rule win_gopuram_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.gopuram."
        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.gopuram"
        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 = { e8???????? ba04000000 498bcf 8bd8 e8???????? 33c0 4c8d059dae0600 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   ba04000000           | dec                 esp
            //   498bcf               | lea                 eax, [0x6a4ed]
            //   8bd8                 | mov                 edx, ebx
            //   e8????????           |                     
            //   33c0                 | dec                 eax
            //   4c8d059dae0600       | mov                 ecx, eax

        $sequence_1 = { e8???????? 488d151cba0700 488bc8 e8???????? 488bd3 488bc8 e8???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   488d151cba0700       | mov                 eax, esp
            //   488bc8               | dec                 eax
            //   e8????????           |                     
            //   488bd3               | mov                 edi, eax
            //   488bc8               | dec                 eax
            //   e8????????           |                     

        $sequence_2 = { 8bf8 85c0 0f84ae010000 488b06 488bce ff90c0000000 488b0d???????? }
            // n = 7, score = 100
            //   8bf8                 | lea                 edx, [0x80444]
            //   85c0                 | dec                 eax
            //   0f84ae010000         | mov                 ecx, eax
            //   488b06               | dec                 eax
            //   488bce               | lea                 edx, [ebp + 0x1fb0]
            //   ff90c0000000         | dec                 eax
            //   488b0d????????       |                     

        $sequence_3 = { ff9080010000 4c8d05866f0700 41b97c060000 8bd7 488bc8 e8???????? 8bf8 }
            // n = 7, score = 100
            //   ff9080010000         | test                cl, 1
            //   4c8d05866f0700       | je                  0xe44
            //   41b97c060000         | inc                 ecx
            //   8bd7                 | dec                 eax
            //   488bc8               | add                 eax, 8
            //   e8????????           |                     
            //   8bf8                 | cmp                 ecx, 7

        $sequence_4 = { c705????????f4060780 c705????????03400080 c705????????f4060780 c705????????09000380 418bc5 443b77fc 7505 }
            // n = 7, score = 100
            //   c705????????f4060780     |     
            //   c705????????03400080     |     
            //   c705????????f4060780     |     
            //   c705????????09000380     |     
            //   418bc5               | mov                 ebx, dword ptr [ebx + 0x20]
            //   443b77fc             | dec                 ecx
            //   7505                 | mov                 ebp, dword ptr [ebx + 0x28]

        $sequence_5 = { ffc0 8bc8 4803c9 ff15???????? 488bf8 4885c0 0f84fd2d0000 }
            // n = 7, score = 100
            //   ffc0                 | je                  0x1e7
            //   8bc8                 | dec                 ecx
            //   4803c9               | mov                 eax, dword ptr [esi + 0x10]
            //   ff15????????         |                     
            //   488bf8               | dec                 eax
            //   4885c0               | mov                 ebx, dword ptr [esp + 0xb8]
            //   0f84fd2d0000         | xor                 ecx, ecx

        $sequence_6 = { 8b4708 894114 8b470c 894118 448bfb 49c1e705 4d03fe }
            // n = 7, score = 100
            //   8b4708               | test                eax, eax
            //   894114               | jne                 0x1172
            //   8b470c               | inc                 esp
            //   894118               | lea                 eax, [eax + 1]
            //   448bfb               | mov                 byte ptr [esp + 0x28], 0
            //   49c1e705             | mov                 byte ptr [esp + 0x20], 0
            //   4d03fe               | test                eax, eax

        $sequence_7 = { 85ed 746c 8b0d???????? 4084ce 7544 0bce c705????????f4060780 }
            // n = 7, score = 100
            //   85ed                 | ret                 
            //   746c                 | mov                 eax, 1
            //   8b0d????????         |                     
            //   4084ce               | dec                 eax
            //   7544                 | mov                 dword ptr [esi], ecx
            //   0bce                 | dec                 eax
            //   c705????????f4060780     |     

        $sequence_8 = { b9b3000000 eb4b b9b2000000 eb44 b9ab000000 eb3d b9ad000000 }
            // n = 7, score = 100
            //   b9b3000000           | test                byte ptr [edi + 0x18], 0x40
            //   eb4b                 | test                eax, eax
            //   b9b2000000           | jns                 0x1fb0
            //   eb44                 | dec                 ecx
            //   b9ab000000           | mov                 ecx, esi
            //   eb3d                 | dec                 ebp
            //   b9ad000000           | mov                 esi, esp

        $sequence_9 = { 8987e4000000 8b86e8000000 8987e8000000 8b86ec000000 488b5c2430 488b6c2438 8987ec000000 }
            // n = 7, score = 100
            //   8987e4000000         | je                  0x1da4
            //   8b86e8000000         | nop                 word ptr [eax + eax]
            //   8987e8000000         | mov                 edi, 0x80004005
            //   8b86ec000000         | dec                 eax
            //   488b5c2430           | mov                 edx, dword ptr [esp + 0x68]
            //   488b6c2438           | dec                 eax
            //   8987ec000000         | mov                 ecx, dword ptr [ebx + 0x20]

    condition:
        7 of them and filesize < 1591296
}