rule win_dma_locker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.dma_locker."
        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.dma_locker"
        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 = { 8b5514 8b4510 8b8db4f6ffff 52 50 51 8d95f8f7ffff }
            // n = 7, score = 200
            //   8b5514               | mov                 edx, dword ptr [ebp + 0x14]
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   8b8db4f6ffff         | mov                 ecx, dword ptr [ebp - 0x94c]
            //   52                   | push                edx
            //   50                   | push                eax
            //   51                   | push                ecx
            //   8d95f8f7ffff         | lea                 edx, [ebp - 0x808]

        $sequence_1 = { 83c404 89442420 89bc24b8060000 3bc7 740e 50 e8???????? }
            // n = 7, score = 200
            //   83c404               | add                 esp, 4
            //   89442420             | mov                 dword ptr [esp + 0x20], eax
            //   89bc24b8060000       | mov                 dword ptr [esp + 0x6b8], edi
            //   3bc7                 | cmp                 eax, edi
            //   740e                 | je                  0x10
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_2 = { 833d????????00 0f84ef730000 83ec08 0fae5c2404 8b442404 25807f0000 3d801f0000 }
            // n = 7, score = 200
            //   833d????????00       |                     
            //   0f84ef730000         | je                  0x73f5
            //   83ec08               | sub                 esp, 8
            //   0fae5c2404           | stmxcsr             dword ptr [esp + 4]
            //   8b442404             | mov                 eax, dword ptr [esp + 4]
            //   25807f0000           | and                 eax, 0x7f80
            //   3d801f0000           | cmp                 eax, 0x1f80

        $sequence_3 = { 3255fc 8816 8a55fb 8ac2 }
            // n = 4, score = 200
            //   3255fc               | xor                 dl, byte ptr [ebp - 4]
            //   8816                 | mov                 byte ptr [esi], dl
            //   8a55fb               | mov                 dl, byte ptr [ebp - 5]
            //   8ac2                 | mov                 al, dl

        $sequence_4 = { 57 8bf1 d1ee bfffff0f00 2bfe }
            // n = 5, score = 200
            //   57                   | push                edi
            //   8bf1                 | mov                 esi, ecx
            //   d1ee                 | shr                 esi, 1
            //   bfffff0f00           | mov                 edi, 0xfffff
            //   2bfe                 | sub                 edi, esi

        $sequence_5 = { 68???????? 68???????? 6a00 ffd3 6a00 6a41 }
            // n = 6, score = 200
            //   68????????           |                     
            //   68????????           |                     
            //   6a00                 | push                0
            //   ffd3                 | call                ebx
            //   6a00                 | push                0
            //   6a41                 | push                0x41

        $sequence_6 = { 8b742418 6a01 56 e8???????? 8b7620 b967000000 }
            // n = 6, score = 200
            //   8b742418             | mov                 esi, dword ptr [esp + 0x18]
            //   6a01                 | push                1
            //   56                   | push                esi
            //   e8????????           |                     
            //   8b7620               | mov                 esi, dword ptr [esi + 0x20]
            //   b967000000           | mov                 ecx, 0x67

        $sequence_7 = { 57 e8???????? 8b4338 8b4b1c }
            // n = 4, score = 200
            //   57                   | push                edi
            //   e8????????           |                     
            //   8b4338               | mov                 eax, dword ptr [ebx + 0x38]
            //   8b4b1c               | mov                 ecx, dword ptr [ebx + 0x1c]

        $sequence_8 = { 53 56 57 68???????? 50 898558feffff e8???????? }
            // n = 7, score = 200
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   68????????           |                     
            //   50                   | push                eax
            //   898558feffff         | mov                 dword ptr [ebp - 0x1a8], eax
            //   e8????????           |                     

        $sequence_9 = { 6a0f 6896000000 6876020000 68be000000 }
            // n = 4, score = 200
            //   6a0f                 | push                0xf
            //   6896000000           | push                0x96
            //   6876020000           | push                0x276
            //   68be000000           | push                0xbe

    condition:
        7 of them and filesize < 532480
}