rule win_xsplus_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.xsplus."
        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.xsplus"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 8b7e20 8b36 66394f18 75f2 }
            // n = 4, score = 400
            //   8b7e20               | mov                 edi, dword ptr [esi + 0x20]
            //   8b36                 | mov                 esi, dword ptr [esi]
            //   66394f18             | cmp                 word ptr [edi + 0x18], cx
            //   75f2                 | jne                 0xfffffff4

        $sequence_1 = { 6800180000 6a00 ff15???????? 8945fc 837dfc00 7502 }
            // n = 6, score = 300
            //   6800180000           | push                0x1800
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   837dfc00             | cmp                 dword ptr [ebp - 4], 0
            //   7502                 | jne                 4

        $sequence_2 = { 68d1870100 8b4d08 51 ff15???????? 50 ff15???????? }
            // n = 6, score = 300
            //   68d1870100           | push                0x187d1
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_3 = { 033485c0d14000 8b45e4 8b00 8906 }
            // n = 4, score = 300
            //   033485c0d14000       | add                 esi, dword ptr [eax*4 + 0x40d1c0]
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   8906                 | mov                 dword ptr [esi], eax

        $sequence_4 = { 7377 8b550c 0355fc 8b4508 0345fc 8a08 880a }
            // n = 7, score = 300
            //   7377                 | jae                 0x79
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   0355fc               | add                 edx, dword ptr [ebp - 4]
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   0345fc               | add                 eax, dword ptr [ebp - 4]
            //   8a08                 | mov                 cl, byte ptr [eax]
            //   880a                 | mov                 byte ptr [edx], cl

        $sequence_5 = { 3955e0 720e 8b45d0 034508 0345fc 3945e0 }
            // n = 6, score = 300
            //   3955e0               | cmp                 dword ptr [ebp - 0x20], edx
            //   720e                 | jb                  0x10
            //   8b45d0               | mov                 eax, dword ptr [ebp - 0x30]
            //   034508               | add                 eax, dword ptr [ebp + 8]
            //   0345fc               | add                 eax, dword ptr [ebp - 4]
            //   3945e0               | cmp                 dword ptr [ebp - 0x20], eax

        $sequence_6 = { 83c40c 8d95fcfeffff 52 ff15???????? }
            // n = 4, score = 300
            //   83c40c               | add                 esp, 0xc
            //   8d95fcfeffff         | lea                 edx, [ebp - 0x104]
            //   52                   | push                edx
            //   ff15????????         |                     

        $sequence_7 = { 6a00 ff15???????? 89859cfeffff 83bd9cfeffff00 7507 33c0 }
            // n = 6, score = 300
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   89859cfeffff         | mov                 dword ptr [ebp - 0x164], eax
            //   83bd9cfeffff00       | cmp                 dword ptr [ebp - 0x164], 0
            //   7507                 | jne                 9
            //   33c0                 | xor                 eax, eax

        $sequence_8 = { e9???????? 6a00 ff15???????? b801000000 e9???????? 8b5510 81e2ffff0000 }
            // n = 7, score = 300
            //   e9????????           |                     
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   b801000000           | mov                 eax, 1
            //   e9????????           |                     
            //   8b5510               | mov                 edx, dword ptr [ebp + 0x10]
            //   81e2ffff0000         | and                 edx, 0xffff

        $sequence_9 = { 40 0084444000a844 40 0023 d18a0688078a 46 }
            // n = 6, score = 300
            //   40                   | inc                 eax
            //   0084444000a844       | add                 byte ptr [esp + eax*2 + 0x44a80040], al
            //   40                   | inc                 eax
            //   0023                 | add                 byte ptr [ebx], ah
            //   d18a0688078a         | ror                 dword ptr [edx - 0x75f877fa], 1
            //   46                   | inc                 esi

        $sequence_10 = { 33c0 8dbdd5feffff f3ab 66ab aa c745d800000000 }
            // n = 6, score = 300
            //   33c0                 | xor                 eax, eax
            //   8dbdd5feffff         | lea                 edi, [ebp - 0x12b]
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   aa                   | stosb               byte ptr es:[edi], al
            //   c745d800000000       | mov                 dword ptr [ebp - 0x28], 0

        $sequence_11 = { 8b45e4 8b4ddc 33d2 668b1441 }
            // n = 4, score = 300
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   8b4ddc               | mov                 ecx, dword ptr [ebp - 0x24]
            //   33d2                 | xor                 edx, edx
            //   668b1441             | mov                 dx, word ptr [ecx + eax*2]

        $sequence_12 = { 034df8 0fbe11 83fa5c 751c 8b45f4 }
            // n = 5, score = 300
            //   034df8               | add                 ecx, dword ptr [ebp - 8]
            //   0fbe11               | movsx               edx, byte ptr [ecx]
            //   83fa5c               | cmp                 edx, 0x5c
            //   751c                 | jne                 0x1e
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]

        $sequence_13 = { 8b45e4 3b45d8 0f8d24010000 8b4de4 8b55f8 }
            // n = 5, score = 300
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   3b45d8               | cmp                 eax, dword ptr [ebp - 0x28]
            //   0f8d24010000         | jge                 0x12a
            //   8b4de4               | mov                 ecx, dword ptr [ebp - 0x1c]
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]

        $sequence_14 = { 83bd98feffff00 7507 33c0 e9???????? 8b8598feffff 50 }
            // n = 6, score = 300
            //   83bd98feffff00       | cmp                 dword ptr [ebp - 0x168], 0
            //   7507                 | jne                 9
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     
            //   8b8598feffff         | mov                 eax, dword ptr [ebp - 0x168]
            //   50                   | push                eax

        $sequence_15 = { 2b4df0 894de8 8b55f8 3b55e8 731e 8b4514 }
            // n = 6, score = 300
            //   2b4df0               | sub                 ecx, dword ptr [ebp - 0x10]
            //   894de8               | mov                 dword ptr [ebp - 0x18], ecx
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   3b55e8               | cmp                 edx, dword ptr [ebp - 0x18]
            //   731e                 | jae                 0x20
            //   8b4514               | mov                 eax, dword ptr [ebp + 0x14]

        $sequence_16 = { ff15???????? 8945d8 c745e000000000 33c9 894de4 894de8 }
            // n = 6, score = 300
            //   ff15????????         |                     
            //   8945d8               | mov                 dword ptr [ebp - 0x28], eax
            //   c745e000000000       | mov                 dword ptr [ebp - 0x20], 0
            //   33c9                 | xor                 ecx, ecx
            //   894de4               | mov                 dword ptr [ebp - 0x1c], ecx
            //   894de8               | mov                 dword ptr [ebp - 0x18], ecx

    condition:
        7 of them and filesize < 597872
}