rule win_solaris_loader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.solaris_loader."
        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.solaris_loader"
        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 = { 4c0f45cd ff15???????? 4533c9 c744242000000000 4533c0 }
            // n = 5, score = 100
            //   4c0f45cd             | lea                 ebx, [esp + 0x8e0]
            //   ff15????????         |                     
            //   4533c9               | inc                 ecx
            //   c744242000000000     | mov                 eax, edi
            //   4533c0               | xor                 edx, edx

        $sequence_1 = { ff15???????? 498bcc ff15???????? 8b15???????? 488d0dbb440000 e8???????? 4533c9 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   498bcc               | mov                 dword ptr [esp + 0x28], eax
            //   ff15????????         |                     
            //   8b15????????         |                     
            //   488d0dbb440000       | dec                 eax
            //   e8????????           |                     
            //   4533c9               | mov                 edx, ebx

        $sequence_2 = { 48c744242800000000 4c8d05c4290000 4533c9 c744242000000000 }
            // n = 4, score = 100
            //   48c744242800000000     | mov    dword ptr [ebp + 0x188], ecx
            //   4c8d05c4290000       | mov                 edi, ebx
            //   4533c9               | mov                 word ptr [esp + eax*2 + 0x30], bx
            //   c744242000000000     | dec                 eax

        $sequence_3 = { 48c7851808000000000000 8bfa c7851008000000000000 4533ff e8???????? 448bf0 85c0 }
            // n = 7, score = 100
            //   48c7851808000000000000     | lea    ecx, [0x47de]
            //   8bfa                 | dec                 eax
            //   c7851008000000000000     | mov    edi, eax
            //   4533ff               | dec                 esp
            //   e8????????           |                     
            //   448bf0               | mov                 edi, eax
            //   85c0                 | dec                 ebp

        $sequence_4 = { 4c8d05766d0000 488d1547750000 498bcf e8???????? 448b0d???????? 4c8d05996f0000 488d1532750000 }
            // n = 7, score = 100
            //   4c8d05766d0000       | test                ebx, ebx
            //   488d1547750000       | je                  0x150c
            //   498bcf               | dec                 esp
            //   e8????????           |                     
            //   448b0d????????       |                     
            //   4c8d05996f0000       | mov                 eax, ebx
            //   488d1532750000       | dec                 eax

        $sequence_5 = { 448b842490000000 ba01000000 488bcf ff15???????? 4885f6 7414 }
            // n = 6, score = 100
            //   448b842490000000     | dec                 eax
            //   ba01000000           | mov                 esi, eax
            //   488bcf               | dec                 eax
            //   ff15????????         |                     
            //   4885f6               | lea                 ecx, [0x4bf6]
            //   7414                 | dec                 eax

        $sequence_6 = { 4183c9ff 44897c2428 4d8bc6 33d2 }
            // n = 4, score = 100
            //   4183c9ff             | xor                 ebx, ebx
            //   44897c2428           | dec                 eax
            //   4d8bc6               | lea                 ecx, [esp + 0x30]
            //   33d2                 | xor                 edx, edx

        $sequence_7 = { b9e9fd0000 488bf8 ff15???????? 83eb01 0f84d0050000 83eb01 }
            // n = 6, score = 100
            //   b9e9fd0000           | dec                 ebp
            //   488bf8               | test                esi, esi
            //   ff15????????         |                     
            //   83eb01               | test                eax, eax
            //   0f84d0050000         | je                  0x133f
            //   83eb01               | inc                 ebp

        $sequence_8 = { 4889442430 e8???????? 8b15???????? 488d0d61780000 4889442438 e8???????? 8b15???????? }
            // n = 7, score = 100
            //   4889442430           | mov                 dword ptr [esp + 8], ebx
            //   e8????????           |                     
            //   8b15????????         |                     
            //   488d0d61780000       | dec                 eax
            //   4889442438           | mov                 dword ptr [esp + 0x10], esi
            //   e8????????           |                     
            //   8b15????????         |                     

        $sequence_9 = { 488bd0 33c9 4c8bf0 ff15???????? 4883f820 7e28 4c8d442460 }
            // n = 7, score = 100
            //   488bd0               | test                esi, esi
            //   33c9                 | je                  0x1048
            //   4c8bf0               | xor                 ebx, ebx
            //   ff15????????         |                     
            //   4883f820             | inc                 ebp
            //   7e28                 | xor                 ecx, ecx
            //   4c8d442460           | dec                 eax

    condition:
        7 of them and filesize < 100352
}