rule win_screencap_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.screencap."
        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.screencap"
        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 = { 4c8d0d7d98ffff 41f640387f 7528 3bc6 741e 83f8fe 7419 }
            // n = 7, score = 100
            //   4c8d0d7d98ffff       | lea                 eax, [0x74ef]
            //   41f640387f           | inc                 ecx
            //   7528                 | mov                 ecx, 3
            //   3bc6                 | dec                 eax
            //   741e                 | lea                 ecx, [ebp + eax*2 - 0x44]
            //   83f8fe               | dec                 eax
            //   7419                 | mov                 eax, ecx

        $sequence_1 = { 7533 50 e8???????? 50 6864334700 e8???????? }
            // n = 6, score = 100
            //   7533                 | inc                 ecx
            //   50                   | mov                 eax, 0x3ff
            //   e8????????           |                     
            //   50                   | mov                 byte ptr [ebp + 0x7a0], 0
            //   6864334700           | dec                 esp
            //   e8????????           |                     

        $sequence_2 = { 0f85d2000000 81e964334700 8d7c247c d1f9 8d1449 }
            // n = 5, score = 100
            //   0f85d2000000         | movzx               eax, byte ptr [ebp + eax + 0x365c]
            //   81e964334700         | inc                 ecx
            //   8d7c247c             | mov                 ecx, dword ptr [ebp + eax*4 + 0x360c]
            //   d1f9                 | ja                  0x1fa
            //   8d1449               | dec                 eax

        $sequence_3 = { e9???????? 488d1594c60000 e9???????? 488d1554ca0000 e9???????? 498bd7 e9???????? }
            // n = 7, score = 100
            //   e9????????           |                     
            //   488d1594c60000       | je                  0x5d3
            //   e9????????           |                     
            //   488d1554ca0000       | dec                 eax
            //   e9????????           |                     
            //   498bd7               | mov                 dword ptr [edi - 1], eax
            //   e9????????           |                     

        $sequence_4 = { b424 0c10 0000 8d442404 }
            // n = 4, score = 100
            //   b424                 | dec                 eax
            //   0c10                 | lea                 ecx, [ebp + 0x290]
            //   0000                 | dec                 ebp
            //   8d442404             | mov                 eax, edi

        $sequence_5 = { 488d45f0 4533c9 4889442440 488d05b05d0100 4533c0 4889442438 48895c2430 }
            // n = 7, score = 100
            //   488d45f0             | or                  ecx, 0xffffffff
            //   4533c9               | dec                 eax
            //   4889442440           | mov                 dword ptr [esp + 0x270], ebx
            //   488d05b05d0100       | xor                 eax, eax
            //   4533c0               | mov                 al, 1
            //   4889442438           | jmp                 0x503
            //   48895c2430           | mov                 al, byte ptr [esp + 0x13]

        $sequence_6 = { 85c9 0f847b000000 488d05c3430100 c70001000000 4883c008 }
            // n = 5, score = 100
            //   85c9                 | lea                 eax, [esp + 0x40]
            //   0f847b000000         | lea                 edx, [edi + 0x18]
            //   488d05c3430100       | dec                 ebp
            //   c70001000000         | mov                 dword ptr [ebx - 8], esp
            //   4883c008             | dec                 eax

        $sequence_7 = { 0f848e000000 4c8d4c2450 4c8d442448 488d542440 488bc8 }
            // n = 5, score = 100
            //   0f848e000000         | jne                 0x207b
            //   4c8d4c2450           | dec                 eax
            //   4c8d442448           | adc                 eax, 0xb759
            //   488d542440           | dec                 eax
            //   488bc8               | lea                 ecx, [esp + 0x20]

        $sequence_8 = { e8???????? 85c0 790f 488b0d???????? 33d2 ff15???????? }
            // n = 6, score = 100
            //   e8????????           |                     
            //   85c0                 | sub                 esp, 0x28
            //   790f                 | dec                 eax
            //   488b0d????????       |                     
            //   33d2                 | lea                 eax, [0xe82f]
            //   ff15????????         |                     

        $sequence_9 = { 4889442468 4889442458 488d4580 4d8bf9 458be8 4889442450 448bf2 }
            // n = 7, score = 100
            //   4889442468           | imul                eax, eax, 0x1e
            //   4889442458           | add                 ecx, eax
            //   488d4580             | movzx               eax, word ptr [esp + 0x6e]
            //   4d8bf9               | add                 ecx, eax
            //   458be8               | inc                 ecx
            //   4889442450           | cmp                 ecx, ebx
            //   448bf2               | jle                 0xa15

    condition:
        7 of them and filesize < 1391616
}