rule win_bibi_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.bibi."
        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.bibi"
        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 = { 8bda 4c8d05a25a0100 488bf9 488d1538470100 b904000000 e8???????? 8bd3 }
            // n = 7, score = 100
            //   8bda                 | test                eax, eax
            //   4c8d05a25a0100       | test                al, al
            //   488bf9               | jne                 0x1a1
            //   488d1538470100       | dec                 ecx
            //   b904000000           | lea                 ecx, [ebp + 0x28]
            //   e8????????           |                     
            //   8bd3                 | test                eax, eax

        $sequence_1 = { ff15???????? 488d15c0920100 488bcb 488905???????? ff15???????? }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   488d15c0920100       | dec                 esp
            //   488bcb               | mov                 dword ptr [eax + 8], ebp
            //   488905????????       |                     
            //   ff15????????         |                     

        $sequence_2 = { 488d4f20 48837f3808 7204 488b4f20 41b809000000 488d9424f0020000 e8???????? }
            // n = 7, score = 100
            //   488d4f20             | ret                 
            //   48837f3808           | ret                 
            //   7204                 | dec                 eax
            //   488b4f20             | mov                 dword ptr [esp + 8], ebx
            //   41b809000000         | push                ebp
            //   488d9424f0020000     | dec                 eax
            //   e8????????           |                     

        $sequence_3 = { 664489742430 458d4601 488d159c940200 488d4c2430 e8???????? 90 488d542430 }
            // n = 7, score = 100
            //   664489742430         | mov                 dword ptr [esp + 0x1a0], esp
            //   458d4601             | inc                 ebp
            //   488d159c940200       | lea                 eax, [esp + 4]
            //   488d4c2430           | dec                 eax
            //   e8????????           |                     
            //   90                   | lea                 edx, [0x28c84]
            //   488d542430           | dec                 eax

        $sequence_4 = { 49895008 41894020 41f6c204 7427 0fb60a 83e10f 4a0fbe841970390200 }
            // n = 7, score = 100
            //   49895008             | mov                 eax, ebx
            //   41894020             | dec                 eax
            //   41f6c204             | add                 esp, 0x20
            //   7427                 | dec                 eax
            //   0fb60a               | lea                 ecx, [eax + 8]
            //   83e10f               | dec                 eax
            //   4a0fbe841970390200     | mov    edx, edi

        $sequence_5 = { 498bc8 e8???????? 488d059dff0100 48897b38 48c7434007000000 488d4b08 66897b28 }
            // n = 7, score = 100
            //   498bc8               | dec                 eax
            //   e8????????           |                     
            //   488d059dff0100       | lea                 ecx, [ebp - 0x78]
            //   48897b38             | int3                
            //   48c7434007000000     | dec                 eax
            //   488d4b08             | lea                 ecx, [ebp - 0x71]
            //   66897b28             | dec                 ebp

        $sequence_6 = { 428a8c3180390200 4c2bc2 418b50fc d3ea 41895314 488b5c2410 4c2bc7 }
            // n = 7, score = 100
            //   428a8c3180390200     | dec                 eax
            //   4c2bc2               | add                 ecx, eax
            //   418b50fc             | dec                 eax
            //   d3ea                 | inc                 edi
            //   41895314             | dec                 eax
            //   488b5c2410           | inc                 ecx
            //   4c2bc7               | dec                 eax

        $sequence_7 = { 48635708 4c8d3d2c24ffff 48035508 0fb60a 83e10f 4a0fbe843970390200 }
            // n = 6, score = 100
            //   48635708             | mov                 dword ptr [esp + 0x28], eax
            //   4c8d3d2c24ffff       | dec                 eax
            //   48035508             | mov                 dword ptr [esp + 0x20], ecx
            //   0fb60a               | dec                 ecx
            //   83e10f               | mov                 ecx, dword ptr [esp]
            //   4a0fbe843970390200     | inc    ecx

        $sequence_8 = { 488d158a640200 488d4dbf e8???????? 488d4dbf }
            // n = 4, score = 100
            //   488d158a640200       | mov                 ecx, dword ptr [esp + 0x248]
            //   488d4dbf             | dec                 eax
            //   e8????????           |                     
            //   488d4dbf             | test                ecx, ecx

        $sequence_9 = { 41bf01000000 4c89a42498000000 4c89a424a8000000 48c78424b000000007000000 48c78424c802000005000000 }
            // n = 5, score = 100
            //   41bf01000000         | lea                 ecx, [0x15bc8]
            //   4c89a42498000000     | xor                 ecx, ecx
            //   4c89a424a8000000     | inc                 eax
            //   48c78424b000000007000000     | push    ebx
            //   48c78424c802000005000000     | dec    eax

    condition:
        7 of them and filesize < 462848
}