rule win_divergent_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.divergent."
        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.divergent"
        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 = { 8b75fc 85c0 0f8511010000 56 ffd3 40 50 }
            // n = 7, score = 300
            //   8b75fc               | mov                 esi, dword ptr [ebp - 4]
            //   85c0                 | test                eax, eax
            //   0f8511010000         | jne                 0x117
            //   56                   | push                esi
            //   ffd3                 | call                ebx
            //   40                   | inc                 eax
            //   50                   | push                eax

        $sequence_1 = { 8bec 81ec08020000 68???????? ff7508 ff15???????? 8d85f8fdffff }
            // n = 6, score = 300
            //   8bec                 | mov                 ebp, esp
            //   81ec08020000         | sub                 esp, 0x208
            //   68????????           |                     
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff15????????         |                     
            //   8d85f8fdffff         | lea                 eax, [ebp - 0x208]

        $sequence_2 = { 8bcf 8bf3 8975fc 803900 0f84ae000000 }
            // n = 5, score = 300
            //   8bcf                 | mov                 ecx, edi
            //   8bf3                 | mov                 esi, ebx
            //   8975fc               | mov                 dword ptr [ebp - 4], esi
            //   803900               | cmp                 byte ptr [ecx], 0
            //   0f84ae000000         | je                  0xb4

        $sequence_3 = { 24c0 3ac1 756a 0fb60e 83e107 0fb6c3 83e03f }
            // n = 7, score = 300
            //   24c0                 | and                 al, 0xc0
            //   3ac1                 | cmp                 al, cl
            //   756a                 | jne                 0x6c
            //   0fb60e               | movzx               ecx, byte ptr [esi]
            //   83e107               | and                 ecx, 7
            //   0fb6c3               | movzx               eax, bl
            //   83e03f               | and                 eax, 0x3f

        $sequence_4 = { 56 ff15???????? 8b4508 8b4d0c 56 89481c ff15???????? }
            // n = 7, score = 300
            //   56                   | push                esi
            //   ff15????????         |                     
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   56                   | push                esi
            //   89481c               | mov                 dword ptr [eax + 0x1c], ecx
            //   ff15????????         |                     

        $sequence_5 = { 59 85c0 0f848a000000 ff7508 ffd3 50 ff7508 }
            // n = 7, score = 300
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   0f848a000000         | je                  0x90
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ffd3                 | call                ebx
            //   50                   | push                eax
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_6 = { 50 e8???????? 59 6a03 56 e8???????? 59 }
            // n = 7, score = 300
            //   50                   | push                eax
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   6a03                 | push                3
            //   56                   | push                esi
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_7 = { 51 51 f20f110424 ff7510 ff750c ff7508 }
            // n = 6, score = 300
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   f20f110424           | movsd               qword ptr [esp], xmm0
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_8 = { 53 56 33f6 8a8200010000 }
            // n = 4, score = 300
            //   53                   | push                ebx
            //   56                   | push                esi
            //   33f6                 | xor                 esi, esi
            //   8a8200010000         | mov                 al, byte ptr [edx + 0x100]

        $sequence_9 = { e9???????? 55 8bec 83ec1c 56 8b750c }
            // n = 6, score = 300
            //   e9????????           |                     
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   83ec1c               | sub                 esp, 0x1c
            //   56                   | push                esi
            //   8b750c               | mov                 esi, dword ptr [ebp + 0xc]

    condition:
        7 of them and filesize < 212992
}