rule win_lightlesscan_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.lightlesscan."
        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.lightlesscan"
        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 = { 48894c2428 488d8d10040000 488d15fcd80400 48894c2420 488b4c2450 4533c0 ffd0 }
            // n = 7, score = 100
            //   48894c2428           | call                eax
            //   488d8d10040000       | dec                 eax
            //   488d15fcd80400       | lea                 ecx, [0x1bfa0]
            //   48894c2420           | dec                 ecx
            //   488b4c2450           | or                  eax, 0xffffffff
            //   4533c0               | mov                 edx, 0x80
            //   ffd0                 | dec                 eax

        $sequence_1 = { 33d2 41b806020000 6689bd90010000 e8???????? 488d8da2030000 33d2 41b806020000 }
            // n = 7, score = 100
            //   33d2                 | inc                 ecx
            //   41b806020000         | push                esp
            //   6689bd90010000       | dec                 eax
            //   e8????????           |                     
            //   488d8da2030000       | sub                 esp, 0xd10
            //   33d2                 | dec                 eax
            //   41b806020000         | mov                 dword ptr [esp + 0x18], ebp

        $sequence_2 = { 488bcb ff15???????? 488d15d4670400 41b802000000 498bcc e8???????? 4c8d0517ce0400 }
            // n = 7, score = 100
            //   488bcb               | mov                 ecx, esp
            //   ff15????????         |                     
            //   488d15d4670400       | dec                 eax
            //   41b802000000         | lea                 edx, [esp + 0x50]
            //   498bcc               | call                dword ptr [eax + 0x38]
            //   e8????????           |                     
            //   4c8d0517ce0400       | cmp                 dword ptr [esp + 0x50], 0

        $sequence_3 = { 90 0f1045c0 0f298590000000 f20f104dd0 f20f118da0000000 b918000000 e8???????? }
            // n = 7, score = 100
            //   90                   | mov                 ecx, dword ptr [esi]
            //   0f1045c0             | mov                 dword ptr [esp + 0x78], 0x6c6c642e
            //   0f298590000000       | mov                 byte ptr [esp + 0x7c], 0
            //   f20f104dd0           | mov                 dword ptr [ebp + 0xa8], 0x756a6441
            //   f20f118da0000000     | mov                 dword ptr [ebp + 0xac], 0x6f547473
            //   b918000000           | mov                 dword ptr [ebp + 0xb0], 0x506e656b
            //   e8????????           |                     

        $sequence_4 = { 4983c002 48ffc9 75dd 4983e802 33c0 66418900 8d4101 }
            // n = 7, score = 100
            //   4983c002             | dec                 ecx
            //   48ffc9               | mov                 ecx, esp
            //   75dd                 | dec                 eax
            //   4983e802             | lea                 edx, [0x48e35]
            //   33c0                 | inc                 ecx
            //   66418900             | mov                 eax, 2
            //   8d4101               | dec                 ecx

        $sequence_5 = { 49ffc8 75e7 448bcf 4c8d1d79370600 85db 742b }
            // n = 6, score = 100
            //   49ffc8               | mov                 dword ptr [esp + 0x48], 0x656c64
            //   75e7                 | mov                 dword ptr [ebp - 0x50], 0x64616f4c
            //   448bcf               | mov                 dword ptr [ebp - 0x4c], 0x7262694c
            //   4c8d1d79370600       | mov                 dword ptr [ebp - 0x48], 0x41797261
            //   85db                 | mov                 dword ptr [esp + 0x44], 0x1f4
            //   742b                 | mov                 dword ptr [esp + 0x40], 0x190

        $sequence_6 = { 41b802000000 488bce 48c744242000000000 ffd0 488d0dcf800400 e8???????? 4533c9 }
            // n = 7, score = 100
            //   41b802000000         | mov                 dword ptr [eax], edi
            //   488bce               | inc                 ebx
            //   48c744242000000000     | lea    eax, [ebp + ebp]
            //   ffd0                 | mov                 dword ptr [edi], eax
            //   488d0dcf800400       | dec                 ecx
            //   e8????????           |                     
            //   4533c9               | mov                 eax, esi

        $sequence_7 = { c745f040000000 e8???????? 488d4df0 ffd0 488b4df8 488d95b0060000 48c1e914 }
            // n = 7, score = 100
            //   c745f040000000       | mov                 edx, 0x80
            //   e8????????           |                     
            //   488d4df0             | dec                 eax
            //   ffd0                 | lea                 ecx, [0x6a1dc]
            //   488b4df8             | call                eax
            //   488d95b0060000       | je                  0x885
            //   48c1e914             | nop                 word ptr [eax + eax]

        $sequence_8 = { 488d442478 4d8be8 488bf2 c744243000000000 4889442428 458d4101 33d2 }
            // n = 7, score = 100
            //   488d442478           | dec                 esp
            //   4d8be8               | mov                 dword ptr [esp + 0x58], ebx
            //   488bf2               | dec                 esp
            //   c744243000000000     | mov                 dword ptr [esp + 0x60], ebx
            //   4889442428           | dec                 esp
            //   458d4101             | mov                 dword ptr [esp + 0x48], ebx
            //   33d2                 | mov                 dword ptr [esp + 0x48], 1

        $sequence_9 = { 488bf0 b807452ec2 f7eb 448d2c13 41c1fd10 418bcd c1e91f }
            // n = 7, score = 100
            //   488bf0               | call                eax
            //   b807452ec2           | dec                 esp
            //   f7eb                 | lea                 eax, [ebp + 0x7a0]
            //   448d2c13             | dec                 eax
            //   41c1fd10             | lea                 edx, [0x5880e]
            //   418bcd               | dec                 eax
            //   c1e91f               | lea                 ecx, [esp + 0x60]

    condition:
        7 of them and filesize < 1399808
}