rule win_bluelight_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.bluelight."
        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.bluelight"
        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 = { e8???????? 8d8d60f1ffff e8???????? 8d8dd0f0ffff c645fc0b e8???????? eb03 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8d8d60f1ffff         | lea                 ecx, [ebp - 0xea0]
            //   e8????????           |                     
            //   8d8dd0f0ffff         | lea                 ecx, [ebp - 0xf30]
            //   c645fc0b             | mov                 byte ptr [ebp - 4], 0xb
            //   e8????????           |                     
            //   eb03                 | jmp                 5

        $sequence_1 = { e8???????? 99 8bcb 52 50 e8???????? 8bf8 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   99                   | cdq                 
            //   8bcb                 | mov                 ecx, ebx
            //   52                   | push                edx
            //   50                   | push                eax
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax

        $sequence_2 = { f7f1 894630 897b58 33c9 85ff 6a07 58 }
            // n = 7, score = 100
            //   f7f1                 | div                 ecx
            //   894630               | mov                 dword ptr [esi + 0x30], eax
            //   897b58               | mov                 dword ptr [ebx + 0x58], edi
            //   33c9                 | xor                 ecx, ecx
            //   85ff                 | test                edi, edi
            //   6a07                 | push                7
            //   58                   | pop                 eax

        $sequence_3 = { e9???????? 8b442424 8d7e04 8b542418 0d00010000 8b4c242c 50 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   8b442424             | mov                 eax, dword ptr [esp + 0x24]
            //   8d7e04               | lea                 edi, [esi + 4]
            //   8b542418             | mov                 edx, dword ptr [esp + 0x18]
            //   0d00010000           | or                  eax, 0x100
            //   8b4c242c             | mov                 ecx, dword ptr [esp + 0x2c]
            //   50                   | push                eax

        $sequence_4 = { f744243804002000 7407 814b0800000400 33c0 e9???????? 55 8bec }
            // n = 7, score = 100
            //   f744243804002000     | test                dword ptr [esp + 0x38], 0x200004
            //   7407                 | je                  9
            //   814b0800000400       | or                  dword ptr [ebx + 8], 0x40000
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp

        $sequence_5 = { e9???????? f6411808 75f3 8b4d08 0fb64626 394110 75e7 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   f6411808             | test                byte ptr [ecx + 0x18], 8
            //   75f3                 | jne                 0xfffffff5
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   0fb64626             | movzx               eax, byte ptr [esi + 0x26]
            //   394110               | cmp                 dword ptr [ecx + 0x10], eax
            //   75e7                 | jne                 0xffffffe9

        $sequence_6 = { 8b4b10 89410c 807b4900 750c 8b4310 8b400c 8a404d }
            // n = 7, score = 100
            //   8b4b10               | mov                 ecx, dword ptr [ebx + 0x10]
            //   89410c               | mov                 dword ptr [ecx + 0xc], eax
            //   807b4900             | cmp                 byte ptr [ebx + 0x49], 0
            //   750c                 | jne                 0xe
            //   8b4310               | mov                 eax, dword ptr [ebx + 0x10]
            //   8b400c               | mov                 eax, dword ptr [eax + 0xc]
            //   8a404d               | mov                 al, byte ptr [eax + 0x4d]

        $sequence_7 = { eb06 8b8d68ffffff 6a02 58 3bd0 7528 33c0 }
            // n = 7, score = 100
            //   eb06                 | jmp                 8
            //   8b8d68ffffff         | mov                 ecx, dword ptr [ebp - 0x98]
            //   6a02                 | push                2
            //   58                   | pop                 eax
            //   3bd0                 | cmp                 edx, eax
            //   7528                 | jne                 0x2a
            //   33c0                 | xor                 eax, eax

        $sequence_8 = { eb01 46 8a06 24c0 3c80 74f7 85d2 }
            // n = 7, score = 100
            //   eb01                 | jmp                 3
            //   46                   | inc                 esi
            //   8a06                 | mov                 al, byte ptr [esi]
            //   24c0                 | and                 al, 0xc0
            //   3c80                 | cmp                 al, 0x80
            //   74f7                 | je                  0xfffffff9
            //   85d2                 | test                edx, edx

        $sequence_9 = { eb26 f7462400400000 7421 8b4620 85c0 741a 8b5010 }
            // n = 7, score = 100
            //   eb26                 | jmp                 0x28
            //   f7462400400000       | test                dword ptr [esi + 0x24], 0x4000
            //   7421                 | je                  0x23
            //   8b4620               | mov                 eax, dword ptr [esi + 0x20]
            //   85c0                 | test                eax, eax
            //   741a                 | je                  0x1c
            //   8b5010               | mov                 edx, dword ptr [eax + 0x10]

    condition:
        7 of them and filesize < 2191360
}