rule win_dynowiper_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.dynowiper."
        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.dynowiper"
        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 = { 8d45f0 c745f058f14100 50 e8???????? cc }
            // n = 5, score = 100
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   c745f058f14100       | mov                 dword ptr [ebp - 0x10], 0x41f158
            //   50                   | push                eax
            //   e8????????           |                     
            //   cc                   | int3                

        $sequence_1 = { 59 8b7d08 33db 391cfdc8754200 755c }
            // n = 5, score = 100
            //   59                   | pop                 ecx
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   33db                 | xor                 ebx, ebx
            //   391cfdc8754200       | cmp                 dword ptr [edi*8 + 0x4275c8], ebx
            //   755c                 | jne                 0x5e

        $sequence_2 = { 0f849e000000 660fbec3 c745c807000000 c745c401000000 }
            // n = 4, score = 100
            //   0f849e000000         | je                  0xa4
            //   660fbec3             | movsx               ax, bl
            //   c745c807000000       | mov                 dword ptr [ebp - 0x38], 7
            //   c745c401000000       | mov                 dword ptr [ebp - 0x3c], 1

        $sequence_3 = { ff7508 ff5030 8b4df4 64890d00000000 59 5e 8be5 }
            // n = 7, score = 100
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff5030               | call                dword ptr [eax + 0x30]
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx
            //   59                   | pop                 ecx
            //   5e                   | pop                 esi
            //   8be5                 | mov                 esp, ebp

        $sequence_4 = { 0f4345a4 50 ff15???????? 898520fdffff }
            // n = 4, score = 100
            //   0f4345a4             | cmovae              eax, dword ptr [ebp - 0x5c]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   898520fdffff         | mov                 dword ptr [ebp - 0x2e0], eax

        $sequence_5 = { c1e006 03048d90914200 eb05 b8???????? f640247f }
            // n = 5, score = 100
            //   c1e006               | shl                 eax, 6
            //   03048d90914200       | add                 eax, dword ptr [ecx*4 + 0x429190]
            //   eb05                 | jmp                 7
            //   b8????????           |                     
            //   f640247f             | test                byte ptr [eax + 0x24], 0x7f

        $sequence_6 = { e8???????? 85c0 0f84cb000000 6a0d 68???????? }
            // n = 5, score = 100
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   0f84cb000000         | je                  0xd1
            //   6a0d                 | push                0xd
            //   68????????           |                     

        $sequence_7 = { 59 817e5c18254200 7409 ff765c }
            // n = 4, score = 100
            //   59                   | pop                 ecx
            //   817e5c18254200       | cmp                 dword ptr [esi + 0x5c], 0x422518
            //   7409                 | je                  0xb
            //   ff765c               | push                dword ptr [esi + 0x5c]

        $sequence_8 = { 7476 8b55f4 8b049590914200 f644180448 7423 6a0a }
            // n = 6, score = 100
            //   7476                 | je                  0x78
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]
            //   8b049590914200       | mov                 eax, dword ptr [edx*4 + 0x429190]
            //   f644180448           | test                byte ptr [eax + ebx + 4], 0x48
            //   7423                 | je                  0x25
            //   6a0a                 | push                0xa

        $sequence_9 = { 7478 8810 33ff 8d5001 47 8b048d90914200 }
            // n = 6, score = 100
            //   7478                 | je                  0x7a
            //   8810                 | mov                 byte ptr [eax], dl
            //   33ff                 | xor                 edi, edi
            //   8d5001               | lea                 edx, [eax + 1]
            //   47                   | inc                 edi
            //   8b048d90914200       | mov                 eax, dword ptr [ecx*4 + 0x429190]

    condition:
        7 of them and filesize < 374784
}