rule win_icondown_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.icondown."
        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.icondown"
        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 = { 83ec24 56 8bf1 89742404 e8???????? c744243000000000 c706???????? }
            // n = 7, score = 200
            //   83ec24               | sub                 esp, 0x24
            //   56                   | push                esi
            //   8bf1                 | mov                 esi, ecx
            //   89742404             | mov                 dword ptr [esp + 4], esi
            //   e8????????           |                     
            //   c744243000000000     | mov                 dword ptr [esp + 0x30], 0
            //   c706????????         |                     

        $sequence_1 = { c74500???????? 8bce c644241c0a e8???????? 8d8e90000000 c644241c09 }
            // n = 6, score = 200
            //   c74500????????       |                     
            //   8bce                 | mov                 ecx, esi
            //   c644241c0a           | mov                 byte ptr [esp + 0x1c], 0xa
            //   e8????????           |                     
            //   8d8e90000000         | lea                 ecx, [esi + 0x90]
            //   c644241c09           | mov                 byte ptr [esp + 0x1c], 9

        $sequence_2 = { e8???????? 83c410 c1e702 53 8b442420 8b8cbf681e4500 50 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   c1e702               | shl                 edi, 2
            //   53                   | push                ebx
            //   8b442420             | mov                 eax, dword ptr [esp + 0x20]
            //   8b8cbf681e4500       | mov                 ecx, dword ptr [edi + edi*4 + 0x451e68]
            //   50                   | push                eax

        $sequence_3 = { 8bf9 8b461c 50 ff15???????? 85c0 7407 }
            // n = 6, score = 200
            //   8bf9                 | mov                 edi, ecx
            //   8b461c               | mov                 eax, dword ptr [esi + 0x1c]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7407                 | je                  9

        $sequence_4 = { c705????????01000000 50 a3???????? e8???????? 8db67cb34400 bf???????? }
            // n = 6, score = 200
            //   c705????????01000000     |     
            //   50                   | push                eax
            //   a3????????           |                     
            //   e8????????           |                     
            //   8db67cb34400         | lea                 esi, [esi + 0x44b37c]
            //   bf????????           |                     

        $sequence_5 = { 7732 8a4a02 8a5a03 3acb 7728 57 8b38 }
            // n = 7, score = 200
            //   7732                 | ja                  0x34
            //   8a4a02               | mov                 cl, byte ptr [edx + 2]
            //   8a5a03               | mov                 bl, byte ptr [edx + 3]
            //   3acb                 | cmp                 cl, bl
            //   7728                 | ja                  0x2a
            //   57                   | push                edi
            //   8b38                 | mov                 edi, dword ptr [eax]

        $sequence_6 = { e8???????? 83c404 e8???????? e8???????? e8???????? 68???????? e8???????? }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   e8????????           |                     
            //   e8????????           |                     
            //   e8????????           |                     
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_7 = { 8a542420 64892500000000 88442416 88542417 8b01 8d542414 }
            // n = 6, score = 200
            //   8a542420             | mov                 dl, byte ptr [esp + 0x20]
            //   64892500000000       | mov                 dword ptr fs:[0], esp
            //   88442416             | mov                 byte ptr [esp + 0x16], al
            //   88542417             | mov                 byte ptr [esp + 0x17], dl
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   8d542414             | lea                 edx, [esp + 0x14]

        $sequence_8 = { 5b 81c45c0b0000 c3 8b44241c 83f805 0f8721030000 ff2485bc2f4000 }
            // n = 7, score = 200
            //   5b                   | pop                 ebx
            //   81c45c0b0000         | add                 esp, 0xb5c
            //   c3                   | ret                 
            //   8b44241c             | mov                 eax, dword ptr [esp + 0x1c]
            //   83f805               | cmp                 eax, 5
            //   0f8721030000         | ja                  0x327
            //   ff2485bc2f4000       | jmp                 dword ptr [eax*4 + 0x402fbc]

        $sequence_9 = { ff15???????? f7df 8b442434 8b4c2410 1bff c744241c00000000 83e7fc }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   f7df                 | neg                 edi
            //   8b442434             | mov                 eax, dword ptr [esp + 0x34]
            //   8b4c2410             | mov                 ecx, dword ptr [esp + 0x10]
            //   1bff                 | sbb                 edi, edi
            //   c744241c00000000     | mov                 dword ptr [esp + 0x1c], 0
            //   83e7fc               | and                 edi, 0xfffffffc

    condition:
        7 of them and filesize < 5505024
}