rule win_xpertrat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.xpertrat."
        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.xpertrat"
        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 = { ff0468 ff0a 250004003c 6c }
            // n = 4, score = 200
            //   ff0468               | inc                 dword ptr [eax + ebp*2]
            //   ff0a                 | dec                 dword ptr [edx]
            //   250004003c           | and                 eax, 0x3c000400
            //   6c                   | insb                byte ptr es:[edi], dx

        $sequence_1 = { 0d80000700 0474 ff0478 ff05???????? 000d???????? 0878ff 0d98000700 }
            // n = 7, score = 200
            //   0d80000700           | or                  eax, 0x70080
            //   0474                 | add                 al, 0x74
            //   ff0478               | inc                 dword ptr [eax + edi*2]
            //   ff05????????         |                     
            //   000d????????         |                     
            //   0878ff               | or                  byte ptr [eax - 1], bh
            //   0d98000700           | or                  eax, 0x70098

        $sequence_2 = { 0000 ae 045c ff4d40 ff08 40 0430 }
            // n = 7, score = 200
            //   0000                 | add                 byte ptr [eax], al
            //   ae                   | scasb               al, byte ptr es:[edi]
            //   045c                 | add                 al, 0x5c
            //   ff4d40               | dec                 dword ptr [ebp + 0x40]
            //   ff08                 | dec                 dword ptr [eax]
            //   40                   | inc                 eax
            //   0430                 | add                 al, 0x30

        $sequence_3 = { 008a3800cc1c 5e 006c70ff 0808 008f38001b26 001b }
            // n = 6, score = 200
            //   008a3800cc1c         | add                 byte ptr [edx + 0x1ccc0038], cl
            //   5e                   | pop                 esi
            //   006c70ff             | add                 byte ptr [eax + esi*2 - 1], ch
            //   0808                 | or                  byte ptr [eax], cl
            //   008f38001b26         | add                 byte ptr [edi + 0x261b0038], cl
            //   001b                 | add                 byte ptr [ebx], bl

        $sequence_4 = { 0000 00a1cc004400 0bc0 7402 }
            // n = 4, score = 200
            //   0000                 | add                 byte ptr [eax], al
            //   00a1cc004400         | add                 byte ptr [ecx + 0x4400cc], ah
            //   0bc0                 | or                  eax, eax
            //   7402                 | je                  4

        $sequence_5 = { 40 0430 ff0a 4c 000c00 }
            // n = 5, score = 200
            //   40                   | inc                 eax
            //   0430                 | add                 al, 0x30
            //   ff0a                 | dec                 dword ptr [edx]
            //   4c                   | dec                 esp
            //   000c00               | add                 byte ptr [eax + eax], cl

        $sequence_6 = { 250004003c 6c 70ff 0808 }
            // n = 4, score = 200
            //   250004003c           | and                 eax, 0x3c000400
            //   6c                   | insb                byte ptr es:[edi], dx
            //   70ff                 | jo                  1
            //   0808                 | or                  byte ptr [eax], cl

        $sequence_7 = { 70ff 0808 008a3800cc1c 5e }
            // n = 4, score = 200
            //   70ff                 | jo                  1
            //   0808                 | or                  byte ptr [eax], cl
            //   008a3800cc1c         | add                 byte ptr [edx + 0x1ccc0038], cl
            //   5e                   | pop                 esi

        $sequence_8 = { f6c401 7407 b901000000 eb02 }
            // n = 4, score = 100
            //   f6c401               | test                ah, 1
            //   7407                 | je                  9
            //   b901000000           | mov                 ecx, 1
            //   eb02                 | jmp                 4

        $sequence_9 = { f6c401 740a c78534ffffff00000000 db45c0 }
            // n = 4, score = 100
            //   f6c401               | test                ah, 1
            //   740a                 | je                  0xc
            //   c78534ffffff00000000     | mov    dword ptr [ebp - 0xcc], 0
            //   db45c0               | fild                dword ptr [ebp - 0x40]

        $sequence_10 = { f6c401 7407 bf01000000 eb02 }
            // n = 4, score = 100
            //   f6c401               | test                ah, 1
            //   7407                 | je                  9
            //   bf01000000           | mov                 edi, 1
            //   eb02                 | jmp                 4

        $sequence_11 = { f6c401 7403 897d98 d945cc }
            // n = 4, score = 100
            //   f6c401               | test                ah, 1
            //   7403                 | je                  5
            //   897d98               | mov                 dword ptr [ebp - 0x68], edi
            //   d945cc               | fld                 dword ptr [ebp - 0x34]

        $sequence_12 = { f6c401 7407 b801000000 eb02 33c0 33d2 }
            // n = 6, score = 100
            //   f6c401               | test                ah, 1
            //   7407                 | je                  9
            //   b801000000           | mov                 eax, 1
            //   eb02                 | jmp                 4
            //   33c0                 | xor                 eax, eax
            //   33d2                 | xor                 edx, edx

        $sequence_13 = { f6c401 740c c7850cfeffff01000000 eb0a }
            // n = 4, score = 100
            //   f6c401               | test                ah, 1
            //   740c                 | je                  0xe
            //   c7850cfeffff01000000     | mov    dword ptr [ebp - 0x1f4], 1
            //   eb0a                 | jmp                 0xc

        $sequence_14 = { f6c401 740c c78514ffffff01000000 eb0a }
            // n = 4, score = 100
            //   f6c401               | test                ah, 1
            //   740c                 | je                  0xe
            //   c78514ffffff01000000     | mov    dword ptr [ebp - 0xec], 1
            //   eb0a                 | jmp                 0xc

        $sequence_15 = { f6c401 7403 895dc0 d901 d85dd8 dfe0 f6c401 }
            // n = 7, score = 100
            //   f6c401               | test                ah, 1
            //   7403                 | je                  5
            //   895dc0               | mov                 dword ptr [ebp - 0x40], ebx
            //   d901                 | fld                 dword ptr [ecx]
            //   d85dd8               | fcomp               dword ptr [ebp - 0x28]
            //   dfe0                 | fnstsw              ax
            //   f6c401               | test                ah, 1

    condition:
        7 of them and filesize < 8560640
}