0x14]

        $sequence_17 = { 8b7760 85f6 7411 8b06 50 }
            // n = 5, score = 1000
            //   8b7760               | mov                 esi, dword ptr [edi + 0x60]
            //   85f6                 | test                esi, esi
            //   7411                 | je                  0x13
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   50                   | push                eax

        $sequence_18 = { 895020 8b4e10 894810 eb02 }
            // n = 4, score = 1000
            //   895020               | mov                 dword ptr [eax + 0x20], edx
            //   8b4e10               | mov                 ecx, dword ptr [esi + 0x10]
            //   894810               | mov                 dword ptr [eax + 0x10], ecx
            //   eb02                 | jmp                 4

        $sequence_19 = { 83c404 8945b0 8b45b4 50 }
            // n = 4, score = 500
            //   83c404               | add                 esp, 4
            //   8945b0               | mov                 dword ptr [ebp - 0x50], eax
            //   8b45b4               | mov                 eax, dword ptr [ebp - 0x4c]
            //   50                   | push                eax

        $sequence_20 = { c685c5fafffff2 c685c6faffffb3 c685c7faffff12 c685c8faffffbb }
            // n = 4, score = 300
            //   c685c5fafffff2       | mov                 byte ptr [ebp - 0x53b], 0xf2
            //   c685c6faffffb3       | mov                 byte ptr [ebp - 0x53a], 0xb3
            //   c685c7faffff12       | mov                 byte ptr [ebp - 0x539], 0x12
            //   c685c8faffffbb       | mov                 byte ptr [ebp - 0x538], 0xbb

        $sequence_21 = { c685c5f8ffff80 c685c6f8ffffa4 c685c7f8ffff16 c685c8f8ffff8d c685c9f8ffff15 }
            // n = 5, score = 300
            //   c685c5f8ffff80       | mov                 byte ptr [ebp - 0x73b], 0x80
            //   c685c6f8ffffa4       | mov                 byte ptr [ebp - 0x73a], 0xa4
            //   c685c7f8ffff16       | mov                 byte ptr [ebp - 0x739], 0x16
            //   c685c8f8ffff8d       | mov                 byte ptr [ebp - 0x738], 0x8d
            //   c685c9f8ffff15       | mov                 byte ptr [ebp - 0x737], 0x15

        $sequence_22 = { c685c5f9ffff6d c685c6f9ffff81 c685c7f9ffffc2 c685c8f9ffff82 }
            // n = 4, score = 300
            //   c685c5f9ffff6d       | mov                 byte ptr [ebp - 0x63b], 0x6d
            //   c685c6f9ffff81       | mov                 byte ptr [ebp - 0x63a], 0x81
            //   c685c7f9ffffc2       | mov                 byte ptr [ebp - 0x639], 0xc2
            //   c685c8f9ffff82       | mov                 byte ptr [ebp - 0x638], 0x82

        $sequence_23 = { c685c5fbffffbb c685c6fbffffe6 c685c7fbffff36 c685c8fbffffd5 }
            // n = 4, score = 300
            //   c685c5fbffffbb       | mov                 byte ptr [ebp - 0x43b], 0xbb
            //   c685c6fbffffe6       | mov                 byte ptr [ebp - 0x43a], 0xe6
            //   c685c7fbffff36       | mov                 byte ptr [ebp - 0x439], 0x36
            //   c685c8fbffffd5       | mov                 byte ptr [ebp - 0x438], 0xd5

    condition:
        7 of them and filesize < 4634440
}

rule win_xtunnel_w0 {
  meta:
    author = "Claudio Guarnieri"
    source = "https://netzpolitik.org/2015/digital-attack-on-german-parliament-investigative-report-on-the-hack-of-the-left-party-infrastructure-in-bundestag/"
    malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.xtunnel"
        malpedia_version = "20170410"
    malpedia_license = "CC BY-NC-SA 4.0"
    malpedia_sharing = "TLP:WHITE"

  strings:
    $xaps = ":\\PROJECT\\XAPS_"

    $variant11 = "XAPS_OBJECTIVE.dll"
    $variant12 = "start"

    $variant21 = "User-Agent: Mozilla/5.0 (Windows NT 6.3;WOW64; rv:28.0) Gecko/20100101 Firefox/28.0"
    $variant22 = "is you live?"

    $mix1 = "176.31.112.10"
    $mix2 = "error in select, errno %d"
    $mix3 = "no msg"
    $mix4 = "is you live?"
    $mix5 = "127.0.0.1"
    $mix6 = "err %d"
    $mix7 = "i`m wait"
    $mix8 = "hello"
    $mix9 = "OpenSSL 1.0.1e 11 Feb 2013"
    $mix10 = "Xtunnel.exe"

  condition:
    ((uint16(0) == 0x5A4D) or (uint16(0) == 0xCFD0)) and (($xaps) or (all of ($variant1*)) or (all of ($variant2*)) or (6 of ($mix*)))
}