rule win_amtsol_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.amtsol."
        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.amtsol"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 58 894590 c7459411000000 395d10 0f8419010000 6a1c 5f }
            // n = 7, score = 100
            //   58                   | pop                 eax
            //   894590               | mov                 dword ptr [ebp - 0x70], eax
            //   c7459411000000       | mov                 dword ptr [ebp - 0x6c], 0x11
            //   395d10               | cmp                 dword ptr [ebp + 0x10], ebx
            //   0f8419010000         | je                  0x11f
            //   6a1c                 | push                0x1c
            //   5f                   | pop                 edi

        $sequence_1 = { 89455c 899d80000000 895d70 895d68 bf02010000 395d70 7560 }
            // n = 7, score = 100
            //   89455c               | mov                 dword ptr [ebp + 0x5c], eax
            //   899d80000000         | mov                 dword ptr [ebp + 0x80], ebx
            //   895d70               | mov                 dword ptr [ebp + 0x70], ebx
            //   895d68               | mov                 dword ptr [ebp + 0x68], ebx
            //   bf02010000           | mov                 edi, 0x102
            //   395d70               | cmp                 dword ptr [ebp + 0x70], ebx
            //   7560                 | jne                 0x62

        $sequence_2 = { 53 56 8b7508 33db 3bf3 0f847f010000 }
            // n = 6, score = 100
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   33db                 | xor                 ebx, ebx
            //   3bf3                 | cmp                 esi, ebx
            //   0f847f010000         | je                  0x185

        $sequence_3 = { 8b54240c 57 0fb701 0fb63a 33f8 81e7ff000000 66c1e808 }
            // n = 7, score = 100
            //   8b54240c             | mov                 edx, dword ptr [esp + 0xc]
            //   57                   | push                edi
            //   0fb701               | movzx               eax, word ptr [ecx]
            //   0fb63a               | movzx               edi, byte ptr [edx]
            //   33f8                 | xor                 edi, eax
            //   81e7ff000000         | and                 edi, 0xff
            //   66c1e808             | shr                 ax, 8

        $sequence_4 = { 899d68ffffff e8???????? 59 50 57 56 bf???????? }
            // n = 7, score = 100
            //   899d68ffffff         | mov                 dword ptr [ebp - 0x98], ebx
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   50                   | push                eax
            //   57                   | push                edi
            //   56                   | push                esi
            //   bf????????           |                     

        $sequence_5 = { e8???????? 59 e8???????? c3 807c240400 56 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   e8????????           |                     
            //   c3                   | ret                 
            //   807c240400           | cmp                 byte ptr [esp + 4], 0
            //   56                   | push                esi

        $sequence_6 = { ffd3 8bf8 85ff 745b 68???????? 57 ff15???????? }
            // n = 7, score = 100
            //   ffd3                 | call                ebx
            //   8bf8                 | mov                 edi, eax
            //   85ff                 | test                edi, edi
            //   745b                 | je                  0x5d
            //   68????????           |                     
            //   57                   | push                edi
            //   ff15????????         |                     

        $sequence_7 = { 50 e8???????? 59 50 ff7604 e8???????? 83c41c }
            // n = 7, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   50                   | push                eax
            //   ff7604               | push                dword ptr [esi + 4]
            //   e8????????           |                     
            //   83c41c               | add                 esp, 0x1c

        $sequence_8 = { 3330 b9ff000000 8bd6 c1ea10 23d1 8b949048040000 }
            // n = 6, score = 100
            //   3330                 | xor                 esi, dword ptr [eax]
            //   b9ff000000           | mov                 ecx, 0xff
            //   8bd6                 | mov                 edx, esi
            //   c1ea10               | shr                 edx, 0x10
            //   23d1                 | and                 edx, ecx
            //   8b949048040000       | mov                 edx, dword ptr [eax + edx*4 + 0x448]

        $sequence_9 = { 3b5d0c 0f872f010000 83c618 3bde 0f8224010000 33f6 }
            // n = 6, score = 100
            //   3b5d0c               | cmp                 ebx, dword ptr [ebp + 0xc]
            //   0f872f010000         | ja                  0x135
            //   83c618               | add                 esi, 0x18
            //   3bde                 | cmp                 ebx, esi
            //   0f8224010000         | jb                  0x12a
            //   33f6                 | xor                 esi, esi

    condition:
        7 of them and filesize < 335872
}