rule win_brbbot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.brbbot."
        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.brbbot"
        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 = { 48f7d1 48ffc9 483bd9 7304 }
            // n = 4, score = 100
            //   48f7d1               | dec                 eax
            //   48ffc9               | mov                 ecx, dword ptr [eax + 0x18]
            //   483bd9               | dec                 eax
            //   7304                 | mov                 eax, dword ptr [ecx]

        $sequence_1 = { 7416 eb0c ba0a000000 4c8d05ce3affff }
            // n = 4, score = 100
            //   7416                 | dec                 eax
            //   eb0c                 | mov                 esi, eax
            //   ba0a000000           | dec                 eax
            //   4c8d05ce3affff       | test                eax, eax

        $sequence_2 = { 498dbe0c030000 f2ae 48f7d1 48ffc9 }
            // n = 4, score = 100
            //   498dbe0c030000       | mov                 ecx, dword ptr [esp + 0x30]
            //   f2ae                 | dec                 eax
            //   48f7d1               | test                ecx, ecx
            //   48ffc9               | dec                 eax

        $sequence_3 = { 48c7c2feffffff 448d4203 e8???????? ba0a000000 4c8d05e23affff 663955d8 }
            // n = 6, score = 100
            //   48c7c2feffffff       | lea                 ecx, [esp + 0x98]
            //   448d4203             | inc                 ecx
            //   e8????????           |                     
            //   ba0a000000           | mov                 ecx, 1
            //   4c8d05e23affff       | xor                 edx, edx
            //   663955d8             | dec                 esp

        $sequence_4 = { 750a bf0e000780 e9???????? 488d442470 }
            // n = 4, score = 100
            //   750a                 | inc                 ecx
            //   bf0e000780           | cmp                 eax, edi
            //   e9????????           |                     
            //   488d442470           | je                  0xa1b

        $sequence_5 = { 85c0 747f 035c2420 4439642478 0f856dffffff }
            // n = 5, score = 100
            //   85c0                 | dec                 eax
            //   747f                 | lea                 eax, [0xdd1b]
            //   035c2420             | jmp                 0x1db
            //   4439642478           | dec                 eax
            //   0f856dffffff         | add                 eax, 0x14

        $sequence_6 = { 488bcd e8???????? 4885c0 7403 448820 ba20000000 }
            // n = 6, score = 100
            //   488bcd               | sar                 esi, 5
            //   e8????????           |                     
            //   4885c0               | dec                 esp
            //   7403                 | lea                 esp, [0x8ae2]
            //   448820               | jae                 0x8d9
            //   ba20000000           | dec                 eax

        $sequence_7 = { 85db 744d 880a 4b8b84f9c05a0100 4103da 48ffc2 }
            // n = 6, score = 100
            //   85db                 | mov                 esi, eax
            //   744d                 | dec                 eax
            //   880a                 | test                eax, eax
            //   4b8b84f9c05a0100     | inc                 ebp
            //   4103da               | mov                 eax, ebp
            //   48ffc2               | mov                 edx, 8

        $sequence_8 = { ff15???????? 488b5c2438 8bf8 85c0 }
            // n = 4, score = 100
            //   ff15????????         |                     
            //   488b5c2438           | dec                 esp
            //   8bf8                 | mov                 esi, dword ptr [ebp + 0x40]
            //   85c0                 | mov                 ebx, eax

        $sequence_9 = { f2ae 48f7d1 4c8d41ff 488d8b04010000 e8???????? 4883c9ff 33c0 }
            // n = 7, score = 100
            //   f2ae                 | dec                 eax
            //   48f7d1               | mov                 edi, ebx
            //   4c8d41ff             | dec                 eax
            //   488d8b04010000       | mov                 esi, ebx
            //   e8????????           |                     
            //   4883c9ff             | dec                 eax
            //   33c0                 | sar                 esi, 5

    condition:
        7 of them and filesize < 198656
}