rule win_atmspitter_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.atmspitter."
        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.atmspitter"
        malpedia_rule_date = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 0f8425020000 68???????? e8???????? b801000000 83c404 8944240c 3bf0 }
            // n = 7, score = 200
            //   0f8425020000         | je                  0x22b
            //   68????????           |                     
            //   e8????????           |                     
            //   b801000000           | mov                 eax, 1
            //   83c404               | add                 esp, 4
            //   8944240c             | mov                 dword ptr [esp + 0xc], eax
            //   3bf0                 | cmp                 esi, eax

        $sequence_1 = { 741e 81e9ddda0000 0f8536010000 68???????? e8???????? 83c404 }
            // n = 6, score = 200
            //   741e                 | je                  0x20
            //   81e9ddda0000         | sub                 ecx, 0xdadd
            //   0f8536010000         | jne                 0x13c
            //   68????????           |                     
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_2 = { 53 8d4c2468 68???????? 51 ff15???????? 68???????? }
            // n = 6, score = 200
            //   53                   | push                ebx
            //   8d4c2468             | lea                 ecx, [esp + 0x68]
            //   68????????           |                     
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   68????????           |                     

        $sequence_3 = { 40 89442428 8d4c2420 8d8424c8000000 51 89442438 }
            // n = 6, score = 200
            //   40                   | inc                 eax
            //   89442428             | mov                 dword ptr [esp + 0x28], eax
            //   8d4c2420             | lea                 ecx, [esp + 0x20]
            //   8d8424c8000000       | lea                 eax, [esp + 0xc8]
            //   51                   | push                ecx
            //   89442438             | mov                 dword ptr [esp + 0x38], eax

        $sequence_4 = { 83e203 83f908 7229 f3a5 ff2495b0774000 8bc7 }
            // n = 6, score = 200
            //   83e203               | and                 edx, 3
            //   83f908               | cmp                 ecx, 8
            //   7229                 | jb                  0x2b
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   ff2495b0774000       | jmp                 dword ptr [edx*4 + 0x4077b0]
            //   8bc7                 | mov                 eax, edi

        $sequence_5 = { 56 e8???????? 8d0445cccd4000 8bc8 2bce 6a03 }
            // n = 6, score = 200
            //   56                   | push                esi
            //   e8????????           |                     
            //   8d0445cccd4000       | lea                 eax, [eax*2 + 0x40cdcc]
            //   8bc8                 | mov                 ecx, eax
            //   2bce                 | sub                 ecx, esi
            //   6a03                 | push                3

        $sequence_6 = { 57 8bc2 c1f805 8b048560da4000 8bfa }
            // n = 5, score = 200
            //   57                   | push                edi
            //   8bc2                 | mov                 eax, edx
            //   c1f805               | sar                 eax, 5
            //   8b048560da4000       | mov                 eax, dword ptr [eax*4 + 0x40da60]
            //   8bfa                 | mov                 edi, edx

        $sequence_7 = { ff15???????? 6a02 6a00 8bf8 6a00 57 ff15???????? }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   6a02                 | push                2
            //   6a00                 | push                0
            //   8bf8                 | mov                 edi, eax
            //   6a00                 | push                0
            //   57                   | push                edi
            //   ff15????????         |                     

        $sequence_8 = { e8???????? 83c408 5d c3 68???????? e8???????? 83c404 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   68????????           |                     
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_9 = { 6bc930 8975e0 8db190c84000 8975e4 }
            // n = 4, score = 200
            //   6bc930               | imul                ecx, ecx, 0x30
            //   8975e0               | mov                 dword ptr [ebp - 0x20], esi
            //   8db190c84000         | lea                 esi, [ecx + 0x40c890]
            //   8975e4               | mov                 dword ptr [ebp - 0x1c], esi

    condition:
        7 of them and filesize < 147456
}