rule win_rugmi_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.rugmi."
        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.rugmi"
        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 = { c705????????48c24600 b001 c3 68???????? e8???????? c70424???????? e8???????? }
            // n = 7, score = 100
            //   c705????????48c24600     |     
            //   b001                 | mov                 al, 1
            //   c3                   | ret                 
            //   68????????           |                     
            //   e8????????           |                     
            //   c70424????????       |                     
            //   e8????????           |                     

        $sequence_1 = { ebf1 33c0 889643020000 8aca 40 888e40020000 399684000000 }
            // n = 7, score = 100
            //   ebf1                 | jmp                 0xfffffff3
            //   33c0                 | xor                 eax, eax
            //   889643020000         | mov                 byte ptr [esi + 0x243], dl
            //   8aca                 | mov                 cl, dl
            //   40                   | inc                 eax
            //   888e40020000         | mov                 byte ptr [esi + 0x240], cl
            //   399684000000         | cmp                 dword ptr [esi + 0x84], edx

        $sequence_2 = { 50 8d45f8 50 ff75f8 ff7360 57 e8???????? }
            // n = 7, score = 100
            //   50                   | push                eax
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   50                   | push                eax
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   ff7360               | push                dword ptr [ebx + 0x60]
            //   57                   | push                edi
            //   e8????????           |                     

        $sequence_3 = { 85c9 0f8483090000 8b7e10 8a1c10 85ff 753e e8???????? }
            // n = 7, score = 100
            //   85c9                 | test                ecx, ecx
            //   0f8483090000         | je                  0x989
            //   8b7e10               | mov                 edi, dword ptr [esi + 0x10]
            //   8a1c10               | mov                 bl, byte ptr [eax + edx]
            //   85ff                 | test                edi, edi
            //   753e                 | jne                 0x40
            //   e8????????           |                     

        $sequence_4 = { 832700 8b82c8040000 394514 0f424514 50 ff7510 }
            // n = 6, score = 100
            //   832700               | and                 dword ptr [edi], 0
            //   8b82c8040000         | mov                 eax, dword ptr [edx + 0x4c8]
            //   394514               | cmp                 dword ptr [ebp + 0x14], eax
            //   0f424514             | cmovb               eax, dword ptr [ebp + 0x14]
            //   50                   | push                eax
            //   ff7510               | push                dword ptr [ebp + 0x10]

        $sequence_5 = { ff730c e8???????? 59 84c0 7404 6a05 eb02 }
            // n = 7, score = 100
            //   ff730c               | push                dword ptr [ebx + 0xc]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   84c0                 | test                al, al
            //   7404                 | je                  6
            //   6a05                 | push                5
            //   eb02                 | jmp                 4

        $sequence_6 = { 8bf0 2bf7 eb09 57 e8???????? 59 8bf0 }
            // n = 7, score = 100
            //   8bf0                 | mov                 esi, eax
            //   2bf7                 | sub                 esi, edi
            //   eb09                 | jmp                 0xb
            //   57                   | push                edi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8bf0                 | mov                 esi, eax

        $sequence_7 = { ff15???????? 59 33c0 e9???????? 898bd0010000 8d0431 8983a8010000 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   59                   | pop                 ecx
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     
            //   898bd0010000         | mov                 dword ptr [ebx + 0x1d0], ecx
            //   8d0431               | lea                 eax, [ecx + esi]
            //   8983a8010000         | mov                 dword ptr [ebx + 0x1a8], eax

        $sequence_8 = { 56 8b7508 57 8b8694090000 8b7e0c 85c0 740a }
            // n = 7, score = 100
            //   56                   | push                esi
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   57                   | push                edi
            //   8b8694090000         | mov                 eax, dword ptr [esi + 0x994]
            //   8b7e0c               | mov                 edi, dword ptr [esi + 0xc]
            //   85c0                 | test                eax, eax
            //   740a                 | je                  0xc

        $sequence_9 = { e8???????? 59 59 85c0 7411 0fb74604 3b4514 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   7411                 | je                  0x13
            //   0fb74604             | movzx               eax, word ptr [esi + 4]
            //   3b4514               | cmp                 eax, dword ptr [ebp + 0x14]

    condition:
        7 of them and filesize < 950272
}