rule win_cmsbrute_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "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 = { eb0e ff74240c ff74240c e8???????? 59 59 59 }
            // n = 7, score = 500
            //   eb0e                 | jmp                 0x10
            //   ff74240c             | push                dword ptr [esp + 0xc]
            //   ff74240c             | push                dword ptr [esp + 0xc]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx

        $sequence_1 = { f7d9 1bc9 83c108 394da8 7d05 8b75a8 eb14 }
            // n = 7, score = 500
            //   f7d9                 | neg                 ecx
            //   1bc9                 | sbb                 ecx, ecx
            //   83c108               | add                 ecx, 8
            //   394da8               | cmp                 dword ptr [ebp - 0x58], ecx
            //   7d05                 | jge                 7
            //   8b75a8               | mov                 esi, dword ptr [ebp - 0x58]
            //   eb14                 | jmp                 0x16

        $sequence_2 = { 8bcb e8???????? 59 59 e8???????? 396e04 751e }
            // n = 7, score = 500
            //   8bcb                 | mov                 ecx, ebx
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   e8????????           |                     
            //   396e04               | cmp                 dword ptr [esi + 4], ebp
            //   751e                 | jne                 0x20

        $sequence_3 = { bf???????? 85c0 740f 6895000000 57 6a1e 6a09 }
            // n = 7, score = 500
            //   bf????????           |                     
            //   85c0                 | test                eax, eax
            //   740f                 | je                  0x11
            //   6895000000           | push                0x95
            //   57                   | push                edi
            //   6a1e                 | push                0x1e
            //   6a09                 | push                9

        $sequence_4 = { eb02 33c0 8b742428 8d4c2430 51 50 ff74241c }
            // n = 7, score = 500
            //   eb02                 | jmp                 4
            //   33c0                 | xor                 eax, eax
            //   8b742428             | mov                 esi, dword ptr [esp + 0x28]
            //   8d4c2430             | lea                 ecx, [esp + 0x30]
            //   51                   | push                ecx
            //   50                   | push                eax
            //   ff74241c             | push                dword ptr [esp + 0x1c]

        $sequence_5 = { e9???????? 830e01 ff7704 8b460c e8???????? 59 85c0 }
            // n = 7, score = 500
            //   e9????????           |                     
            //   830e01               | or                  dword ptr [esi], 1
            //   ff7704               | push                dword ptr [edi + 4]
            //   8b460c               | mov                 eax, dword ptr [esi + 0xc]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax

        $sequence_6 = { ff15???????? 59 eb02 33c0 8b4dfc 33cd e8???????? }
            // n = 7, score = 500
            //   ff15????????         |                     
            //   59                   | pop                 ecx
            //   eb02                 | jmp                 4
            //   33c0                 | xor                 eax, eax
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   33cd                 | xor                 ecx, ebp
            //   e8????????           |                     

        $sequence_7 = { eb13 ffb570feffff 68???????? e8???????? 83c410 ffb5a0fdffff 8d8558ffffff }
            // n = 7, score = 500
            //   eb13                 | jmp                 0x15
            //   ffb570feffff         | push                dword ptr [ebp - 0x190]
            //   68????????           |                     
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   ffb5a0fdffff         | push                dword ptr [ebp - 0x260]
            //   8d8558ffffff         | lea                 eax, [ebp - 0xa8]

        $sequence_8 = { eb58 8b4308 85c0 7416 8b4c2414 8b09 8b4904 }
            // n = 7, score = 500
            //   eb58                 | jmp                 0x5a
            //   8b4308               | mov                 eax, dword ptr [ebx + 8]
            //   85c0                 | test                eax, eax
            //   7416                 | je                  0x18
            //   8b4c2414             | mov                 ecx, dword ptr [esp + 0x14]
            //   8b09                 | mov                 ecx, dword ptr [ecx]
            //   8b4904               | mov                 ecx, dword ptr [ecx + 4]

        $sequence_9 = { ff15???????? 59 894310 85c0 750a c785f4fbffff01000000 c785f0fbffff03000000 }
            // n = 7, score = 500
            //   ff15????????         |                     
            //   59                   | pop                 ecx
            //   894310               | mov                 dword ptr [ebx + 0x10], eax
            //   85c0                 | test                eax, eax
            //   750a                 | jne                 0xc
            //   c785f4fbffff01000000     | mov    dword ptr [ebp - 0x40c], 1
            //   c785f0fbffff03000000     | mov    dword ptr [ebp - 0x410], 3

    condition:
        7 of them and filesize < 5275648
}