rule win_xtunnel_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-08-17"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.xtunnel"
        malpedia_rule_date = "20200817"
        malpedia_hash = "8c895fd01eccb47a6225bcb1a3ba53cbb98644c5"
        malpedia_version = "20200817"
        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 / approach 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 = { 33c0 85ed 0f94c0 85c0 0f8589fdffff }
            // n = 5, score = 1200
            //   33c0                 | xor                 eax, eax
            //   85ed                 | test                ebp, ebp
            //   0f94c0               | sete                al
            //   85c0                 | test                eax, eax
            //   0f8589fdffff         | jne                 0xfffffd8f

        $sequence_1 = { e8???????? 99 b960000000 f7f9 }
            // n = 4, score = 1200
            //   e8????????           |                     
            //   99                   | cdq                 
            //   b960000000           | mov                 ecx, 0x60
            //   f7f9                 | idiv                ecx

        $sequence_2 = { 0f87c3020000 8b4e50 8b4704 83e905 3bc1 7615 6a01 }
            // n = 7, score = 1200
            //   0f87c3020000         | ja                  0x2c9
            //   8b4e50               | mov                 ecx, dword ptr [esi + 0x50]
            //   8b4704               | mov                 eax, dword ptr [edi + 4]
            //   83e905               | sub                 ecx, 5
            //   3bc1                 | cmp                 eax, ecx
            //   7615                 | jbe                 0x17
            //   6a01                 | push                1

        $sequence_3 = { 0f8461010000 83bf28010000ff 0f8431020000 6685c9 }
            // n = 4, score = 1200
            //   0f8461010000         | je                  0x167
            //   83bf28010000ff       | cmp                 dword ptr [edi + 0x128], -1
            //   0f8431020000         | je                  0x237
            //   6685c9               | test                cx, cx

        $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 = { 33c0 85f6 7421 8bcf }
            // n = 4, score = 1200
            //   33c0                 | xor                 eax, eax
            //   85f6                 | test                esi, esi
            //   7421                 | je                  0x23
            //   8bcf                 | mov                 ecx, edi

        $sequence_6 = { 33c0 85db 0f84f9010000 85ed 7416 }
            // n = 5, score = 1200
            //   33c0                 | xor                 eax, eax
            //   85db                 | test                ebx, ebx
            //   0f84f9010000         | je                  0x1ff
            //   85ed                 | test                ebp, ebp
            //   7416                 | je                  0x18

        $sequence_7 = { 33c0 85ff 7413 8d9b00000000 80b404a80100006a }
            // n = 5, score = 1200
            //   33c0                 | xor                 eax, eax
            //   85ff                 | test                edi, edi
            //   7413                 | je                  0x15
            //   8d9b00000000         | lea                 ebx, [ebx]
            //   80b404a80100006a     | xor                 byte ptr [esp + eax + 0x1a8], 0x6a

        $sequence_8 = { 33c0 85ff 740e 90 }
            // n = 4, score = 1200
            //   33c0                 | xor                 eax, eax
            //   85ff                 | test                edi, edi
            //   740e                 | je                  0x10
            //   90                   | nop                 

        $sequence_9 = { 33c0 85ed 0f98c0 eb07 }
            // n = 4, score = 1200
            //   33c0                 | xor                 eax, eax
            //   85ed                 | test                ebp, ebp
            //   0f98c0               | sets                al
            //   eb07                 | jmp                 9

        $sequence_10 = { 85c9 7406 c7010c000000 5e 5d c3 6a00 }
            // n = 7, score = 1100
            //   85c9                 | test                ecx, ecx
            //   7406                 | je                  8
            //   c7010c000000         | mov                 dword ptr [ecx], 0xc
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   6a00                 | push                0

        $sequence_11 = { 894004 8b4624 894008 8b5624 c6421401 8b4624 }
            // n = 6, score = 1000
            //   894004               | mov                 dword ptr [eax + 4], eax
            //   8b4624               | mov                 eax, dword ptr [esi + 0x24]
            //   894008               | mov                 dword ptr [eax + 8], eax
            //   8b5624               | mov                 edx, dword ptr [esi + 0x24]
            //   c6421401             | mov                 byte ptr [edx + 0x14], 1
            //   8b4624               | mov                 eax, dword ptr [esi + 0x24]

        $sequence_12 = { c6401401 8b4e44 c6411501 c645fc04 }
            // n = 4, score = 1000
            //   c6401401             | mov                 byte ptr [eax + 0x14], 1
            //   8b4e44               | mov                 ecx, dword ptr [esi + 0x44]
            //   c6411501             | mov                 byte ptr [ecx + 0x15], 1
            //   c645fc04             | mov                 byte ptr [ebp - 4], 4

        $sequence_13 = { 8b5314 8d0478 8d4802 2bd1 }
            // n = 4, score = 1000
            //   8b5314               | mov                 edx, dword ptr [ebx + 0x14]
            //   8d0478               | lea                 eax, [eax + edi*2]
            //   8d4802               | lea                 ecx, [eax + 2]
            //   2bd1                 | sub                 edx, ecx

        $sequence_14 = { 6689500a 8b510c 89500c 8b5120 895020 8b4910 894810 }
            // n = 7, score = 1000
            //   6689500a             | mov                 word ptr [eax + 0xa], dx
            //   8b510c               | mov                 edx, dword ptr [ecx + 0xc]
            //   89500c               | mov                 dword ptr [eax + 0xc], edx
            //   8b5120               | mov                 edx, dword ptr [ecx + 0x20]
            //   895020               | mov                 dword ptr [eax + 0x20], edx
            //   8b4910               | mov                 ecx, dword ptr [ecx + 0x10]
            //   894810               | mov                 dword ptr [eax + 0x10], ecx

        $sequence_15 = { 50 ff15???????? 8b4310 8b4b14 33ff }
            // n = 5, score = 1000
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b4310               | mov                 eax, dword ptr [ebx + 0x10]
            //   8b4b14               | mov                 ecx, dword ptr [ebx + 0x14]
            //   33ff                 | xor                 edi, edi

        $sequence_16 = { 807e1500 8975f0 74dd 8b4744 894004 }
            // n = 5, score = 1000
            //   807e1500             | cmp                 byte ptr [esi + 0x15], 0
            //   8975f0               | mov                 dword ptr [ebp - 0x10], esi
            //   74dd                 | je                  0xffffffdf
            //   8b4744               | mov                 eax, dword ptr [edi + 0x44]
            //   894004               | mov                 dword ptr [eax + 4], eax

        $sequence_17 = { 8b5b04 53 e8???????? 8d5f20 83c404 895dec }
            // n = 6, score = 1000
            //   8b5b04               | mov                 ebx, dword ptr [ebx + 4]
            //   53                   | push                ebx
            //   e8????????           |                     
            //   8d5f20               | lea                 ebx, [edi + 0x20]
            //   83c404               | add                 esp, 4
            //   895dec               | mov                 dword ptr [ebp - 0x14], ebx

        $sequence_18 = { 89450c 8d45f0 50 6a00 53 }
            // n = 5, score = 1000
            //   89450c               | mov                 dword ptr [ebp + 0xc], eax
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   50                   | push                eax
            //   6a00                 | push                0
            //   53                   | push                ebx

        $sequence_19 = { e8???????? 83c404 8945b0 8b45b4 }
            // n = 4, score = 500
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8945b0               | mov                 dword ptr [ebp - 0x50], eax
            //   8b45b4               | mov                 eax, dword ptr [ebp - 0x4c]

        $sequence_20 = { 8945b0 8b45b4 50 6a00 }
            // n = 4, score = 500
            //   8945b0               | mov                 dword ptr [ebp - 0x50], eax
            //   8b45b4               | mov                 eax, dword ptr [ebp - 0x4c]
            //   50                   | push                eax
            //   6a00                 | push                0

        $sequence_21 = { c68515faffff3b c68516faffff33 c68517faffff14 c68518faffffa7 c68519faffff25 c6851afaffff0a c6851bfaffff14 }
            // n = 7, score = 300
            //   c68515faffff3b       | mov                 byte ptr [ebp - 0x5eb], 0x3b
            //   c68516faffff33       | mov                 byte ptr [ebp - 0x5ea], 0x33
            //   c68517faffff14       | mov                 byte ptr [ebp - 0x5e9], 0x14
            //   c68518faffffa7       | mov                 byte ptr [ebp - 0x5e8], 0xa7
            //   c68519faffff25       | mov                 byte ptr [ebp - 0x5e7], 0x25
            //   c6851afaffff0a       | mov                 byte ptr [ebp - 0x5e6], 0xa
            //   c6851bfaffff14       | mov                 byte ptr [ebp - 0x5e5], 0x14

        $sequence_22 = { 8b4508 8945e8 c645fc02 8b45e8 83c001 }
            // n = 5, score = 300
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   c645fc02             | mov                 byte ptr [ebp - 4], 2
            //   8b45e8               | mov                 eax, dword ptr [ebp - 0x18]
            //   83c001               | add                 eax, 1

        $sequence_23 = { 8901 eb4d 8b45fc 8b08 }
            // n = 4, score = 300
            //   8901                 | mov                 dword ptr [ecx], eax
            //   eb4d                 | jmp                 0x4f
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   8b08                 | mov                 ecx, dword ptr [eax]

    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*)))
}