rule win_atmitch_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.atmitch."
        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.atmitch"
        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 = { 33c0 6a11 66890f 66895702 }
            // n = 4, score = 100
            //   33c0                 | xor                 eax, eax
            //   6a11                 | push                0x11
            //   66890f               | mov                 word ptr [edi], cx
            //   66895702             | mov                 word ptr [edi + 2], dx

        $sequence_1 = { 8d442410 64a300000000 833d????????00 7f05 }
            // n = 4, score = 100
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   833d????????00       |                     
            //   7f05                 | jg                  7

        $sequence_2 = { 8d4c2430 e8???????? 8d4c2410 c744244800000000 }
            // n = 4, score = 100
            //   8d4c2430             | lea                 ecx, [esp + 0x30]
            //   e8????????           |                     
            //   8d4c2410             | lea                 ecx, [esp + 0x10]
            //   c744244800000000     | mov                 dword ptr [esp + 0x48], 0

        $sequence_3 = { 68???????? 8d4c2418 ff15???????? 85c0 7467 8d9b00000000 }
            // n = 6, score = 100
            //   68????????           |                     
            //   8d4c2418             | lea                 ecx, [esp + 0x18]
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7467                 | je                  0x69
            //   8d9b00000000         | lea                 ebx, [ebx]

        $sequence_4 = { 8b54040c 8d440404 80e206 0fbeca f7d9 1bc9 }
            // n = 6, score = 100
            //   8b54040c             | mov                 edx, dword ptr [esp + eax + 0xc]
            //   8d440404             | lea                 eax, [esp + eax + 4]
            //   80e206               | and                 dl, 6
            //   0fbeca               | movsx               ecx, dl
            //   f7d9                 | neg                 ecx
            //   1bc9                 | sbb                 ecx, ecx

        $sequence_5 = { 8b10 8bc8 8b4270 ffd0 }
            // n = 4, score = 100
            //   8b10                 | mov                 edx, dword ptr [eax]
            //   8bc8                 | mov                 ecx, eax
            //   8b4270               | mov                 eax, dword ptr [edx + 0x70]
            //   ffd0                 | call                eax

        $sequence_6 = { 8b0d???????? 8d442414 50 51 b9???????? e8???????? }
            // n = 6, score = 100
            //   8b0d????????         |                     
            //   8d442414             | lea                 eax, [esp + 0x14]
            //   50                   | push                eax
            //   51                   | push                ecx
            //   b9????????           |                     
            //   e8????????           |                     

        $sequence_7 = { e8???????? 83c408 8d4c241c ff15???????? 8d4c2414 ff15???????? }
            // n = 6, score = 100
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8d4c241c             | lea                 ecx, [esp + 0x1c]
            //   ff15????????         |                     
            //   8d4c2414             | lea                 ecx, [esp + 0x14]
            //   ff15????????         |                     

        $sequence_8 = { a1???????? 33c4 50 8d442418 64a300000000 833d????????01 }
            // n = 6, score = 100
            //   a1????????           |                     
            //   33c4                 | xor                 eax, esp
            //   50                   | push                eax
            //   8d442418             | lea                 eax, [esp + 0x18]
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   833d????????01       |                     

        $sequence_9 = { 85db 7e85 8b06 8b4804 8a543130 8d0431 }
            // n = 6, score = 100
            //   85db                 | test                ebx, ebx
            //   7e85                 | jle                 0xffffff87
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   8b4804               | mov                 ecx, dword ptr [eax + 4]
            //   8a543130             | mov                 dl, byte ptr [ecx + esi + 0x30]
            //   8d0431               | lea                 eax, [ecx + esi]

    condition:
        7 of them and filesize < 73728
}