rule win_boaxxe_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.boaxxe."
        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.boaxxe"
        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 = { 8b5df0 8b5b08 4b 2bd9 8918 41 83c004 }
            // n = 7, score = 100
            //   8b5df0               | mov                 ebx, dword ptr [ebp - 0x10]
            //   8b5b08               | mov                 ebx, dword ptr [ebx + 8]
            //   4b                   | dec                 ebx
            //   2bd9                 | sub                 ebx, ecx
            //   8918                 | mov                 dword ptr [eax], ebx
            //   41                   | inc                 ecx
            //   83c004               | add                 eax, 4

        $sequence_1 = { 755d 8d45e4 e8???????? 66837de616 7322 8d55e0 66b86700 }
            // n = 7, score = 100
            //   755d                 | jne                 0x5f
            //   8d45e4               | lea                 eax, [ebp - 0x1c]
            //   e8????????           |                     
            //   66837de616           | cmp                 word ptr [ebp - 0x1a], 0x16
            //   7322                 | jae                 0x24
            //   8d55e0               | lea                 edx, [ebp - 0x20]
            //   66b86700             | mov                 ax, 0x67

        $sequence_2 = { 894304 e8???????? dd5b08 9b e8???????? dd5b10 9b }
            // n = 7, score = 100
            //   894304               | mov                 dword ptr [ebx + 4], eax
            //   e8????????           |                     
            //   dd5b08               | fstp                qword ptr [ebx + 8]
            //   9b                   | wait                
            //   e8????????           |                     
            //   dd5b10               | fstp                qword ptr [ebx + 0x10]
            //   9b                   | wait                

        $sequence_3 = { 8b54d108 e8???????? 8d45e4 8b95f0feffff 03d2 8b4df0 8b09 }
            // n = 7, score = 100
            //   8b54d108             | mov                 edx, dword ptr [ecx + edx*8 + 8]
            //   e8????????           |                     
            //   8d45e4               | lea                 eax, [ebp - 0x1c]
            //   8b95f0feffff         | mov                 edx, dword ptr [ebp - 0x110]
            //   03d2                 | add                 edx, edx
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   8b09                 | mov                 ecx, dword ptr [ecx]

        $sequence_4 = { 751d 837df801 750d 8b4508 8b55fc e8???????? eb51 }
            // n = 7, score = 100
            //   751d                 | jne                 0x1f
            //   837df801             | cmp                 dword ptr [ebp - 8], 1
            //   750d                 | jne                 0xf
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   e8????????           |                     
            //   eb51                 | jmp                 0x53

        $sequence_5 = { b9???????? 8b55f4 e8???????? 8b45e8 e8???????? 50 8b45f4 }
            // n = 7, score = 100
            //   b9????????           |                     
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]
            //   e8????????           |                     
            //   8b45e8               | mov                 eax, dword ptr [ebp - 0x18]
            //   e8????????           |                     
            //   50                   | push                eax
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]

        $sequence_6 = { c744242030000000 8d44245c 8b10 c1ea11 8b08 c1e10f 0bd1 }
            // n = 7, score = 100
            //   c744242030000000     | mov                 dword ptr [esp + 0x20], 0x30
            //   8d44245c             | lea                 eax, [esp + 0x5c]
            //   8b10                 | mov                 edx, dword ptr [eax]
            //   c1ea11               | shr                 edx, 0x11
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   c1e10f               | shl                 ecx, 0xf
            //   0bd1                 | or                  edx, ecx

        $sequence_7 = { 8d55d0 66b8ee02 e8???????? 8b55d0 a1???????? 8b4028 b905000000 }
            // n = 7, score = 100
            //   8d55d0               | lea                 edx, [ebp - 0x30]
            //   66b8ee02             | mov                 ax, 0x2ee
            //   e8????????           |                     
            //   8b55d0               | mov                 edx, dword ptr [ebp - 0x30]
            //   a1????????           |                     
            //   8b4028               | mov                 eax, dword ptr [eax + 0x28]
            //   b905000000           | mov                 ecx, 5

        $sequence_8 = { 64ff30 648920 c645ff00 8bc6 c1e003 2bc6 8b5318 }
            // n = 7, score = 100
            //   64ff30               | push                dword ptr fs:[eax]
            //   648920               | mov                 dword ptr fs:[eax], esp
            //   c645ff00             | mov                 byte ptr [ebp - 1], 0
            //   8bc6                 | mov                 eax, esi
            //   c1e003               | shl                 eax, 3
            //   2bc6                 | sub                 eax, esi
            //   8b5318               | mov                 edx, dword ptr [ebx + 0x18]

        $sequence_9 = { 8b55c0 8d45f8 e8???????? 8d55bc 8b45f8 e8???????? }
            // n = 6, score = 100
            //   8b55c0               | mov                 edx, dword ptr [ebp - 0x40]
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   e8????????           |                     
            //   8d55bc               | lea                 edx, [ebp - 0x44]
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   e8????????           |                     

    condition:
        7 of them and filesize < 1146880
}