rule win_cmsbrute_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.cmsbrute."
        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.cmsbrute"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { eb02 33db 8b9594feffff 8d859cfeffff 50 03f3 8d85e4feffff }
            // n = 7, score = 500
            //   eb02                 | jmp                 4
            //   33db                 | xor                 ebx, ebx
            //   8b9594feffff         | mov                 edx, dword ptr [ebp - 0x16c]
            //   8d859cfeffff         | lea                 eax, [ebp - 0x164]
            //   50                   | push                eax
            //   03f3                 | add                 esi, ebx
            //   8d85e4feffff         | lea                 eax, [ebp - 0x11c]

        $sequence_1 = { e8???????? 85c0 7508 83c8ff 5f 5e 5b }
            // n = 7, score = 500
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7508                 | jne                 0xa
            //   83c8ff               | or                  eax, 0xffffffff
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_2 = { ff37 68???????? e8???????? 8b07 8b7708 83c40c 85c0 }
            // n = 7, score = 500
            //   ff37                 | push                dword ptr [edi]
            //   68????????           |                     
            //   e8????????           |                     
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   8b7708               | mov                 esi, dword ptr [edi + 8]
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax

        $sequence_3 = { dd1c24 e8???????? 59 59 8bd8 e8???????? 85c0 }
            // n = 7, score = 500
            //   dd1c24               | fstp                qword ptr [esp]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   8bd8                 | mov                 ebx, eax
            //   e8????????           |                     
            //   85c0                 | test                eax, eax

        $sequence_4 = { ff75f8 e8???????? 59 33c0 3906 0f95c0 5f }
            // n = 7, score = 500
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   33c0                 | xor                 eax, eax
            //   3906                 | cmp                 dword ptr [esi], eax
            //   0f95c0               | setne               al
            //   5f                   | pop                 edi

        $sequence_5 = { e8???????? 59 85c0 0f854cffffff ff74241c 8b74242c ff74241c }
            // n = 7, score = 500
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   0f854cffffff         | jne                 0xffffff52
            //   ff74241c             | push                dword ptr [esp + 0x1c]
            //   8b74242c             | mov                 esi, dword ptr [esp + 0x2c]
            //   ff74241c             | push                dword ptr [esp + 0x1c]

        $sequence_6 = { ff75d4 e8???????? 8b4dd8 8b4104 8365d400 83c40c 85c0 }
            // n = 7, score = 500
            //   ff75d4               | push                dword ptr [ebp - 0x2c]
            //   e8????????           |                     
            //   8b4dd8               | mov                 ecx, dword ptr [ebp - 0x28]
            //   8b4104               | mov                 eax, dword ptr [ecx + 4]
            //   8365d400             | and                 dword ptr [ebp - 0x2c], 0
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax

        $sequence_7 = { e8???????? eb29 6a00 eb02 6a01 8bc6 e8???????? }
            // n = 7, score = 500
            //   e8????????           |                     
            //   eb29                 | jmp                 0x2b
            //   6a00                 | push                0
            //   eb02                 | jmp                 4
            //   6a01                 | push                1
            //   8bc6                 | mov                 eax, esi
            //   e8????????           |                     

        $sequence_8 = { e8???????? ff75bc 8b75c8 ff75b8 ff75c4 ff7508 e8???????? }
            // n = 7, score = 500
            //   e8????????           |                     
            //   ff75bc               | push                dword ptr [ebp - 0x44]
            //   8b75c8               | mov                 esi, dword ptr [ebp - 0x38]
            //   ff75b8               | push                dword ptr [ebp - 0x48]
            //   ff75c4               | push                dword ptr [ebp - 0x3c]
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     

        $sequence_9 = { ff7604 e8???????? 59 59 85c0 7504 6a03 }
            // n = 7, score = 500
            //   ff7604               | push                dword ptr [esi + 4]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   7504                 | jne                 6
            //   6a03                 | push                3

    condition:
        7 of them and filesize < 5275648
}