rule win_bravonc_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.bravonc."
        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.bravonc"
        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 = { 8b06 50 03f3 e8???????? 8945e8 8b45fc }
            // n = 6, score = 100
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   50                   | push                eax
            //   03f3                 | add                 esi, ebx
            //   e8????????           |                     
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]

        $sequence_1 = { c3 55 8bec b80c4b0000 e8???????? 8d45f4 c745f4004b0000 }
            // n = 7, score = 100
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   b80c4b0000           | mov                 eax, 0x4b0c
            //   e8????????           |                     
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   c745f4004b0000       | mov                 dword ptr [ebp - 0xc], 0x4b00

        $sequence_2 = { e8???????? 807c241800 7507 8bcb e8???????? 8d46f9 85c0 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   807c241800           | cmp                 byte ptr [esp + 0x18], 0
            //   7507                 | jne                 9
            //   8bcb                 | mov                 ecx, ebx
            //   e8????????           |                     
            //   8d46f9               | lea                 eax, [esi - 7]
            //   85c0                 | test                eax, eax

        $sequence_3 = { 234df4 334dfc 03c1 8b8ec0000000 }
            // n = 4, score = 100
            //   234df4               | and                 ecx, dword ptr [ebp - 0xc]
            //   334dfc               | xor                 ecx, dword ptr [ebp - 4]
            //   03c1                 | add                 eax, ecx
            //   8b8ec0000000         | mov                 ecx, dword ptr [esi + 0xc0]

        $sequence_4 = { 8bec b80c4b0000 e8???????? 8d45f4 }
            // n = 4, score = 100
            //   8bec                 | mov                 ebp, esp
            //   b80c4b0000           | mov                 eax, 0x4b0c
            //   e8????????           |                     
            //   8d45f4               | lea                 eax, [ebp - 0xc]

        $sequence_5 = { 33c0 59 8dbd38fdffff 899d34fdffff }
            // n = 4, score = 100
            //   33c0                 | xor                 eax, eax
            //   59                   | pop                 ecx
            //   8dbd38fdffff         | lea                 edi, [ebp - 0x2c8]
            //   899d34fdffff         | mov                 dword ptr [ebp - 0x2cc], ebx

        $sequence_6 = { 8b8ec0000000 034114 8b4dec 8d8401a1ebd96e 8945ec e8???????? 8945f4 }
            // n = 7, score = 100
            //   8b8ec0000000         | mov                 ecx, dword ptr [esi + 0xc0]
            //   034114               | add                 eax, dword ptr [ecx + 0x14]
            //   8b4dec               | mov                 ecx, dword ptr [ebp - 0x14]
            //   8d8401a1ebd96e       | lea                 eax, [ecx + eax + 0x6ed9eba1]
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   e8????????           |                     
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax

        $sequence_7 = { 3bc3 7505 a1???????? 50 ff15???????? 8bf0 }
            // n = 6, score = 100
            //   3bc3                 | cmp                 eax, ebx
            //   7505                 | jne                 7
            //   a1????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax

        $sequence_8 = { 57 895dfc ff75f8 e8???????? 8945f8 }
            // n = 5, score = 100
            //   57                   | push                edi
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   e8????????           |                     
            //   8945f8               | mov                 dword ptr [ebp - 8], eax

        $sequence_9 = { 8d4dd0 e8???????? 834dfcff 8d4de0 e8???????? 6a02 e9???????? }
            // n = 7, score = 100
            //   8d4dd0               | lea                 ecx, [ebp - 0x30]
            //   e8????????           |                     
            //   834dfcff             | or                  dword ptr [ebp - 4], 0xffffffff
            //   8d4de0               | lea                 ecx, [ebp - 0x20]
            //   e8????????           |                     
            //   6a02                 | push                2
            //   e9????????           |                     

    condition:
        7 of them and filesize < 131072
}