rule win_bbsrat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.bbsrat."
        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.bbsrat"
        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 = { ffd5 8b442410 3bc3 0f8549ffffff 8b442414 8b35???????? }
            // n = 6, score = 100
            //   ffd5                 | call                ebp
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]
            //   3bc3                 | cmp                 eax, ebx
            //   0f8549ffffff         | jne                 0xffffff4f
            //   8b442414             | mov                 eax, dword ptr [esp + 0x14]
            //   8b35????????         |                     

        $sequence_1 = { 8bec c7451001000000 c7450c01000000 833d????????00 7516 68???????? a1???????? }
            // n = 7, score = 100
            //   8bec                 | mov                 ebp, esp
            //   c7451001000000       | mov                 dword ptr [ebp + 0x10], 1
            //   c7450c01000000       | mov                 dword ptr [ebp + 0xc], 1
            //   833d????????00       |                     
            //   7516                 | jne                 0x18
            //   68????????           |                     
            //   a1????????           |                     

        $sequence_2 = { a3???????? c705????????4a1c0210 c705????????2b130210 c705????????8d120210 c705????????1a120210 c3 8bff }
            // n = 7, score = 100
            //   a3????????           |                     
            //   c705????????4a1c0210     |     
            //   c705????????2b130210     |     
            //   c705????????8d120210     |     
            //   c705????????1a120210     |     
            //   c3                   | ret                 
            //   8bff                 | mov                 edi, edi

        $sequence_3 = { 895c2424 c744240c40000000 895c241c ff15???????? ff15???????? 6a10 56 }
            // n = 7, score = 100
            //   895c2424             | mov                 dword ptr [esp + 0x24], ebx
            //   c744240c40000000     | mov                 dword ptr [esp + 0xc], 0x40
            //   895c241c             | mov                 dword ptr [esp + 0x1c], ebx
            //   ff15????????         |                     
            //   ff15????????         |                     
            //   6a10                 | push                0x10
            //   56                   | push                esi

        $sequence_4 = { 8b442420 50 ff15???????? 56 e8???????? 83c404 b801000000 }
            // n = 7, score = 100
            //   8b442420             | mov                 eax, dword ptr [esp + 0x20]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   b801000000           | mov                 eax, 1

        $sequence_5 = { 85db 7532 e8???????? 33c0 3b7810 7205 e8???????? }
            // n = 7, score = 100
            //   85db                 | test                ebx, ebx
            //   7532                 | jne                 0x34
            //   e8????????           |                     
            //   33c0                 | xor                 eax, eax
            //   3b7810               | cmp                 edi, dword ptr [eax + 0x10]
            //   7205                 | jb                  7
            //   e8????????           |                     

        $sequence_6 = { 8944243c 89442440 8d442420 50 c744242400000000 ff15???????? 8b442420 }
            // n = 7, score = 100
            //   8944243c             | mov                 dword ptr [esp + 0x3c], eax
            //   89442440             | mov                 dword ptr [esp + 0x40], eax
            //   8d442420             | lea                 eax, [esp + 0x20]
            //   50                   | push                eax
            //   c744242400000000     | mov                 dword ptr [esp + 0x24], 0
            //   ff15????????         |                     
            //   8b442420             | mov                 eax, dword ptr [esp + 0x20]

        $sequence_7 = { c7000c000000 33c0 5e 5d c3 ff35???????? e8???????? }
            // n = 7, score = 100
            //   c7000c000000         | mov                 dword ptr [eax], 0xc
            //   33c0                 | xor                 eax, eax
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   ff35????????         |                     
            //   e8????????           |                     

        $sequence_8 = { 8bc7 e8???????? 85db 751a e8???????? 33c0 3b7810 }
            // n = 7, score = 100
            //   8bc7                 | mov                 eax, edi
            //   e8????????           |                     
            //   85db                 | test                ebx, ebx
            //   751a                 | jne                 0x1c
            //   e8????????           |                     
            //   33c0                 | xor                 eax, eax
            //   3b7810               | cmp                 edi, dword ptr [eax + 0x10]

        $sequence_9 = { 83feff 7411 6a10 8d442428 50 56 e8???????? }
            // n = 7, score = 100
            //   83feff               | cmp                 esi, -1
            //   7411                 | je                  0x13
            //   6a10                 | push                0x10
            //   8d442428             | lea                 eax, [esp + 0x28]
            //   50                   | push                eax
            //   56                   | push                esi
            //   e8????????           |                     

    condition:
        7 of them and filesize < 434176
}