rule win_bolek_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.bolek."
        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.bolek"
        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 = { 8af3 66895df8 8bc3 bf00010000 8801 40 41 }
            // n = 7, score = 600
            //   8af3                 | mov                 dh, bl
            //   66895df8             | mov                 word ptr [ebp - 8], bx
            //   8bc3                 | mov                 eax, ebx
            //   bf00010000           | mov                 edi, 0x100
            //   8801                 | mov                 byte ptr [ecx], al
            //   40                   | inc                 eax
            //   41                   | inc                 ecx

        $sequence_1 = { 894c2410 3c3c 7529 68???????? b8f4010000 2bc7 68???????? }
            // n = 7, score = 600
            //   894c2410             | mov                 dword ptr [esp + 0x10], ecx
            //   3c3c                 | cmp                 al, 0x3c
            //   7529                 | jne                 0x2b
            //   68????????           |                     
            //   b8f4010000           | mov                 eax, 0x1f4
            //   2bc7                 | sub                 eax, edi
            //   68????????           |                     

        $sequence_2 = { e8???????? 8bd8 59 59 85db 7e40 ba???????? }
            // n = 7, score = 600
            //   e8????????           |                     
            //   8bd8                 | mov                 ebx, eax
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   85db                 | test                ebx, ebx
            //   7e40                 | jle                 0x42
            //   ba????????           |                     

        $sequence_3 = { ff15???????? 85c0 740b 8b8c24d4000000 8bd6 eb11 0f57c0 }
            // n = 7, score = 600
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   740b                 | je                  0xd
            //   8b8c24d4000000       | mov                 ecx, dword ptr [esp + 0xd4]
            //   8bd6                 | mov                 edx, esi
            //   eb11                 | jmp                 0x13
            //   0f57c0               | xorps               xmm0, xmm0

        $sequence_4 = { 8d7df2 ab 6a02 59 6a06 ab 6a01 }
            // n = 7, score = 600
            //   8d7df2               | lea                 edi, [ebp - 0xe]
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   6a02                 | push                2
            //   59                   | pop                 ecx
            //   6a06                 | push                6
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   6a01                 | push                1

        $sequence_5 = { ff15???????? 83c40c 837dd000 741c 8d8584fdffff 50 8d458c }
            // n = 7, score = 600
            //   ff15????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   837dd000             | cmp                 dword ptr [ebp - 0x30], 0
            //   741c                 | je                  0x1e
            //   8d8584fdffff         | lea                 eax, [ebp - 0x27c]
            //   50                   | push                eax
            //   8d458c               | lea                 eax, [ebp - 0x74]

        $sequence_6 = { ff7508 e8???????? ebbf ff750c ff7508 e8???????? ebb2 }
            // n = 7, score = 600
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   ebbf                 | jmp                 0xffffffc1
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   ebb2                 | jmp                 0xffffffb4

        $sequence_7 = { ff7610 896c242c 894c2428 e8???????? 83c418 85c0 0f8882000000 }
            // n = 7, score = 600
            //   ff7610               | push                dword ptr [esi + 0x10]
            //   896c242c             | mov                 dword ptr [esp + 0x2c], ebp
            //   894c2428             | mov                 dword ptr [esp + 0x28], ecx
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18
            //   85c0                 | test                eax, eax
            //   0f8882000000         | js                  0x88

        $sequence_8 = { c685d8feffffc3 8d95d8feffff c685f8feffff01 8bce e8???????? 5e 8be5 }
            // n = 7, score = 600
            //   c685d8feffffc3       | mov                 byte ptr [ebp - 0x128], 0xc3
            //   8d95d8feffff         | lea                 edx, [ebp - 0x128]
            //   c685f8feffff01       | mov                 byte ptr [ebp - 0x108], 1
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   5e                   | pop                 esi
            //   8be5                 | mov                 esp, ebp

        $sequence_9 = { 8bf8 83c40c 85ff 0f888a000000 8b44240c 39442420 757c }
            // n = 7, score = 600
            //   8bf8                 | mov                 edi, eax
            //   83c40c               | add                 esp, 0xc
            //   85ff                 | test                edi, edi
            //   0f888a000000         | js                  0x90
            //   8b44240c             | mov                 eax, dword ptr [esp + 0xc]
            //   39442420             | cmp                 dword ptr [esp + 0x20], eax
            //   757c                 | jne                 0x7e

    condition:
        7 of them and filesize < 892928
}