rule win_xsplus_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "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 = { 8b4608 8b7e20 8b36 66394f18 }
            // n = 4, score = 600
            //   8b4608               | mov                 eax, dword ptr [esi + 8]
            //   8b7e20               | mov                 edi, dword ptr [esi + 0x20]
            //   8b36                 | mov                 esi, dword ptr [esi]
            //   66394f18             | cmp                 word ptr [edi + 0x18], cx

        $sequence_1 = { 51 6a00 6a01 8d55e8 52 8d45f0 50 }
            // n = 7, score = 300
            //   51                   | push                ecx
            //   6a00                 | push                0
            //   6a01                 | push                1
            //   8d55e8               | lea                 edx, [ebp - 0x18]
            //   52                   | push                edx
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   50                   | push                eax

        $sequence_2 = { 6a04 8dbd50ffffff 57 6a06 }
            // n = 4, score = 300
            //   6a04                 | push                4
            //   8dbd50ffffff         | lea                 edi, [ebp - 0xb0]
            //   57                   | push                edi
            //   6a06                 | push                6

        $sequence_3 = { ff15???????? 8b85a8feffff 898590feffff 8b8d90feffff 51 }
            // n = 5, score = 300
            //   ff15????????         |                     
            //   8b85a8feffff         | mov                 eax, dword ptr [ebp - 0x158]
            //   898590feffff         | mov                 dword ptr [ebp - 0x170], eax
            //   8b8d90feffff         | mov                 ecx, dword ptr [ebp - 0x170]
            //   51                   | push                ecx

        $sequence_4 = { c3 60 8bb0a0000000 85f6 7438 fc 03f2 }
            // n = 7, score = 300
            //   c3                   | ret                 
            //   60                   | pushal              
            //   8bb0a0000000         | mov                 esi, dword ptr [eax + 0xa0]
            //   85f6                 | test                esi, esi
            //   7438                 | je                  0x3a
            //   fc                   | cld                 
            //   03f2                 | add                 esi, edx

        $sequence_5 = { 85c0 7463 8b4d08 51 ff15???????? 83c404 8985b8fdffff }
            // n = 7, score = 300
            //   85c0                 | test                eax, eax
            //   7463                 | je                  0x65
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   83c404               | add                 esp, 4
            //   8985b8fdffff         | mov                 dword ptr [ebp - 0x248], eax

        $sequence_6 = { eb02 ebc5 8be5 5d c3 }
            // n = 5, score = 300
            //   eb02                 | jmp                 4
            //   ebc5                 | jmp                 0xffffffc7
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 

        $sequence_7 = { 83c408 85c0 0f85f8000000 8b45e4 8b4ddc }
            // n = 5, score = 300
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   0f85f8000000         | jne                 0xfe
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   8b4ddc               | mov                 ecx, dword ptr [ebp - 0x24]

        $sequence_8 = { 8985ecfcffff 83bdecfcffffff 7436 6a00 8d8df8feffff }
            // n = 5, score = 300
            //   8985ecfcffff         | mov                 dword ptr [ebp - 0x314], eax
            //   83bdecfcffffff       | cmp                 dword ptr [ebp - 0x314], -1
            //   7436                 | je                  0x38
            //   6a00                 | push                0
            //   8d8df8feffff         | lea                 ecx, [ebp - 0x108]

        $sequence_9 = { 3d00010000 7d10 8a8c181d010000 888808a74000 40 ebe6 ff35???????? }
            // n = 7, score = 300
            //   3d00010000           | cmp                 eax, 0x100
            //   7d10                 | jge                 0x12
            //   8a8c181d010000       | mov                 cl, byte ptr [eax + ebx + 0x11d]
            //   888808a74000         | mov                 byte ptr [eax + 0x40a708], cl
            //   40                   | inc                 eax
            //   ebe6                 | jmp                 0xffffffe8
            //   ff35????????         |                     

        $sequence_10 = { 7402 ebf9 83ee04 803e63 7510 807e0161 750a }
            // n = 7, score = 300
            //   7402                 | je                  4
            //   ebf9                 | jmp                 0xfffffffb
            //   83ee04               | sub                 esi, 4
            //   803e63               | cmp                 byte ptr [esi], 0x63
            //   7510                 | jne                 0x12
            //   807e0161             | cmp                 byte ptr [esi + 1], 0x61
            //   750a                 | jne                 0xc

        $sequence_11 = { ff5310 6874610000 686e204461 686174696f 68706c6963 }
            // n = 5, score = 300
            //   ff5310               | call                dword ptr [ebx + 0x10]
            //   6874610000           | push                0x6174
            //   686e204461           | push                0x6144206e
            //   686174696f           | push                0x6f697461
            //   68706c6963           | push                0x63696c70

        $sequence_12 = { fd ab ebec 56 e8???????? 7769 6e }
            // n = 7, score = 300
            //   fd                   | std                 
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   ebec                 | jmp                 0xffffffee
            //   56                   | push                esi
            //   e8????????           |                     
            //   7769                 | ja                  0x6b
            //   6e                   | outsb               dx, byte ptr [esi]

        $sequence_13 = { 7428 0fb63e 0fb6c0 eb12 8b45e0 8a800ca84000 08443b1d }
            // n = 7, score = 300
            //   7428                 | je                  0x2a
            //   0fb63e               | movzx               edi, byte ptr [esi]
            //   0fb6c0               | movzx               eax, al
            //   eb12                 | jmp                 0x14
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]
            //   8a800ca84000         | mov                 al, byte ptr [eax + 0x40a80c]
            //   08443b1d             | or                  byte ptr [ebx + edi + 0x1d], al

        $sequence_14 = { 8d8d60faffff 51 8d955cf9ffff 52 8d8564faffff 50 }
            // n = 6, score = 300
            //   8d8d60faffff         | lea                 ecx, [ebp - 0x5a0]
            //   51                   | push                ecx
            //   8d955cf9ffff         | lea                 edx, [ebp - 0x6a4]
            //   52                   | push                edx
            //   8d8564faffff         | lea                 eax, [ebp - 0x59c]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 597872
}