rule win_ranbyus_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.ranbyus."
        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.ranbyus"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 8bec 51 837d0c00 7513 68???????? ff7508 e8???????? }
            // n = 7, score = 1100
            //   8bec                 | mov                 ebp, esp
            //   51                   | push                ecx
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0
            //   7513                 | jne                 0x15
            //   68????????           |                     
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     

        $sequence_1 = { 59 85ff 743e 56 6a01 }
            // n = 5, score = 1100
            //   59                   | pop                 ecx
            //   85ff                 | test                edi, edi
            //   743e                 | je                  0x40
            //   56                   | push                esi
            //   6a01                 | push                1

        $sequence_2 = { e8???????? 8b06 ff743804 e8???????? }
            // n = 4, score = 1100
            //   e8????????           |                     
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   ff743804             | push                dword ptr [eax + edi + 4]
            //   e8????????           |                     

        $sequence_3 = { 750a ff7508 ff760c 6a04 ff16 }
            // n = 5, score = 1100
            //   750a                 | jne                 0xc
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff760c               | push                dword ptr [esi + 0xc]
            //   6a04                 | push                4
            //   ff16                 | call                dword ptr [esi]

        $sequence_4 = { c20400 53 55 6a0c }
            // n = 4, score = 1100
            //   c20400               | ret                 4
            //   53                   | push                ebx
            //   55                   | push                ebp
            //   6a0c                 | push                0xc

        $sequence_5 = { 8b4028 85c0 75f5 c3 33c0 c3 }
            // n = 6, score = 1100
            //   8b4028               | mov                 eax, dword ptr [eax + 0x28]
            //   85c0                 | test                eax, eax
            //   75f5                 | jne                 0xfffffff7
            //   c3                   | ret                 
            //   33c0                 | xor                 eax, eax
            //   c3                   | ret                 

        $sequence_6 = { 56 68???????? 89460c e8???????? 83c414 33c0 5e }
            // n = 7, score = 1100
            //   56                   | push                esi
            //   68????????           |                     
            //   89460c               | mov                 dword ptr [esi + 0xc], eax
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14
            //   33c0                 | xor                 eax, eax
            //   5e                   | pop                 esi

        $sequence_7 = { 57 33ff 85db 7504 }
            // n = 4, score = 1100
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   85db                 | test                ebx, ebx
            //   7504                 | jne                 6

        $sequence_8 = { c3 8b4c2404 33c0 85c9 7501 c3 8b11 }
            // n = 7, score = 1100
            //   c3                   | ret                 
            //   8b4c2404             | mov                 ecx, dword ptr [esp + 4]
            //   33c0                 | xor                 eax, eax
            //   85c9                 | test                ecx, ecx
            //   7501                 | jne                 3
            //   c3                   | ret                 
            //   8b11                 | mov                 edx, dword ptr [ecx]

        $sequence_9 = { 8b442410 894604 8bc6 5e c21000 }
            // n = 5, score = 1100
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]
            //   894604               | mov                 dword ptr [esi + 4], eax
            //   8bc6                 | mov                 eax, esi
            //   5e                   | pop                 esi
            //   c21000               | ret                 0x10

    condition:
        7 of them and filesize < 638976
}