rule win_collection_rat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.collection_rat."
        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.collection_rat"
        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 = { 0fb7cd 66c1f904 4503c7 c0e002 458bce 0ac8 }
            // n = 6, score = 100
            //   0fb7cd               | test                ebx, ebx
            //   66c1f904             | test                ebp, ebp
            //   4503c7               | je                  0xa02
            //   c0e002               | inc                 esp
            //   458bce               | lea                 esp, [ebp - 1]
            //   0ac8                 | dec                 ecx

        $sequence_1 = { 8b5310 488b0b e8???????? 488bd0 83783004 7505 ff4310 }
            // n = 7, score = 100
            //   8b5310               | test                eax, eax
            //   488b0b               | dec                 eax
            //   e8????????           |                     
            //   488bd0               | cmovne              ecx, eax
            //   83783004             | dec                 eax
            //   7505                 | mov                 dword ptr [esp + 0x48], ecx
            //   ff4310               | mov                 ecx, ebp

        $sequence_2 = { b9a0000000 e8???????? b920000000 488bf0 e8???????? 488bd0 488bcb }
            // n = 7, score = 100
            //   b9a0000000           | mov                 dword ptr [esp + 0x38], edi
            //   e8????????           |                     
            //   b920000000           | dec                 eax
            //   488bf0               | mov                 edi, dword ptr [esp + 0xc0]
            //   e8????????           |                     
            //   488bd0               | dec                 eax
            //   488bcb               | mov                 dword ptr [esp + 0x30], edi

        $sequence_3 = { 4c89742450 85c0 7423 8bd0 488b8c2498000000 e8???????? 4889442450 }
            // n = 7, score = 100
            //   4c89742450           | dec                 eax
            //   85c0                 | add                 esp, 0x28
            //   7423                 | inc                 ecx
            //   8bd0                 | cmp                 eax, 7
            //   488b8c2498000000     | ja                  0x60
            //   e8????????           |                     
            //   4889442450           | je                  0x57

        $sequence_4 = { 488b0d???????? 488b5108 488b4a30 488901 8bf3 895c2464 4c8b05???????? }
            // n = 7, score = 100
            //   488b0d????????       |                     
            //   488b5108             | dec                 eax
            //   488b4a30             | mov                 esi, eax
            //   488901               | dec                 eax
            //   8bf3                 | lea                 edx, [0x7519]
            //   895c2464             | dec                 eax
            //   4c8b05????????       |                     

        $sequence_5 = { e8???????? 48894308 33d2 488b05???????? }
            // n = 4, score = 100
            //   e8????????           |                     
            //   48894308             | dec                 esp
            //   33d2                 | lea                 eax, [0x22bd1]
            //   488b05????????       |                     

        $sequence_6 = { e8???????? 8bcb ffd0 488bd8 e8???????? 488bc8 bab9000000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8bcb                 | mov                 ecx, eax
            //   ffd0                 | mov                 edx, 0x99
            //   488bd8               | dec                 ebp
            //   e8????????           |                     
            //   488bc8               | mov                 ecx, dword ptr [ebp]
            //   bab9000000           | dec                 esp

        $sequence_7 = { 488d4d88 e8???????? 488d4d90 e8???????? 488b9c2460010000 }
            // n = 5, score = 100
            //   488d4d88             | dec                 eax
            //   e8????????           |                     
            //   488d4d90             | mov                 dword ptr [ecx + eax], edx
            //   e8????????           |                     
            //   488b9c2460010000     | dec                 eax

        $sequence_8 = { 4c8bc0 448bcf ba10000000 488bce e8???????? eb40 }
            // n = 6, score = 100
            //   4c8bc0               | lea                 ecx, [esp + 0x68]
            //   448bcf               | nop                 
            //   ba10000000           | lea                 ebx, [edi + 0x68]
            //   488bce               | inc                 esp
            //   e8????????           |                     
            //   eb40                 | mov                 eax, edx

        $sequence_9 = { 488b5c2430 4863ce 880429 8d4601 4863c8 8a4711 880429 }
            // n = 7, score = 100
            //   488b5c2430           | dec                 esp
            //   4863ce               | lea                 ecx, [ebx - 4]
            //   880429               | mov                 edx, 5
            //   8d4601               | dec                 eax
            //   4863c8               | lea                 ecx, [esp + 0x30]
            //   8a4711               | dec                 esp
            //   880429               | mov                 eax, eax

    condition:
        7 of them and filesize < 397312
}