rule win_purelocker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.purelocker."
        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.purelocker"
        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 = { 83e310 21db 0f84af010000 ff742458 8d157a410110 59 e8???????? }
            // n = 7, score = 100
            //   83e310               | and                 ebx, 0x10
            //   21db                 | and                 ebx, ebx
            //   0f84af010000         | je                  0x1b5
            //   ff742458             | push                dword ptr [esp + 0x58]
            //   8d157a410110         | lea                 edx, [0x1001417a]
            //   59                   | pop                 ecx
            //   e8????????           |                     

        $sequence_1 = { c20800 31c0 50 e8???????? 833d????????00 7426 ff35???????? }
            // n = 7, score = 100
            //   c20800               | ret                 8
            //   31c0                 | xor                 eax, eax
            //   50                   | push                eax
            //   e8????????           |                     
            //   833d????????00       |                     
            //   7426                 | je                  0x28
            //   ff35????????         |                     

        $sequence_2 = { ff35???????? 8d051a470110 50 e8???????? 58 8d1540520110 52 }
            // n = 7, score = 100
            //   ff35????????         |                     
            //   8d051a470110         | lea                 eax, [0x1001471a]
            //   50                   | push                eax
            //   e8????????           |                     
            //   58                   | pop                 eax
            //   8d1540520110         | lea                 edx, [0x10015240]
            //   52                   | push                edx

        $sequence_3 = { ff74243c e8???????? 680a000000 e8???????? ffb424a8000000 ffb424a8000000 }
            // n = 6, score = 100
            //   ff74243c             | push                dword ptr [esp + 0x3c]
            //   e8????????           |                     
            //   680a000000           | push                0xa
            //   e8????????           |                     
            //   ffb424a8000000       | push                dword ptr [esp + 0xa8]
            //   ffb424a8000000       | push                dword ptr [esp + 0xa8]

        $sequence_4 = { 56 57 83f816 0f87c2000000 0fb680a0d10010 ff248594d10010 }
            // n = 6, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   83f816               | cmp                 eax, 0x16
            //   0f87c2000000         | ja                  0xc8
            //   0fb680a0d10010       | movzx               eax, byte ptr [eax + 0x1000d1a0]
            //   ff248594d10010       | jmp                 dword ptr [eax*4 + 0x1000d194]

        $sequence_5 = { 50 ff35???????? ff35???????? e8???????? e8???????? 8b15???????? }
            // n = 6, score = 100
            //   50                   | push                eax
            //   ff35????????         |                     
            //   ff35????????         |                     
            //   e8????????           |                     
            //   e8????????           |                     
            //   8b15????????         |                     

        $sequence_6 = { 50 58 894508 c744241c00000000 6821400000 6800000000 }
            // n = 6, score = 100
            //   50                   | push                eax
            //   58                   | pop                 eax
            //   894508               | mov                 dword ptr [ebp + 8], eax
            //   c744241c00000000     | mov                 dword ptr [esp + 0x1c], 0
            //   6821400000           | push                0x4021
            //   6800000000           | push                0

        $sequence_7 = { eb22 8d6c2464 c74504ffffffff c74500feffffff 8d4500 c7400400000000 c70000000000 }
            // n = 7, score = 100
            //   eb22                 | jmp                 0x24
            //   8d6c2464             | lea                 ebp, [esp + 0x64]
            //   c74504ffffffff       | mov                 dword ptr [ebp + 4], 0xffffffff
            //   c74500feffffff       | mov                 dword ptr [ebp], 0xfffffffe
            //   8d4500               | lea                 eax, [ebp]
            //   c7400400000000       | mov                 dword ptr [eax + 4], 0
            //   c70000000000         | mov                 dword ptr [eax], 0

        $sequence_8 = { 8d1546430110 52 e8???????? 8b542428 52 e8???????? 8d151a520110 }
            // n = 7, score = 100
            //   8d1546430110         | lea                 edx, [0x10014346]
            //   52                   | push                edx
            //   e8????????           |                     
            //   8b542428             | mov                 edx, dword ptr [esp + 0x28]
            //   52                   | push                edx
            //   e8????????           |                     
            //   8d151a520110         | lea                 edx, [0x1001521a]

        $sequence_9 = { e8???????? a3???????? 8b1d???????? 21db 7513 681a38d10b ff74242c }
            // n = 7, score = 100
            //   e8????????           |                     
            //   a3????????           |                     
            //   8b1d????????         |                     
            //   21db                 | and                 ebx, ebx
            //   7513                 | jne                 0x15
            //   681a38d10b           | push                0xbd1381a
            //   ff74242c             | push                dword ptr [esp + 0x2c]

    condition:
        7 of them and filesize < 193536
}