rule win_lockfile_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.lockfile."
        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.lockfile"
        malpedia_rule_date = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 488d4dd0 e8???????? 4180fe43 742e 418d46bb a8f9 7416 }
            // n = 7, score = 200
            //   488d4dd0             | dec                 eax
            //   e8????????           |                     
            //   4180fe43             | cmp                 eax, 0x1f
            //   742e                 | ja                  0xfc5
            //   418d46bb             | dec                 eax
            //   a8f9                 | mov                 dword ptr [ebp - 0x29], esi
            //   7416                 | dec                 eax

        $sequence_1 = { 488d8d70020000 e8???????? 488d8d70020000 e8???????? ff05???????? eb7a 807c245c2e }
            // n = 7, score = 200
            //   488d8d70020000       | dec                 eax
            //   e8????????           |                     
            //   488d8d70020000       | add                 edx, eax
            //   e8????????           |                     
            //   ff05????????         |                     
            //   eb7a                 | dec                 eax
            //   807c245c2e           | mov                 edi, dword ptr [ebp - 0x10]

        $sequence_2 = { 49f76330 4c8d143b 4c8bca 4c8d0401 498b4348 4c3bc1 }
            // n = 6, score = 200
            //   49f76330             | dec                 eax
            //   4c8d143b             | dec                 ecx
            //   4c8bca               | dec                 eax
            //   4c8d0401             | lea                 eax, [esi*8]
            //   498b4348             | dec                 esp
            //   4c3bc1               | mov                 edi, esi

        $sequence_3 = { 3420 88442450 8b442440 040d 3477 88442451 8b442440 }
            // n = 7, score = 200
            //   3420                 | mov                 eax, dword ptr [eax + edx*8]
            //   88442450             | inc                 esp
            //   8b442440             | mov                 dword ptr [eax + ecx*4], edi
            //   040d                 | and                 ecx, 3
            //   3477                 | inc                 ecx
            //   88442451             | mov                 eax, 5
            //   8b442440             | dec                 eax

        $sequence_4 = { 498d4701 488b542430 eb1b 4885c9 7413 e8???????? 488bf8 }
            // n = 7, score = 200
            //   498d4701             | dec                 eax
            //   488b542430           | cmp                 edi, esi
            //   eb1b                 | setb                cl
            //   4885c9               | dec                 esp
            //   7413                 | cmp                 ebx, ebx
            //   e8????????           |                     
            //   488bf8               | dec                 eax

        $sequence_5 = { c645b851 488bcb c645b954 c645ba48 c645bb50 c645bc4b c645bd4e }
            // n = 7, score = 200
            //   c645b851             | mov                 eax, dword ptr [ebx + 0x38]
            //   488bcb               | dec                 ecx
            //   c645b954             | cmp                 ecx, eax
            //   c645ba48             | dec                 eax
            //   c645bb50             | adc                 edx, 0
            //   c645bc4b             | dec                 esp
            //   c645bd4e             | add                 esp, edx

        $sequence_6 = { 4983d700 48f76768 4f8d343c 488bf2 498d0c00 498b4238 493bc8 }
            // n = 7, score = 200
            //   4983d700             | dec                 ecx
            //   48f76768             | mov                 eax, dword ptr [ebx + 0x48]
            //   4f8d343c             | dec                 ecx
            //   488bf2               | cmp                 ecx, eax
            //   498d0c00             | dec                 eax
            //   498b4238             | adc                 edx, 0
            //   493bc8               | dec                 esp

        $sequence_7 = { 488d05045f0300 488901 488d056a600300 48894108 80795900 7506 e8???????? }
            // n = 7, score = 200
            //   488d05045f0300       | xor                 eax, ecx
            //   488901               | rol                 ebx, 1
            //   488d056a600300       | inc                 ecx
            //   48894108             | xor                 eax, edx
            //   80795900             | inc                 ecx
            //   7506                 | rol                 ebp, 1
            //   e8????????           |                     

        $sequence_8 = { 8d0c1b 4903cf 4c8d8588010000 488d15d0fa0500 e8???????? 0fb68588010000 ffc3 }
            // n = 7, score = 200
            //   8d0c1b               | mov                 ebx, edx
            //   4903cf               | dec                 esp
            //   4c8d8588010000       | mov                 edi, ecx
            //   488d15d0fa0500       | mov                 dword ptr [ebp - 0x49], 0
            //   e8????????           |                     
            //   0fb68588010000       | dec                 eax
            //   ffc3                 | mov                 ecx, dword ptr [ebp + 0x7f]

        $sequence_9 = { 4156 4881eca8000000 488bbc24f0000000 4533f6 488b9424e8000000 4d8bd1 488958e8 }
            // n = 7, score = 200
            //   4156                 | je                  0x170e
            //   4881eca8000000       | mov                 dword ptr [ebp - 0x70], ecx
            //   488bbc24f0000000     | dec                 eax
            //   4533f6               | mov                 dword ptr [eax], ecx
            //   488b9424e8000000     | dec                 esp
            //   4d8bd1               | lea                 eax, [edi - 1]
            //   488958e8             | dec                 eax

    condition:
        7 of them and filesize < 1163264
}